Every A2A response now includes a tool_trace — the list of tools/commands
the agent actually invoked during execution. This enables verifying agent
claims against what they actually did, catches hallucinated "I checked X"
responses, and provides an audit trail for the CEO to control hundreds of
agents by checking the top-level PM's trace.
Changes:
- Python runtime: collect tool name/input/output_preview on every
on_tool_start/on_tool_end event, embed in Message.metadata.tool_trace
- Go platform: extract tool_trace from A2A response metadata, store in
new activity_logs.tool_trace JSONB column with GIN index
- Activity API: expose tool_trace in List and broadcast endpoints
- Migration 039: adds tool_trace column + GIN index
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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