diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 1a419e32fb3..63e4fb67cdf 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -96,7 +96,12 @@ jobs:
       - uses: actions/upload-artifact@v4
         with:
           name: kilo-cli
-          path: packages/opencode/dist
+          path: |
+            packages/opencode/dist
+            !packages/opencode/dist/**/*.map
+          # Binaries don't compress meaningfully; skip the ~60s zstd pass and
+          # reduce the chance of partial-extract bugs on the download side.
+          compression-level: 0
 
     outputs:
       version: ${{ needs.version.outputs.version }}
diff --git a/packages/opencode/script/build.ts b/packages/opencode/script/build.ts
index d54830e3914..2b2cd3149ff 100755
--- a/packages/opencode/script/build.ts
+++ b/packages/opencode/script/build.ts
@@ -219,7 +219,9 @@ for (const item of targets) {
     conditions: ["browser"],
     tsconfig: "./tsconfig.json",
     plugins: [plugin],
-    sourcemap: "external", // kilocode_change
+    // kilocode_change start - skip sourcemaps for release builds (each .js.map adds ~50 MB per target → ~600 MB total)
+    sourcemap: Script.release ? "none" : "external",
+    // kilocode_change end
     external: ["node-gyp", ...LanceDBRuntime.external], // kilocode_change
     format: "esm",
     minify: true,