fix: extend Slack repo detection to support space syntax and GitHub URLs (#1046)

`get_slack_repo_config` previously only matched `repo:owner/name` (colon).
Messages using `repo owner/name` (space) or containing a GitHub URL like
`https://github.com/langchain-ai/langgraph-api` fell back to the default
repo. This extends the detection with both patterns — additive, no existing
behavior changed.

Co-authored-by: Forge Agent <forge-agent@anthropic.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

agent/webapp.py

@@ -324,12 +324,15 @@ async def get_slack_repo_config(message: str, channel_id: str, thread_ts: str) -
     owner: str | None = None
     name: str | None = None
 
-    if "repo:" in message:
-        match = re.search(r"repo:([^ ]+)", message)
+    if "repo:" in message or "repo " in message:
+        match = re.search(r"repo[: ]([a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+)", message)
         if match:
-            repo = match.group(1).strip()
-            if "/" in repo:
-                owner, name = repo.split("/", 1)
+            owner, name = match.group(1).split("/", 1)
+
+    if not owner or not name:
+        github_match = re.search(r"github\.com/([a-zA-Z0-9_.-]+/[a-zA-Z0-9_.-]+)", message)
+        if github_match:
+            owner, name = github_match.group(1).split("/", 1)
 
     if not owner or not name:
         try:

tests/test_slack_context.py

@@ -206,3 +206,118 @@ def test_get_slack_repo_config_existing_thread_without_repo_uses_default(
     assert threads_client.requested_thread_id == generate_thread_id_from_slack_thread(
         "C123", "1.234"
     )
+
+
+def test_get_slack_repo_config_space_syntax_detected(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """repo owner/name (space instead of colon) should be detected correctly."""
+    threads_client = _FakeThreadsClient(raise_not_found=True)
+
+    async def fake_post_slack_thread_reply(channel_id: str, thread_ts: str, text: str) -> bool:
+        return True
+
+    monkeypatch.setattr(webapp, "get_client", lambda url: _FakeClient(threads_client))
+    monkeypatch.setattr(webapp, "post_slack_thread_reply", fake_post_slack_thread_reply)
+
+    repo = asyncio.run(
+        webapp.get_slack_repo_config(
+            "please fix the bug in repo langchain-ai/langchainjs", "C123", "1.234"
+        )
+    )
+
+    assert repo == {"owner": "langchain-ai", "name": "langchainjs"}
+
+
+def test_get_slack_repo_config_github_url_extracted(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """GitHub URL in message should be used to detect the repo."""
+    threads_client = _FakeThreadsClient(raise_not_found=True)
+
+    async def fake_post_slack_thread_reply(channel_id: str, thread_ts: str, text: str) -> bool:
+        return True
+
+    monkeypatch.setattr(webapp, "get_client", lambda url: _FakeClient(threads_client))
+    monkeypatch.setattr(webapp, "post_slack_thread_reply", fake_post_slack_thread_reply)
+
+    repo = asyncio.run(
+        webapp.get_slack_repo_config(
+            "I found a bug in https://github.com/langchain-ai/langgraph-api please fix it",
+            "C123",
+            "1.234",
+        )
+    )
+
+    assert repo == {"owner": "langchain-ai", "name": "langgraph-api"}
+
+
+def test_get_slack_repo_config_explicit_repo_beats_github_url(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Explicit repo: syntax takes priority over a GitHub URL also present in the message."""
+    threads_client = _FakeThreadsClient(raise_not_found=True)
+
+    async def fake_post_slack_thread_reply(channel_id: str, thread_ts: str, text: str) -> bool:
+        return True
+
+    monkeypatch.setattr(webapp, "get_client", lambda url: _FakeClient(threads_client))
+    monkeypatch.setattr(webapp, "post_slack_thread_reply", fake_post_slack_thread_reply)
+
+    repo = asyncio.run(
+        webapp.get_slack_repo_config(
+            "see https://github.com/langchain-ai/langgraph-api but use repo:my-org/my-repo",
+            "C123",
+            "1.234",
+        )
+    )
+
+    assert repo == {"owner": "my-org", "name": "my-repo"}
+
+
+def test_get_slack_repo_config_explicit_space_syntax_beats_thread_metadata(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Explicit repo owner/name (space syntax) takes priority over saved thread metadata."""
+    threads_client = _FakeThreadsClient(
+        thread={"metadata": {"repo": {"owner": "saved-owner", "name": "saved-repo"}}}
+    )
+
+    async def fake_post_slack_thread_reply(channel_id: str, thread_ts: str, text: str) -> bool:
+        return True
+
+    monkeypatch.setattr(webapp, "get_client", lambda url: _FakeClient(threads_client))
+    monkeypatch.setattr(webapp, "post_slack_thread_reply", fake_post_slack_thread_reply)
+
+    repo = asyncio.run(
+        webapp.get_slack_repo_config(
+            "actually use repo langchain-ai/langchainjs today", "C123", "1.234"
+        )
+    )
+
+    assert repo == {"owner": "langchain-ai", "name": "langchainjs"}
+
+
+def test_get_slack_repo_config_github_url_beats_thread_metadata(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """A GitHub URL in the message takes priority over saved thread metadata."""
+    threads_client = _FakeThreadsClient(
+        thread={"metadata": {"repo": {"owner": "saved-owner", "name": "saved-repo"}}}
+    )
+
+    async def fake_post_slack_thread_reply(channel_id: str, thread_ts: str, text: str) -> bool:
+        return True
+
+    monkeypatch.setattr(webapp, "get_client", lambda url: _FakeClient(threads_client))
+    monkeypatch.setattr(webapp, "post_slack_thread_reply", fake_post_slack_thread_reply)
+
+    repo = asyncio.run(
+        webapp.get_slack_repo_config(
+            "I found a bug in https://github.com/langchain-ai/langgraph-api",
+            "C123",
+            "1.234",
+        )
+    )
+
+    assert repo == {"owner": "langchain-ai", "name": "langgraph-api"}