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eab208db70
Port from openai/codex#21069 ("Spill large hook outputs from context"). Both shell hooks and Python plugins can return {"context": "..."} from pre_llm_call, which gets appended to the current turn's user message on every subsequent API call. A plugin that emits a large blob inflates every turn and blows out the prompt cache prefix. - tools/hook_output_spill.py: shared helper that writes oversized context to $HERMES_HOME/hook_outputs/<session_id>/<uuid>.txt and returns a head/tail preview plus the saved path. Never raises. - agent/turn_context.py: apply the cap at the pre_llm_call aggregation site (moved here from run_agent.py since the original PR), covering both Python plugins and shell hooks. - agent/shell_hooks.py: reserve output_spill as a sub-key under hooks: so the config block doesn't emit unknown-hook-event warnings. - Docs: document the cap + config in build-a-hermes-plugin.md. Config (behaviour-preserving when absent): hooks.output_spill: enabled/max_chars/preview_head/preview_tail/directory Tests: 14 unit tests; shell_hooks (56) and plugins (100) suites green. E2E validated with isolated HERMES_HOME (spill, passthrough, traversal sanitisation, reserved-key skip). |
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