diff --git a/src/cli.test.ts b/src/cli.test.ts
index 98464eb..5675c47 100644
--- a/src/cli.test.ts
+++ b/src/cli.test.ts
@@ -120,6 +120,57 @@ test('writes a report when the GitHub calls succeed', async () => {
   expect(JSON.stringify(analytics.captureCalls)).not.toContain('widgets');
 });
 
+test('excludes forked repos from the crawl', async () => {
+  const { ctx, githubClient, analytics } = createFakeContext();
+
+  githubClient.onPaginate('GET /orgs/{org}/repos', {}).resolves([
+    {
+      name: 'widgets',
+      owner: { login: 'acme' },
+      private: true,
+      visibility: 'private',
+      archived: false,
+      fork: false,
+      default_branch: 'main',
+      language: 'TypeScript',
+      pushed_at: '2026-04-01T00:00:00Z',
+    },
+    {
+      name: 'upstream-fork',
+      owner: { login: 'acme' },
+      private: false,
+      visibility: 'public',
+      archived: false,
+      fork: true,
+      default_branch: 'main',
+      language: 'Go',
+      pushed_at: '2026-04-01T00:00:00Z',
+    },
+  ]);
+  githubClient.onRequest('GET /repos/{owner}/{repo}/languages', {}).resolves({ TypeScript: 1000 });
+  githubClient.onRequest('GET /repos/{owner}/{repo}/contents/{path}', {}).resolves({
+    content: Buffer.from('updates:\n  - package-ecosystem: "npm"\n', 'utf8').toString('base64'),
+    encoding: 'base64',
+  });
+  githubClient.onPaginate('GET /repos/{owner}/{repo}/dependabot/alerts', {}).resolves([]);
+  githubClient
+    .onRequest('GET /repos/{owner}/{repo}/branches/{branch}/protection', {})
+    .fails({ kind: 'not-found', message: 'no protection' });
+  githubClient.onRequest('GET /repos/{owner}/{repo}/rules/branches/{branch}', {}).resolves([]);
+  githubClient.onPaginate('GET /repos/{owner}/{repo}/commits', {}).resolves([]);
+  githubClient.onGraphql('DependabotPrs').resolves({
+    search: { pageInfo: { hasNextPage: false, endCursor: null }, nodes: [] },
+  });
+
+  const result = await main(ctx, ['acme']);
+  expect(result.kind).toBe('completed');
+
+  expect(analytics.capturedEvents('run_completed')[0]?.properties).toMatchObject({
+    repos_total: 2,
+    repos_included: 1,
+  });
+});
+
 test('captures run_failed when listOrgRepos fails', async () => {
   const { ctx, githubClient, analytics } = createFakeContext();
   githubClient.onPaginate('GET /orgs/{org}/repos', {}).fails({ kind: 'forbidden', message: 'no access' });
diff --git a/src/cli.ts b/src/cli.ts
index c9cd986..b64153d 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -363,7 +363,7 @@ export function parseCli(argv: readonly string[]): ParseCliResult {
 }
 
 function filterRepos(repos: RepoMeta[], opts: ResolvedOptions): RepoMeta[] {
-  let out = repos.filter((r) => !r.archived);
+  let out = repos.filter((r) => !r.archived && !r.fork);
   const includeSet = opts.include === null ? null : new Set(opts.include);
   const excludeSet = new Set(opts.exclude);
   if (includeSet !== null) out = out.filter((r) => includeSet.has(r.name));
diff --git a/src/collectors/dependabotPrs.test.ts b/src/collectors/dependabotPrs.test.ts
index c7c1d8b..de8fc68 100644
--- a/src/collectors/dependabotPrs.test.ts
+++ b/src/collectors/dependabotPrs.test.ts
@@ -12,9 +12,14 @@ test('maps a single page of search results to DependabotPr', async () => {
         rawPullRequest.build({
           state: 'MERGED',
           mergedAt: '2026-04-05T00:00:00Z',
-          mergedBy: { login: 'alice' },
-          reviews: { nodes: [{ author: { login: 'bob' } }, { author: { login: 'alice' } }] },
-          comments: { nodes: [{ author: { login: 'alice' } }] },
+          mergedBy: { __typename: 'User', login: 'alice' },
+          reviews: {
+            nodes: [
+              { author: { __typename: 'User', login: 'bob' } },
+              { author: { __typename: 'User', login: 'alice' } },
+            ],
+          },
+          comments: { nodes: [{ author: { __typename: 'User', login: 'alice' } }] },
         }),
       ],
     },
@@ -35,6 +40,38 @@ test('maps a single page of search results to DependabotPr', async () => {
   });
 });
 
+test('drops bot actors from mergers, reviewers, and commenters', async () => {
+  const client = new FakeGithubClient();
+  client.onGraphql('DependabotPrs').resolves({
+    search: {
+      pageInfo: { hasNextPage: false, endCursor: null },
+      nodes: [
+        rawPullRequest.build({
+          state: 'MERGED',
+          mergedAt: '2026-04-05T00:00:00Z',
+          // A GitHub App that merged the PR: Bot typename, no [bot] suffix.
+          mergedBy: { __typename: 'Bot', login: 'auto-merge-app' },
+          reviews: {
+            nodes: [
+              { author: { __typename: 'Bot', login: 'greptile-apps' } },
+              { author: { __typename: 'User', login: 'carol' } },
+            ],
+          },
+          comments: { nodes: [{ author: { __typename: 'Bot', login: 'dependabot' } }] },
+        }),
+      ],
+    },
+  });
+
+  const result = await listDependabotPrs(client, 'acme', '2026-01-01T00:00:00Z');
+  const prs = result.unwrapOr([]);
+  expect(prs[0]).toMatchObject({
+    mergedBy: null,
+    reviewers: ['carol'],
+    commenters: [],
+  });
+});
+
 test('pages through results when hasNextPage is true', async () => {
   const client = new FakeGithubClient();
   // First page returns cursor; second returns no more.
diff --git a/src/collectors/dependabotPrs.ts b/src/collectors/dependabotPrs.ts
index a5e48a6..3d1aa7c 100644
--- a/src/collectors/dependabotPrs.ts
+++ b/src/collectors/dependabotPrs.ts
@@ -10,6 +10,14 @@ interface GraphqlSearchResponse {
   };
 }
 
+// GitHub's GraphQL Actor interface. `__typename` is the source of truth for
+// whether an actor is a bot: GitHub App accounts (e.g. greptile-apps) surface
+// here as `Bot` and — unlike the REST API — carry no `[bot]` login suffix.
+export interface RawActor {
+  __typename: string;
+  login: string;
+}
+
 export interface RawPullRequest {
   number: number;
   title: string;
@@ -20,11 +28,11 @@ export interface RawPullRequest {
   url: string;
   baseRefName: string;
   headRefName: string;
-  mergedBy: { login: string } | null;
+  mergedBy: RawActor | null;
   autoMergeRequest: { enabledAt: string | null } | null;
   repository: { owner: { login: string }; name: string };
-  reviews: { nodes: Array<{ author: { login: string } | null } | null> };
-  comments: { nodes: Array<{ author: { login: string } | null } | null> };
+  reviews: { nodes: Array<{ author: RawActor | null } | null> };
+  comments: { nodes: Array<{ author: RawActor | null } | null> };
   commits: {
     nodes: Array<{
       commit: {
@@ -61,6 +69,7 @@ const SEARCH_QUERY = /* GraphQL */ `
           baseRefName
           headRefName
           mergedBy {
+            __typename
             login
           }
           autoMergeRequest {
@@ -75,6 +84,7 @@ const SEARCH_QUERY = /* GraphQL */ `
           reviews(first: 50) {
             nodes {
               author {
+                __typename
                 login
               }
             }
@@ -82,6 +92,7 @@ const SEARCH_QUERY = /* GraphQL */ `
           comments(first: 50) {
             nodes {
               author {
+                __typename
                 login
               }
             }
@@ -145,8 +156,8 @@ function pageThrough(
 function toDependabotPr(raw: RawPullRequest): DependabotPr {
   const state: PrState = raw.state === 'OPEN' ? 'open' : 'closed';
   const merged = raw.state === 'MERGED';
-  const reviewers = uniqueLogins(raw.reviews.nodes.map((n) => n?.author?.login));
-  const commenters = uniqueLogins(raw.comments.nodes.map((n) => n?.author?.login));
+  const reviewers = uniqueLogins(raw.reviews.nodes);
+  const commenters = uniqueLogins(raw.comments.nodes);
   return {
     owner: raw.repository.owner.login,
     name: raw.repository.name,
@@ -157,7 +168,7 @@ function toDependabotPr(raw: RawPullRequest): DependabotPr {
     createdAt: raw.createdAt,
     closedAt: raw.closedAt,
     mergedAt: raw.mergedAt,
-    mergedBy: raw.mergedBy?.login ?? null,
+    mergedBy: raw.mergedBy && !isBotActor(raw.mergedBy) ? raw.mergedBy.login : null,
     headRef: raw.headRefName,
     baseRef: raw.baseRefName,
     htmlUrl: raw.url,
@@ -204,12 +215,16 @@ function summarizeChecks(raw: RawPullRequest): CheckSummary {
   return summary;
 }
 
-function uniqueLogins(values: Array<string | null | undefined>): string[] {
+function uniqueLogins(nodes: Array<{ author: RawActor | null } | null>): string[] {
   const seen = new Set<string>();
-  for (const v of values) {
-    if (!v) continue;
-    if (v.endsWith('[bot]')) continue;
-    seen.add(v);
+  for (const node of nodes) {
+    const author = node?.author;
+    if (!author || isBotActor(author)) continue;
+    seen.add(author.login);
   }
   return [...seen].sort();
 }
+
+function isBotActor(actor: RawActor): boolean {
+  return actor.__typename === 'Bot' || actor.login.endsWith('[bot]');
+}
diff --git a/src/collectors/repos.test.ts b/src/collectors/repos.test.ts
index bf22a2f..b34ee8d 100644
--- a/src/collectors/repos.test.ts
+++ b/src/collectors/repos.test.ts
@@ -11,6 +11,7 @@ test('maps raw repo payloads into RepoMeta and infers visibility', async () => {
       private: false,
       visibility: 'public',
       archived: false,
+      fork: false,
       default_branch: 'main',
       language: 'TypeScript',
       pushed_at: '2026-04-01T00:00:00Z',
@@ -22,6 +23,7 @@ test('maps raw repo payloads into RepoMeta and infers visibility', async () => {
       private: true,
       visibility: 'internal',
       archived: true,
+      fork: true,
       default_branch: 'main',
       language: null,
       pushed_at: null,
@@ -38,11 +40,13 @@ test('maps raw repo payloads into RepoMeta and infers visibility', async () => {
       name: 'widgets',
       visibility: 'public',
       archived: false,
+      fork: false,
       dependabotSecurityUpdates: true,
     });
     expect(repos[1]).toMatchObject({
       visibility: 'internal',
       archived: true,
+      fork: true,
       dependabotSecurityUpdates: null,
     });
   }
@@ -58,6 +62,7 @@ test('falls back to the user endpoint when the org endpoint 404s', async () => {
       private: false,
       visibility: 'public',
       archived: false,
+      fork: false,
       default_branch: 'main',
       language: 'TypeScript',
       pushed_at: '2026-04-01T00:00:00Z',
diff --git a/src/collectors/repos.ts b/src/collectors/repos.ts
index 028dd01..a103a1e 100644
--- a/src/collectors/repos.ts
+++ b/src/collectors/repos.ts
@@ -9,6 +9,7 @@ interface RawRepo {
   private: boolean;
   visibility?: string;
   archived: boolean;
+  fork: boolean;
   default_branch: string;
   language: string | null;
   pushed_at: string | null;
@@ -53,6 +54,7 @@ function toRepoMeta(raw: RawRepo): RepoMeta {
     name: raw.name,
     visibility,
     archived: raw.archived,
+    fork: raw.fork,
     defaultBranch: raw.default_branch,
     primaryLanguage: raw.language,
     pushedAt: raw.pushed_at,
diff --git a/src/testFactories.ts b/src/testFactories.ts
index 4363f47..a614221 100644
--- a/src/testFactories.ts
+++ b/src/testFactories.ts
@@ -27,6 +27,7 @@ export const repoMeta = Factory.define<RepoMeta>(() => ({
   name: 'widgets',
   visibility: 'private',
   archived: false,
+  fork: false,
   defaultBranch: 'main',
   primaryLanguage: 'TypeScript',
   pushedAt: '2026-04-01T00:00:00Z',
diff --git a/src/types.ts b/src/types.ts
index 0e742bb..2f0297e 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -10,6 +10,7 @@ export interface RepoRef {
 export interface RepoMeta extends RepoRef {
   visibility: Visibility;
   archived: boolean;
+  fork: boolean;
   defaultBranch: string;
   primaryLanguage: string | null;
   pushedAt: string | null;