Gemini v0.29.5
~/src/github.com/example/agents · main · started 23d 18h ago · lasted 7m
25 msgs · 180k tokens · d37d035f-f749-419b-afaf-3080f906df14
  Prompt: # Bug Investigation: Go CLI process crash during agent delegation
  Activity: 5 read · 23 tools
  
  Last response:
    I have identified the root cause of the Go CLI process crash during agent delegation and prepared the necessary fix.
    
    ### Root Cause Analysis
    
    The Go runtime panic originates from the hook system in harness/agent/hooks.go. While the Execute method in harness/agent/agent.go (line 527) correctly uses recover() to handle panics within the main execution thread, it does not protect against panics in goroutines spawned for asynchronous hooks.
    
    In Go, a panic in a goroutine that is not caught by recover() within that same goroutine will terminate the entire process. The hook system spawns these unprotected goroutines in two places:
    
        1. **`emitEventWithWait`** (lines 53-65): Spawns goroutines for pre-tool events (e.g., `EventToolCallStart`).
        2. **`emitEventImmediate`** (lines 102-108): Spawns goroutines for post-tool and error events.
    
    When a child agent is executed during delegation, it emits an EventExecutionStart via emitEventImmediate. If a registered hook panics during this process, the entire CLI crashes instantly.
    
    ### Recommended Fix
    
    … (42 more lines)
