waggle-os/packages/hive-mind-hooks-hermes

@waggle/hive-mind-hooks-hermes

Silent-capture shim that wires Hermes (NousResearch/hermes-agent) lifecycle hooks into hive-mind frames. Every Hermes session deterministically captures session-start / prompt / response events into your personal memory via hive-mind-cli — the same every-turn pattern proven by @waggle/hive-mind-hooks-claude-code, built on the shared @waggle/hive-mind-hooks-core foundation.

Hermes's hook config is a YAML installer with create-if-missing semantics. It targets the SHELL-HOOKS system — the top-level hooks: block in ~/.hermes/config.yaml. It does not touch Hermes's two other "hooks" systems (the directory-based gateway hooks under ~/.hermes/hooks/, or the in-process plugin hooks) — only the shell-hooks block.

Not hook parity with claude-code. Hermes ships only 3 lifecycle hooks — there is no PreCompact event — and splits SessionStart across two events. See the Capture fidelity table below.

Install

npx @waggle/hive-mind-hooks-hermes install
# Windows / production: pin the CLI path
npx @waggle/hive-mind-hooks-hermes install --cli-path "C:\\path\\to\\hive-mind-cli\\dist\\index.js"

The installer additively merges hive-mind shell-hook entries into ~/.hermes/config.yaml (creating the file if absent), preserving any existing hooks you have, and writes a pointer + literal byte-identical backup so uninstall is exact. (YAML re-serialization loses comments and key ordering, so uninstall restores the original bytes rather than a re-serialized diff.)

Headless / gateway consent (IMPORTANT). Hermes keeps a first-use consent allow-list keyed on the exact hook command string. Under a headless / non-TTY launch the hooks register only if hooks_auto_accept: true is in the config (the installer seeds this by default) or HERMES_ACCEPT_HOOKS=1 is set — otherwise they silently never register. Pass --no-auto-accept to manage consent yourself.

npx @waggle/hive-mind-hooks-hermes verify     # smoke-check
npx @waggle/hive-mind-hooks-hermes uninstall  # byte-identical restore (or remove if we created it)

Capture fidelity

Lifecycle	Hermes event(s)	Status	Notes
SessionStart (recall + inject)	on_session_start (observer) + pre_llm_call (is_first_turn)	full (split)	observer side is a no-op; inject side fires on the first turn only and appends { "context": "..." } to the user message (not the system prompt — preserves the prefix cache)
UserPromptSubmit (save temporary)	pre_llm_call	full	the user text arrives at extra.user_message; saved every turn
Stop (summarize + save)	post_llm_call	full	the assistant text arrives at extra.assistant_response; on_session_finalize is gateway-only and is not used
PreCompact (compact memory)	— (none)	opt-in approximation	Hermes ships no compaction hook (VALID_HOOKS has no compact entry) — there is genuinely nothing to bind. Set WAGGLE_HERMES_COMPACT_ON_STOP=1 (default off) to approximate it from the per-turn Stop hook, time-gated by WAGGLE_HERMES_COMPACT_WINDOW_MIN (minutes, default 10) so it runs at most once per window

Disclosures:

• No PreCompact event at all. Hermes has no compaction hook, so the cleanup_frames maintenance step that claude-code runs on PreCompact does not run under Hermes by default. Memory still accrues correctly; only the periodic compaction nudge is absent. Opt-in: set WAGGLE_HERMES_COMPACT_ON_STOP=1 to approximate it from the per-turn Stop hook, time-gated by WAGGLE_HERMES_COMPACT_WINDOW_MIN (minutes, default 10) so the maintenance pass fires at most once per window.
• SessionStart is split across on_session_start (observer) and pre_llm_call (inject). One compiled script is registered under both; it gates injection on is_first_turn so it injects once per session, not every turn.
• Block/inject is via stdout JSON, not exit codes — Hermes has no exit-code-2 contract. Our hooks are capture-only: they emit {} (or the SessionStart { "context": ... }) and exit 0.
• Headless consent — without hooks_auto_accept: true (seeded by default) or HERMES_ACCEPT_HOOKS=1, the hooks silently never register under a headless launch.

How it works

Each hook is a short-lived Node subprocess. Hermes spawns the configured command (shlex.split + shell=False), pipes the event JSON to the hook's stdin, and reads optional JSON back from stdout. The hook shells to hive-mind-cli to recall or save frames, then exits 0. Fail-open: if hive-mind-cli is unreachable or the payload is malformed, the hook logs to stderr and exits 0 — Hermes is never blocked.

License: Apache-2.0.