fix(services): guard workspace discovery fallback

Signed-off-by: Drew Cain <groksrc@gmail.com>

Author: groksrc

src/basic_memory/services/link_resolver.py

@@ -47,10 +47,22 @@ async def detect_project_from_workspace_identifier_prefix(
     if not _workspace_identifier_discovery_available(identifier, config):
         return None
 
-    workspace_resolution = await resolve_workspace_qualified_identifier(
-        identifier,
-        context=context,
+    workspace_discovery_fallback_errors = (
+        "not found",
+        "no accessible workspaces",
+        "unable to discover",
     )
+    try:
+        workspace_resolution = await resolve_workspace_qualified_identifier(
+            identifier,
+            context=context,
+        )
+    except ValueError as exc:
+        message = str(exc).lower()
+        if any(error in message for error in workspace_discovery_fallback_errors):
+            return None
+        raise
+
     if workspace_resolution is None:
         return None
     return workspace_resolution.project_identifier

tests/services/test_link_resolver.py

@@ -205,6 +205,43 @@ async def resolve_workspace_identifier(identifier, context=None):
     assert detected == "team-acme/research"
 
 
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "message",
+    [
+        "Workspace 'team-acme' was not found.",
+        "No accessible workspaces found for this account.",
+        "Unable to discover projects in any accessible workspace. Failed workspaces: team-acme",
+    ],
+)
+async def test_workspace_identifier_project_detection_ignores_discovery_failures(
+    monkeypatch,
+    config_manager,
+    message,
+):
+    """Workspace detection should fall back when cloud discovery is unavailable."""
+    from basic_memory.services import link_resolver
+
+    async def fail_workspace_identifier(identifier, context=None):
+        raise ValueError(message)
+
+    monkeypatch.setattr(
+        "basic_memory.mcp.project_context._workspace_identifier_discovery_available",
+        lambda identifier, config: True,
+    )
+    monkeypatch.setattr(
+        "basic_memory.mcp.project_context.resolve_workspace_qualified_identifier",
+        fail_workspace_identifier,
+    )
+
+    detected = await link_resolver.detect_project_from_workspace_identifier_prefix(
+        "team-acme/research/note",
+        config_manager.config,
+    )
+
+    assert detected is None
+
+
 @pytest.mark.asyncio
 async def test_workspace_identifier_project_detection_allows_mixed_local_cloud_config(
     monkeypatch,