diff --git a/src/sentry/integrations/api/endpoints/organization_integration_repos.py b/src/sentry/integrations/api/endpoints/organization_integration_repos.py
index a633deca9c809f..0053c495313de9 100644
--- a/src/sentry/integrations/api/endpoints/organization_integration_repos.py
+++ b/src/sentry/integrations/api/endpoints/organization_integration_repos.py
@@ -22,6 +22,7 @@ class IntegrationRepository(TypedDict):
     identifier: str
     isInstalled: bool
     defaultBranch: str | None
+    externalId: str
 
 
 @cell_silo_endpoint
@@ -85,6 +86,7 @@ def get(
                     identifier=repo["identifier"],
                     defaultBranch=repo.get("default_branch"),
                     isInstalled=repo["identifier"] in installed_repo_names,
+                    externalId=repo["external_id"],
                 )
                 for repo in repositories
                 if not installable_only or repo["identifier"] not in installed_repo_names
diff --git a/tests/acceptance/test_scm_onboarding.py b/tests/acceptance/test_scm_onboarding.py
index 0f872712336f2d..3cff96bb92db7e 100644
--- a/tests/acceptance/test_scm_onboarding.py
+++ b/tests/acceptance/test_scm_onboarding.py
@@ -52,6 +52,7 @@ def test_scm_onboarding_happy_path(self) -> None:
                 "name": "sentry",
                 "identifier": "getsentry/sentry",
                 "default_branch": "master",
+                "external_id": "12345",
             },
         ]
 
@@ -162,6 +163,7 @@ def test_scm_onboarding_with_integration_install(self) -> None:
                 "name": "sentry",
                 "identifier": "getsentry/sentry",
                 "default_branch": "master",
+                "external_id": "12345",
             },
         ]
 
@@ -273,6 +275,7 @@ def test_scm_onboarding_detection_error_falls_back_to_manual_picker(self) -> Non
                 "name": "sentry",
                 "identifier": "getsentry/sentry",
                 "default_branch": "master",
+                "external_id": "12345",
             },
         ]
 
diff --git a/tests/sentry/integrations/api/endpoints/test_organization_integration_repos.py b/tests/sentry/integrations/api/endpoints/test_organization_integration_repos.py
index 53a2d06b5694c4..e7caacc02cf588 100644
--- a/tests/sentry/integrations/api/endpoints/test_organization_integration_repos.py
+++ b/tests/sentry/integrations/api/endpoints/test_organization_integration_repos.py
@@ -22,8 +22,13 @@ def setUp(self) -> None:
     )
     def test_simple(self, get_repositories: MagicMock) -> None:
         get_repositories.return_value = [
-            {"name": "rad-repo", "identifier": "Example/rad-repo", "default_branch": "main"},
-            {"name": "cool-repo", "identifier": "Example/cool-repo"},
+            {
+                "name": "rad-repo",
+                "identifier": "Example/rad-repo",
+                "default_branch": "main",
+                "external_id": "rad-repo",
+            },
+            {"name": "cool-repo", "identifier": "Example/cool-repo", "external_id": "cool-repo"},
         ]
         response = self.client.get(self.path, format="json")
 
@@ -35,12 +40,14 @@ def test_simple(self, get_repositories: MagicMock) -> None:
                     "identifier": "Example/rad-repo",
                     "defaultBranch": "main",
                     "isInstalled": False,
+                    "externalId": "rad-repo",
                 },
                 {
                     "name": "cool-repo",
                     "identifier": "Example/cool-repo",
                     "defaultBranch": None,
                     "isInstalled": False,
+                    "externalId": "cool-repo",
                 },
             ],
             "searchable": True,
@@ -55,8 +62,9 @@ def test_hide_hidden_repos(self, get_repositories: MagicMock) -> None:
                 "name": "rad-repo",
                 "identifier": "Example/rad-repo",
                 "default_branch": "main",
+                "external_id": "rad-repo",
             },
-            {"name": "cool-repo", "identifier": "Example/cool-repo"},
+            {"name": "cool-repo", "identifier": "Example/cool-repo", "external_id": "cool-repo"},
         ]
 
         self.create_repo(
@@ -75,6 +83,7 @@ def test_hide_hidden_repos(self, get_repositories: MagicMock) -> None:
                     "identifier": "Example/cool-repo",
                     "defaultBranch": None,
                     "isInstalled": False,
+                    "externalId": "cool-repo",
                 },
             ],
             "searchable": True,
@@ -85,9 +94,23 @@ def test_hide_hidden_repos(self, get_repositories: MagicMock) -> None:
     )
     def test_installable_only(self, get_repositories: MagicMock) -> None:
         get_repositories.return_value = [
-            {"name": "rad-repo", "identifier": "Example/rad-repo", "default_branch": "main"},
-            {"name": "cool-repo", "identifier": "Example/cool-repo", "default_branch": "dev"},
-            {"name": "awesome-repo", "identifier": "Example/awesome-repo"},
+            {
+                "name": "rad-repo",
+                "identifier": "Example/rad-repo",
+                "default_branch": "main",
+                "external_id": "rad-repo",
+            },
+            {
+                "name": "cool-repo",
+                "identifier": "Example/cool-repo",
+                "default_branch": "dev",
+                "external_id": "cool-repo",
+            },
+            {
+                "name": "awesome-repo",
+                "identifier": "Example/awesome-repo",
+                "external_id": "awesome-repo",
+            },
         ]
 
         self.create_repo(
@@ -105,12 +128,14 @@ def test_installable_only(self, get_repositories: MagicMock) -> None:
                     "identifier": "Example/cool-repo",
                     "defaultBranch": "dev",
                     "isInstalled": False,
+                    "externalId": "cool-repo",
                 },
                 {
                     "name": "awesome-repo",
                     "identifier": "Example/awesome-repo",
                     "defaultBranch": None,
                     "isInstalled": False,
+                    "externalId": "awesome-repo",
                 },
             ],
             "searchable": True,
@@ -121,8 +146,18 @@ def test_installable_only(self, get_repositories: MagicMock) -> None:
     )
     def test_is_installed_field(self, get_repositories: MagicMock) -> None:
         get_repositories.return_value = [
-            {"name": "rad-repo", "identifier": "Example/rad-repo", "default_branch": "main"},
-            {"name": "rad-repo", "identifier": "Example2/rad-repo", "default_branch": "dev"},
+            {
+                "name": "rad-repo",
+                "identifier": "Example/rad-repo",
+                "default_branch": "main",
+                "external_id": "rad-repo",
+            },
+            {
+                "name": "rad-repo",
+                "identifier": "Example2/rad-repo",
+                "default_branch": "dev",
+                "external_id": "rad-repo",
+            },
         ]
 
         self.create_repo(
@@ -141,11 +176,13 @@ def test_is_installed_field(self, get_repositories: MagicMock) -> None:
                     "identifier": "Example/rad-repo",
                     "defaultBranch": "main",
                     "isInstalled": True,
+                    "externalId": "rad-repo",
                 },
                 {
                     "name": "rad-repo",
                     "identifier": "Example2/rad-repo",
                     "defaultBranch": "dev",
+                    "externalId": "rad-repo",
                     "isInstalled": False,
                 },
             ],
@@ -161,7 +198,12 @@ def test_repo_installed_by_other_org_not_excluded(self, get_repositories: MagicM
         one organization should not affect the available repos for the other.
         """
         get_repositories.return_value = [
-            {"name": "shared-repo", "identifier": "Example/shared-repo", "default_branch": "main"},
+            {
+                "name": "shared-repo",
+                "identifier": "Example/shared-repo",
+                "default_branch": "main",
+                "external_id": "shared-repo",
+            },
         ]
 
         other_org = self.create_organization(owner=self.user, name="other-org")
@@ -182,6 +224,7 @@ def test_repo_installed_by_other_org_not_excluded(self, get_repositories: MagicM
                     "identifier": "Example/shared-repo",
                     "defaultBranch": "main",
                     "isInstalled": False,
+                    "externalId": "shared-repo",
                 },
             ],
             "searchable": True,
@@ -193,7 +236,12 @@ def test_repo_installed_by_other_org_not_excluded(self, get_repositories: MagicM
     def test_accessible_only_passes_param(self, get_repositories: MagicMock) -> None:
         """When accessibleOnly=true, passes accessible_only to get_repositories."""
         get_repositories.return_value = [
-            {"name": "rad-repo", "identifier": "Example/rad-repo", "default_branch": "main"},
+            {
+                "name": "rad-repo",
+                "identifier": "Example/rad-repo",
+                "default_branch": "main",
+                "external_id": "rad-repo",
+            },
         ]
         response = self.client.get(
             self.path, format="json", data={"search": "rad", "accessibleOnly": "true"}
@@ -208,6 +256,7 @@ def test_accessible_only_passes_param(self, get_repositories: MagicMock) -> None
                     "identifier": "Example/rad-repo",
                     "defaultBranch": "main",
                     "isInstalled": False,
+                    "externalId": "rad-repo",
                 },
             ],
             "searchable": True,
@@ -219,7 +268,12 @@ def test_accessible_only_passes_param(self, get_repositories: MagicMock) -> None
     def test_accessible_only_without_search(self, get_repositories: MagicMock) -> None:
         """When accessibleOnly=true but no search, passes both params through."""
         get_repositories.return_value = [
-            {"name": "rad-repo", "identifier": "Example/rad-repo", "default_branch": "main"},
+            {
+                "name": "rad-repo",
+                "identifier": "Example/rad-repo",
+                "default_branch": "main",
+                "external_id": "rad-repo",
+            },
         ]
         response = self.client.get(self.path, format="json", data={"accessibleOnly": "true"})
 
@@ -232,8 +286,18 @@ def test_accessible_only_without_search(self, get_repositories: MagicMock) -> No
     def test_accessible_only_with_installable_only(self, get_repositories: MagicMock) -> None:
         """Both filters compose: accessible scopes the fetch, installable excludes installed repos."""
         get_repositories.return_value = [
-            {"name": "rad-repo", "identifier": "Example/rad-repo", "default_branch": "main"},
-            {"name": "cool-repo", "identifier": "Example/cool-repo", "default_branch": "dev"},
+            {
+                "name": "rad-repo",
+                "identifier": "Example/rad-repo",
+                "default_branch": "main",
+                "external_id": "rad-repo",
+            },
+            {
+                "name": "cool-repo",
+                "identifier": "Example/cool-repo",
+                "default_branch": "dev",
+                "external_id": "cool-repo",
+            },
         ]
 
         self.create_repo(
@@ -257,6 +321,7 @@ def test_accessible_only_with_installable_only(self, get_repositories: MagicMock
                     "identifier": "Example/cool-repo",
                     "defaultBranch": "dev",
                     "isInstalled": False,
+                    "externalId": "cool-repo",
                 },
             ],
             "searchable": True,