diff --git a/.changeset/runner-typecheck-2917.md b/.changeset/runner-typecheck-2917.md
new file mode 100644
index 0000000000..e52c02c641
--- /dev/null
+++ b/.changeset/runner-typecheck-2917.md
@@ -0,0 +1,55 @@
+---
+"@object-ui/runner": patch
+---
+
+fix(runner): type-check the package at all, and fix the `DataSource` contract violation that hid behind a broken import (#2917)
+
+`@object-ui/runner` was the worst-covered package in the repo: `build` is
+`vite build` (transpile only), it had no `type-check` script, and — uniquely —
+**no `tsconfig.json` at all**. Nothing had ever type-checked it, despite it being
+a published package.
+
+**It was not broken at runtime.** The two bad imports were `import type`, so they
+were erased before they could fail, and the one value import
+(`emulateBatchTransaction`) does exist. `MockDataSource` is also unreferenced
+anywhere in the repo. So this is a correctness and reference-quality fix, not an
+outage.
+
+**What the missing check actually hid.** `DataSource` and
+`BatchTransactionOperation` were imported from `@object-ui/core`, which does not
+export them — they live in `@object-ui/types`. Because that import never
+resolved, `class MockDataSource implements DataSource` was silently a no-op, and
+three separate commits maintained the class *as if* it were being verified
+(`62b9ab510` added `batchTransaction`, `09d9669c7` made `getObjectSchema`
+required, `5527388b0` added input validation). With the `implements` clause
+inert, a real contract violation survived all three:
+
+```ts
+async find(resource: string, params?: any): Promise<any[]> { return []; }
+```
+
+`DataSource.find` returns a `QueryResult` envelope, not a bare array. Anyone
+copying this mock as the starting point for their own adapter — which is exactly
+what its doc comment invites — would hand every consumer an array where `.data`
+and `.total` are `undefined`. Now typed as `Promise<QueryResult>` and returning
+`{ data: [], total: 0 }`.
+
+Also in this change:
+
+- `packages/runner/tsconfig.json` added, mirroring `apps/console` rather than the
+  library packages: `runner` is a Vite app, so it wants `bundler` resolution,
+  `allowImportingTsExtensions` (for `./App.tsx`) and `types: ["vite/client"]`
+  (for `import.meta.glob` in `MetadataLoader` and the `./index.css` side-effect
+  import). Keeping it standalone instead of extending the root config also means
+  it never inherits the root `paths`, so workspace deps resolve through built
+  `.d.ts` and the TS6059 `rootDir` class of error cannot appear.
+- unused parameters prefixed with `_` (6x in `mockDataSource`), and an unused
+  `Circle` icon import dropped from `LayoutRenderer`.
+- `"type-check": "tsc --noEmit"` added, and the package's `DEBT` entry deleted
+  from `scripts/check-type-check-coverage.mjs`. Coverage goes 35 -> 36 of 45 and
+  outstanding errors 46 -> 32.
+
+Verified the gate genuinely covers the package now, rather than trusting the
+green: injecting a type error into `runner/src/App.tsx` makes `pnpm type-check`
+fail with `Failed: @object-ui/runner#type-check`, which was impossible before
+this change.
diff --git a/packages/runner/package.json b/packages/runner/package.json
index 175240bd87..9c8d803125 100644
--- a/packages/runner/package.json
+++ b/packages/runner/package.json
@@ -16,6 +16,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vite build",
+    "type-check": "tsc --noEmit",
     "preview": "vite preview",
     "test": "vitest run"
   },
diff --git a/packages/runner/src/LayoutRenderer.tsx b/packages/runner/src/LayoutRenderer.tsx
index ea848d649e..6e41eb4729 100644
--- a/packages/runner/src/LayoutRenderer.tsx
+++ b/packages/runner/src/LayoutRenderer.tsx
@@ -12,7 +12,6 @@ import {
   Bell,
   Box,
   ChevronDown,
-  Circle,
   Menu,
   Moon,
   Search,
diff --git a/packages/runner/src/lib/mockDataSource.ts b/packages/runner/src/lib/mockDataSource.ts
index 717d61f4ff..14d4f524c3 100644
--- a/packages/runner/src/lib/mockDataSource.ts
+++ b/packages/runner/src/lib/mockDataSource.ts
@@ -6,7 +6,12 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import type { DataSource, BatchTransactionOperation } from '@object-ui/core';
+import type {
+  DataSource,
+  BatchTransactionOperation,
+  QueryParams,
+  QueryResult,
+} from '@object-ui/types';
 import { emulateBatchTransaction } from '@object-ui/core';
 
 /**
@@ -14,12 +19,15 @@ import { emulateBatchTransaction } from '@object-ui/core';
  * 在真实项目中，你会在这里使用 fetch/axios 调用你的 API。
  */
 export class MockDataSource implements DataSource {
-  async find(resource: string, params?: any): Promise<any[]> {
+  async find(resource: string, params?: QueryParams): Promise<QueryResult> {
     console.log(`[DataSource] Querying ${resource}`, params);
-    return [];
+    // `find` returns an envelope, not a bare array — consumers read `.data`
+    // and `.total` (see QueryResult). Returning `[]` here would leave every
+    // caller with `undefined` data.
+    return { data: [], total: 0 };
   }
 
-  async findOne(resource: string, id: string): Promise<any> {
+  async findOne(_resource: string, _id: string): Promise<any> {
     return null;
   }
 
@@ -33,11 +41,11 @@ export class MockDataSource implements DataSource {
     return { id: Math.random().toString(), ...data };
   }
 
-  async update(resource: string, id: string, data: any): Promise<any> {
+  async update(_resource: string, _id: string, data: any): Promise<any> {
     return data;
   }
 
-  async delete(resource: string, id: string): Promise<any> {
+  async delete(_resource: string, _id: string): Promise<any> {
     return true;
   }
 
diff --git a/packages/runner/tsconfig.json b/packages/runner/tsconfig.json
new file mode 100644
index 0000000000..bc8c136558
--- /dev/null
+++ b/packages/runner/tsconfig.json
@@ -0,0 +1,32 @@
+{
+  // Standalone rather than extending the root config: `runner` is a Vite app,
+  // so it wants the same shape as apps/console — and not inheriting the root
+  // `paths` keeps `@object-ui/*` resolving through each dependency's built
+  // `.d.ts` instead of pulling sibling sources in as program inputs.
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+
+    /* `import.meta.glob` in MetadataLoader, and CSS side-effect imports. */
+    "types": ["vite/client"]
+  },
+  "include": ["src"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.test.tsx"]
+}
diff --git a/scripts/check-type-check-coverage.mjs b/scripts/check-type-check-coverage.mjs
index 0652d43ce8..142c5db232 100644
--- a/scripts/check-type-check-coverage.mjs
+++ b/scripts/check-type-check-coverage.mjs
@@ -29,7 +29,6 @@ const root = resolve(dirname(fileURLToPath(import.meta.url)), "..");
 // #2911 sweep (bare `tsc --noEmit` with the `paths` override its type-checked
 // peers already carry, so the TS6059 rootDir noise is excluded).
 const DEBT = {
-  "@object-ui/runner": { errors: 14, issue: 2917, note: "no tsconfig.json at all; also imports two exports @object-ui/core does not have" },
   "@object-ui/plugin-form": { errors: 10, issue: 2919, note: "6x t() fallback-signature mismatch, 2x undefined index, 2x string|number" },
   "@object-ui/site": { errors: 7, issue: 2919, note: "TS2304 on Next's generated LayoutProps/PageProps; needs .next/types from a prior next build" },
   "@object-ui/plugin-grid": { errors: 4, issue: 2919, note: "2x t() call signature + 2x TS2367 that are closure-mutation narrowing artifacts, NOT a logic bug" },