Kyle Carberry ddfe630757 refactor(chatd): replace fantasy.Agent with custom agent loop (#22507) ...

## Summary

Replaces fantasy's `Agent` abstraction with a direct step loop calling
`LanguageModel.Stream()`. Fantasy is retained as the provider
abstraction layer (streaming parsers, types, tool schema) but we no
longer use `fantasy.Agent`, `AgentStreamCall`, `AgentResult`, or
`StepResult`.

## Problems solved

| Problem | Before | After |
|---|---|---|
| **Sentinel prompt hack** | fantasy.Agent requires non-empty Prompt →
UUID sentinel generated and stripped in PrepareStep | Messages passed
directly to `model.Stream()` |
| **Discarded PersistStep errors** | `_ = opts.OnStepFinish(result)`
silently swallows errors | Errors propagate directly from
`PersistStep()` |
| **Shadow draft state** | ~160 LOC tracking content in parallel because
fantasy doesn't expose in-progress content on interruption |
`stepResult` owns content directly; `flushActiveState()` is trivial |
| **Nested retry layers** | fantasy's 2-attempt retry nested inside
chatretry's indefinite retry | Single `chatretry.Retry` layer |
| **Callback-mediated compaction** | Mutex + boolean flag + coordination
between OnStepFinish/PrepareStep callbacks | Inline `if` statement
between steps |
| **Duplicate compaction paths** | `compactStep()` + `maybeCompact()`
sharing ~80% logic | Single `tryCompact()` function |

## Changes

### `coderd/chatd/chatloop/chatloop.go` — Rewritten
- **Removed**: `fantasy.NewAgent()`, `AgentStreamCall`, sentinel prompt,
shadow draft state (~160 LOC of closures), `compactedMu`/`compacted`
flag, `PrepareStepResult`
- **Added**: `stepResult` struct, `processStepStream()` (stream
consumer), `executeTools()` (sequential tool execution),
`flushActiveState()` (interrupt handling), `buildToolDefinitions()`,
`toResponseMessages()`
- **Changed**: `Run()` return type from `(*fantasy.AgentResult, error)`
to `error` (callers already discarded the result)
- **Preserved**: Anthropic prompt caching, reasoning title extraction,
`extractContextLimit()`, `ErrInterrupted` semantics

### `coderd/chatd/chatloop/compaction.go` — Simplified
- Merged `compactStep()` + `maybeCompact()` → single `tryCompact()`
- Removed `[]StepResult` parameter from `generateCompactionSummary()`
(caller provides complete message list)
- Kept helper functions: `normalizedCompactionConfig`,
`contextTokensFromUsage`, `resolveContextLimit`, `shouldCompact`

### `coderd/chatd/chatd.go` — Caller updates
- Removed `AgentStreamCall` construction
- Changed `_, err = chatloop.Run(...)` to `err = chatloop.Run(...)`
- Model parameters moved from `AgentStreamCall` fields to `RunOptions`
fields

### Tests — 4 new tests
- `MidLoopCompactionReloadsMessages` — compaction fires mid-loop,
messages reloaded
- `PostRunCompactionSkippedAfterMidLoop` — no double compaction
- `MultiStepToolExecution` — tools execute between steps, results feed
next step
- `PersistStepErrorPropagates` — persistence errors propagate (was
silently discarded)

2026-03-02 18:51:57 -05:00

..

agentapi

feat: add UpdateAppStatus to the workspace agent API (#22219)

2026-02-24 13:26:55 +04:00

agentmetrics

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

aibridge

feat: use coder specific header for aibridge authentication from AI proxy (#21590)

2026-01-21 19:06:19 +00:00

apidoc

feat(chats): archive chats instead of hard-deleting them (#22406)

2026-02-27 16:46:19 -05:00

apikey

fix: initialize API key LastUsed to Unix epoch instead of zero time (#22327)

2026-03-02 16:02:01 +01:00

appearance

fix: make cli respect deployment --docs-url (#14568)

2024-09-18 21:47:53 +10:00

audit

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

autobuild

fix: use "idle timeout" as task auto-pause reason (#22287)

2026-02-24 16:45:56 +00:00

awsidentity

fix: add new aws regions to instance identity (#10434)

2023-10-30 19:44:29 +00:00

azureidentity

chore: update azure certs (#21265)

2025-12-15 13:44:44 -09:00

boundaryusage

fix: make boundary usage telemetry collection atomic (#21907)

2026-02-06 09:52:17 -07:00

cachecompress

feat: add cachecompress package to compress static files for HTTP (#21915)

2026-02-06 10:12:58 +04:00

chatd

refactor(chatd): replace fantasy.Agent with custom agent loop (#22507)

2026-03-02 18:51:57 -05:00

coderdtest

fix: avoid derp-related panic during wsproxy registration (#22322)

2026-02-27 00:07:14 +11:00

connectionlog

fix: avoid connection logging crashes in agent (#20307)

2025-10-16 01:56:43 +11:00

cryptokeys

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

database

fix: use cursor-based query for chat stream notifications (#22510)

2026-03-02 16:31:04 -05:00

devtunnel

chore: remove unnecessary loop variable captures (#22180)

2026-02-19 09:02:19 +00:00

dynamicparameters

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

entitlements

feat: add Prometheus metrics for license warnings and errors (#21749)

2026-01-29 13:50:15 +01:00

externalauth

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

files

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

gitsshkey

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

healthcheck

chore: improve healthcheck timeout message (#21520)

2026-01-15 16:37:05 +00:00

httpapi

fix(coderd): harden OAuth2 provider security (#22194)

2026-02-23 12:18:44 +01:00

httpmw

chore(db): remove workspace_agent_id from chats table (#22442)

2026-02-28 16:46:51 -05:00

idpsync

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

jobreaper

fix: exclude provisioner_state from workspace_build_with_user view (#22159)

2026-02-23 22:46:17 -06:00

jwtutils

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

mcp

fix(coderd): harden OAuth2 provider security (#22194)

2026-02-23 12:18:44 +01:00

metricscache

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

notifications

feat: notify on task auto pause, manual pause and manual resume (#22050)

2026-02-18 16:30:16 +00:00

oauth2provider

fix(coderd): harden OAuth2 provider security (#22194)

2026-02-23 12:18:44 +01:00

oauthpki

fix(coderd): support string type for oidc response's expires_in json property (#20152)

2025-10-15 17:37:37 +00:00

portsharing

fix: properly convert max port share level for oss (#13261)

2024-05-13 14:37:51 -04:00

pproflabel

chore: add usage tracking package (#19095)

2025-08-16 01:31:00 +10:00

prebuilds

chore: remove unnecessary loop variable captures (#22180)

2026-02-19 09:02:19 +00:00

prometheusmetrics

fix(coderd): add organization_name label to insights Prometheus metrics (#22296)

2026-02-25 08:58:50 +00:00

promoauth

fix!: remove deprecated prometheus metrics (#21788)

2026-01-30 13:30:06 +01:00

provisionerdserver

fix: exclude provisioner_state from workspace_build_with_user view (#22159)

2026-02-23 22:46:17 -06:00

provisionerkey

chore!: ensure consistent secret token generation and hashing (#20388)

2025-10-23 15:38:49 -05:00

proxyhealth

feat: add csp headers for embedded apps (#18374)

2025-06-17 09:00:32 -08:00

pubsub

feat: add diff_status_change event to /chats/watch pubsub stream (#22419)

2026-02-27 18:06:54 -05:00

rbac

feat(rbac): add AsChatd subject to replace AsSystemRestricted in chatd (#22487)

2026-03-02 15:57:04 +00:00

render

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

runtimeconfig

chore(coderd/runtimeconfig): remove dbmem from tests (#18790)

2025-07-08 14:31:05 +00:00

schedule

chore: remove unnecessary loop variable captures (#22180)

2026-02-19 09:02:19 +00:00

searchquery

feat: add AI Bridge request logs model filter (#22230)

2026-02-26 02:40:45 +11:00

taskname

fix(stringutil): operate on runes instead of bytes in Truncate (#22388)

2026-02-27 17:46:37 +00:00

telemetry

feat: add telemetry for task lifecycle events (#21922)

2026-02-24 17:04:42 +00:00

testdata

feat: add flag to disable template insights (#20940)

2025-12-14 03:00:03 +00:00

tracing

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

updatecheck

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

usage

chore: add unknown usage event type error (#19436)

2025-08-22 16:32:35 +10:00

userpassword

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

util

fix(stringutil): operate on runes instead of bytes in Truncate (#22388)

2026-02-27 17:46:37 +00:00

webpush

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

workspaceapps

fix: allow sharing ports >9999 (#22273)

2026-02-24 23:46:43 -06:00

workspacestats

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

wsbuilder

fix: mark presets as validation_failed to prevent endless prebuild retries (#22085)

2026-02-27 14:26:48 +00:00

wspubsub

feat: add app status tracking to the backend (#17163)

2025-03-31 10:55:44 -04:00

activitybump_test.go

chore: distinct operations for provisioner's 'parse', 'init', 'plan', 'apply', 'graph' (#21064)

2025-12-15 11:26:41 -06:00

aitasks_internal_test.go

fix: set codersdk.Task current_state during task initialization (#20692)

2025-11-17 13:24:12 +00:00

aitasks_test.go

test(coderd): remove provisioner daemon from SendToNonActiveStates test (#22298)

2026-02-25 13:14:32 +02:00

aitasks.go

feat: add experimental agents support (#22290)

2026-02-27 16:50:56 +00:00

apikey_scopes_validation_test.go

feat: add multi-scope support to API keys (#19917)

2025-09-26 11:56:34 +02:00

apikey_test.go

feat(coderd): filter expired API tokens server-side (#22263)

2026-02-24 15:27:03 +00:00

apikey.go

feat(coderd): filter expired API tokens server-side (#22263)

2026-02-24 15:27:03 +00:00

apiroot.go

chore: add /v2 to import module path (#9072)

2023-08-18 18:55:43 +00:00

audit_internal_test.go

chore: add sql filter to fetching audit logs (#14070)

2024-08-01 12:07:19 -05:00

audit_test.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

audit.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

authorize_test.go

feat: add an organization member permission level (#19953)

2025-10-27 17:14:16 -06:00

authorize.go

feat: add experimental agents support (#22290)

2026-02-27 16:50:56 +00:00

chats_test.go

fix(chats): archive chat tree with single query instead of loop (#22496)

2026-03-02 12:00:00 -05:00

chats.go

fix: use cursor-based query for chat stream notifications (#22510)

2026-03-02 16:31:04 -05:00

client_test.go

chore: add /v2 to import module path (#9072)

2023-08-18 18:55:43 +00:00

coderd_internal_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

coderd_test.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

coderd.go

feat(agents): add desktop notifications via VAPID web push (#22454)

2026-02-28 23:40:17 -05:00

csp.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

debug_test.go

chore: improve healthcheck timeout message (#21520)

2026-01-15 16:37:05 +00:00

debug.go

chore: improve healthcheck timeout message (#21520)

2026-01-15 16:37:05 +00:00

deployment_test.go

fix(coderd): mark provisioner daemon psk as secret (#12322)

2024-02-27 16:33:32 +00:00

deployment.go

chore: remove chats experiment (#18535)

2025-06-25 13:03:32 +00:00

deprecated.go

chore!: remove deprecated agent v1 routes (#13486)

2024-06-11 12:22:59 +10:00

experiments_test.go

chore: revert dynamic params as a safe experiment (#17510)

2025-04-22 16:21:15 +00:00

experiments.go

fix: do not warn on valid known experiments (#18514)

2025-06-24 09:14:41 +01:00

externalauth_test.go

feat(coderd/rbac): make organization-member a per-org system custom role (#21359)

2026-01-12 18:19:19 -08:00

externalauth.go

feat!: support PKCE in the oauth2 client's auth/exchange flow (#21215)

2025-12-15 17:41:47 +00:00

files_test.go

ci: improve 'tfail in goroutine' ruleguard rule (#19682)

2025-09-04 14:28:29 +10:00

files.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

gitsshkey_test.go

chore: distinct operations for provisioner's 'parse', 'init', 'plan', 'apply', 'graph' (#21064)

2025-12-15 11:26:41 -06:00

gitsshkey.go

feat: add API key scope to restrict access to user data (#17692)

2025-05-15 15:32:52 +01:00

inboxnotifications_internal_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

inboxnotifications_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

inboxnotifications.go

fix(coderd): ensure inbox WebSocket is closed when client disconnects (#21652)

2026-01-26 09:24:45 +00:00

initscript_test.go

feat(coderd): add support for external agents to API's and provisioner (#19286)

2025-08-19 10:41:33 +02:00

initscript.go

feat(coderd): add support for external agents to API's and provisioner (#19286)

2025-08-19 10:41:33 +02:00

insights_internal_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

insights_test.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

insights.go

chore: update golang to 1.24.1 (#17035)

2025-03-26 01:56:39 -05:00

latencycheck.go

chore: add prometheus timing to latency endpoint (#7742)

2023-06-06 10:26:13 -05:00

mcp_http.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

members_test.go

feat: add endpoint to fetch singular org member (#21732)

2026-02-03 12:48:25 -06:00

members.go

feat: add endpoint to fetch singular org member (#21732)

2026-02-03 12:48:25 -06:00

notifications_test.go

chore: return 404, not 400 if missing or authz deny (#22069)

2026-02-13 08:19:07 -06:00

notifications.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

oauth2_error_compliance_test.go

refactor: add RFC-compliant enum types and use SDK as source of truth (#21468)

2026-01-15 12:41:28 +03:00

oauth2_metadata_test.go

refactor: add RFC-compliant enum types and use SDK as source of truth (#21468)

2026-01-15 12:41:28 +03:00

oauth2_metadata_validation_test.go

refactor: add RFC-compliant enum types and use SDK as source of truth (#21468)

2026-01-15 12:41:28 +03:00

oauth2_security_test.go

feat: implement OAuth2 dynamic client registration (RFC 7591/7592) (#18645)

2025-07-03 18:33:47 +02:00

oauth2_test.go

fix(coderd): harden OAuth2 provider security (#22194)

2026-02-23 12:18:44 +01:00

oauth2.go

feat: implement oauth2 RFC 7009 token revocation endpoint (#20362)

2025-10-22 15:18:42 -05:00

organizations_test.go

chore: protect organization endpoints with license (#14001)

2024-07-25 16:07:53 -05:00

organizations.go

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

pagination_test.go

feat: add connectionlogs API (#18628)

2025-07-15 14:55:34 +10:00

pagination.go

feat: add connectionlogs API (#18628)

2025-07-15 14:55:34 +10:00

parameters_test.go

feat: archive modules in size order until limit is hit (#21773)

2026-02-02 09:03:18 -06:00

parameters.go

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

presets_test.go

chore: remove unnecessary loop variable captures (#22180)

2026-02-19 09:02:19 +00:00

presets.go

feat: support icon and description in preset (#18977)

2025-07-28 15:02:26 +01:00

provisionerdaemons_test.go

feat: add filtering options to provisioners list (#19378)

2025-08-21 16:03:34 -04:00

provisionerdaemons.go

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

provisionerjobs_internal_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

provisionerjobs_test.go

chore: fix api param name (#20172)

2025-10-06 13:58:37 +02:00

provisionerjobs.go

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

roles_test.go

chore: protect organization endpoints with license (#14001)

2024-07-25 16:07:53 -05:00

roles.go

feat(coderd/rbac): make organization-member a per-org system custom role (#21359)

2026-01-12 18:19:19 -08:00

scopes_catalog_api_test.go

feat: add external API key scopes (#19916)

2025-09-26 11:43:32 +02:00

scopes_catalog.go

feat: add external API key scopes (#19916)

2025-09-26 11:43:32 +02:00

tailnet_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

tailnet.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

templates_test.go

fix: hide "Create Workspace" button for deleted templates (#22092)

2026-02-13 19:44:50 -05:00

templates.go

fix: hide "Create Workspace" button for deleted templates (#22092)

2026-02-13 19:44:50 -05:00

templateversions_test.go

test: template import should never complete, use Plan over apply (#21895)

2026-02-03 10:16:53 -06:00

templateversions.go

feat: add link for viewing raw build logs in workspace and template build jobs (#21727)

2026-02-03 09:45:23 +00:00

updatecheck_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

updatecheck.go

chore: add /v2 to import module path (#9072)

2023-08-18 18:55:43 +00:00

userauth_test.go

chore: optionally prefix authentication related cookies (#22148)

2026-02-20 09:01:00 -06:00

userauth.go

chore: optionally prefix authentication related cookies (#22148)

2026-02-20 09:01:00 -06:00

users_test.go

chore: return 404, not 400 if missing or authz deny (#22069)

2026-02-13 08:19:07 -06:00

users.go

chore(coderd/database): remove deprecated db2sdk.List(Lazy)? methods (#21902)

2026-02-03 17:52:07 +00:00

webpush_test.go

fix(coderd): fix error handling in deleteUserWebpushSubscription (#22500)

2026-03-02 21:11:20 +00:00

webpush.go

fix(coderd): fix error handling in deleteUserWebpushSubscription (#22500)

2026-03-02 21:11:20 +00:00

workspaceagentportshare_test.go

feat(coderd/rbac): make organization-member a per-org system custom role (#21359)

2026-01-12 18:19:19 -08:00

workspaceagentportshare.go

docs: fix swagger documentation for DELETE port share endpoint (#18426)

2025-06-18 14:07:53 +00:00

workspaceagents_internal_test.go

perf: reduce number of queries made by /api/v2/workspaceagents/{id} (#21522)

2026-01-19 12:36:33 +00:00

workspaceagents_test.go

fix: use time.Equal() for external auth token expiry comparison (#22295)

2026-02-25 08:45:00 -07:00

workspaceagents.go

feat: add experimental agents support (#22290)

2026-02-27 16:50:56 +00:00

workspaceagentsrpc_internal_test.go

test: use not before in TestAgentConnectionMonitor_* (#21332)

2025-12-22 10:21:39 +04:00

workspaceagentsrpc_test.go

fix(coderd): add role param to agent RPC to prevent false connectivity (#22052)

2026-02-18 09:44:06 +01:00

workspaceagentsrpc.go

fix(coderd): add role param to agent RPC to prevent false connectivity (#22052)

2026-02-18 09:44:06 +01:00

workspaceapps_test.go

chore: remove unnecessary redeclarations in for loops (#18440)

2025-06-20 13:16:55 -06:00

workspaceapps.go

feat: add multi-scope support to API keys (#19917)

2025-09-26 11:56:34 +02:00

workspacebuilds_test.go

feat: add link for viewing raw build logs in workspace and template build jobs (#21727)

2026-02-03 09:45:23 +00:00

workspacebuilds.go

fix: exclude provisioner_state from workspace_build_with_user view (#22159)

2026-02-23 22:46:17 -06:00

workspaceproxies_test.go

…

workspaceproxies.go

…

workspaceresourceauth_test.go

chore: distinct operations for provisioner's 'parse', 'init', 'plan', 'apply', 'graph' (#21064)

2025-12-15 11:26:41 -06:00

workspaceresourceauth.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00

workspaces_test.go

chore: move Shared Workspaces from experiments to beta (#22206)

2026-02-23 08:30:32 -08:00

workspaces.go

feat: add experimental agents support (#22290)

2026-02-27 16:50:56 +00:00

workspaceupdates_test.go

chore: update testutil chan helpers (#17408)

2025-04-16 10:37:09 -06:00

workspaceupdates.go

chore: arrange imports in a standard way (#21452)

2026-01-08 15:24:11 +04:00