Context

When any activity data source fails, the endpoint returns 200 OK with partial data and no indication that data is missing. Operators see WARNING logs, but API consumers have no signal.

Proposed Solution

Add a degraded_sources field to the response metadata (or use X-Degraded-Sources header) listing which data sources failed. E.g., "degraded_sources": ["cost_tracker", "tool_invocation_tracker"].

Files

• src/synthorg/api/controllers/activities.py
• Possibly src/synthorg/api/dto.py (PaginatedResponse metadata)

Source

Found during PR #832 review (silent-failure-hunter agent).