diff --git a/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.test.ts b/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.test.ts
index 111ffbd1537c3..588734b754f50 100644
--- a/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.test.ts
+++ b/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.test.ts
@@ -276,6 +276,42 @@ describe("GitCafeSourceControlProvider", () => {
     );
   });
 
+  it.effect("keeps a GitHub fork's pull request off the repository's own branch", () => {
+    const client = HttpClient.make((request) =>
+      Effect.succeed(
+        HttpClientResponse.fromWeb(
+          request,
+          new Response(
+            encodeJson({
+              number: 7,
+              title: "Change",
+              state: "open",
+              draft: false,
+              sourceBranch: "main",
+              targetBranch: "main",
+              headOid: null,
+              updatedAt: null,
+              sourceRepo: null,
+              isCrossFork: true,
+              closedAt: null,
+              mergedAt: null,
+            }),
+          ),
+        ),
+      ),
+    );
+    return Effect.gen(function* () {
+      const provider = yield* GitCafeSourceControlProvider.make;
+      const pull = yield* provider.getChangeRequest({
+        cwd: "/repo",
+        reference: "https://git.cafe/team/project/pulls/7",
+      });
+      assert.strictEqual(pull.isCrossRepository, true);
+      assert.strictEqual(pull.headRepositoryNameWithOwner, undefined);
+      assert.strictEqual(pull.headRepositoryOwnerLogin, undefined);
+    }).pipe(Effect.provide(layerFor(client)));
+  });
+
   it.effect("opens a pull request from a fork over REST with the body file's text", () => {
     const sent: Array<{ method: string; url: string; body: unknown }> = [];
     const client = HttpClient.make((request) => {
diff --git a/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.ts b/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.ts
index e02ebd0b45527..8800622987f55 100644
--- a/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.ts
+++ b/packages/source-control-gitcafe/src/server/GitCafeSourceControlProvider.ts
@@ -139,6 +139,7 @@ const PullDetail = Schema.Struct({
   sourceRepo: Schema.NullOr(
     Schema.Struct({ owner: TrimmedNonEmptyString, name: TrimmedNonEmptyString }),
   ),
+  isCrossFork: Schema.optional(Schema.Boolean),
   closedAt: Schema.NullOr(Schema.String),
   mergedAt: Schema.NullOr(Schema.String),
 });
@@ -265,6 +266,8 @@ export const make = Effect.gen(function* () {
       PullDetail,
     );
     const owner = target.repository.split("/")[0] ?? null;
+    // Pulls synced from GitHub forks report isCrossFork without naming the fork.
+    const unnamedFork = pull.sourceRepo === null && pull.isCrossFork === true;
     return {
       provider: SourceControlProviderKind.make("gitcafe"),
       number: pull.number,
@@ -278,16 +281,22 @@ export const make = Effect.gen(function* () {
       closedAt: pull.closedAt,
       mergedAt: pull.mergedAt,
       updatedAt: pull.updatedAt,
-      isCrossRepository: pull.sourceRepo !== null,
-      headRepositoryNameWithOwner: pull.sourceRepo
-        ? `${pull.sourceRepo.owner}/${pull.sourceRepo.name}`
-        : target.repository,
-      headRepositoryOwnerLogin: pull.sourceRepo?.owner ?? owner,
+      isCrossRepository: pull.sourceRepo !== null || unnamedFork,
+      ...(unnamedFork
+        ? {}
+        : {
+            headRepositoryNameWithOwner: pull.sourceRepo
+              ? `${pull.sourceRepo.owner}/${pull.sourceRepo.name}`
+              : target.repository,
+            headRepositoryOwnerLogin: pull.sourceRepo?.owner ?? owner,
+          }),
     } satisfies ChangeRequest;
   });
 
   return SourceControlProvider.SourceControlProvider.of({
     kind: SourceControlProviderKind.make("gitcafe"),
+    // Fork pulls share bare branch names; read past them to this repository's own pull.
+    headBranchProbe: ({ headSelectors }) => ({ headSelectors, limit: 20 }),
     repositoryNameFromRemoteUrl: (url) => GitCafeHosts.parseGitCafeRemote(url)?.repository ?? null,
     getChangeRequest: getPull,
     listChangeRequests: Effect.fn("GitCafeSourceControlProvider.listChangeRequests")(