diff --git a/.coderabbit.config.ts b/.coderabbit.config.ts
new file mode 100644
index 000000000000..52f257921836
--- /dev/null
+++ b/.coderabbit.config.ts
@@ -0,0 +1,29 @@
+import { defineConfig } from "@coderabbitai/config";
+
+export default defineConfig({
+  reviews: {
+    high_level_summary: false,
+    review_status: false,
+    auto_review: {
+      enabled: true,
+    },
+    path_filters: [
+      // Vendored read-only reference checkouts of upstream Effect and Alchemy
+      // (see scripts/lib/reference-repos.ts). Nothing imports from them.
+      "!.repos/**",
+    ],
+    path_instructions: [
+      {
+        path: "{apps,packages,infra}/**/*.ts",
+        instructions: "Hold changed code to the rules in docs/internals/effect-services.md.",
+      },
+    ],
+  },
+  knowledge_base: {
+    code_guidelines: {
+      filePatterns: [
+        { files: "docs/internals/effect-services.md", applyTo: "{apps,packages,infra}/**/*.ts" },
+      ],
+    },
+  },
+});
diff --git a/.coderabbit.yaml b/.coderabbit.yaml
deleted file mode 100644
index bf28b1b342d2..000000000000
--- a/.coderabbit.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-reviews:
-  high_level_summary: false
-  review_status: false
-  auto_review:
-    enabled: true
-  path_filters:
-    # Vendored read-only reference checkouts of upstream Effect and Alchemy
-    # (see scripts/lib/reference-repos.ts). Nothing imports from them.
-    - "!.repos/**"
diff --git a/knip.jsonc b/knip.jsonc
index 8865bf58869c..5ba7414158a7 100644
--- a/knip.jsonc
+++ b/knip.jsonc
@@ -8,7 +8,11 @@
     ".": {
       // Keep vendored reference repositories outside the root project.
       "project": ["*.{js,mjs,cjs,ts,mts,cts}", ".github/**/*.cjs"],
-      "entry": [".github/scripts/thread-transfer-report.cjs"],
+      "entry": [
+        // CodeRabbit loads its configuration by filename.
+        ".coderabbit.config.ts",
+        ".github/scripts/thread-transfer-report.cjs",
+      ],
       "vite": { "entry": [".github/**/*.test.cjs"] },
       "vitest": { "entry": [".github/**/*.test.cjs"] },
     },
diff --git a/package.json b/package.json
index e4b92d711fb9..559801c550c7 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
     "sync:repos": "node scripts/sync-reference-repos.ts"
   },
   "devDependencies": {
+    "@coderabbitai/config": "1.1.0",
     "@effect/tsgo": "catalog:",
     "@shadcn/lint": "0.1.5",
     "@types/node": "catalog:",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 56f1bfa60f86..39ebcca645f4 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -124,6 +124,9 @@ importers:
 
   .:
     devDependencies:
+      '@coderabbitai/config':
+        specifier: 1.1.0
+        version: 1.1.0
       '@effect/tsgo':
         specifier: 'catalog:'
         version: 0.41.0
@@ -2073,6 +2076,9 @@ packages:
   '@cloudflare/workers-types@5.20261004.1':
     resolution: {integrity: sha512-K9D4/Y6bSIDNYFzjqzFMNoWK99pLgfgFxqSa76kfW++3VCkTSzJbzsQRffir366G3kmNyjoigC6ekp7DxIkxkw==}
 
+  '@coderabbitai/config@1.1.0':
+    resolution: {integrity: sha512-NvQKaoOD7fWb7lMKhid57ABVlIBSczw/S+ePk5YvoPuWdrDkyY+PWdqVtq3TRq7VY8f3SNRlMFjmAtXVab66pw==}
+
   '@connectrpc/connect-web@1.7.0':
     resolution: {integrity: sha512-qyP0YOnUPRWwCc/VfsoydMJvkb7EyUPr2q9sHgBuJzbADjiqck1gKH5V5ZPzPhTLBvmz5UvG+wiZ5sMRQHU1MQ==}
     peerDependencies:
@@ -11520,6 +11526,9 @@ packages:
   zod@4.4.3:
     resolution: {integrity: sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==}
 
+  zod@4.5.4:
+    resolution: {integrity: sha512-sC95tT5iHHH9gtpj6A81kh+NEaRAUFN+qlUPDUbRfOMvNf5QCBqsb3WgvnpVtK5Y+4UfA6KqufotuTvMGiTlsA==}
+
   zod@4.6.5:
     resolution: {integrity: sha512-v5l/aFXZQeai4awLbOpSoHecE9UiMrnfx75tEXLjNonXVARxQ5mOeipTjROUchszUNCqnE+hqAMujRsRHsut2Q==}
 
@@ -12774,6 +12783,10 @@ snapshots:
 
   '@cloudflare/workers-types@5.20261004.1': {}
 
+  '@coderabbitai/config@1.1.0':
+    dependencies:
+      zod: 4.5.4
+
   '@connectrpc/connect-web@1.7.0(@bufbuild/protobuf@1.10.0)(@connectrpc/connect@1.7.0(@bufbuild/protobuf@1.10.0))':
     dependencies:
       '@bufbuild/protobuf': 1.10.0
@@ -22863,6 +22876,8 @@ snapshots:
 
   zod@4.4.3: {}
 
+  zod@4.5.4: {}
+
   zod@4.6.5: {}
 
   zustand@5.0.14(@types/react@19.3.0)(react@19.2.6)(use-sync-external-store@1.6.0(react@19.2.6)):