diff --git a/packages/core/src/evaluation/workspace/repo-manager.ts b/packages/core/src/evaluation/workspace/repo-manager.ts
index b56ad4517..5ffedb83b 100644
--- a/packages/core/src/evaluation/workspace/repo-manager.ts
+++ b/packages/core/src/evaluation/workspace/repo-manager.ts
@@ -31,6 +31,7 @@ interface RepoManagerOptions {
   readonly progress?: boolean;
   readonly heartbeatMs?: number;
   readonly timeoutMs?: number;
+  readonly projectConfigDir?: string;
 }
 
 interface AcquisitionSource {
@@ -114,12 +115,14 @@ export class RepoManager {
   private readonly progress: boolean;
   private readonly heartbeatMs: number;
   private readonly timeoutMs: number;
+  private readonly projectConfigDir?: string;
 
   constructor(verbose = false, options: RepoManagerOptions = {}) {
     this.verbose = verbose;
     this.progress = options.progress ?? true;
     this.heartbeatMs = options.heartbeatMs ?? DEFAULT_HEARTBEAT_MS;
     this.timeoutMs = options.timeoutMs ?? DEFAULT_TIMEOUT_MS;
+    this.projectConfigDir = options.projectConfigDir;
   }
 
   private async runGit(args: string[], opts?: GitRunOptions): Promise<string> {
@@ -241,8 +244,7 @@ export class RepoManager {
     });
   }
 
-  private loadConfiguredMirrors(): Record<string, string> {
-    const filePath = configPath();
+  private loadConfiguredMirrorsFrom(filePath: string): Record<string, string> {
     if (!existsSync(filePath)) return {};
     try {
       const parsed = parseYamlValue(readFileSync(filePath, 'utf-8')) as unknown;
@@ -264,6 +266,64 @@ export class RepoManager {
     }
   }
 
+  private findProjectAgentvDir(): string | undefined {
+    if (!this.projectConfigDir) return undefined;
+
+    let current = path.resolve(this.projectConfigDir);
+    while (true) {
+      const candidateDir = path.join(current, '.agentv');
+      if (
+        existsSync(path.join(candidateDir, 'config.yaml')) ||
+        existsSync(path.join(candidateDir, 'config.override.yaml'))
+      ) {
+        return candidateDir;
+      }
+
+      const reachedRepoRoot = existsSync(path.join(current, '.git'));
+      const parent = path.dirname(current);
+      if (reachedRepoRoot || parent === current) return undefined;
+      current = parent;
+    }
+  }
+
+  private mergeConfiguredMirrorLayers(
+    layers: Array<Record<string, string>>,
+  ): Record<string, string> {
+    const mirrorsByRepo = new Map<string, string>();
+    const repoByIdentity = new Map<string, string>();
+
+    for (const layer of layers) {
+      for (const [repo, localPath] of Object.entries(layer)) {
+        const repoIdentity = normalizeRepoIdentity(repo);
+        const previousRepo = repoByIdentity.get(repoIdentity);
+        if (previousRepo) mirrorsByRepo.delete(previousRepo);
+
+        repoByIdentity.set(repoIdentity, repo);
+        mirrorsByRepo.set(repo, localPath);
+      }
+    }
+
+    return Object.fromEntries(mirrorsByRepo);
+  }
+
+  private loadConfiguredMirrors(): Record<string, string> {
+    const globalMirrors = this.loadConfiguredMirrorsFrom(configPath());
+    const projectAgentvDir = this.findProjectAgentvDir();
+    if (!projectAgentvDir) return globalMirrors;
+
+    const projectMirrors = this.loadConfiguredMirrorsFrom(
+      path.join(projectAgentvDir, 'config.yaml'),
+    );
+    const projectOverrideMirrors = this.loadConfiguredMirrorsFrom(
+      path.join(projectAgentvDir, 'config.override.yaml'),
+    );
+    return this.mergeConfiguredMirrorLayers([
+      globalMirrors,
+      projectMirrors,
+      projectOverrideMirrors,
+    ]);
+  }
+
   private findConfiguredMirror(repoIdentity: string): string | undefined {
     const mirrors = this.loadConfiguredMirrors();
     for (const [repo, localPath] of Object.entries(mirrors)) {
diff --git a/packages/core/src/evaluation/workspace/setup.ts b/packages/core/src/evaluation/workspace/setup.ts
index bc4a57fed..db5251b08 100644
--- a/packages/core/src/evaluation/workspace/setup.ts
+++ b/packages/core/src/evaluation/workspace/setup.ts
@@ -395,7 +395,7 @@ export async function prepareSharedWorkspaceSetup(
       const slotsNeeded = workers;
       setupLog(`acquiring ${slotsNeeded} workspace pool slot(s) (pool capacity: ${poolMaxSlots})`);
       poolManager = new WorkspacePoolManager(getWorkspacePoolRoot());
-      const poolRepoManager = new RepoManager(verbose);
+      const poolRepoManager = new RepoManager(verbose, { projectConfigDir: evalDir });
       repoManager = poolRepoManager;
 
       for (let i = 0; i < slotsNeeded; i++) {
@@ -459,7 +459,9 @@ export async function prepareSharedWorkspaceSetup(
       hasReposToMaterialize && useStaticWorkspace && !staticMaterialised && isYamlConfiguredPath;
     repoManager =
       repoManager ??
-      (needsRepoMaterialisation || needsPerRepoCheck ? new RepoManager(verbose) : undefined);
+      (needsRepoMaterialisation || needsPerRepoCheck
+        ? new RepoManager(verbose, { projectConfigDir: evalDir })
+        : undefined);
 
     if (
       (needsRepoMaterialisation || needsPerRepoCheck) &&
@@ -857,7 +859,7 @@ export async function prepareEvalCaseWorkspace(
     }
 
     if (evalCase.workspace?.repos?.length && workspacePath) {
-      const perCaseRepoManager = new RepoManager(setupDebug);
+      const perCaseRepoManager = new RepoManager(setupDebug, { projectConfigDir: evalDir });
       try {
         if (setupDebug) {
           console.log(
diff --git a/packages/core/test/evaluation/workspace/repo-manager.test.ts b/packages/core/test/evaluation/workspace/repo-manager.test.ts
index 2948557b7..5f3942d3b 100644
--- a/packages/core/test/evaluation/workspace/repo-manager.test.ts
+++ b/packages/core/test/evaluation/workspace/repo-manager.test.ts
@@ -71,6 +71,30 @@ function cachePathFor(repo: string): string {
   return path.join(dataDir, 'git-cache', hash);
 }
 
+function writeMirrorConfig(configFilePath: string, mirrors: Record<string, string>): void {
+  mkdirSync(path.dirname(configFilePath), { recursive: true });
+  writeFileSync(
+    configFilePath,
+    [
+      'git_cache:',
+      '  mirrors:',
+      ...Object.entries(mirrors).map(
+        ([repo, localPath]) => `    ${JSON.stringify(repo)}: ${JSON.stringify(localPath)}`,
+      ),
+      '',
+    ].join('\n'),
+  );
+}
+
+function findConfiguredMirrorFor(manager: RepoManager, repo: string): string | undefined {
+  const findConfiguredMirror = (
+    manager as unknown as {
+      findConfiguredMirror(repoIdentity: string): string | undefined;
+    }
+  ).findConfiguredMirror.bind(manager);
+  return findConfiguredMirror(normalizeRepoIdentity(repo));
+}
+
 describe('RepoManager', () => {
   let tmpDir: string;
   let workspaceDir: string;
@@ -103,6 +127,169 @@ describe('RepoManager', () => {
     await rm(tmpDir, { recursive: true, force: true });
   });
 
+  describe('configured mirrors', () => {
+    it('loads project-local mirrors only when projectConfigDir is set', () => {
+      const projectDir = path.join(tmpDir, 'project');
+      const evalDir = path.join(projectDir, 'evals', 'cases');
+      const mirrorDir = path.join(tmpDir, 'project-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(mirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.yaml'), {
+        'https://github.com/example/project-only.git': mirrorDir,
+      });
+
+      expect(
+        findConfiguredMirrorFor(manager, 'https://github.com/example/project-only.git'),
+      ).toBeUndefined();
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/project-only.git'),
+      ).toBe(mirrorDir);
+    });
+
+    it('prefers project-local mirrors over global mirrors for the same normalized repo key', () => {
+      const homeDir = process.env.AGENTV_HOME;
+      if (!homeDir) throw new Error('AGENTV_HOME not set');
+      const projectDir = path.join(tmpDir, 'project');
+      const evalDir = path.join(projectDir, 'evals');
+      const globalMirrorDir = path.join(tmpDir, 'global-mirror');
+      const projectMirrorDir = path.join(tmpDir, 'project-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(globalMirrorDir, { recursive: true });
+      mkdirSync(projectMirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(homeDir, 'config.yaml'), {
+        'https://github.com/example/shared.git': globalMirrorDir,
+      });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.yaml'), {
+        'git@github.com:example/shared.git': projectMirrorDir,
+      });
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(findConfiguredMirrorFor(projectManager, 'https://github.com/example/shared.git')).toBe(
+        projectMirrorDir,
+      );
+    });
+
+    it('loads project-local override mirrors without a committed project config', () => {
+      const projectDir = path.join(tmpDir, 'project');
+      const evalDir = path.join(projectDir, 'evals');
+      const overrideMirrorDir = path.join(tmpDir, 'override-only-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(overrideMirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.override.yaml'), {
+        'https://github.com/example/override-only.git': overrideMirrorDir,
+      });
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/override-only.git'),
+      ).toBe(overrideMirrorDir);
+    });
+
+    it('prefers override mirrors over committed and global mirrors for the same normalized repo key', () => {
+      const homeDir = process.env.AGENTV_HOME;
+      if (!homeDir) throw new Error('AGENTV_HOME not set');
+      const projectDir = path.join(tmpDir, 'project');
+      const evalDir = path.join(projectDir, 'evals');
+      const globalMirrorDir = path.join(tmpDir, 'global-mirror');
+      const projectMirrorDir = path.join(tmpDir, 'project-mirror');
+      const overrideMirrorDir = path.join(tmpDir, 'override-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(globalMirrorDir, { recursive: true });
+      mkdirSync(projectMirrorDir, { recursive: true });
+      mkdirSync(overrideMirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(homeDir, 'config.yaml'), {
+        'https://github.com/example/shared.git': globalMirrorDir,
+      });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.yaml'), {
+        'git@github.com:example/shared.git': projectMirrorDir,
+      });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.override.yaml'), {
+        'https://github.com/Example/Shared': overrideMirrorDir,
+      });
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(findConfiguredMirrorFor(projectManager, 'https://github.com/example/shared.git')).toBe(
+        overrideMirrorDir,
+      );
+    });
+
+    it('merges override mirrors with different committed project mirror entries', () => {
+      const projectDir = path.join(tmpDir, 'project');
+      const evalDir = path.join(projectDir, 'evals');
+      const projectMirrorDir = path.join(tmpDir, 'project-only-mirror');
+      const overrideMirrorDir = path.join(tmpDir, 'override-only-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(projectMirrorDir, { recursive: true });
+      mkdirSync(overrideMirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.yaml'), {
+        'https://github.com/example/project-only.git': projectMirrorDir,
+      });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.override.yaml'), {
+        'https://github.com/example/override-only.git': overrideMirrorDir,
+      });
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/project-only.git'),
+      ).toBe(projectMirrorDir);
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/override-only.git'),
+      ).toBe(overrideMirrorDir);
+    });
+
+    it('merges different project-local and global mirror entries', () => {
+      const homeDir = process.env.AGENTV_HOME;
+      if (!homeDir) throw new Error('AGENTV_HOME not set');
+      const projectDir = path.join(tmpDir, 'project');
+      const evalDir = path.join(projectDir, 'evals');
+      const globalMirrorDir = path.join(tmpDir, 'global-only-mirror');
+      const projectMirrorDir = path.join(tmpDir, 'project-only-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(globalMirrorDir, { recursive: true });
+      mkdirSync(projectMirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(homeDir, 'config.yaml'), {
+        'https://github.com/example/global-only.git': globalMirrorDir,
+      });
+      writeMirrorConfig(path.join(projectDir, '.agentv', 'config.yaml'), {
+        'https://github.com/example/project-only.git': projectMirrorDir,
+      });
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/global-only.git'),
+      ).toBe(globalMirrorDir);
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/project-only.git'),
+      ).toBe(projectMirrorDir);
+    });
+
+    it('does not load project-local config above the .git repo-root boundary', () => {
+      const outerDir = path.join(tmpDir, 'outer');
+      const projectDir = path.join(outerDir, 'repo');
+      const evalDir = path.join(projectDir, 'evals');
+      const outerMirrorDir = path.join(tmpDir, 'outer-mirror');
+      mkdirSync(path.join(projectDir, '.git'), { recursive: true });
+      mkdirSync(evalDir, { recursive: true });
+      mkdirSync(outerMirrorDir, { recursive: true });
+      writeMirrorConfig(path.join(outerDir, '.agentv', 'config.yaml'), {
+        'https://github.com/example/outer.git': outerMirrorDir,
+      });
+
+      const projectManager = new RepoManager(false, { progress: false, projectConfigDir: evalDir });
+      expect(
+        findConfiguredMirrorFor(projectManager, 'https://github.com/example/outer.git'),
+      ).toBeUndefined();
+    });
+  });
+
   describe('materialize', () => {
     it('clones repo into workspace at specified path', async () => {
       const repoDir = path.join(tmpDir, 'source-repo');
diff --git a/skills-data/agentv-eval-writer/SKILL.md b/skills-data/agentv-eval-writer/SKILL.md
index d823d930a..ca57ac09f 100644
--- a/skills-data/agentv-eval-writer/SKILL.md
+++ b/skills-data/agentv-eval-writer/SKILL.md
@@ -318,7 +318,7 @@ For SWE-bench-style evals, keep operational checkout state under `workspace.repo
 
 ### Repository Lifecycle
 
-Materialize repos into the eval workspace automatically. Repo entries declare identity and checkout pins only; AgentV resolves acquisition from registered projects, `git_cache.mirrors`, its mirror cache, then remote clone. For shared repo workspaces, pooling is the default:
+Materialize repos into the eval workspace automatically. Repo entries declare identity and checkout pins only; AgentV resolves acquisition from registered projects, `git_cache.mirrors`, its mirror cache, then remote clone. `git_cache.mirrors` may be defined in `$AGENTV_HOME/config.yaml`, the project's committed `.agentv/config.yaml`, or a gitignored `.agentv/config.override.yaml` (highest precedence) — use the override for machine-specific local clone paths without editing tracked or user-global config. For shared repo workspaces, pooling is the default:
 
 ```yaml
 workspace:
diff --git a/skills-data/agentv-eval-writer/references/config-schema.json b/skills-data/agentv-eval-writer/references/config-schema.json
index babedf934..3a75a1ea4 100644
--- a/skills-data/agentv-eval-writer/references/config-schema.json
+++ b/skills-data/agentv-eval-writer/references/config-schema.json
@@ -66,6 +66,22 @@
         }
       },
       "additionalProperties": false
+    },
+    "git_cache": {
+      "type": "object",
+      "description": "Local mirror configuration for workspace repo materialization. Mirrors are an optimization: when a repo's mirror path exists locally, AgentV materializes the pinned commit from it instead of cloning from GitHub. Resolvable from three layers, highest precedence first: the project-local '.agentv/config.override.yaml' (intended to be gitignored, for machine-specific paths), the committed project '.agentv/config.yaml', then the user-global '$AGENTV_HOME/config.yaml'. Higher layers override lower ones by normalized repo identity.",
+      "properties": {
+        "mirrors": {
+          "type": "object",
+          "description": "Map of repo identity (full clone URL or 'org/name' shorthand) to a local clone path used as a mirror. If the path is absent at runtime, AgentV falls back to cloning from GitHub with configured credentials.",
+          "additionalProperties": {
+            "type": "string",
+            "description": "Local path to a clone of the repo (supports '~' home expansion)."
+          },
+          "examples": [{ "https://github.com/org/repo.git": "/path/to/local/repo" }]
+        }
+      },
+      "additionalProperties": false
     }
   },
   "definitions": {