From 9fbc456b75887ee314c339bc1eba7decba79c6c0 Mon Sep 17 00:00:00 2001
From: marius-kilocode <marius@kilocode.ai>
Date: Tue, 23 Jun 2026 20:40:13 +0200
Subject: [PATCH] feat(sandbox): enforce macOS network isolation

---
 .changeset/macos-network-sandbox.md           |   6 +
 .../workflows/check-opencode-annotations.yml  |   3 +
 packages/kilo-sandbox/package.json            |   3 +-
 packages/kilo-sandbox/src/backend.ts          |   9 +-
 packages/kilo-sandbox/src/index.ts            |   1 +
 packages/kilo-sandbox/src/network.ts          |  89 ++++++
 packages/kilo-sandbox/src/seatbelt-base.ts    |   4 +-
 packages/kilo-sandbox/src/seatbelt-network.ts |  12 +
 packages/kilo-sandbox/src/seatbelt.ts         |   8 +-
 packages/kilo-sandbox/test/backend.test.ts    |  53 +++-
 packages/kilo-sandbox/test/network.test.ts    | 117 ++++++++
 .../test/seatbelt-network.test.ts             | 257 ++++++++++++++++++
 .../tests/settings-accessibility.spec.ts      |  29 ++
 .../tests/unit/sandboxing-settings.test.ts    |  14 +
 .../src/components/settings/SandboxingTab.tsx |  43 +++
 .../src/components/settings/Settings.tsx      |  24 +-
 .../src/components/settings/SettingsRow.tsx   |   5 +-
 .../src/components/settings/sandboxing.ts     |   5 +
 .../kilo-vscode/webview-ui/src/i18n/ar.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/br.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/bs.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/da.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/de.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/en.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/es.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/fr.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/it.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/ja.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/ko.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/nl.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/no.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/pl.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/ru.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/th.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/tr.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/uk.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/zh.ts     |   4 +
 .../kilo-vscode/webview-ui/src/i18n/zht.ts    |   4 +
 .../webview-ui/src/stories/StoryProviders.tsx |   8 +-
 .../src/stories/settings.stories.tsx          |  36 +++
 .../webview-ui/src/types/messages/config.ts   |   1 +
 packages/opencode/src/config/config.ts        |   7 +-
 .../opencode/src/kilocode/sandbox/network.ts  |  36 +++
 .../opencode/src/kilocode/sandbox/policy.ts   |  16 +-
 packages/opencode/src/mcp/index.ts            |   7 +-
 packages/opencode/src/session/tools.ts        |  15 +-
 packages/opencode/src/tool/registry.ts        |  22 +-
 .../kilocode/sandbox/config-network.test.ts   |  78 ++++++
 .../test/kilocode/sandbox/http-tools.test.ts  | 132 +++++++++
 .../test/kilocode/sandbox/network.test.ts     | 141 ++++++++++
 .../test/kilocode/sandbox/policy.test.ts      |   9 +
 .../kilocode/sandbox/session-tools.test.ts    |   3 +-
 .../kilocode/sandbox/shell-network.test.ts    | 103 +++++++
 packages/sdk/js/src/v2/gen/types.gen.ts       |   1 +
 packages/sdk/openapi.json                     |   8 +
 script/check-model-tool-network.ts            | 112 ++++++++
 56 files changed, 1463 insertions(+), 34 deletions(-)
 create mode 100644 .changeset/macos-network-sandbox.md
 create mode 100644 packages/kilo-sandbox/src/network.ts
 create mode 100644 packages/kilo-sandbox/src/seatbelt-network.ts
 create mode 100644 packages/kilo-sandbox/test/network.test.ts
 create mode 100644 packages/kilo-sandbox/test/seatbelt-network.test.ts
 create mode 100644 packages/kilo-vscode/tests/unit/sandboxing-settings.test.ts
 create mode 100644 packages/kilo-vscode/webview-ui/src/components/settings/SandboxingTab.tsx
 create mode 100644 packages/kilo-vscode/webview-ui/src/components/settings/sandboxing.ts
 create mode 100644 packages/opencode/src/kilocode/sandbox/network.ts
 create mode 100644 packages/opencode/test/kilocode/sandbox/config-network.test.ts
 create mode 100644 packages/opencode/test/kilocode/sandbox/http-tools.test.ts
 create mode 100644 packages/opencode/test/kilocode/sandbox/network.test.ts
 create mode 100644 packages/opencode/test/kilocode/sandbox/shell-network.test.ts
 create mode 100644 script/check-model-tool-network.ts

diff --git a/.changeset/macos-network-sandbox.md b/.changeset/macos-network-sandbox.md
new file mode 100644
index 0000000000..d36fc0c2c7
--- /dev/null
+++ b/.changeset/macos-network-sandbox.md
@@ -0,0 +1,6 @@
+---
+"@kilocode/cli": minor
+"kilo-code": minor
+---
+
+Block outbound network access from agent commands and in-process HTTP tools with the optional macOS sandbox, with a Sandboxing setting to allow network access when needed.
diff --git a/.github/workflows/check-opencode-annotations.yml b/.github/workflows/check-opencode-annotations.yml
index e30997d848..f494bbb4c8 100644
--- a/.github/workflows/check-opencode-annotations.yml
+++ b/.github/workflows/check-opencode-annotations.yml
@@ -41,6 +41,9 @@ jobs:
       - name: Check Effect Promise facade allowlist
         run: bun run script/check-opencode-promise-facades.ts
 
+      - name: Check model tool network boundary
+        run: bun run script/check-model-tool-network.ts
+
       - name: Check workflow allowlist
         run: bun run script/check-workflows.ts
       # kilocode_change end
diff --git a/packages/kilo-sandbox/package.json b/packages/kilo-sandbox/package.json
index 1d90567afc..2bf4ea60d1 100644
--- a/packages/kilo-sandbox/package.json
+++ b/packages/kilo-sandbox/package.json
@@ -14,7 +14,8 @@
   ],
   "scripts": {
     "typecheck": "tsgo --noEmit",
-    "test": "bun test --timeout 30000"
+    "test": "bun test --timeout 30000",
+    "test:ci": "mkdir -p .artifacts/unit && bun test --timeout 30000 --reporter=junit --reporter-outfile=.artifacts/unit/junit.xml"
   },
   "dependencies": {
     "effect": "catalog:"
diff --git a/packages/kilo-sandbox/src/backend.ts b/packages/kilo-sandbox/src/backend.ts
index 1b46971e1d..74c8564235 100644
--- a/packages/kilo-sandbox/src/backend.ts
+++ b/packages/kilo-sandbox/src/backend.ts
@@ -2,6 +2,7 @@ import { Effect, PlatformError, Scope } from "effect"
 import { ChildProcess } from "effect/unstable/process"
 import { current } from "./context"
 import type { Profile } from "./profile"
+import { assertProcessNetwork, networkEnvironment } from "./network"
 import { seatbelt } from "./seatbelt"
 
 export interface Launch {
@@ -47,9 +48,10 @@ const backend = select()
 function environment(profile: Profile, launch: Launch) {
   const source = { ...launch.environment, ...profile.environment.set }
   const denied = new Set(profile.environment.deny)
-  return Object.fromEntries(
-    Object.entries(source).filter(([key, value]) => value !== undefined && !denied.has(key)),
-  ) as Record<string, string>
+  const entries = Object.entries(source).filter(
+    (entry): entry is [string, string] => entry[1] !== undefined && !denied.has(entry[0]),
+  )
+  return networkEnvironment(profile, Object.fromEntries(entries))
 }
 
 export function prepare(launch: Launch) {
@@ -57,6 +59,7 @@ export function prepare(launch: Launch) {
     const profile = yield* current
     if (!profile) return launch
     const next = { ...launch, environment: environment(profile, launch) }
+    yield* assertProcessNetwork(profile, launch.command)
     if (!backend.support.available) return next
     return yield* backend.prepare(profile, next)
   })
diff --git a/packages/kilo-sandbox/src/index.ts b/packages/kilo-sandbox/src/index.ts
index 2c57b2221b..1484f49443 100644
--- a/packages/kilo-sandbox/src/index.ts
+++ b/packages/kilo-sandbox/src/index.ts
@@ -1,4 +1,5 @@
 export type { Profile } from "./profile"
 export { assertWrite, enabled, run } from "./context"
 export { decorateFileSystem } from "./filesystem"
+export { assertNetwork, decorateHttpClient, httpLayer as networkHttpLayer } from "./network"
 export { prepareCommand } from "./backend"
diff --git a/packages/kilo-sandbox/src/network.ts b/packages/kilo-sandbox/src/network.ts
new file mode 100644
index 0000000000..5cd29117f3
--- /dev/null
+++ b/packages/kilo-sandbox/src/network.ts
@@ -0,0 +1,89 @@
+import { Effect, Layer, PlatformError } from "effect"
+import { HttpClient, HttpClientError, type HttpClientRequest } from "effect/unstable/http"
+import { current } from "./context"
+import type { Profile } from "./profile"
+
+const proxies = new Set([
+  "HTTP_PROXY",
+  "HTTPS_PROXY",
+  "ALL_PROXY",
+  "NO_PROXY",
+  "http_proxy",
+  "https_proxy",
+  "all_proxy",
+  "no_proxy",
+])
+
+function target(value: string) {
+  if (!URL.canParse(value)) return value
+  const url = new URL(value)
+  return url.origin
+}
+
+function denied(value: string, method: string) {
+  return PlatformError.systemError({
+    _tag: "PermissionDenied",
+    module: "Sandbox",
+    method,
+    pathOrDescriptor: target(value),
+    description: "Sandbox denied outbound network access",
+  })
+}
+
+function unsupported(value: string, method: string) {
+  return PlatformError.systemError({
+    _tag: "BadResource",
+    module: "Sandbox",
+    method,
+    pathOrDescriptor: target(value),
+    description: "Sandbox proxy network mode and allowedHosts are not supported",
+  })
+}
+
+function unsupportedProfile(profile: Profile) {
+  return profile.network.mode === "proxy" || profile.network.allowedHosts.length > 0
+}
+
+export function networkEnvironment(profile: Profile, environment: Record<string, string>) {
+  if (profile.network.mode === "allow" && profile.network.allowedHosts.length === 0) return environment
+  return Object.fromEntries(Object.entries(environment).filter(([key]) => !proxies.has(key)))
+}
+
+export function assertProcessNetwork(profile: Profile, command: string) {
+  if (!unsupportedProfile(profile)) return Effect.void
+  return Effect.fail(unsupported(command, "prepareNetwork"))
+}
+
+export function assertNetwork(value: string, method = "network") {
+  return Effect.gen(function* () {
+    const profile = yield* current
+    if (!profile) return
+    if (unsupportedProfile(profile)) yield* Effect.fail(unsupported(value, method))
+    if (profile.network.mode === "allow") return
+    yield* Effect.fail(denied(value, method))
+  })
+}
+
+function requestError(request: HttpClientRequest.HttpClientRequest, description: string) {
+  return new HttpClientError.HttpClientError({
+    reason: new HttpClientError.TransportError({ request, description }),
+  })
+}
+
+function assertRequest(request: HttpClientRequest.HttpClientRequest) {
+  return Effect.gen(function* () {
+    const profile = yield* current
+    if (!profile) return request
+    if (profile.network.mode === "allow" && profile.network.allowedHosts.length === 0) return request
+    const description = unsupportedProfile(profile)
+      ? "Sandbox proxy network mode and allowedHosts are not supported"
+      : "Sandbox denied outbound network access"
+    return yield* Effect.fail(requestError(request, description))
+  })
+}
+
+export function decorateHttpClient(http: HttpClient.HttpClient): HttpClient.HttpClient {
+  return HttpClient.mapRequestEffect(http, assertRequest)
+}
+
+export const httpLayer = Layer.effect(HttpClient.HttpClient, Effect.map(HttpClient.HttpClient, decorateHttpClient))
diff --git a/packages/kilo-sandbox/src/seatbelt-base.ts b/packages/kilo-sandbox/src/seatbelt-base.ts
index 6478064cc3..a439d94611 100644
--- a/packages/kilo-sandbox/src/seatbelt-base.ts
+++ b/packages/kilo-sandbox/src/seatbelt-base.ts
@@ -97,9 +97,7 @@ export const base = `(version 1)
   (local-name "com.apple.cfprefsd.agent"))
 (allow user-preference-read)
 
-; network is not confined by the file-level sandbox; allow it fully
-(allow network-outbound)
-(allow network-inbound)
+; system services required by common command-line runtimes
 (allow system-socket)
 (allow mach-lookup
   (global-name "com.apple.bsd.dirhelper")
diff --git a/packages/kilo-sandbox/src/seatbelt-network.ts b/packages/kilo-sandbox/src/seatbelt-network.ts
new file mode 100644
index 0000000000..3b742d6b88
--- /dev/null
+++ b/packages/kilo-sandbox/src/seatbelt-network.ts
@@ -0,0 +1,12 @@
+import type { Profile } from "./profile"
+
+export function networkPolicy(profile: Profile) {
+  if (profile.network.mode === "allow") {
+    return "; sandbox network mode: allow\n(allow network-outbound)\n(allow network-inbound)"
+  }
+  return [
+    `; sandbox network mode: ${profile.network.mode}`,
+    '(deny network-outbound (with message "Sandbox denied outbound network access"))',
+    "(allow network-inbound)",
+  ].join("\n")
+}
diff --git a/packages/kilo-sandbox/src/seatbelt.ts b/packages/kilo-sandbox/src/seatbelt.ts
index 40b2a7fd2e..2c01b64e06 100644
--- a/packages/kilo-sandbox/src/seatbelt.ts
+++ b/packages/kilo-sandbox/src/seatbelt.ts
@@ -3,6 +3,7 @@ import { Effect } from "effect"
 import type { Backend, Launch, Support } from "./backend"
 import type { PathRule, Profile } from "./profile"
 import { base } from "./seatbelt-base"
+import { networkPolicy } from "./seatbelt-network"
 
 const executable = "/usr/bin/sandbox-exec"
 
@@ -47,7 +48,12 @@ function policy(profile: Profile) {
       ? ""
       : `(allow file-write*\n  (require-all\n    (require-any ${allow.join(" ")})\n    ${[...deny, ...names].join("\n    ")}\n  )\n)`
   return {
-    value: [base, "; reads are not confined by the file-level sandbox\n(allow file-read*)", write].join("\n"),
+    value: [
+      base,
+      networkPolicy(profile),
+      "; reads are not confined by the file-level sandbox\n(allow file-read*)",
+      write,
+    ].join("\n"),
     params,
   }
 }
diff --git a/packages/kilo-sandbox/test/backend.test.ts b/packages/kilo-sandbox/test/backend.test.ts
index 5cd9266800..9646f96a04 100644
--- a/packages/kilo-sandbox/test/backend.test.ts
+++ b/packages/kilo-sandbox/test/backend.test.ts
@@ -1,18 +1,18 @@
 import { describe, expect, test } from "bun:test"
-import { Effect } from "effect"
+import { Effect, Result } from "effect"
 import { backendSupport, prepare, type Launch } from "../src/backend"
 import { run } from "../src/context"
 import type { Profile } from "../src/profile"
 import { generate } from "../src/seatbelt"
 
-function makeProfile(): Profile {
+function makeProfile(mode: Profile["network"]["mode"] = "deny"): Profile {
   return {
     filesystem: {
       allowWrite: [{ path: "/workspace", kind: "subtree" }],
       denyWrite: [{ path: "/workspace/.git", kind: "subtree" }],
       denyNames: [".git"],
     },
-    network: { mode: "deny", allowedHosts: ["example.com"] },
+    network: { mode, allowedHosts: mode === "proxy" ? ["example.com"] : [] },
     environment: { deny: ["DROP", "RESET"], set: { KEEP: "profile", RESET: "removed" } },
   }
 }
@@ -21,7 +21,12 @@ const launch: Launch = {
   command: "/bin/echo",
   args: ["hello"],
   cwd: "/workspace",
-  environment: { KEEP: "launch", DROP: "secret" },
+  environment: {
+    KEEP: "launch",
+    DROP: "secret",
+    HTTPS_PROXY: "http://127.0.0.1:9000",
+    no_proxy: "*",
+  },
 }
 
 describe("sandbox launch preparation", () => {
@@ -33,7 +38,9 @@ describe("sandbox launch preparation", () => {
     expect(policy).toContain('(require-not (subpath (param "DENY_WRITE_0")))')
     expect(policy).toContain('(require-not (regex #"(^|/)\\.git(/|$)"))')
     expect(policy).toContain("(allow file-read*)")
-    expect(policy).toContain("(allow network-outbound)")
+    expect(policy).toContain("sandbox network mode: deny")
+    expect(policy).toContain("(deny network-outbound")
+    expect(policy).not.toContain("(allow network-outbound)")
     expect(policy).toContain("(allow network-inbound)")
     expect(policy).not.toContain("/workspace/.git")
     expect(result.args).toContain("-DALLOW_WRITE_0=/workspace")
@@ -41,6 +48,15 @@ describe("sandbox launch preparation", () => {
     expect(result.args.slice(-3)).toEqual(["--", "/bin/echo", "hello"])
   })
 
+  test("preserves unrestricted networking in allow mode", () => {
+    const result = generate(makeProfile("allow"), launch)
+    const policy = result.args[1]
+    expect(policy).toContain("sandbox network mode: allow")
+    expect(policy).toContain("(allow network-outbound)")
+    expect(policy).toContain("(allow network-inbound)")
+    expect(policy).not.toContain("(deny network-outbound")
+  })
+
   test("places shell commands inside the sandbox backend", () => {
     const result = generate(makeProfile(), { ...launch, command: "echo hello", args: [], shell: "/bin/zsh" })
     expect(result.args.slice(-4)).toEqual(["--", "/bin/zsh", "-c", "echo hello"])
@@ -67,9 +83,36 @@ describe("sandbox launch preparation", () => {
     expect(result.environment?.KEEP).toBe("profile")
     expect(result.environment?.DROP).toBeUndefined()
     expect(result.environment?.RESET).toBeUndefined()
+    expect(result.environment?.HTTPS_PROXY).toBeUndefined()
+    expect(result.environment?.no_proxy).toBeUndefined()
     expect(result.environment?.PATH).toBeUndefined()
   })
 
+  test("fails proxy mode closed before launching a process", async () => {
+    const result = await Effect.runPromise(
+      Effect.scoped(run(makeProfile("proxy"), prepare(launch))).pipe(Effect.result),
+    )
+    expect(Result.isFailure(result)).toBe(true)
+    if (Result.isFailure(result)) {
+      expect(result.failure.reason._tag).toBe("BadResource")
+      expect(result.failure.message).toContain("proxy network mode and allowedHosts are not supported")
+    }
+  })
+
+  test("fails non-empty allowedHosts closed before launching a process", async () => {
+    const input = makeProfile("allow")
+    const result = await Effect.runPromise(
+      Effect.scoped(run({ ...input, network: { mode: "allow", allowedHosts: ["example.com"] } }, prepare(launch))).pipe(
+        Effect.result,
+      ),
+    )
+    expect(Result.isFailure(result)).toBe(true)
+    if (Result.isFailure(result)) {
+      expect(result.failure.reason._tag).toBe("BadResource")
+      expect(result.failure.message).toContain("proxy network mode and allowedHosts are not supported")
+    }
+  })
+
   test("reports backend support with a reason when unavailable", () => {
     expect(typeof backendSupport.available).toBe("boolean")
     if (!backendSupport.available) expect(backendSupport.reason?.length).toBeGreaterThan(0)
diff --git a/packages/kilo-sandbox/test/network.test.ts b/packages/kilo-sandbox/test/network.test.ts
new file mode 100644
index 0000000000..380fdc758f
--- /dev/null
+++ b/packages/kilo-sandbox/test/network.test.ts
@@ -0,0 +1,117 @@
+import { describe, expect, test } from "bun:test"
+import { Effect, Result } from "effect"
+import { FetchHttpClient, HttpClient } from "effect/unstable/http"
+import { run } from "../src/context"
+import { assertNetwork, decorateHttpClient } from "../src/network"
+import type { Profile } from "../src/profile"
+
+function profile(mode: Profile["network"]["mode"]): Profile {
+  return {
+    filesystem: {
+      allowWrite: [{ path: process.cwd(), kind: "subtree" }],
+      denyWrite: [],
+      denyNames: [".git"],
+    },
+    network: { mode, allowedHosts: mode === "proxy" ? ["example.com"] : [] },
+    environment: { deny: [], set: {} },
+  }
+}
+
+function server() {
+  const paths: string[] = []
+  const server = Bun.serve({
+    hostname: "127.0.0.1",
+    port: 0,
+    fetch(request) {
+      const path = new URL(request.url).pathname
+      paths.push(path)
+      return new Response(path)
+    },
+  })
+  return { server, paths }
+}
+
+describe("sandbox in-process network capability", () => {
+  test("keeps concurrent allow, deny, and control-plane requests call-local", async () => {
+    const http = server()
+    try {
+      const effect = Effect.gen(function* () {
+        const raw = yield* HttpClient.HttpClient
+        const guarded = decorateHttpClient(raw)
+        return yield* Effect.all(
+          {
+            denied: run(profile("deny"), guarded.get(new URL("/denied", http.server.url))).pipe(Effect.result),
+            allowed: run(
+              profile("allow"),
+              Effect.flatMap(guarded.get(new URL("/allowed", http.server.url)), (response) => response.text),
+            ),
+            control: run(
+              profile("deny"),
+              Effect.flatMap(raw.get(new URL("/control", http.server.url)), (response) => response.text),
+            ),
+          },
+          { concurrency: "unbounded" },
+        )
+      }).pipe(Effect.provide(FetchHttpClient.layer))
+
+      const result = await Effect.runPromise(effect)
+      expect(Result.isFailure(result.denied)).toBe(true)
+      if (Result.isFailure(result.denied)) {
+        expect(result.denied.failure.message).toContain("Sandbox denied outbound network access")
+      }
+      expect(result.allowed).toBe("/allowed")
+      expect(result.control).toBe("/control")
+      expect(http.paths.sort()).toEqual(["/allowed", "/control"])
+    } finally {
+      await http.server.stop(true)
+    }
+  })
+
+  test("fails closed when allowedHosts is set outside proxy mode", async () => {
+    for (const mode of ["allow", "deny"] as const) {
+      const input = profile(mode)
+      const result = await Effect.runPromise(
+        run(
+          { ...input, network: { mode, allowedHosts: ["example.com"] } },
+          assertNetwork("https://example.com", "testRequest"),
+        ).pipe(Effect.result),
+      )
+      expect(Result.isFailure(result)).toBe(true)
+      if (Result.isFailure(result)) {
+        expect(result.failure.message).toContain("proxy network mode and allowedHosts are not supported")
+      }
+    }
+  })
+
+  test("fails closed with a clear unsupported result for proxy mode", async () => {
+    const http = server()
+    try {
+      const result = await Effect.runPromise(
+        Effect.gen(function* () {
+          const raw = yield* HttpClient.HttpClient
+          const guarded = decorateHttpClient(raw)
+          return yield* Effect.all({
+            capability: run(profile("proxy"), assertNetwork("https://example.com/path", "testRequest")).pipe(
+              Effect.result,
+            ),
+            request: run(profile("proxy"), guarded.get(new URL("/proxy", http.server.url))).pipe(Effect.result),
+          })
+        }).pipe(Effect.provide(FetchHttpClient.layer)),
+      )
+      expect(Result.isFailure(result.capability)).toBe(true)
+      if (Result.isFailure(result.capability)) {
+        expect(result.capability.failure.reason._tag).toBe("BadResource")
+        expect(result.capability.failure.message).toContain("proxy network mode and allowedHosts are not supported")
+        expect(result.capability.failure.message).toContain("https://example.com")
+        expect(result.capability.failure.message).not.toContain("/path")
+      }
+      expect(Result.isFailure(result.request)).toBe(true)
+      if (Result.isFailure(result.request)) {
+        expect(result.request.failure.message).toContain("proxy network mode and allowedHosts are not supported")
+      }
+      expect(http.paths).toEqual([])
+    } finally {
+      await http.server.stop(true)
+    }
+  })
+})
diff --git a/packages/kilo-sandbox/test/seatbelt-network.test.ts b/packages/kilo-sandbox/test/seatbelt-network.test.ts
new file mode 100644
index 0000000000..bb2eb4dead
--- /dev/null
+++ b/packages/kilo-sandbox/test/seatbelt-network.test.ts
@@ -0,0 +1,257 @@
+import { afterEach, describe, expect, test } from "bun:test"
+import { Effect } from "effect"
+import { mkdir, mkdtemp, readFile, rm } from "node:fs/promises"
+import { join } from "node:path"
+import { tmpdir } from "node:os"
+import { prepare, type Launch } from "../src/backend"
+import { run } from "../src/context"
+import type { Profile } from "../src/profile"
+
+const mac = process.platform === "darwin" ? test : test.skip
+const roots: string[] = []
+
+function profile(root: string, mode: Profile["network"]["mode"]): Profile {
+  return {
+    filesystem: {
+      allowWrite: [{ path: root, kind: "subtree" }],
+      denyWrite: [],
+      denyNames: [".protected"],
+    },
+    network: { mode, allowedHosts: [] },
+    environment: { deny: [], set: {} },
+  }
+}
+
+function prepareLaunch(profile: Profile, input: Launch) {
+  return Effect.runPromise(Effect.scoped(run(profile, prepare(input))))
+}
+
+async function launch(profile: Profile, input: Launch) {
+  const target = await prepareLaunch(profile, input)
+  const child = Bun.spawn([target.command, ...target.args], {
+    cwd: target.cwd,
+    env: target.environment,
+    stdout: "pipe",
+    stderr: "pipe",
+  })
+  const [code, stdout, stderr] = await Promise.all([
+    child.exited,
+    new Response(child.stdout).text(),
+    new Response(child.stderr).text(),
+  ])
+  return { code, stdout, stderr }
+}
+
+function server(hostname: string) {
+  let accepted = 0
+  const listener = Bun.listen({
+    hostname,
+    port: 0,
+    socket: {
+      open(socket) {
+        accepted++
+        socket.write("sandbox-tcp-ok")
+        socket.end()
+      },
+      data() {},
+    },
+  })
+  return {
+    listener,
+    accepted: () => accepted,
+  }
+}
+
+function http() {
+  let requests = 0
+  const server = Bun.serve({
+    hostname: "127.0.0.1",
+    port: 0,
+    fetch() {
+      requests++
+      return new Response("sandbox-http-ok")
+    },
+  })
+  return { server, requests: () => requests }
+}
+
+async function root() {
+  const dir = await mkdtemp(join(tmpdir(), "kilo-seatbelt-network-"))
+  roots.push(dir)
+  await mkdir(join(dir, ".protected"))
+  return dir
+}
+
+afterEach(async () => {
+  await Promise.all(roots.splice(0).map((dir) => rm(dir, { recursive: true, force: true })))
+})
+
+describe("macOS Seatbelt network integration", () => {
+  mac("allows a sandboxed child to exchange loopback TCP data in allow mode", async () => {
+    const dir = await root()
+    const tcp = server("127.0.0.1")
+    try {
+      const result = await launch(profile(dir, "allow"), {
+        command: "/usr/bin/nc",
+        args: ["127.0.0.1", String(tcp.listener.port)],
+        cwd: dir,
+      })
+      expect(result.code).toBe(0)
+      expect(result.stdout).toBe("sandbox-tcp-ok")
+      expect(tcp.accepted()).toBe(1)
+    } finally {
+      tcp.listener.stop(true)
+    }
+  })
+
+  mac("allows a sandboxed child to listen for inbound loopback traffic in deny mode", async () => {
+    const dir = await root()
+    const probe = server("127.0.0.1")
+    const port = probe.listener.port
+    probe.listener.stop(true)
+    const target = await prepareLaunch(profile(dir, "deny"), {
+      command: "/usr/bin/nc",
+      args: ["-l", "127.0.0.1", String(port)],
+      cwd: dir,
+    })
+    const child = Bun.spawn([target.command, ...target.args], {
+      cwd: target.cwd,
+      env: target.environment,
+      stdout: "pipe",
+      stderr: "pipe",
+    })
+    const timeout = setTimeout(() => child.kill(), 5_000)
+    try {
+      const connected = await (async () => {
+        for (const _ of Array.from({ length: 100 })) {
+          const socket = await Bun.connect({
+            hostname: "127.0.0.1",
+            port,
+            socket: {
+              open(socket) {
+                socket.write("sandbox-inbound-ok")
+                socket.end()
+              },
+              data() {},
+              error() {},
+            },
+          }).catch(() => undefined)
+          if (socket) return true
+          await Bun.sleep(20)
+        }
+        return false
+      })()
+      const [code, stdout, stderr] = await Promise.all([
+        child.exited,
+        new Response(child.stdout).text(),
+        new Response(child.stderr).text(),
+      ])
+      expect(connected).toBe(true)
+      expect(code).toBe(0)
+      expect(stdout).toBe("sandbox-inbound-ok")
+      expect(stderr).toBe("")
+    } finally {
+      clearTimeout(timeout)
+      child.kill()
+    }
+  })
+
+  mac("denies a sandboxed child loopback TCP connection with a kernel permission error", async () => {
+    const dir = await root()
+    const tcp = server("127.0.0.1")
+    try {
+      const result = await launch(profile(dir, "deny"), {
+        command: "/usr/bin/nc",
+        args: ["-v", "127.0.0.1", String(tcp.listener.port)],
+        cwd: dir,
+      })
+      expect(result.code).not.toBe(0)
+      expect(result.stderr).toContain("Operation not permitted")
+      expect(tcp.accepted()).toBe(0)
+    } finally {
+      tcp.listener.stop(true)
+    }
+  })
+
+  mac("enforces allow and deny modes for child HTTP requests", async () => {
+    const dir = await root()
+    const allowed = http()
+    const denied = http()
+    try {
+      const allow = await launch(profile(dir, "allow"), {
+        command: "/usr/bin/curl",
+        args: ["--noproxy", "*", "-fsS", allowed.server.url.toString()],
+        cwd: dir,
+      })
+      const deny = await launch(profile(dir, "deny"), {
+        command: "/usr/bin/curl",
+        args: ["--noproxy", "*", "-fsS", denied.server.url.toString()],
+        cwd: dir,
+      })
+      expect(allow.code).toBe(0)
+      expect(allow.stdout).toBe("sandbox-http-ok")
+      expect(allowed.requests()).toBe(1)
+      expect(deny.code).not.toBe(0)
+      expect(denied.requests()).toBe(0)
+    } finally {
+      await Promise.all([allowed.server.stop(true), denied.server.stop(true)])
+    }
+  })
+
+  mac("denies hostname and IPv6 loopback forms", async () => {
+    const dir = await root()
+    const ipv4 = server("127.0.0.1")
+    const ipv6 = server("::1")
+    try {
+      const localhost = await launch(profile(dir, "deny"), {
+        command: "/usr/bin/nc",
+        args: ["-v", "localhost", String(ipv4.listener.port)],
+        cwd: dir,
+      })
+      const direct = await launch(profile(dir, "deny"), {
+        command: "/usr/bin/nc",
+        args: ["-v", "::1", String(ipv6.listener.port)],
+        cwd: dir,
+      })
+      expect(localhost.code).not.toBe(0)
+      expect(localhost.stderr).toContain("Operation not permitted")
+      expect(direct.code).not.toBe(0)
+      expect(direct.stderr).toContain("Operation not permitted")
+      expect(ipv4.accepted()).toBe(0)
+      expect(ipv6.accepted()).toBe(0)
+    } finally {
+      ipv4.listener.stop(true)
+      ipv6.listener.stop(true)
+    }
+  })
+
+  for (const mode of ["allow", "deny"] as const) {
+    mac(`preserves filesystem policy in ${mode} network mode`, async () => {
+      const dir = await root()
+      const outside = join(await root(), `${mode}.txt`)
+      const allowed = join(dir, `${mode}.txt`)
+      const blocked = join(dir, ".protected", `${mode}.txt`)
+      const write = await launch(profile(dir, mode), {
+        command: "/bin/sh",
+        args: ["-c", 'printf allowed > "$1"', "sandbox-write", allowed],
+        cwd: dir,
+      })
+      const deny = await launch(profile(dir, mode), {
+        command: "/bin/sh",
+        args: ["-c", 'printf blocked > "$1"', "sandbox-write", blocked],
+        cwd: dir,
+      })
+      const escape = await launch(profile(dir, mode), {
+        command: "/bin/sh",
+        args: ["-c", 'printf blocked > "$1"', "sandbox-write", outside],
+        cwd: dir,
+      })
+      expect(write.code).toBe(0)
+      expect(await readFile(allowed, "utf8")).toBe("allowed")
+      expect(deny.code).not.toBe(0)
+      expect(await Bun.file(blocked).exists()).toBe(false)
+      expect(escape.code).not.toBe(0)
+      expect(await Bun.file(outside).exists()).toBe(false)
+    })
+  }
+})
diff --git a/packages/kilo-vscode/tests/settings-accessibility.spec.ts b/packages/kilo-vscode/tests/settings-accessibility.spec.ts
index e9c93e86e3..d6c26749fa 100644
--- a/packages/kilo-vscode/tests/settings-accessibility.spec.ts
+++ b/packages/kilo-vscode/tests/settings-accessibility.spec.ts
@@ -31,6 +31,7 @@ test.describe("settings tab accessibility", () => {
 
     const tabs = page.getByRole("tab")
     await expect(tabs).toHaveCount(NAMES.length)
+    await expect(page.getByRole("tab", { name: "Sandboxing" })).toHaveCount(0)
     for (const name of NAMES) {
       await expect(page.getByRole("tab", { name, exact: true })).toBeVisible()
     }
@@ -52,4 +53,32 @@ test.describe("settings tab accessibility", () => {
     await expect(models).toHaveAttribute("aria-selected", "true")
     await expect(page.getByRole("tabpanel", { name: "Models" })).toBeVisible()
   })
+
+  test("requires both the internal feature flag and sandbox experiment", async ({ page }) => {
+    await page.setViewportSize({ width: 420, height: 720 })
+    for (const story of ["sandbox-experiment-only", "sandbox-controls-only"]) {
+      await page.goto(`/iframe.html?id=settings--${story}&viewMode=story&globals=${GLOBALS}`, {
+        waitUntil: "load",
+      })
+      await expect(page.getByRole("tab", { name: "Sandboxing" })).toHaveCount(0)
+    }
+  })
+
+  test("shows sandboxing controls when the feature flag and experiment are enabled", async ({ page }) => {
+    await page.setViewportSize({ width: 420, height: 720 })
+    await page.goto(`/iframe.html?id=settings--sandboxing-panel&viewMode=story&globals=${GLOBALS}`, {
+      waitUntil: "load",
+    })
+
+    const tab = page.getByRole("tab", { name: "Sandboxing" })
+    await expect(tab).toBeVisible()
+    await expect(tab).toHaveAttribute("aria-selected", "true")
+    await expect(page.getByRole("tabpanel", { name: "Sandboxing" })).toBeVisible()
+    const network = page.getByRole("switch", { name: "Restrict Network Access" })
+    await expect(network).toHaveAccessibleDescription(/Local MCP servers and plugin hooks run outside this restriction/)
+    await expect(network).toBeChecked()
+    await page.locator('[data-slot="switch-control"]').click()
+    await expect(network).not.toBeChecked()
+    await expect(page.locator(".settings-save-bar")).toBeVisible()
+  })
 })
diff --git a/packages/kilo-vscode/tests/unit/sandboxing-settings.test.ts b/packages/kilo-vscode/tests/unit/sandboxing-settings.test.ts
new file mode 100644
index 0000000000..08ce002d0e
--- /dev/null
+++ b/packages/kilo-vscode/tests/unit/sandboxing-settings.test.ts
@@ -0,0 +1,14 @@
+import { describe, expect, test } from "bun:test"
+import { visible } from "../../webview-ui/src/components/settings/sandboxing"
+
+const features = { indexing: false, sandboxControls: false }
+
+describe("Sandboxing settings visibility", () => {
+  test("requires both the internal feature flag and sandbox experiment", () => {
+    expect(visible(features, {})).toBe(false)
+    expect(visible({ ...features, sandboxControls: true }, {})).toBe(false)
+    expect(visible(features, { experimental: { sandbox: true } })).toBe(false)
+    expect(visible({ ...features, sandboxControls: true }, { experimental: { sandbox: false } })).toBe(false)
+    expect(visible({ ...features, sandboxControls: true }, { experimental: { sandbox: true } })).toBe(true)
+  })
+})
diff --git a/packages/kilo-vscode/webview-ui/src/components/settings/SandboxingTab.tsx b/packages/kilo-vscode/webview-ui/src/components/settings/SandboxingTab.tsx
new file mode 100644
index 0000000000..04aa30a7e5
--- /dev/null
+++ b/packages/kilo-vscode/webview-ui/src/components/settings/SandboxingTab.tsx
@@ -0,0 +1,43 @@
+import { Component, createMemo } from "solid-js"
+import { Card } from "@kilocode/kilo-ui/card"
+import { Switch } from "@kilocode/kilo-ui/switch"
+import { useConfig } from "../../context/config"
+import { useLanguage } from "../../context/language"
+import SettingsRow from "./SettingsRow"
+
+const description = "sandbox-network-description"
+
+const SandboxingTab: Component = () => {
+  const { config, updateConfig } = useConfig()
+  const language = useLanguage()
+  const experimental = createMemo(() => config().experimental ?? {})
+
+  return (
+    <Card>
+      <SettingsRow
+        title={language.t("settings.sandboxing.network.title")}
+        description={language.t("settings.sandboxing.network.description")}
+        descriptionId={description}
+        last
+      >
+        <Switch
+          checked={experimental().sandbox_restrict_network !== false}
+          aria-describedby={description}
+          onChange={(checked) =>
+            updateConfig({
+              experimental: {
+                ...experimental(),
+                sandbox_restrict_network: checked,
+              },
+            })
+          }
+          hideLabel
+        >
+          {language.t("settings.sandboxing.network.title")}
+        </Switch>
+      </SettingsRow>
+    </Card>
+  )
+}
+
+export default SandboxingTab
diff --git a/packages/kilo-vscode/webview-ui/src/components/settings/Settings.tsx b/packages/kilo-vscode/webview-ui/src/components/settings/Settings.tsx
index d4c4027462..2ec4c32d94 100644
--- a/packages/kilo-vscode/webview-ui/src/components/settings/Settings.tsx
+++ b/packages/kilo-vscode/webview-ui/src/components/settings/Settings.tsx
@@ -1,4 +1,4 @@
-import { Component, createSignal, createEffect, on, Show } from "solid-js"
+import { Component, createSignal, createEffect, createMemo, on, Show } from "solid-js"
 import { Icon } from "@kilocode/kilo-ui/icon"
 import { Tabs } from "@kilocode/kilo-ui/tabs"
 import { Button } from "@kilocode/kilo-ui/button"
@@ -23,6 +23,8 @@ import ExperimentalTab from "./ExperimentalTab"
 import LanguageTab from "./LanguageTab"
 import AboutKiloCodeTab from "./AboutKiloCodeTab"
 import IndexingTab from "./IndexingTab"
+import SandboxingTab from "./SandboxingTab"
+import * as Sandboxing from "./sandboxing"
 import { useServer } from "../../context/server"
 import type { MigrationSource } from "../../types/messages"
 
@@ -36,10 +38,11 @@ const Settings: Component<SettingsProps> = (props) => {
   const server = useServer()
   const language = useLanguage()
   const vscode = useVSCode()
-  const { isDirty, saving, saveError, saveConfig, discardConfig, features } = useConfig()
+  const { config, loading, isDirty, saving, saveError, saveConfig, discardConfig, features } = useConfig()
   const session = useSession()
   const [active, setActive] = createSignal(props.tab ?? "models")
   const [errorExpanded, setErrorExpanded] = createSignal(false)
+  const sandboxing = createMemo(() => Sandboxing.visible(features(), config()))
 
   const busyCount = () => Object.values(session.allStatusMap()).filter((s) => s.type === "busy").length
 
@@ -107,6 +110,11 @@ const Settings: Component<SettingsProps> = (props) => {
     onTabChange("providers")
   })
 
+  createEffect(() => {
+    if (loading() || sandboxing() || active() !== "sandboxing") return
+    onTabChange("experimental")
+  })
+
   const onTabChange = (tab: string) => {
     setActive(tab)
     props.onTabChange?.(tab)
@@ -201,6 +209,12 @@ const Settings: Component<SettingsProps> = (props) => {
             <Icon name="settings-gear" />
             <span class="label">{language.t("settings.experimental.title")}</span>
           </Tabs.Trigger>
+          <Show when={sandboxing()}>
+            <Tabs.Trigger value="sandboxing" aria-label={language.t("settings.sandboxing.title")}>
+              <Icon name="shield" />
+              <span class="label">{language.t("settings.sandboxing.title")}</span>
+            </Tabs.Trigger>
+          </Show>
           <Tabs.Trigger value="language" aria-label={language.t("settings.language.title")}>
             <Icon name="speech-bubble" />
             <span class="label">{language.t("settings.language.title")}</span>
@@ -266,6 +280,12 @@ const Settings: Component<SettingsProps> = (props) => {
           <h3>{language.t("settings.experimental.title")}</h3>
           <ExperimentalTab />
         </Tabs.Content>
+        <Show when={sandboxing()}>
+          <Tabs.Content value="sandboxing">
+            <h3>{language.t("settings.sandboxing.title")}</h3>
+            <SandboxingTab />
+          </Tabs.Content>
+        </Show>
         <Tabs.Content value="language">
           <h3>{language.t("settings.language.title")}</h3>
           <LanguageTab />
diff --git a/packages/kilo-vscode/webview-ui/src/components/settings/SettingsRow.tsx b/packages/kilo-vscode/webview-ui/src/components/settings/SettingsRow.tsx
index 5596527526..f913d9426c 100644
--- a/packages/kilo-vscode/webview-ui/src/components/settings/SettingsRow.tsx
+++ b/packages/kilo-vscode/webview-ui/src/components/settings/SettingsRow.tsx
@@ -4,6 +4,7 @@ import { Component, JSX, Show } from "solid-js"
 const SettingsRow: Component<{
   title: string
   description?: string
+  descriptionId?: string
   tag?: () => string | undefined
   last?: boolean
   children: JSX.Element
@@ -32,7 +33,9 @@ const SettingsRow: Component<{
         <Show when={props.tag?.()}>{(tag) => <Tag>{tag()}</Tag>}</Show>
       </div>
       {props.description !== null && props.description !== undefined && (
-        <div data-slot="settings-row-label-subtitle">{props.description}</div>
+        <div id={props.descriptionId} data-slot="settings-row-label-subtitle">
+          {props.description}
+        </div>
       )}
     </div>
     <div data-slot="settings-row-input">{props.children}</div>
diff --git a/packages/kilo-vscode/webview-ui/src/components/settings/sandboxing.ts b/packages/kilo-vscode/webview-ui/src/components/settings/sandboxing.ts
new file mode 100644
index 0000000000..023549e77d
--- /dev/null
+++ b/packages/kilo-vscode/webview-ui/src/components/settings/sandboxing.ts
@@ -0,0 +1,5 @@
+import type { Config, FeatureFlags } from "../../types/messages"
+
+export function visible(features: FeatureFlags, config: Config) {
+  return features.sandboxControls && config.experimental?.sandbox === true
+}
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/ar.ts b/packages/kilo-vscode/webview-ui/src/i18n/ar.ts
index 718be10a2d..b6c5a18655 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/ar.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/ar.ts
@@ -1303,6 +1303,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "اختر نموذج نسخ Kilo Gateway للإدخال الصوتي.",
   "settings.experimental.continueOnDeny.title": "المتابعة عند الرفض",
   "settings.experimental.continueOnDeny.description": "متابعة حلقة الوكيل عند رفض الإذن",
+  "settings.sandboxing.title": "العزل",
+  "settings.sandboxing.network.title": "تقييد الوصول إلى الشبكة",
+  "settings.sandboxing.network.description":
+    "احظر الوصول الصادر إلى الشبكة من الأوامر الصادرة عن النموذج وأدوات HTTP. تعمل خوادم MCP المحلية وخطافات المكونات الإضافية خارج هذا التقييد. تظل حركة مرور استدلال الموفّر والنموذج متاحة.",
   "settings.experimental.mcpTimeout.title": "مهلة MCP (مللي ثانية)",
   "settings.experimental.mcpTimeout.description": "مهلة طلبات خادم MCP بالمللي ثانية",
   "settings.experimental.remote.title": "التحكم Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/br.ts b/packages/kilo-vscode/webview-ui/src/i18n/br.ts
index d4927279f6..78a2294ffd 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/br.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/br.ts
@@ -1336,6 +1336,10 @@ export const dict = {
     "Escolha o modelo de transcrição do Kilo Gateway para entrada de voz.",
   "settings.experimental.continueOnDeny.title": "Continuar ao negar",
   "settings.experimental.continueOnDeny.description": "Continuar o loop do agente quando uma permissão é negada",
+  "settings.sandboxing.title": "Isolamento em sandbox",
+  "settings.sandboxing.network.title": "Restringir acesso à rede",
+  "settings.sandboxing.network.description":
+    "Bloqueie o acesso de saída à rede para comandos originados pelo modelo e ferramentas HTTP. Servidores MCP locais e hooks de plugins são executados fora dessa restrição. O tráfego de inferência de provedores e modelos permanece disponível.",
   "settings.experimental.mcpTimeout.title": "Tempo limite MCP (ms)",
   "settings.experimental.mcpTimeout.description": "Tempo limite para solicitações do servidor MCP em milissegundos",
   "settings.experimental.remote.title": "Controle Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/bs.ts b/packages/kilo-vscode/webview-ui/src/i18n/bs.ts
index c8be77708b..4fb516fcac 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/bs.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/bs.ts
@@ -1334,6 +1334,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "Odaberite Kilo Gateway model za transkripciju za glasovni unos.",
   "settings.experimental.continueOnDeny.title": "Nastavi pri odbijanju",
   "settings.experimental.continueOnDeny.description": "Nastavi petlju agenta kada je dozvola odbijena",
+  "settings.sandboxing.title": "Rad u izoliranom okruženju",
+  "settings.sandboxing.network.title": "Ograniči pristup mreži",
+  "settings.sandboxing.network.description":
+    "Blokiraj odlazni mrežni pristup za naredbe koje potiču od modela i HTTP alate. Lokalni MCP serveri i hookovi dodataka izvršavaju se izvan ovog ograničenja. Saobraćaj za inferenciju pružatelja i modela ostaje dostupan.",
   "settings.experimental.mcpTimeout.title": "MCP istek vremena (ms)",
   "settings.experimental.mcpTimeout.description": "Istek vremena za MCP server zahtjeve u milisekundama",
   "settings.experimental.remote.title": "Remote kontrola",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/da.ts b/packages/kilo-vscode/webview-ui/src/i18n/da.ts
index c7a4449fbd..92ee09fdd3 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/da.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/da.ts
@@ -1328,6 +1328,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "Vælg Kilo Gateway-transskriptionsmodellen til stemmeinput.",
   "settings.experimental.continueOnDeny.title": "Fortsæt ved afvisning",
   "settings.experimental.continueOnDeny.description": "Fortsæt agentløkken, når en tilladelse afvises",
+  "settings.sandboxing.title": "Sandboxing",
+  "settings.sandboxing.network.title": "Begræns netværksadgang",
+  "settings.sandboxing.network.description":
+    "Bloker udgående netværksadgang fra kommandoer, der stammer fra modellen, og HTTP-værktøjer. Lokale MCP-servere og plugin-hooks er ikke underlagt denne begrænsning. Inferenstrafik til udbydere og modeller er fortsat tilgængelig.",
   "settings.experimental.mcpTimeout.title": "MCP-timeout (ms)",
   "settings.experimental.mcpTimeout.description": "Timeout for MCP-serveranmodninger i millisekunder",
   "settings.experimental.remote.title": "Remote-styring",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/de.ts b/packages/kilo-vscode/webview-ui/src/i18n/de.ts
index d66810c269..03441e4f5b 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/de.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/de.ts
@@ -1353,6 +1353,10 @@ export const dict = {
   "settings.experimental.continueOnDeny.title": "Bei Ablehnung fortfahren",
   "settings.experimental.continueOnDeny.description":
     "Agent-Schleife fortsetzen, wenn eine Berechtigung abgelehnt wird",
+  "settings.sandboxing.title": "Sandbox",
+  "settings.sandboxing.network.title": "Netzwerkzugriff einschränken",
+  "settings.sandboxing.network.description":
+    "Blockiert den ausgehenden Netzwerkzugriff für vom Modell initiierte Befehle und HTTP-Tools. Lokale MCP-Server und Plugin-Hooks sind von dieser Einschränkung ausgenommen. Anbieter- und Modellinferenzdatenverkehr bleibt verfügbar.",
   "settings.experimental.mcpTimeout.title": "MCP-Zeitlimit (ms)",
   "settings.experimental.mcpTimeout.description": "Zeitlimit für MCP-Server-Anfragen in Millisekunden",
   "settings.experimental.remote.title": "Remote-Steuerung",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/en.ts b/packages/kilo-vscode/webview-ui/src/i18n/en.ts
index 6891f32621..f3996d1581 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/en.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/en.ts
@@ -1314,6 +1314,10 @@ export const dict = {
   "settings.experimental.sandbox.title": "Sandbox",
   "settings.experimental.sandbox.description":
     "Run agent shell commands inside an OS-level sandbox that restricts writes to the project and Kilo state directories",
+  "settings.sandboxing.title": "Sandboxing",
+  "settings.sandboxing.network.title": "Restrict Network Access",
+  "settings.sandboxing.network.description":
+    "Block outbound network access from model-originated commands and HTTP tools. Local MCP servers and plugin hooks run outside this restriction. Provider and model inference traffic remains available.",
   "settings.experimental.mcpTimeout.title": "MCP Timeout (ms)",
   "settings.experimental.mcpTimeout.description": "Timeout for MCP server requests in milliseconds",
   "settings.experimental.remote.title": "Remote Control",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/es.ts b/packages/kilo-vscode/webview-ui/src/i18n/es.ts
index 407eddc52f..8ad90a3577 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/es.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/es.ts
@@ -1344,6 +1344,10 @@ export const dict = {
     "Elige el modelo de transcripción de Kilo Gateway para la entrada de voz.",
   "settings.experimental.continueOnDeny.title": "Continuar al denegar",
   "settings.experimental.continueOnDeny.description": "Continuar el bucle del agente cuando se deniega un permiso",
+  "settings.sandboxing.title": "Sandbox",
+  "settings.sandboxing.network.title": "Restringir el acceso a la red",
+  "settings.sandboxing.network.description":
+    "Bloquea el acceso saliente a la red para los comandos iniciados por el modelo y las herramientas HTTP. Los servidores MCP locales y los hooks de plugins no están sujetos a esta restricción. El tráfico de proveedores y de inferencia de modelos sigue estando disponible.",
   "settings.experimental.mcpTimeout.title": "Tiempo de espera MCP (ms)",
   "settings.experimental.mcpTimeout.description": "Tiempo de espera para solicitudes del servidor MCP en milisegundos",
   "settings.experimental.remote.title": "Control Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/fr.ts b/packages/kilo-vscode/webview-ui/src/i18n/fr.ts
index 4dff72678d..656e647fb7 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/fr.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/fr.ts
@@ -1360,6 +1360,10 @@ export const dict = {
   "settings.experimental.continueOnDeny.title": "Continuer en cas de refus",
   "settings.experimental.continueOnDeny.description":
     "Continuer la boucle de l'agent lorsqu'une autorisation est refusée",
+  "settings.sandboxing.title": "Mise en bac à sable",
+  "settings.sandboxing.network.title": "Restreindre l'accès au réseau",
+  "settings.sandboxing.network.description":
+    "Bloquer l'accès réseau sortant des commandes provenant du modèle et des outils HTTP. Les serveurs MCP locaux et les hooks de plugin ne sont pas soumis à cette restriction. Le trafic d'inférence des fournisseurs et des modèles reste disponible.",
   "settings.experimental.mcpTimeout.title": "Délai MCP (ms)",
   "settings.experimental.mcpTimeout.description": "Délai des requêtes du serveur MCP en millisecondes",
   "settings.experimental.remote.title": "Contrôle Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/it.ts b/packages/kilo-vscode/webview-ui/src/i18n/it.ts
index a150563f9d..9ae8414475 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/it.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/it.ts
@@ -1161,6 +1161,10 @@ export const dict = {
   "settings.experimental.codebaseSearch.description": "Abilita ricerca in linguaggio naturale con AI nel codebase",
   "settings.experimental.continueOnDeny.title": "Continua dopo rifiuto",
   "settings.experimental.continueOnDeny.description": "Continua il loop agente quando un'autorizzazione viene negata",
+  "settings.sandboxing.title": "Sandbox",
+  "settings.sandboxing.network.title": "Limita l'accesso alla rete",
+  "settings.sandboxing.network.description":
+    "Blocca l'accesso in uscita alla rete per i comandi avviati dal modello e gli strumenti HTTP. I server MCP locali e gli hook dei plugin operano al di fuori di questa restrizione. Il traffico verso i provider e per l'inferenza dei modelli rimane disponibile.",
   "settings.experimental.mcpTimeout.title": "Timeout MCP (ms)",
   "settings.experimental.mcpTimeout.description": "Timeout per richieste server MCP in millisecondi",
   "settings.experimental.remote.title": "Controllo remoto",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/ja.ts b/packages/kilo-vscode/webview-ui/src/i18n/ja.ts
index 15b1a84bfc..9ec27bf703 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/ja.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/ja.ts
@@ -1322,6 +1322,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "音声入力に使用するKilo Gateway文字起こしモデルを選択します。",
   "settings.experimental.continueOnDeny.title": "拒否時に続行",
   "settings.experimental.continueOnDeny.description": "権限が拒否された場合にエージェントループを続行",
+  "settings.sandboxing.title": "サンドボックス化",
+  "settings.sandboxing.network.title": "ネットワークアクセスを制限",
+  "settings.sandboxing.network.description":
+    "モデルから発行されたコマンドと HTTP ツールによる外部ネットワークアクセスをブロックします。ローカル MCP サーバーとプラグインフックは、この制限の対象外です。プロバイダーおよびモデルへの推論通信は引き続き利用できます。",
   "settings.experimental.mcpTimeout.title": "MCPタイムアウト（ミリ秒）",
   "settings.experimental.mcpTimeout.description": "MCPサーバーリクエストのタイムアウト（ミリ秒）",
   "settings.experimental.remote.title": "Remote コントロール",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/ko.ts b/packages/kilo-vscode/webview-ui/src/i18n/ko.ts
index 646b77c8e8..a26e3306f6 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/ko.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/ko.ts
@@ -1316,6 +1316,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "음성 입력에 사용할 Kilo Gateway 변환 모델을 선택하세요.",
   "settings.experimental.continueOnDeny.title": "거부 시 계속",
   "settings.experimental.continueOnDeny.description": "권한이 거부되면 에이전트 루프 계속",
+  "settings.sandboxing.title": "샌드박스",
+  "settings.sandboxing.network.title": "네트워크 액세스 제한",
+  "settings.sandboxing.network.description":
+    "모델이 실행한 명령과 HTTP 도구의 아웃바운드 네트워크 액세스를 차단합니다. 로컬 MCP 서버와 플러그인 훅에는 이 제한이 적용되지 않습니다. 공급자 및 모델 추론 트래픽은 계속 사용할 수 있습니다.",
   "settings.experimental.mcpTimeout.title": "MCP 타임아웃 (ms)",
   "settings.experimental.mcpTimeout.description": "MCP 서버 요청의 타임아웃 시간 (밀리초)",
   "settings.experimental.remote.title": "Remote 제어",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/nl.ts b/packages/kilo-vscode/webview-ui/src/i18n/nl.ts
index f2ee0a05a1..ad3a5a966d 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/nl.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/nl.ts
@@ -1330,6 +1330,10 @@ export const dict = {
   "settings.experimental.continueOnDeny.title": "Doorgaan bij weigering",
   "settings.experimental.continueOnDeny.description":
     "Ga door met de agent loop wanneer een toestemming wordt geweigerd",
+  "settings.sandboxing.title": "Sandbox",
+  "settings.sandboxing.network.title": "Netwerktoegang beperken",
+  "settings.sandboxing.network.description":
+    "Blokkeer uitgaande netwerktoegang voor door het model geïnitieerde opdrachten en HTTP-tools. Lokale MCP-servers en plugin-hooks vallen buiten deze beperking. Netwerkverkeer voor providers en modelinferentie blijft beschikbaar.",
   "settings.experimental.mcpTimeout.title": "MCP Timeout (ms)",
   "settings.experimental.mcpTimeout.description": "Timeout voor MCP-serververzoeken in milliseconden",
   "settings.experimental.remote.title": "Remote-bediening",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/no.ts b/packages/kilo-vscode/webview-ui/src/i18n/no.ts
index acee5b27a1..fddcc85e4b 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/no.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/no.ts
@@ -1290,6 +1290,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "Velg Kilo Gateway-transkripsjonsmodellen for taleinndata.",
   "settings.experimental.continueOnDeny.title": "Fortsett ved avvisning",
   "settings.experimental.continueOnDeny.description": "Fortsett agentløkken når en tillatelse avvises",
+  "settings.sandboxing.title": "Kjøring i sandkasse",
+  "settings.sandboxing.network.title": "Begrens nettverkstilgang",
+  "settings.sandboxing.network.description":
+    "Blokker utgående nettverkstilgang fra kommandoer generert av modellen og HTTP-verktøy. Lokale MCP-servere og programtilleggskroker kjører utenfor denne begrensningen. Trafikk for leverandør- og modellinferens forblir tilgjengelig.",
   "settings.experimental.mcpTimeout.title": "MCP-tidsavbrudd (ms)",
   "settings.experimental.mcpTimeout.description": "Tidsavbrudd for MCP-serverforespørsler i millisekunder",
   "settings.experimental.remote.title": "Remote-kontroll",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/pl.ts b/packages/kilo-vscode/webview-ui/src/i18n/pl.ts
index 0b5a3b3e33..f7db244072 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/pl.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/pl.ts
@@ -1291,6 +1291,10 @@ export const dict = {
     "Wybierz model transkrypcji Kilo Gateway dla wprowadzania głosowego.",
   "settings.experimental.continueOnDeny.title": "Kontynuuj przy odmowie",
   "settings.experimental.continueOnDeny.description": "Kontynuuj pętlę agenta po odmowie uprawnienia",
+  "settings.sandboxing.title": "Izolacja w piaskownicy",
+  "settings.sandboxing.network.title": "Ogranicz dostęp do sieci",
+  "settings.sandboxing.network.description":
+    "Blokuj wychodzący dostęp do sieci z poleceń pochodzących od modelu i narzędzi HTTP. Lokalne serwery MCP i hooki wtyczek nie podlegają temu ograniczeniu. Ruch do dostawców i modeli na potrzeby wnioskowania pozostaje dostępny.",
   "settings.experimental.mcpTimeout.title": "Limit czasu MCP (ms)",
   "settings.experimental.mcpTimeout.description": "Limit czasu żądań serwera MCP w milisekundach",
   "settings.experimental.remote.title": "Sterowanie Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/ru.ts b/packages/kilo-vscode/webview-ui/src/i18n/ru.ts
index b34d18c94c..6990d1f7e7 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/ru.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/ru.ts
@@ -1332,6 +1332,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "Выберите модель транскрипции Kilo Gateway для голосового ввода.",
   "settings.experimental.continueOnDeny.title": "Продолжить при отказе",
   "settings.experimental.continueOnDeny.description": "Продолжить цикл агента при отказе в разрешении",
+  "settings.sandboxing.title": "Изоляция в песочнице",
+  "settings.sandboxing.network.title": "Ограничить доступ к сети",
+  "settings.sandboxing.network.description":
+    "Блокировать исходящий доступ к сети для команд, инициированных моделью, и HTTP-инструментов. Локальные серверы MCP и хуки плагинов не подпадают под это ограничение. Трафик к провайдерам и моделям для инференса остаётся доступным.",
   "settings.experimental.mcpTimeout.title": "Таймаут MCP (мс)",
   "settings.experimental.mcpTimeout.description": "Таймаут запросов MCP-сервера в миллисекундах",
   "settings.experimental.remote.title": "Управление Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/th.ts b/packages/kilo-vscode/webview-ui/src/i18n/th.ts
index 8faa0d02b1..6b917cc042 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/th.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/th.ts
@@ -1312,6 +1312,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "เลือกโมเดลการถอดเสียง Kilo Gateway สำหรับการป้อนข้อมูลด้วยเสียง",
   "settings.experimental.continueOnDeny.title": "ดำเนินต่อเมื่อถูกปฏิเสธ",
   "settings.experimental.continueOnDeny.description": "ดำเนินลูปเอเจนต์ต่อเมื่อสิทธิ์ถูกปฏิเสธ",
+  "settings.sandboxing.title": "การทำงานในแซนด์บ็อกซ์",
+  "settings.sandboxing.network.title": "จำกัดการเข้าถึงเครือข่าย",
+  "settings.sandboxing.network.description":
+    "บล็อกการเข้าถึงเครือข่ายขาออกจากคำสั่งที่มาจากโมเดลและเครื่องมือ HTTP เซิร์ฟเวอร์ MCP ภายในเครื่องและฮุกของปลั๊กอินทำงานอยู่นอกข้อจำกัดนี้ การรับส่งข้อมูลสำหรับการอนุมานของผู้ให้บริการและโมเดลยังคงใช้งานได้",
   "settings.experimental.mcpTimeout.title": "หมดเวลา MCP (มิลลิวินาที)",
   "settings.experimental.mcpTimeout.description": "หมดเวลาสำหรับคำขอเซิร์ฟเวอร์ MCP เป็นมิลลิวินาที",
   "settings.experimental.remote.title": "การควบคุม Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/tr.ts b/packages/kilo-vscode/webview-ui/src/i18n/tr.ts
index 5a17670584..462b1187da 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/tr.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/tr.ts
@@ -1321,6 +1321,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "Sesli giriş için Kilo Gateway transkripsiyon modelini seçin.",
   "settings.experimental.continueOnDeny.title": "Reddetme Durumunda Devam Et",
   "settings.experimental.continueOnDeny.description": "Bir izin reddedildiğinde ajan döngüsüne devam et",
+  "settings.sandboxing.title": "Sandbox",
+  "settings.sandboxing.network.title": "Ağ Erişimini Kısıtla",
+  "settings.sandboxing.network.description":
+    "Model tarafından başlatılan komutların ve HTTP araçlarının giden ağ erişimini engelleyin. Yerel MCP sunucuları ve eklenti kancaları bu kısıtlamanın dışında çalışır. Sağlayıcı ve model çıkarım trafiği kullanılabilir durumda kalır.",
   "settings.experimental.mcpTimeout.title": "MCP Zaman Aşımı (ms)",
   "settings.experimental.mcpTimeout.description": "MCP sunucu istekleri için milisaniye cinsinden zaman aşımı",
   "settings.experimental.remote.title": "Remote Kontrolü",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/uk.ts b/packages/kilo-vscode/webview-ui/src/i18n/uk.ts
index f555524280..3fd1915ba1 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/uk.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/uk.ts
@@ -1320,6 +1320,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "Виберіть модель транскрипції Kilo Gateway для голосового введення.",
   "settings.experimental.continueOnDeny.title": "Продовжувати при відхиленні",
   "settings.experimental.continueOnDeny.description": "Продовжувати цикл агента, коли дозвіл відхилено",
+  "settings.sandboxing.title": "Пісочниця",
+  "settings.sandboxing.network.title": "Обмежити доступ до мережі",
+  "settings.sandboxing.network.description":
+    "Блокуйте вихідний доступ до мережі для команд, ініційованих моделлю, та HTTP-інструментів. Локальні MCP-сервери й хуки плагінів працюють поза цим обмеженням. Трафік провайдерів та інференсу моделей залишається доступним.",
   "settings.experimental.mcpTimeout.title": "Тайм-аут MCP (мс)",
   "settings.experimental.mcpTimeout.description": "Тайм-аут у мілісекундах для запитів до MCP-сервера",
   "settings.experimental.remote.title": "Керування Remote",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/zh.ts b/packages/kilo-vscode/webview-ui/src/i18n/zh.ts
index d88febb867..c1414a9f14 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/zh.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/zh.ts
@@ -1290,6 +1290,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "选择用于语音输入的 Kilo Gateway 转录模型。",
   "settings.experimental.continueOnDeny.title": "拒绝后继续",
   "settings.experimental.continueOnDeny.description": "权限被拒绝时继续智能体循环",
+  "settings.sandboxing.title": "沙盒",
+  "settings.sandboxing.network.title": "限制网络访问",
+  "settings.sandboxing.network.description":
+    "阻止模型发起的命令和 HTTP 工具进行出站网络访问。本地 MCP 服务器和插件钩子不受此限制。提供商和模型推理流量仍然可用。",
   "settings.experimental.mcpTimeout.title": "MCP 超时（毫秒）",
   "settings.experimental.mcpTimeout.description": "MCP 服务器请求的超时时间（毫秒）",
   "settings.experimental.remote.title": "Remote 控制",
diff --git a/packages/kilo-vscode/webview-ui/src/i18n/zht.ts b/packages/kilo-vscode/webview-ui/src/i18n/zht.ts
index d639535bc4..597f38049a 100644
--- a/packages/kilo-vscode/webview-ui/src/i18n/zht.ts
+++ b/packages/kilo-vscode/webview-ui/src/i18n/zht.ts
@@ -1255,6 +1255,10 @@ export const dict = {
   "settings.models.speechToTextModel.description": "選擇用於語音輸入的 Kilo Gateway 轉錄模型。",
   "settings.experimental.continueOnDeny.title": "拒絕後繼續",
   "settings.experimental.continueOnDeny.description": "權限被拒絕時繼續 Agent 迴圈",
+  "settings.sandboxing.title": "沙盒",
+  "settings.sandboxing.network.title": "限制網路存取",
+  "settings.sandboxing.network.description":
+    "封鎖模型發起的命令和 HTTP 工具的對外網路存取。本機 MCP 伺服器和外掛程式鉤子不受此限制。供應商與模型推論流量仍然可用。",
   "settings.experimental.mcpTimeout.title": "MCP 逾時（毫秒）",
   "settings.experimental.mcpTimeout.description": "MCP 伺服器請求的逾時時間（毫秒）",
   "settings.experimental.remote.title": "Remote 控制",
diff --git a/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx b/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
index 441dbbdd9a..4e9c67b005 100644
--- a/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
+++ b/packages/kilo-vscode/webview-ui/src/stories/StoryProviders.tsx
@@ -41,6 +41,7 @@ import { hasIndexingPlugin } from "@kilocode/kilo-indexing/detect"
 import { resolveTemplate } from "../context/language-utils"
 import type {
   Config,
+  FeatureFlags,
   KilocodeNotification,
   PermissionRequest,
   ProviderAuthState,
@@ -280,6 +281,7 @@ interface StoryProvidersProps {
   sessionID?: string
   /** When provided, injects a mock ConfigContext with this config instead of the real ConfigProvider. */
   config?: Config
+  features?: Partial<FeatureFlags>
   globalConfig?: Config
   projectConfig?: Config
   onConfigChange?: (config: Config) => void
@@ -295,6 +297,7 @@ interface StoryProvidersProps {
 /** Wraps children with either a mock ConfigContext (when config prop is given) or the real ConfigProvider. */
 const ConfigWrapper: ParentComponent<{
   config?: Config
+  features?: Partial<FeatureFlags>
   globalConfig?: Config
   projectConfig?: Config
   onConfigChange?: (config: Config) => void
@@ -314,8 +317,8 @@ const ConfigWrapper: ParentComponent<{
       }
 
       return {
-        indexing: hasIndexingPlugin(config.plugin ?? []),
-        sandboxControls: false,
+        indexing: props.features?.indexing ?? hasIndexingPlugin(config.plugin ?? []),
+        sandboxControls: props.features?.sandboxControls ?? false,
       }
     })
 
@@ -389,6 +392,7 @@ export const StoryProviders: ParentComponent<StoryProvidersProps> = (props) => {
         <FeedbackProvider>
           <ConfigWrapper
             config={props.config}
+            features={props.features}
             globalConfig={props.globalConfig}
             projectConfig={props.projectConfig}
             onConfigChange={props.onConfigChange}
diff --git a/packages/kilo-vscode/webview-ui/src/stories/settings.stories.tsx b/packages/kilo-vscode/webview-ui/src/stories/settings.stories.tsx
index 755554ec02..8d621bd767 100644
--- a/packages/kilo-vscode/webview-ui/src/stories/settings.stories.tsx
+++ b/packages/kilo-vscode/webview-ui/src/stories/settings.stories.tsx
@@ -51,6 +51,42 @@ export const SettingsPanel: Story = {
   ),
 }
 
+export const SandboxingPanel: Story = {
+  name: "Settings — sandboxing network restriction",
+  render: () => (
+    <StoryProviders
+      config={{ experimental: { sandbox: true, sandbox_restrict_network: true } }}
+      features={{ sandboxControls: true }}
+    >
+      <div style={{ height: "700px", display: "flex", "flex-direction": "column" }}>
+        <Settings tab="sandboxing" />
+      </div>
+    </StoryProviders>
+  ),
+}
+
+export const SandboxExperimentOnly: Story = {
+  name: "Settings — sandbox experiment without internal controls",
+  render: () => (
+    <StoryProviders config={{ experimental: { sandbox: true } }} features={{ sandboxControls: false }}>
+      <div style={{ height: "700px", display: "flex", "flex-direction": "column" }}>
+        <Settings tab="experimental" />
+      </div>
+    </StoryProviders>
+  ),
+}
+
+export const SandboxControlsOnly: Story = {
+  name: "Settings — internal controls without sandbox experiment",
+  render: () => (
+    <StoryProviders config={{ experimental: { sandbox: false } }} features={{ sandboxControls: true }}>
+      <div style={{ height: "700px", display: "flex", "flex-direction": "column" }}>
+        <Settings tab="experimental" />
+      </div>
+    </StoryProviders>
+  ),
+}
+
 export const ProvidersConfigure: Story = {
   name: "ProvidersTab — no providers configured",
   render: () => (
diff --git a/packages/kilo-vscode/webview-ui/src/types/messages/config.ts b/packages/kilo-vscode/webview-ui/src/types/messages/config.ts
index 078ff799c0..65ce65617e 100644
--- a/packages/kilo-vscode/webview-ui/src/types/messages/config.ts
+++ b/packages/kilo-vscode/webview-ui/src/types/messages/config.ts
@@ -45,6 +45,7 @@ export interface ExperimentalConfig {
   continue_loop_on_deny?: boolean
   mcp_timeout?: number
   sandbox?: boolean
+  sandbox_restrict_network?: boolean
 }
 
 export interface CommitMessageConfig {
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index d433b1c3ba..b974767433 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -405,7 +405,12 @@ export const Info = Schema.Struct({
       }),
       // kilocode_change start
       sandbox: Schema.optional(Schema.Boolean).annotate({
-        description: "Run agent shell commands inside an OS-level sandbox that restricts writes to the project and Kilo state directories",
+        description:
+          "Run agent tools inside a sandbox that restricts writes to project and Kilo state directories and can restrict outbound network access",
+      }),
+      sandbox_restrict_network: Schema.optional(Schema.Boolean).annotate({
+        description:
+          "Restrict outbound network access for model-originated commands and first-party HTTP tools; local MCP servers and plugin hooks are not covered (default: true)",
       }),
       // kilocode_change end
       mcp_timeout: Schema.optional(PositiveInt).annotate({
diff --git a/packages/opencode/src/kilocode/sandbox/network.ts b/packages/opencode/src/kilocode/sandbox/network.ts
new file mode 100644
index 0000000000..dc6e3efe56
--- /dev/null
+++ b/packages/opencode/src/kilocode/sandbox/network.ts
@@ -0,0 +1,36 @@
+import { Effect, Layer } from "effect"
+import { FetchHttpClient } from "effect/unstable/http"
+import { assertNetwork, networkHttpLayer } from "@kilocode/sandbox"
+
+const Builtin = Symbol("kilo.sandbox.builtinTool")
+const Remote = Symbol("kilo.sandbox.remoteMcp")
+const indirect = new Set(["codebase_search", "semantic_search", "lsp"])
+
+export const httpLayer = networkHttpLayer.pipe(Layer.provide(FetchHttpClient.layer))
+
+export function builtin<A extends object>(value: A): A {
+  if (!(Builtin in value)) Object.defineProperty(value, Builtin, { value: true })
+  return value
+}
+
+export function isBuiltin(value: object) {
+  return Builtin in value
+}
+
+export function remote<A extends object>(value: A): A {
+  Object.defineProperty(value, Remote, { value: true })
+  return value
+}
+
+export function tool<A, E, R>(value: { id: string }, effect: Effect.Effect<A, E, R>) {
+  if (!(Builtin in value)) {
+    return assertNetwork(`custom tool:${value.id}`, "executeTool").pipe(Effect.andThen(effect))
+  }
+  if (!indirect.has(value.id)) return effect
+  return assertNetwork(`tool:${value.id}`, "executeTool").pipe(Effect.andThen(effect))
+}
+
+export function mcp<A, E, R>(value: object, effect: Effect.Effect<A, E, R>) {
+  if (!(Remote in value)) return effect
+  return assertNetwork("remote MCP delegated authority", "executeMcp").pipe(Effect.andThen(effect))
+}
diff --git a/packages/opencode/src/kilocode/sandbox/policy.ts b/packages/opencode/src/kilocode/sandbox/policy.ts
index 156c2eb048..afe7167e84 100644
--- a/packages/opencode/src/kilocode/sandbox/policy.ts
+++ b/packages/opencode/src/kilocode/sandbox/policy.ts
@@ -6,6 +6,7 @@ import { run as runSandbox, type Profile } from "@kilocode/sandbox"
 import { Config } from "@/config/config"
 import { InstanceState } from "@/effect/instance-state"
 import type { InstanceContext } from "@/project/instance-context"
+import * as Network from "./network"
 
 function root(path: string) {
   return { path, kind: "subtree" as const }
@@ -41,7 +42,7 @@ function isolated(ctx: InstanceContext) {
   return linked(path.resolve(ctx.directory), path.resolve(ctx.worktree))
 }
 
-export function profile(ctx: InstanceContext): Profile {
+export function profile(ctx: InstanceContext, mode: Profile["network"]["mode"] = "deny"): Profile {
   const project = isolated(ctx)
     ? [ctx.directory]
     : ctx.directory === ctx.worktree
@@ -66,7 +67,7 @@ export function profile(ctx: InstanceContext): Profile {
       temporaryDirectory: Global.Path.tmp,
     },
     network: {
-      mode: "allow",
+      mode,
       allowedHosts: [],
     },
     environment: {
@@ -85,6 +86,15 @@ export function execute<A, E, R>(effect: Effect.Effect<A, E, R>) {
     const config = yield* Config.Service
     const cfg = yield* config.get()
     if (!cfg.experimental?.sandbox) return yield* effect
-    return yield* runSandbox(profile(yield* InstanceState.context), effect)
+    const mode = cfg.experimental.sandbox_restrict_network === false ? "allow" : "deny"
+    return yield* runSandbox(profile(yield* InstanceState.context, mode), effect)
   })
 }
+
+export function executeTool<A, E, R>(tool: { id: string }, effect: Effect.Effect<A, E, R>) {
+  return execute(Network.tool(tool, effect))
+}
+
+export function executeMcp<A, E, R>(tool: object, effect: Effect.Effect<A, E, R>) {
+  return execute(Network.mcp(tool, effect))
+}
diff --git a/packages/opencode/src/mcp/index.ts b/packages/opencode/src/mcp/index.ts
index a8f2726b01..4ad1d3b65d 100644
--- a/packages/opencode/src/mcp/index.ts
+++ b/packages/opencode/src/mcp/index.ts
@@ -40,6 +40,7 @@ import { EffectBridge } from "@/effect/bridge"
 import { InstanceState } from "@/effect/instance-state"
 import { ChildProcess, ChildProcessSpawner } from "effect/unstable/process"
 import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
+import * as SandboxNetwork from "@/kilocode/sandbox/network" // kilocode_change
 
 const log = Log.create({ service: "mcp" })
 const DEFAULT_TIMEOUT = 30_000
@@ -718,7 +719,11 @@ export const layer = Layer.effect(
 
             const timeout = entry?.timeout ?? defaultTimeout
             for (const mcpTool of listed) {
-              result[sanitize(clientName) + "_" + sanitize(mcpTool.name)] = convertMcpTool(mcpTool, client, timeout)
+              // kilocode_change start
+              const tool = convertMcpTool(mcpTool, client, timeout)
+              result[sanitize(clientName) + "_" + sanitize(mcpTool.name)] =
+                entry?.type === "remote" ? SandboxNetwork.remote(tool) : tool
+              // kilocode_change end
             }
           }),
         { concurrency: "unbounded" },
diff --git a/packages/opencode/src/session/tools.ts b/packages/opencode/src/session/tools.ts
index da8e076f58..63756fb4ad 100644
--- a/packages/opencode/src/session/tools.ts
+++ b/packages/opencode/src/session/tools.ts
@@ -90,7 +90,7 @@ export const resolve = Effect.fn("SessionTools.resolve")(function* (input: {
               { args },
             )
             // kilocode_change start
-            const result = yield* SandboxPolicy.execute(item.execute(args, ctx))
+            const result = yield* SandboxPolicy.executeTool(item, item.execute(args, ctx))
             // kilocode_change end
             const output = {
               ...result,
@@ -132,10 +132,15 @@ export const resolve = Effect.fn("SessionTools.resolve")(function* (input: {
             { tool: key, sessionID: ctx.sessionID, callID: opts.toolCallId },
             { args },
           )
-          const result: Awaited<ReturnType<NonNullable<typeof execute>>> = yield* Effect.gen(function* () {
-            yield* ctx.ask({ permission: key, metadata: {}, patterns: ["*"], always: ["*"] })
-            return yield* Effect.promise(() => execute(args, opts))
-          }).pipe(
+          // kilocode_change start
+          const result: Awaited<ReturnType<NonNullable<typeof execute>>> = yield* SandboxPolicy.executeMcp(
+            item,
+            Effect.gen(function* () {
+              yield* ctx.ask({ permission: key, metadata: {}, patterns: ["*"], always: ["*"] })
+              return yield* Effect.promise(() => execute(args, opts))
+            }),
+          ).pipe(
+            // kilocode_change end
             Effect.withSpan("Tool.execute", {
               attributes: {
                 "tool.name": key,
diff --git a/packages/opencode/src/tool/registry.ts b/packages/opencode/src/tool/registry.ts
index a5f2798c73..c184b6e77e 100644
--- a/packages/opencode/src/tool/registry.ts
+++ b/packages/opencode/src/tool/registry.ts
@@ -39,7 +39,7 @@ import { Glob } from "@opencode-ai/core/util/glob"
 import path from "path"
 import { pathToFileURL } from "url"
 import { Effect, Layer, Context } from "effect"
-import { FetchHttpClient, HttpClient } from "effect/unstable/http"
+import { HttpClient } from "effect/unstable/http" // kilocode_change
 import { ChildProcessSpawner } from "effect/unstable/process/ChildProcessSpawner"
 import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
 import { Ripgrep } from "../file/ripgrep"
@@ -60,6 +60,7 @@ import { SessionStatus } from "@/session/status" // kilocode_change
 import { Reference } from "@/reference/reference"
 import { BackgroundJob } from "@/background/job"
 import { RuntimeFlags } from "@/effect/runtime-flags"
+import * as ToolNetwork from "@/kilocode/sandbox/network" // kilocode_change
 
 const log = Log.create({ service: "tool.registry" })
 
@@ -310,7 +311,7 @@ export const layer: Layer.Layer<
 
     const all: Interface["all"] = Effect.fn("ToolRegistry.all")(function* () {
       const s = yield* InstanceState.get(state)
-      return [...s.builtin, ...s.custom] as Tool.Def[]
+      return [...s.builtin.map(ToolNetwork.builtin), ...s.custom] as Tool.Def[] // kilocode_change
     })
 
     const ids: Interface["ids"] = Effect.fn("ToolRegistry.ids")(function* () {
@@ -382,7 +383,8 @@ export const layer: Layer.Layer<
             output.parameters === tool.parameters || output.jsonSchema !== tool.jsonSchema
               ? output.jsonSchema
               : undefined
-          return {
+          // kilocode_change start
+          const result = {
             id: tool.id,
             description: [
               output.description,
@@ -396,6 +398,8 @@ export const layer: Layer.Layer<
             execute: tool.execute,
             formatValidationError: tool.formatValidationError,
           }
+          return ToolNetwork.isBuiltin(tool) ? ToolNetwork.builtin(result) : result
+          // kilocode_change end
         }),
         { concurrency: "unbounded" },
       )
@@ -429,10 +433,18 @@ export const defaultLayer = Layer.suspend(
         Layer.provide(Instruction.defaultLayer),
         Layer.provide(AppFileSystem.defaultLayer),
         Layer.provide(Bus.layer),
-        Layer.provide(FetchHttpClient.layer),
+        Layer.provide(ToolNetwork.httpLayer), // kilocode_change
         Layer.provide(Format.defaultLayer),
         Layer.provide(CrossSpawnSpawner.defaultLayer),
-        Layer.provide(Ripgrep.defaultLayer),
+        // kilocode_change start
+        Layer.provide(
+          Ripgrep.layer.pipe(
+            Layer.provide(ToolNetwork.httpLayer),
+            Layer.provide(AppFileSystem.defaultLayer),
+            Layer.provide(CrossSpawnSpawner.defaultLayer),
+          ),
+        ),
+        // kilocode_change end
         Layer.provide(Truncate.defaultLayer),
       )
       // kilocode_change start - provide Kilo-owned registry dependencies
diff --git a/packages/opencode/test/kilocode/sandbox/config-network.test.ts b/packages/opencode/test/kilocode/sandbox/config-network.test.ts
new file mode 100644
index 0000000000..c42a9815c5
--- /dev/null
+++ b/packages/opencode/test/kilocode/sandbox/config-network.test.ts
@@ -0,0 +1,78 @@
+import { Cause, Effect, Exit, Layer } from "effect"
+import { expect } from "bun:test"
+import { HttpClient } from "effect/unstable/http"
+import { ProjectID } from "@/project/schema"
+import { InstanceRef } from "@/effect/instance-ref"
+import * as SandboxPolicy from "@/kilocode/sandbox/policy"
+import * as ToolNetwork from "@/kilocode/sandbox/network"
+import { TestConfig } from "../../fixture/config"
+import { testEffect } from "../../lib/effect"
+
+const ctx = {
+  directory: process.cwd(),
+  worktree: process.cwd(),
+  project: {
+    id: ProjectID.make("sandbox-config-network"),
+    worktree: process.cwd(),
+    vcs: "git" as const,
+    time: { created: 0, updated: 0 },
+    sandboxes: [],
+  },
+}
+
+function layer(restrict?: boolean) {
+  return Layer.mergeAll(
+    ToolNetwork.httpLayer,
+    TestConfig.layer({
+      get: () =>
+        Effect.succeed({
+          experimental: {
+            sandbox: true,
+            sandbox_restrict_network: restrict,
+          },
+        }),
+    }),
+  )
+}
+
+function server() {
+  let requests = 0
+  const server = Bun.serve({
+    hostname: "127.0.0.1",
+    port: 0,
+    fetch() {
+      requests++
+      return new Response("sandbox-config-ok")
+    },
+  })
+  return { server, requests: () => requests }
+}
+
+const restricted = testEffect(layer())
+const open = testEffect(layer(false))
+
+restricted.live("keeps network restriction enabled by default", () => {
+  const target = server()
+  return Effect.gen(function* () {
+    const http = yield* HttpClient.HttpClient
+    const exit = yield* SandboxPolicy.execute(http.get(target.server.url)).pipe(
+      Effect.provideService(InstanceRef, ctx),
+      Effect.exit,
+    )
+    expect(Exit.isFailure(exit)).toBe(true)
+    if (Exit.isFailure(exit)) expect(Cause.pretty(exit.cause)).toContain("Sandbox denied outbound network access")
+    expect(target.requests()).toBe(0)
+  }).pipe(Effect.ensuring(Effect.promise(() => target.server.stop(true))))
+})
+
+open.live("allows tool network traffic when network restriction is disabled", () => {
+  const target = server()
+  return Effect.gen(function* () {
+    const http = yield* HttpClient.HttpClient
+    const response = yield* SandboxPolicy.execute(http.get(target.server.url)).pipe(
+      Effect.provideService(InstanceRef, ctx),
+    )
+    expect(yield* response.text).toBe("sandbox-config-ok")
+    expect(target.requests()).toBe(1)
+  }).pipe(Effect.ensuring(Effect.promise(() => target.server.stop(true))))
+})
diff --git a/packages/opencode/test/kilocode/sandbox/http-tools.test.ts b/packages/opencode/test/kilocode/sandbox/http-tools.test.ts
new file mode 100644
index 0000000000..a60f8f17a5
--- /dev/null
+++ b/packages/opencode/test/kilocode/sandbox/http-tools.test.ts
@@ -0,0 +1,132 @@
+import { describe, expect } from "bun:test"
+import { Cause, Effect, Exit, Layer } from "effect"
+import { HttpClient } from "effect/unstable/http"
+import { run, type Profile } from "@kilocode/sandbox"
+import { Agent } from "@/agent/agent"
+import * as ToolNetwork from "@/kilocode/sandbox/network"
+import { MessageID, SessionID } from "@/session/schema"
+import * as McpWebSearch from "@/tool/mcp-websearch"
+import { Tool } from "@/tool/tool"
+import { Truncate } from "@/tool/truncate"
+import { WebFetchTool } from "@/tool/webfetch"
+import { testEffect } from "../../lib/effect"
+
+const layer = Layer.mergeAll(ToolNetwork.httpLayer, Truncate.defaultLayer, Agent.defaultLayer)
+const it = testEffect(layer)
+
+const ctx = {
+  sessionID: SessionID.make("ses_sandbox_network"),
+  messageID: MessageID.make("msg_sandbox_network"),
+  callID: "call_sandbox_network",
+  agent: "build",
+  abort: AbortSignal.any([]),
+  messages: [],
+  metadata: () => Effect.void,
+  ask: () => Effect.void,
+}
+
+function profile(mode: Profile["network"]["mode"]): Profile {
+  return {
+    filesystem: {
+      allowWrite: [{ path: process.cwd(), kind: "subtree" }],
+      denyWrite: [],
+      denyNames: [".git"],
+    },
+    network: { mode, allowedHosts: [] },
+    environment: { deny: [], set: {} },
+  }
+}
+
+function serve(fetch: (request: Request) => Response) {
+  return Effect.acquireRelease(
+    Effect.sync(() => Bun.serve({ hostname: "127.0.0.1", port: 0, fetch })),
+    (server) => Effect.promise(() => server.stop(true)),
+  )
+}
+
+const webfetch = Effect.fn("SandboxHttpToolsTest.webfetch")(function* (
+  args: Tool.InferParameters<typeof WebFetchTool>,
+) {
+  const info = yield* WebFetchTool
+  const tool = yield* info.init()
+  return yield* tool.execute(args, ctx)
+})
+
+const websearch = (http: HttpClient.HttpClient, url: string) =>
+  McpWebSearch.call(
+    http,
+    url,
+    "web_search_exa",
+    McpWebSearch.SearchArgs,
+    { query: "sandbox", type: "auto", numResults: 1, livecrawl: "fallback" },
+    "5 seconds",
+  )
+
+describe("model HTTP tool network policy", () => {
+  it.instance("allows the actual webfetch tool under an allow profile", () =>
+    Effect.gen(function* () {
+      const http = yield* serve(
+        () => new Response("allowed tool request", { headers: { "content-type": "text/plain" } }),
+      )
+      const result = yield* run(
+        profile("allow"),
+        webfetch({ url: new URL("/allowed", http.url).toString(), format: "text" }),
+      )
+      expect(result.output).toBe("allowed tool request")
+    }).pipe(Effect.scoped),
+  )
+
+  it.instance("denies the actual webfetch tool before it reaches the server", () => {
+    let requests = 0
+    return Effect.gen(function* () {
+      const http = yield* serve(() => {
+        requests++
+        return new Response("unexpected")
+      })
+      const exit = yield* Effect.exit(
+        run(profile("deny"), webfetch({ url: new URL("/denied", http.url).toString(), format: "text" })),
+      )
+      expect(Exit.isFailure(exit)).toBe(true)
+      if (Exit.isFailure(exit)) {
+        expect(Cause.pretty(exit.cause)).toContain("Sandbox denied outbound network access")
+      }
+      expect(requests).toBe(0)
+    }).pipe(Effect.scoped)
+  })
+
+  it.instance("allows the websearch provider helper under an allow profile", () =>
+    Effect.gen(function* () {
+      const payload = JSON.stringify({
+        jsonrpc: "2.0",
+        id: 1,
+        result: { content: [{ type: "text", text: "local search results" }] },
+      })
+      const server = yield* serve(() => new Response(payload))
+      const http = yield* HttpClient.HttpClient
+      const result = yield* run(profile("allow"), websearch(http, server.url.toString()))
+      expect(result).toBe("local search results")
+    }).pipe(Effect.scoped),
+  )
+
+  it.instance("denies the websearch provider helper before it reaches the server", () => {
+    let requests = 0
+    return Effect.gen(function* () {
+      const payload = JSON.stringify({
+        jsonrpc: "2.0",
+        id: 1,
+        result: { content: [{ type: "text", text: "unexpected" }] },
+      })
+      const server = yield* serve(() => {
+        requests++
+        return new Response(payload)
+      })
+      const http = yield* HttpClient.HttpClient
+      const exit = yield* Effect.exit(run(profile("deny"), websearch(http, server.url.toString())))
+      expect(Exit.isFailure(exit)).toBe(true)
+      if (Exit.isFailure(exit)) {
+        expect(Cause.pretty(exit.cause)).toContain("Sandbox denied outbound network access")
+      }
+      expect(requests).toBe(0)
+    }).pipe(Effect.scoped)
+  })
+})
diff --git a/packages/opencode/test/kilocode/sandbox/network.test.ts b/packages/opencode/test/kilocode/sandbox/network.test.ts
new file mode 100644
index 0000000000..c975034dde
--- /dev/null
+++ b/packages/opencode/test/kilocode/sandbox/network.test.ts
@@ -0,0 +1,141 @@
+import { describe, expect } from "bun:test"
+import { Cause, Effect, Exit } from "effect"
+import { run, type Profile } from "@kilocode/sandbox"
+import * as Network from "@/kilocode/sandbox/network"
+import { it } from "../../lib/effect"
+
+function profile(mode: Profile["network"]["mode"]): Profile {
+  return {
+    filesystem: {
+      allowWrite: [{ path: process.cwd(), kind: "subtree" }],
+      denyWrite: [],
+      denyNames: [".git"],
+    },
+    network: { mode, allowedHosts: [] },
+    environment: { deny: [], set: {} },
+  }
+}
+
+describe("model network boundaries", () => {
+  it.effect("rejects MCP delegated authority without invoking it in deny mode", () =>
+    Effect.gen(function* () {
+      let called = false
+      const exit = yield* Effect.exit(
+        run(
+          profile("deny"),
+          Network.mcp(
+            Network.remote({}),
+            Effect.sync(() => {
+              called = true
+            }),
+          ),
+        ),
+      )
+      expect(Exit.isFailure(exit)).toBe(true)
+      if (Exit.isFailure(exit)) {
+        expect(Cause.pretty(exit.cause)).toContain("Sandbox denied outbound network access")
+        expect(Cause.pretty(exit.cause)).toContain("remote MCP delegated authority")
+      }
+      expect(called).toBe(false)
+    }),
+  )
+
+  it.effect("allows MCP delegated authority in allow mode", () =>
+    Effect.gen(function* () {
+      let called = false
+      yield* run(
+        profile("allow"),
+        Network.mcp(
+          Network.remote({}),
+          Effect.sync(() => {
+            called = true
+          }),
+        ),
+      )
+      expect(called).toBe(true)
+    }),
+  )
+
+  it.effect("keeps local MCP tools outside remote delegated-authority policy", () =>
+    Effect.gen(function* () {
+      let called = false
+      yield* run(
+        profile("deny"),
+        Network.mcp(
+          {},
+          Effect.sync(() => {
+            called = true
+          }),
+        ),
+      )
+      expect(called).toBe(true)
+    }),
+  )
+
+  it.effect("keeps classified non-network built-in tools available in deny mode", () =>
+    Effect.gen(function* () {
+      let called = false
+      yield* run(
+        profile("deny"),
+        Network.tool(
+          Network.builtin({ id: "read" }),
+          Effect.sync(() => {
+            called = true
+          }),
+        ),
+      )
+      expect(called).toBe(true)
+    }),
+  )
+
+  it.effect("fails closed before opaque network helper tools run", () =>
+    Effect.gen(function* () {
+      let called = false
+      const exit = yield* Effect.exit(
+        run(
+          profile("deny"),
+          Network.tool(
+            Network.builtin({ id: "codebase_search" }),
+            Effect.sync(() => {
+              called = true
+            }),
+          ),
+        ),
+      )
+      expect(Exit.isFailure(exit)).toBe(true)
+      expect(called).toBe(false)
+    }),
+  )
+
+  it.live("fails closed before custom tool network code runs", () => {
+    let requests = 0
+    return Effect.acquireUseRelease(
+      Effect.sync(() =>
+        Bun.serve({
+          hostname: "127.0.0.1",
+          port: 0,
+          fetch: () => {
+            requests++
+            return new Response("unexpected")
+          },
+        }),
+      ),
+      (server) =>
+        Effect.gen(function* () {
+          const exit = yield* Effect.exit(
+            run(
+              profile("deny"),
+              Network.tool(
+                { id: "custom_network_tool" },
+                Effect.promise(() => fetch(server.url)),
+              ),
+            ),
+          )
+          expect(Exit.isFailure(exit)).toBe(true)
+          if (Exit.isFailure(exit)) expect(Cause.pretty(exit.cause)).toContain("custom tool:custom_network_tool")
+          expect(requests).toBe(0)
+        }),
+      (server) => Effect.promise(() => server.stop(true)),
+    )
+  })
+})
diff --git a/packages/opencode/test/kilocode/sandbox/policy.test.ts b/packages/opencode/test/kilocode/sandbox/policy.test.ts
index 8026102099..bf280fb830 100644
--- a/packages/opencode/test/kilocode/sandbox/policy.test.ts
+++ b/packages/opencode/test/kilocode/sandbox/policy.test.ts
@@ -181,6 +181,15 @@ describe("sandbox policy", () => {
     expect(profile(ctx).filesystem.temporaryDirectory).toBe(Global.Path.tmp)
   })
 
+  test("uses deny-by-default and configurable network profiles", async () => {
+    await using tmp = await fixture()
+    const dirs = tmp.extra
+    const ctx = context(dirs.a, dirs.a, dirs)
+
+    expect(profile(ctx).network).toEqual({ mode: "deny", allowedHosts: [] })
+    expect(profile(ctx, "allow").network).toEqual({ mode: "allow", allowedHosts: [] })
+  })
+
   test("keeps .git denied inside overlapping writable roots", async () => {
     await using tmp = await fixture()
     const dirs = tmp.extra
diff --git a/packages/opencode/test/kilocode/sandbox/session-tools.test.ts b/packages/opencode/test/kilocode/sandbox/session-tools.test.ts
index 88b1dfa3c9..a0d4b20f16 100644
--- a/packages/opencode/test/kilocode/sandbox/session-tools.test.ts
+++ b/packages/opencode/test/kilocode/sandbox/session-tools.test.ts
@@ -13,6 +13,7 @@ import { RuntimeFlags } from "@/effect/runtime-flags"
 import { InstanceRef } from "@/effect/instance-ref"
 import { Format } from "@/format"
 import { LSP } from "@/lsp/lsp"
+import * as ToolNetwork from "@/kilocode/sandbox/network"
 import { MCP } from "@/mcp"
 import { Permission } from "@/permission"
 import { ProjectID } from "@/project/schema"
@@ -139,7 +140,7 @@ const registry = Layer.effect(
   Effect.gen(function* () {
     const write = yield* WriteTool.pipe(Effect.flatMap(Tool.init))
     const shell = yield* ShellTool.pipe(Effect.flatMap(Tool.init))
-    const list = [write, shell]
+    const list = [ToolNetwork.builtin(write), ToolNetwork.builtin(shell)]
     return ToolRegistry.Service.of({
       ids: () => Effect.succeed(list.map((item) => item.id)),
       all: () => Effect.succeed(list),
diff --git a/packages/opencode/test/kilocode/sandbox/shell-network.test.ts b/packages/opencode/test/kilocode/sandbox/shell-network.test.ts
new file mode 100644
index 0000000000..41b1d480cc
--- /dev/null
+++ b/packages/opencode/test/kilocode/sandbox/shell-network.test.ts
@@ -0,0 +1,103 @@
+import { describe, expect, test } from "bun:test"
+import { Effect, Layer } from "effect"
+import { Config } from "@/config/config"
+import { RuntimeFlags } from "@/effect/runtime-flags"
+import { Plugin } from "@/plugin"
+import { Agent } from "@/agent/agent"
+import { ShellTool } from "@/tool/shell"
+import { Truncate } from "@/tool/truncate"
+import { MessageID, SessionID } from "@/session/schema"
+import { AppFileSystem } from "@opencode-ai/core/filesystem"
+import { CrossSpawnSpawner } from "@opencode-ai/core/cross-spawn-spawner"
+import { run as runSandbox, type Profile } from "@kilocode/sandbox"
+import { provideInstance, tmpdirScoped } from "../../fixture/fixture"
+
+const layer = Layer.mergeAll(
+  CrossSpawnSpawner.defaultLayer,
+  AppFileSystem.defaultLayer,
+  Plugin.defaultLayer,
+  Truncate.defaultLayer,
+  Config.defaultLayer,
+  Agent.defaultLayer,
+  RuntimeFlags.defaultLayer,
+)
+
+const ctx = {
+  sessionID: SessionID.make("ses_sandbox_network"),
+  messageID: MessageID.make("msg_sandbox_network"),
+  callID: "call_sandbox_network",
+  agent: "build",
+  abort: AbortSignal.any([]),
+  messages: [],
+  metadata: () => Effect.void,
+  ask: () => Effect.void,
+}
+
+function profile(root: string, mode: Profile["network"]["mode"]): Profile {
+  return {
+    filesystem: {
+      allowWrite: [{ path: root, kind: "subtree" }],
+      denyWrite: [],
+      denyNames: [".git"],
+    },
+    network: { mode, allowedHosts: [] },
+    environment: { deny: [], set: {} },
+  }
+}
+
+function server() {
+  let accepted = 0
+  const listener = Bun.listen({
+    hostname: "127.0.0.1",
+    port: 0,
+    socket: {
+      open(socket) {
+        accepted++
+        socket.write("model-shell-network-ok")
+        socket.end()
+      },
+      data() {},
+    },
+  })
+  return { listener, accepted: () => accepted }
+}
+
+const execute = Effect.fn("ShellNetworkTest.execute")(function* (
+  root: string,
+  mode: Profile["network"]["mode"],
+  port: number,
+) {
+  const info = yield* ShellTool
+  const shell = yield* info.init()
+  return yield* runSandbox(profile(root, mode), shell.execute({ command: `/usr/bin/nc -v 127.0.0.1 ${port}` }, ctx))
+})
+
+describe("model shell network integration", () => {
+  test.skipIf(process.platform !== "darwin")(
+    "enforces allow and deny profiles through the actual shell tool and process spawner",
+    async () => {
+      const effect = Effect.gen(function* () {
+        const root = yield* tmpdirScoped()
+        const allowed = server()
+        const denied = server()
+        yield* Effect.addFinalizer(() =>
+          Effect.sync(() => {
+            allowed.listener.stop(true)
+            denied.listener.stop(true)
+          }),
+        )
+
+        const allow = yield* execute(root, "allow", allowed.listener.port).pipe(provideInstance(root))
+        const deny = yield* execute(root, "deny", denied.listener.port).pipe(provideInstance(root))
+        expect(allow.output).toContain("model-shell-network-ok")
+        expect(allow.metadata.exit).toBe(0)
+        expect(allowed.accepted()).toBe(1)
+        expect(deny.output).toContain("Operation not permitted")
+        expect(deny.metadata.exit).not.toBe(0)
+        expect(denied.accepted()).toBe(0)
+      })
+
+      await Effect.runPromise(Effect.scoped(effect.pipe(Effect.provide(layer))))
+    },
+  )
+})
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 53db5ebe02..e57b353091 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -1541,6 +1541,7 @@ export type Config = {
     primary_tools?: Array<string>
     continue_loop_on_deny?: boolean
     sandbox?: boolean
+    sandbox_restrict_network?: boolean
     mcp_timeout?: number
     policies?: Array<ConfigV2ExperimentalPolicy>
   }
diff --git a/packages/sdk/openapi.json b/packages/sdk/openapi.json
index a0f3ffca47..2772ddb796 100644
--- a/packages/sdk/openapi.json
+++ b/packages/sdk/openapi.json
@@ -21014,6 +21014,14 @@
               "continue_loop_on_deny": {
                 "type": "boolean"
               },
+              "sandbox": {
+                "type": "boolean",
+                "description": "Run agent tools inside a sandbox that restricts writes to project and Kilo state directories and can restrict outbound network access"
+              },
+              "sandbox_restrict_network": {
+                "type": "boolean",
+                "description": "Restrict outbound network access for model-originated commands and first-party HTTP tools; local MCP servers and plugin hooks are not covered (default: true)"
+              },
               "mcp_timeout": {
                 "type": "integer",
                 "exclusiveMinimum": 0
diff --git a/script/check-model-tool-network.ts b/script/check-model-tool-network.ts
new file mode 100644
index 0000000000..df3b3ecd1e
--- /dev/null
+++ b/script/check-model-tool-network.ts
@@ -0,0 +1,112 @@
+#!/usr/bin/env bun
+// kilocode_change - new file
+
+import path from "node:path"
+
+const root = path.resolve(import.meta.dir, "..")
+const source = path.join(root, "packages", "opencode", "src")
+const dirs = ["tool", "kilocode/tool"]
+const checks = [
+  { name: "direct fetch", pattern: /\b(?:globalThis\.)?fetch\s*\(/g },
+  { name: "raw FetchHttpClient layer", pattern: /\bFetchHttpClient\.layer\b/g },
+  { name: "direct Bun socket", pattern: /\bBun\.(?:connect|udpSocket)\s*\(/g },
+  {
+    name: "raw network module",
+    pattern:
+      /\bfrom\s+["'](?:(?:node:)?(?:http|https|http2|net|tls|dgram)(?:\/[^"']*)?|(?:undici|axios|got)(?:\/[^"']*)?)["']/g,
+  },
+  {
+    name: "dynamic network module",
+    pattern:
+      /\b(?:require|import)\s*\(\s*["'](?:(?:node:)?(?:http|https|http2|net|tls|dgram)(?:\/[^"']*)?|(?:undici|axios|got)(?:\/[^"']*)?)["']/g,
+  },
+  {
+    name: "ad hoc network client",
+    pattern:
+      /\bnew\s+(?:WarpGrepClient|OpenAI|QdrantClient|BedrockRuntimeClient|WebSocket|EventSource|StreamableHTTPClientTransport|SSEClientTransport)\s*\(/g,
+  },
+]
+const allow: Record<string, { count: number; reason: string }> = {
+  "tool/warpgrep.ts:ad hoc network client": {
+    count: 1,
+    reason: "opaque SDK traffic is denied by the common executeTool network boundary",
+  },
+}
+const hits: Array<{ file: string; name: string; line: number }> = []
+const glob = new Bun.Glob("**/*.ts")
+
+for (const dir of dirs) {
+  for (const file of glob.scanSync({ cwd: path.join(source, dir), onlyFiles: true })) {
+    const rel = path.posix.join(dir, file.replaceAll("\\", "/"))
+    const text = await Bun.file(path.join(source, rel)).text()
+    for (const check of checks) {
+      for (const match of text.matchAll(check.pattern)) {
+        hits.push({
+          file: rel,
+          name: check.name,
+          line: text.slice(0, match.index ?? 0).split("\n").length,
+        })
+      }
+    }
+  }
+}
+
+const invalid = hits.filter((hit) => !allow[`${hit.file}:${hit.name}`])
+const drift = Object.entries(allow).flatMap(([key, entry]) => {
+  const split = key.lastIndexOf(":")
+  const file = key.slice(0, split)
+  const name = key.slice(split + 1)
+  const count = hits.filter((hit) => hit.file === file && hit.name === name).length
+  if (count === entry.count) return []
+  return [`  packages/opencode/src/${file}: expected ${entry.count} ${name} site(s), found ${count} (${entry.reason})`]
+})
+
+const registry = await Bun.file(path.join(source, "tool", "registry.ts")).text()
+const session = await Bun.file(path.join(source, "session", "tools.ts")).text()
+const mcp = await Bun.file(path.join(source, "mcp", "index.ts")).text()
+const structure = [
+  ...(!registry.includes("Layer.provide(ToolNetwork.httpLayer)")
+    ? ["  tool/registry.ts must provide the policy-aware ToolNetwork HTTP layer"]
+    : []),
+  ...(registry.includes("FetchHttpClient.layer")
+    ? ["  tool/registry.ts must not provide a raw FetchHttpClient layer"]
+    : []),
+  ...(!registry.includes("ToolNetwork.builtin(result)")
+    ? ["  tool/registry.ts must distinguish built-in tools from untrusted custom tools"]
+    : []),
+  ...(!session.includes("SandboxPolicy.executeTool(item,")
+    ? ["  session/tools.ts must route built-in and custom tools through executeTool"]
+    : []),
+  ...(!mcp.includes("SandboxNetwork.remote(tool)")
+    ? ["  mcp/index.ts must classify remote MCP delegated authority"]
+    : []),
+  ...(!session.includes("SandboxPolicy.executeMcp(")
+    ? ["  session/tools.ts must route MCP delegated authority through executeMcp"]
+    : []),
+]
+
+if (invalid.length > 0 || drift.length > 0 || structure.length > 0) {
+  if (invalid.length > 0) {
+    console.error("Found model-tool network clients that bypass the sandbox capability:")
+    for (const hit of invalid) console.error(`  packages/opencode/src/${hit.file}:${hit.line} (${hit.name})`)
+    console.error("")
+  }
+  if (drift.length > 0) {
+    console.error("Classified model-tool network exceptions no longer match source:")
+    for (const item of drift) console.error(item)
+    console.error("")
+  }
+  if (structure.length > 0) {
+    console.error("Model-tool network boundary wiring is incomplete:")
+    for (const item of structure) console.error(item)
+    console.error("")
+  }
+  console.error(
+    "Use the @kilocode/sandbox network capability or classify an opaque client at the common tool boundary.",
+  )
+  process.exit(1)
+}
+
+console.log(
+  `check-model-tool-network: ${hits.length} classified client site(s), policy-aware tool and MCP boundaries verified.`,
+)