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7/24/2026
Fixing a None-response crash in hermes-agent permission handling

Fixing a None-response crash in hermes-agent permission handling

Original: The None That Broke Permissions: How a Single Null Crashed Hermes Agent Approvals

Short summary

A bug in NousResearch/hermes-agent caused crashes when ACP clients sent empty permission responses, returning None instead of a decision object. The fix adds a simple guard clause that denies safely instead of crashing, following the fail-safe principle. The author used Google's Antigravity IDE with Gemini 2.5 Pro to trace the call graph and implement the fix.

  • •None response from ACP permission request caused AttributeError crash in hermes-agent
  • •Fix adds guard clause returning 'deny' when result is None, following fail-safe principle
  • •Author used Google Antigravity IDE with Gemini 2.5 Pro for codebase exploration and debugging

Generated with AI, which can make mistakes.

#ai-agents#open-source#ai-tools
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