hermes-agent bot
b6c53ef0be
feat(hooks): spill oversized hook-injected context to disk
...
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 accidentally (or intentionally)
emits a large blob inflates every turn and blows out the prompt cache
prefix.
This adds a per-hook context cap with disk spill:
- 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.
- run_agent.py: apply the cap at the pre_llm_call aggregation site,
covering both Python plugins and shell hooks (which also flow through
invoke_hook).
- agent/shell_hooks.py: reserve output_spill as a sub-key under hooks:
so the config is schema-friendly and doesn't emit
"unknown hook event" warnings.
- Docs: document the cap and config in build-a-hermes-plugin.md.
Config (all optional, behaviour-preserving when absent):
hooks:
output_spill:
enabled: true # default: true
max_chars: 10000 # default
preview_head: 500 # default
preview_tail: 500 # default
directory: null # default: $HERMES_HOME/hook_outputs
Never raises — spill write failures fall back to a preview-only string
so the model still gets bounded context even if the disk is full.
Tests: 14 new unit tests in tests/tools/test_hook_output_spill.py;
existing tests/agent/test_shell_hooks.py (49 tests) and
tests/hermes_cli/test_plugins.py (62 tests) still pass. E2E validated
with an isolated HERMES_HOME.
Source: https://github.com/openai/codex/pull/21069
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