feat: shell hooks — wire shell scripts as Hermes hook callbacks

Users can declare shell scripts in config.yaml under a hooks: block that
fire on plugin-hook events (pre_tool_call, post_tool_call, pre_llm_call,
subagent_stop, etc). Scripts receive JSON on stdin, can return JSON on
stdout to block tool calls or inject context pre-LLM.

Key design:
- Registers closures on existing PluginManager._hooks dict — zero changes
  to invoke_hook() call sites
- subprocess.run(shell=False) via shlex.split — no shell injection
- First-use consent per (event, command) pair, persisted to allowlist JSON
- Bypass via --accept-hooks, HERMES_ACCEPT_HOOKS=1, or hooks_auto_accept
- hermes hooks list/test/revoke/doctor CLI subcommands
- Adds subagent_stop hook event fired after delegate_task children exit
- Claude Code compatible response shapes accepted

Cherry-picked from PR #13143 by @pefontana.
This commit is contained in:
Peter Fontana 2026-04-20 20:53:20 -07:00 committed by Teknium
parent 34c5c2538e
commit 3988c3c245
14 changed files with 3241 additions and 9 deletions

View file

@ -51,6 +51,19 @@ import sys
from pathlib import Path
from typing import Optional
def _add_accept_hooks_flag(parser) -> None:
"""Attach the ``--accept-hooks`` flag. Shared across every agent
subparser so the flag works regardless of CLI position."""
parser.add_argument(
"--accept-hooks",
action="store_true",
default=argparse.SUPPRESS,
help=(
"Auto-approve unseen shell hooks without a TTY prompt "
"(equivalent to HERMES_ACCEPT_HOOKS=1 / hooks_auto_accept: true)."
),
)
def _require_tty(command_name: str) -> None:
"""Exit with a clear error if stdin is not a terminal.
@ -4092,6 +4105,12 @@ def cmd_webhook(args):
webhook_command(args)
def cmd_hooks(args):
"""Shell-hook inspection and management."""
from hermes_cli.hooks import hooks_command
hooks_command(args)
def cmd_doctor(args):
"""Check configuration and dependencies."""
from hermes_cli.doctor import run_doctor
@ -6371,6 +6390,17 @@ For more help on a command:
default=False,
help="Run in an isolated git worktree (for parallel agents)",
)
parser.add_argument(
"--accept-hooks",
action="store_true",
default=False,
help=(
"Auto-approve any unseen shell hooks declared in config.yaml "
"without a TTY prompt. Equivalent to HERMES_ACCEPT_HOOKS=1 or "
"hooks_auto_accept: true in config.yaml. Use on CI / headless "
"runs that can't prompt."
),
)
parser.add_argument(
"--skills",
"-s",
@ -6493,6 +6523,16 @@ For more help on a command:
default=argparse.SUPPRESS,
help="Run in an isolated git worktree (for parallel agents on the same repo)",
)
chat_parser.add_argument(
"--accept-hooks",
action="store_true",
default=argparse.SUPPRESS,
help=(
"Auto-approve any unseen shell hooks declared in config.yaml "
"without a TTY prompt (see also HERMES_ACCEPT_HOOKS env var and "
"hooks_auto_accept: in config.yaml)."
),
)
chat_parser.add_argument(
"--checkpoints",
action="store_true",
@ -6612,6 +6652,8 @@ For more help on a command:
action="store_true",
help="Replace any existing gateway instance (useful for systemd)",
)
_add_accept_hooks_flag(gateway_run)
_add_accept_hooks_flag(gateway_parser)
# gateway start
gateway_start = gateway_subparsers.add_parser(
@ -6976,6 +7018,7 @@ For more help on a command:
"run", help="Run a job on the next scheduler tick"
)
cron_run.add_argument("job_id", help="Job ID to trigger")
_add_accept_hooks_flag(cron_run)
cron_remove = cron_subparsers.add_parser(
"remove", aliases=["rm", "delete"], help="Remove a scheduled job"
@ -6986,8 +7029,9 @@ For more help on a command:
cron_subparsers.add_parser("status", help="Check if cron scheduler is running")
# cron tick (mostly for debugging)
cron_subparsers.add_parser("tick", help="Run due jobs once and exit")
cron_tick = cron_subparsers.add_parser("tick", help="Run due jobs once and exit")
_add_accept_hooks_flag(cron_tick)
_add_accept_hooks_flag(cron_parser)
cron_parser.set_defaults(func=cmd_cron)
# =========================================================================
@ -7054,6 +7098,67 @@ For more help on a command:
webhook_parser.set_defaults(func=cmd_webhook)
# =========================================================================
# hooks command — shell-hook inspection and management
# =========================================================================
hooks_parser = subparsers.add_parser(
"hooks",
help="Inspect and manage shell-script hooks",
description=(
"Inspect shell-script hooks declared in ~/.hermes/config.yaml, "
"test them against synthetic payloads, and manage the first-use "
"consent allowlist at ~/.hermes/shell-hooks-allowlist.json."
),
)
hooks_subparsers = hooks_parser.add_subparsers(dest="hooks_action")
hooks_subparsers.add_parser(
"list", aliases=["ls"],
help="List configured hooks with matcher, timeout, and consent status",
)
_hk_test = hooks_subparsers.add_parser(
"test",
help="Fire every hook matching <event> against a synthetic payload",
)
_hk_test.add_argument(
"event",
help="Hook event name (e.g. pre_tool_call, pre_llm_call, subagent_stop)",
)
_hk_test.add_argument(
"--for-tool", dest="for_tool", default=None,
help=(
"Only fire hooks whose matcher matches this tool name "
"(used for pre_tool_call / post_tool_call)"
),
)
_hk_test.add_argument(
"--payload-file", dest="payload_file", default=None,
help=(
"Path to a JSON file whose contents are merged into the "
"synthetic payload before execution"
),
)
_hk_revoke = hooks_subparsers.add_parser(
"revoke", aliases=["remove", "rm"],
help="Remove a command's allowlist entries (takes effect on next restart)",
)
_hk_revoke.add_argument(
"command",
help="The exact command string to revoke (as declared in config.yaml)",
)
hooks_subparsers.add_parser(
"doctor",
help=(
"Check each configured hook: exec bit, allowlist, mtime drift, "
"JSON validity, and synthetic run timing"
),
)
hooks_parser.set_defaults(func=cmd_hooks)
# =========================================================================
# doctor command
# =========================================================================
@ -7727,6 +7832,7 @@ Examples:
action="store_true",
help="Enable verbose logging on stderr",
)
_add_accept_hooks_flag(mcp_serve_p)
mcp_add_p = mcp_sub.add_parser(
"add", help="Add an MCP server (discovery-first install)"
@ -7765,6 +7871,8 @@ Examples:
)
mcp_login_p.add_argument("name", help="Server name to re-authenticate")
_add_accept_hooks_flag(mcp_parser)
def cmd_mcp(args):
from hermes_cli.mcp_config import mcp_command
@ -8176,6 +8284,7 @@ Examples:
help="Run Hermes Agent as an ACP (Agent Client Protocol) server",
description="Start Hermes Agent in ACP mode for editor integration (VS Code, Zed, JetBrains)",
)
_add_accept_hooks_flag(acp_parser)
def cmd_acp(args):
"""Launch Hermes Agent as an ACP server."""
@ -8449,6 +8558,42 @@ Examples:
cmd_version(args)
return
# Discover Python plugins and register shell hooks once, before any
# command that can fire lifecycle hooks. Both are idempotent; gated
# so introspection/management commands (hermes hooks list, cron
# list, gateway status, mcp add, ...) don't pay discovery cost or
# trigger consent prompts for hooks the user is still inspecting.
# Groups with mixed admin/CRUD vs. agent-running entries narrow via
# the nested subcommand (dest varies by parser).
_AGENT_COMMANDS = {None, "chat", "acp", "rl"}
_AGENT_SUBCOMMANDS = {
"cron": ("cron_command", {"run", "tick"}),
"gateway": ("gateway_command", {"run"}),
"mcp": ("mcp_action", {"serve"}),
}
_sub_attr, _sub_set = _AGENT_SUBCOMMANDS.get(args.command, (None, None))
if (
args.command in _AGENT_COMMANDS
or (_sub_attr and getattr(args, _sub_attr, None) in _sub_set)
):
_accept_hooks = bool(getattr(args, "accept_hooks", False))
try:
from hermes_cli.plugins import discover_plugins
discover_plugins()
except Exception:
logger.debug(
"plugin discovery failed at CLI startup", exc_info=True,
)
try:
from hermes_cli.config import load_config
from agent.shell_hooks import register_from_config
register_from_config(load_config(), accept_hooks=_accept_hooks)
except Exception:
logger.debug(
"shell-hook registration failed at CLI startup",
exc_info=True,
)
# Handle top-level --resume / --continue as shortcut to chat
if (args.resume or args.continue_last) and args.command is None:
args.command = "chat"