Hermes-ui/packages/server/src/services/hermes/agent-bridge/hermes_bridge.py

#!/usr/bin/env python3
"""Hermes in-process agent bridge.

This service intentionally lives outside the existing Web UI chat path. It
imports hermes-agent from HERMES_AGENT_ROOT (default: ~/.hermes/hermes-agent),
keeps AIAgent instances in memory by session_id, and exposes a small newline-
delimited JSON request/response protocol over a local socket.
"""

from __future__ import annotations

import argparse
import atexit
import copy
import errno
import hashlib
import importlib.util
import json
import locale
import os
import queue
import signal
import shutil
import socket
import subprocess
import sys
import tempfile
import threading
import time
import traceback
import uuid
from contextlib import contextmanager
from dataclasses import dataclass, field
from pathlib import Path
from urllib.parse import urlparse
from typing import Any, Callable


DEFAULT_ENDPOINT = "tcp://127.0.0.1:18765" if os.name == "nt" else "ipc:///tmp/hermes-agent-bridge.sock"
DEFAULT_AGENT_ROOT = "~/.hermes/hermes-agent"
DEFAULT_HERMES_HOME = "~/.hermes"
APPROVAL_TIMEOUT_SECONDS = 120
APPROVAL_TIMEOUT_MS = APPROVAL_TIMEOUT_SECONDS * 1000
PARENT_WATCHDOG_INTERVAL_SECONDS = 2.0


def _bridge_platform() -> str:
    return os.environ.get("HERMES_AGENT_BRIDGE_PLATFORM", "cli").strip() or "cli"


def _positive_int(value: str | None) -> int | None:
    if not value:
        return None
    try:
        parsed = int(value)
    except (TypeError, ValueError):
        return None
    return parsed if parsed > 0 else None


def _process_exists(pid: int) -> bool:
    if pid <= 0:
        return False
    if os.name == "nt":
        try:
            result = subprocess.run(
                ["tasklist.exe", "/FI", f"PID eq {pid}", "/NH"],
                check=False,
                capture_output=True,
                text=True,
                timeout=5,
            )
            return str(pid) in (result.stdout or "")
        except Exception:
            return True
    try:
        os.kill(pid, 0)
        return True
    except ProcessLookupError:
        return False
    except PermissionError:
        return True
    except OSError as exc:
        return exc.errno != errno.ESRCH


def _start_parent_process_watchdog(
    parent_pid: int | None,
    stop_event: threading.Event,
    label: str,
    interval: float = PARENT_WATCHDOG_INTERVAL_SECONDS,
) -> None:
    if not parent_pid or parent_pid == os.getpid():
        return

    def run() -> None:
        while not stop_event.wait(interval):
            if _process_exists(parent_pid):
                continue
            print(
                f"[hermes-bridge] parent pid {parent_pid} exited; stopping {label}",
                file=sys.stderr,
                flush=True,
            )
            stop_event.set()
            return

    threading.Thread(target=run, daemon=True, name=f"hermes-bridge-parent-watchdog-{label}").start()


def _install_stop_signal_handlers(stop_event: threading.Event) -> Callable[[], None]:
    if threading.current_thread() is not threading.main_thread():
        return lambda: None

    previous: list[tuple[signal.Signals, Any]] = []

    def handle_signal(signum: int, _frame: Any) -> None:
        stop_event.set()

    for signum in (signal.SIGINT, signal.SIGTERM):
        try:
            sig = signal.Signals(signum)
            previous.append((sig, signal.getsignal(sig)))
            signal.signal(sig, handle_signal)
        except Exception:
            pass

    def restore() -> None:
        for sig, handler in previous:
            try:
                signal.signal(sig, handler)
            except Exception:
                pass

    return restore


def _suppress_bridge_platform_hint() -> None:
    raw = os.environ.get("HERMES_BRIDGE_SUPPRESS_PLATFORM_HINT", "cli").strip()
    if raw.lower() in {"0", "false", "no", "off"}:
        return
    targets = {part.strip().lower() for part in raw.split(",") if part.strip()}
    if not targets:
        return
    try:
        from agent import prompt_builder

        for target in targets:
            prompt_builder.PLATFORM_HINTS.pop(target, None)
    except Exception:
        pass

    run_agent_module = sys.modules.get("run_agent")
    hints = getattr(run_agent_module, "PLATFORM_HINTS", None)
    if isinstance(hints, dict):
        for target in targets:
            hints.pop(target, None)


def _candidate_agent_roots(raw: str | None = None) -> list[Path]:
    candidates: list[Path] = []
    if raw:
        candidates.append(Path(raw).expanduser())

    env_root = os.environ.get("HERMES_AGENT_ROOT")
    if env_root:
        candidates.append(Path(env_root).expanduser())

    hermes_bin = shutil.which(os.environ.get("HERMES_BIN", "hermes"))
    if hermes_bin:
        bin_path = Path(hermes_bin).resolve()
        candidates.extend([
            bin_path.parent.parent,
            bin_path.parent.parent.parent,
            bin_path.parent.parent / "hermes-agent",
        ])

    script_path = Path(__file__).resolve()
    candidates.extend([
        Path.cwd(),
        Path.cwd() / ".hermes" / "hermes-agent",
        Path.cwd() / "hermes-agent",
        script_path.parent,
        script_path.parent.parent,
        script_path.parent.parent.parent,
        script_path.parent.parent.parent / ".hermes" / "hermes-agent",
    ])
    for parent in script_path.parents:
        candidates.extend([
            parent / ".hermes" / "hermes-agent",
            parent / "hermes-agent",
        ])

    candidates.extend([
        Path.home() / ".hermes" / "hermes-agent",
        Path.home() / "hermes-agent",
        Path("/opt/hermes/hermes-agent"),
        Path("/opt/hermes-agent"),
        Path("/usr/local/lib/hermes-agent"),
        Path("/usr/local/hermes-agent"),
    ])
    candidates.append(Path(DEFAULT_AGENT_ROOT).expanduser())

    unique: list[Path] = []
    seen: set[str] = set()
    for candidate in candidates:
        try:
            resolved = candidate.resolve()
        except OSError:
            resolved = candidate
        key = str(resolved)
        if key not in seen:
            seen.add(key)
            unique.append(resolved)
    return unique


def _find_agent_root(raw: str | None = None) -> Path | None:
    for candidate in _candidate_agent_roots(raw):
        if (candidate / "run_agent.py").exists():
            return candidate
    return None


def _discover_agent_root(raw: str | None = None) -> Path:
    root = _find_agent_root(raw)
    if root is not None:
        return root
    attempted = ", ".join(str(path) for path in _candidate_agent_roots(raw))
    raise RuntimeError(
        "hermes-agent run_agent.py not found. Pass --agent-root or set "
        f"HERMES_AGENT_ROOT. Tried: {attempted}"
    )


def _discover_hermes_home(raw: str | None = None) -> Path:
    if raw:
        return Path(raw).expanduser().resolve()
    env_home = os.environ.get("HERMES_HOME")
    if env_home:
        return Path(env_home).expanduser().resolve()
    return Path(DEFAULT_HERMES_HOME).expanduser().resolve()


def _normalize_base_home(home: Path) -> Path:
    if home.parent.name == "profiles":
        return home.parent.parent
    return home


def _jsonable(value: Any) -> Any:
    try:
        json.dumps(value)
        return value
    except TypeError:
        if isinstance(value, dict):
            return {str(k): _jsonable(v) for k, v in value.items()}
        if isinstance(value, (list, tuple)):
            return [_jsonable(v) for v in value]
        return str(value)


def _agent_root() -> Path | None:
    return _find_agent_root(os.environ.get("HERMES_AGENT_ROOT"))


def _hermes_home() -> Path:
    return _discover_hermes_home(os.environ.get("HERMES_HOME"))


def _base_hermes_home() -> Path:
    return _normalize_base_home(_discover_hermes_home(os.environ.get("HERMES_AGENT_BRIDGE_BASE_HOME") or DEFAULT_HERMES_HOME))


def _worker_profile() -> str | None:
    raw = os.environ.get("HERMES_AGENT_BRIDGE_WORKER_PROFILE", "").strip()
    return raw or None


def _profile_home(profile: str | None) -> Path:
    base = _base_hermes_home()
    if not profile or profile == "default":
        return base
    profile_home = base / "profiles" / profile
    return profile_home if profile_home.exists() else base


def _read_dotenv(path: Path) -> dict[str, str]:
    if not path.exists():
        return {}
    values: dict[str, str] = {}
    try:
        for line in path.read_text(encoding="utf-8").splitlines():
            stripped = line.strip()
            if not stripped or stripped.startswith("#") or "=" not in stripped:
                continue
            if stripped.startswith("export "):
                stripped = stripped[7:].strip()
            key, value = stripped.split("=", 1)
            key = key.strip()
            if not key or not (key[0].isalpha() or key[0] == "_"):
                continue
            if not all(ch.isalnum() or ch == "_" for ch in key):
                continue
            value = value.strip()
            if (value.startswith('"') and value.endswith('"')) or (value.startswith("'") and value.endswith("'")):
                value = value[1:-1]
            values[key] = value
        return values
    except Exception:
        return {}


def _profile_dotenv_keys() -> set[str]:
    base = _base_hermes_home()
    keys = set(_read_dotenv(base / ".env").keys())
    profiles_dir = base / "profiles"
    try:
        for entry in profiles_dir.iterdir():
            if entry.is_dir():
                keys.update(_read_dotenv(entry / ".env").keys())
    except Exception:
        pass
    return keys


def _set_path_env(agent_root: str | None = None, hermes_home: str | None = None) -> None:
    resolved_root = _discover_agent_root(agent_root) if agent_root else _find_agent_root()
    if resolved_root is not None:
        os.environ["HERMES_AGENT_ROOT"] = str(resolved_root)
    else:
        os.environ.pop("HERMES_AGENT_ROOT", None)
    resolved_home = _discover_hermes_home(hermes_home)
    os.environ["HERMES_HOME"] = str(resolved_home)
    os.environ["HERMES_AGENT_BRIDGE_BASE_HOME"] = str(_normalize_base_home(resolved_home))


def _ensure_agent_imports() -> None:
    root = _agent_root()
    if root is not None:
        root_s = str(root)
        if root_s not in sys.path:
            sys.path.insert(0, root_s)
    elif importlib.util.find_spec("run_agent") is None:
        raise RuntimeError(
            "hermes-agent run_agent.py not found in source locations and the "
            "current Python environment cannot import run_agent. Install "
            "hermes-agent or pass --agent-root/HERMES_AGENT_ROOT."
        )
    os.environ.setdefault("HERMES_HOME", str(_hermes_home()))
    os.environ.setdefault("HERMES_AGENT_BRIDGE_BASE_HOME", str(_hermes_home()))


def _load_cfg(profile: str | None = None) -> dict[str, Any]:
    _ensure_agent_imports()
    try:
        from hermes_cli.config import load_config

        cfg = load_config()
        return cfg if isinstance(cfg, dict) else {}
    except Exception:
        try:
            import yaml

            path = _hermes_home() / "config.yaml"
            if not path.exists():
                return {}
            return yaml.safe_load(path.read_text(encoding="utf-8")) or {}
        except Exception:
            return {}


def _apply_profile_env(profile: str | None) -> str | None:
    """Temporarily set HERMES_HOME to the profile directory.
    Returns the original HERMES_HOME value to restore later.
    """
    profile_home = _profile_home(profile)
    if not (profile_home / "config.yaml").exists():
        return os.environ.get("HERMES_HOME")
    original = os.environ.get("HERMES_HOME")
    os.environ["HERMES_HOME"] = str(profile_home)
    return original


def _restore_profile_env(original: str | None) -> None:
    """Restore HERMES_HOME after profile-scoped agent creation."""
    if original is not None:
        os.environ["HERMES_HOME"] = original
    else:
        os.environ.pop("HERMES_HOME", None)


def _apply_profile_dotenv(profile: str | None) -> dict[str, str | None]:
    """Load only the active profile's .env into this bridge process.

    This mirrors Web UI gateway env isolation:
    - default keeps inherited env for compatibility, then overlays default .env
    - non-default clears keys seen in any profile .env, then overlays its .env
    The returned snapshot restores the bridge process after the agent call.
    """
    values = _read_dotenv(_profile_home(profile) / ".env")
    if profile and profile != "default":
        keys = _profile_dotenv_keys()
        keys.update(values.keys())
    else:
        keys = set(values.keys())
    snapshot = {key: os.environ.get(key) for key in keys}

    if profile and profile != "default":
        for key in keys:
            os.environ.pop(key, None)
    for key, value in values.items():
        os.environ[key] = value
    return snapshot


def _restore_profile_dotenv(snapshot: dict[str, str | None]) -> None:
    for key, value in snapshot.items():
        if value is None:
            os.environ.pop(key, None)
        else:
            os.environ[key] = value


def _set_worker_profile_env(profile: str | None) -> None:
    profile_home = _profile_home(profile)
    os.environ["HERMES_HOME"] = str(profile_home)
    os.environ["HERMES_AGENT_BRIDGE_WORKER_PROFILE"] = profile or "default"
    values = _read_dotenv(profile_home / ".env")
    for key, value in values.items():
        os.environ[key] = value


@contextmanager
def _profile_env(profile: str | None):
    if _worker_profile():
        yield
        return
    original = _apply_profile_env(profile)
    env_snapshot = _apply_profile_dotenv(profile)
    try:
        yield
    finally:
        _restore_profile_dotenv(env_snapshot)
        _restore_profile_env(original)


def _resolve_model(cfg: dict[str, Any]) -> str:
    env_model = (
        os.environ.get("HERMES_MODEL", "")
        or os.environ.get("HERMES_INFERENCE_MODEL", "")
    ).strip()
    if env_model:
        return env_model
    model_cfg = cfg.get("model", "")
    if isinstance(model_cfg, dict):
        return str(model_cfg.get("default") or "").strip()
    if isinstance(model_cfg, str):
        return model_cfg.strip()
    return ""


def _resolve_runtime(model: str, provider: str | None = None) -> dict[str, Any]:
    _ensure_agent_imports()
    from hermes_cli.runtime_provider import resolve_runtime_provider

    requested = provider or os.environ.get("HERMES_BRIDGE_PROVIDER", "").strip() or None
    return resolve_runtime_provider(requested=requested, target_model=model or None)


def _load_enabled_toolsets() -> list[str] | None:
    _ensure_agent_imports()
    raw = os.environ.get("HERMES_BRIDGE_TOOLSETS", "").strip()
    if raw:
        values = [part.strip() for part in raw.split(",") if part.strip()]
        if any(value in {"all", "*"} for value in values):
            return None
        return values or None

    try:
        from hermes_cli.config import load_config
        from hermes_cli.tools_config import _get_platform_tools
        from toolsets import resolve_toolset

        cfg = load_config()
        platform = _bridge_platform()
        enabled = sorted(_get_platform_tools(cfg, platform, include_default_mcp_servers=True))
        if platform != "cli":
            resolved_tools: set[str] = set()
            for toolset_name in enabled:
                try:
                    resolved_tools.update(resolve_toolset(toolset_name))
                except Exception:
                    pass
            if not resolved_tools:
                enabled = sorted(_get_platform_tools(cfg, "cli", include_default_mcp_servers=True))
        return enabled or None
    except Exception:
        return None


def _load_reasoning_config() -> dict[str, Any] | None:
    _ensure_agent_imports()
    try:
        from hermes_constants import parse_reasoning_effort

        effort = str((_load_cfg().get("agent") or {}).get("reasoning_effort", "") or "").strip()
        return parse_reasoning_effort(effort)
    except Exception:
        return None


def _load_service_tier() -> str | None:
    raw = str((_load_cfg().get("agent") or {}).get("service_tier", "") or "").strip().lower()
    if raw in {"fast", "priority", "on"}:
        return "priority"
    return None


def _cfg_max_turns(cfg: dict[str, Any], default: int = 90) -> int:
    try:
        env_max = int(os.environ.get("HERMES_BRIDGE_MAX_TURNS", "") or 0)
        if env_max > 0:
            return env_max
    except ValueError:
        pass
    agent_cfg = cfg.get("agent") or {}
    try:
        return int(agent_cfg.get("max_turns") or cfg.get("max_turns") or default)
    except (TypeError, ValueError):
        return default


class SessionDbHolder:
    def __init__(self) -> None:
        self._lock = threading.Lock()
        self._db_by_path: dict[str, Any] = {}
        self._error: str | None = None

    def get(self, db_path: Path | None = None):
        with self._lock:
            key = str((db_path or (_base_hermes_home() / "state.db")).resolve())
            if key in self._db_by_path:
                return self._db_by_path[key]
            _ensure_agent_imports()
            try:
                from hermes_state import SessionDB

                db = SessionDB(db_path=Path(key))
                self._db_by_path[key] = db
                self._error = None
                return db
            except Exception as exc:
                self._error = str(exc)
                return None

    @property
    def error(self) -> str | None:
        return self._error

    def get_for_profile(self, profile: str | None) -> Any:
        """Get a SessionDB for the given profile using an explicit DB path."""
        return self.get(_profile_home(profile) / "state.db")


@dataclass
class RunRecord:
    run_id: str
    session_id: str
    status: str = "running"
    started_at: float = field(default_factory=time.time)
    ended_at: float | None = None
    result: dict[str, Any] | None = None
    error: str | None = None
    deltas: list[str] = field(default_factory=list)
    events: list[dict[str, Any]] = field(default_factory=list)


@dataclass
class AgentSession:
    session_id: str
    agent: Any
    history: list[dict[str, Any]] = field(default_factory=list)
    config: dict[str, Any] = field(default_factory=dict)
    running: bool = False
    current_run_id: str | None = None
    lock: threading.RLock = field(default_factory=threading.RLock)
    created_at: float = field(default_factory=time.time)
    last_used_at: float = field(default_factory=time.time)


class AgentPool:
    def __init__(self) -> None:
        self._sessions: dict[str, AgentSession] = {}
        self._runs: dict[str, RunRecord] = {}
        self._lock = threading.RLock()
        self._db = SessionDbHolder()
        self._approval_requests: dict[str, queue.Queue[str]] = {}
        self._gateway_approval_requests: dict[str, str] = {}
        self._compression_requests: dict[str, queue.Queue[dict[str, Any]]] = {}
        self._run_context = threading.local()
        self._approval_handlers: dict[str, Callable[..., str]] = {}
        self._exec_ask_depth = 0
        self._exec_ask_previous: str | None = None

    def get_or_create(
        self,
        session_id: str,
        profile: str | None = None,
        model: str | None = None,
        provider: str | None = None,
    ) -> AgentSession:
        requested_model = str(model or "").strip()
        requested_provider = str(provider or "").strip()
        with self._lock:
            existing = self._sessions.get(session_id)
            if existing is not None:
                # If profile changed, destroy old session and recreate
                config_changed = bool(
                    (profile and existing.config.get("profile") != profile)
                    or (requested_model and existing.config.get("model") != requested_model)
                    or (requested_provider and existing.config.get("provider") != requested_provider)
                )
                if config_changed:
                    if not existing.running:
                        self._destroy_session(session_id)
                    else:
                        existing.last_used_at = time.time()
                        return existing
                else:
                    existing.last_used_at = time.time()
                    return existing

            _ensure_agent_imports()
            _suppress_bridge_platform_hint()
            from run_agent import AIAgent

            with _profile_env(profile):
                cfg = _load_cfg()
                resolved_model = requested_model or _resolve_model(cfg)
                runtime = _resolve_runtime(resolved_model, requested_provider or None)
                agent_cfg = cfg.get("agent") or {}
                prompt = str(agent_cfg.get("system_prompt", "") or "").strip() or None

                agent = AIAgent(
                    model=resolved_model,
                    max_iterations=_cfg_max_turns(cfg, 90),
                    provider=runtime.get("provider"),
                    base_url=runtime.get("base_url"),
                    api_key=runtime.get("api_key"),
                    api_mode=runtime.get("api_mode"),
                    acp_command=runtime.get("command"),
                    acp_args=runtime.get("args"),
                    credential_pool=runtime.get("credential_pool"),
                    quiet_mode=True,
                    verbose_logging=False,
                    reasoning_config=_load_reasoning_config(),
                    service_tier=_load_service_tier(),
                    enabled_toolsets=_load_enabled_toolsets(),
                    platform=_bridge_platform(),
                    session_id=session_id,
                    session_db=self._db.get_for_profile(profile),
                    ephemeral_system_prompt=prompt,
                    status_callback=self._status_callback(session_id),
                    thinking_callback=self._text_event_callback(session_id, "thinking.delta"),
                    reasoning_callback=self._text_event_callback(session_id, "reasoning.delta"),
                    tool_progress_callback=self._tool_progress_callback(session_id),
                    tool_start_callback=self._tool_start_callback(session_id),
                    tool_complete_callback=self._tool_complete_callback(session_id),
                )
                agent.compression_enabled = False
                self._install_compression_hook(agent, session_id)

                session = AgentSession(
                    session_id=session_id,
                    agent=agent,
                    history=[],
                    config={
                        "requested_session_id": session_id,
                        "profile": profile or "default",
                        "model": resolved_model,
                        "provider": runtime.get("provider"),
                        "base_url": runtime.get("base_url"),
                        "api_mode": runtime.get("api_mode"),
                        "platform": _bridge_platform(),
                        "resumed": False,
                        "resumed_message_count": 0,
                        "db_error": self._db.error,
                    },
                )
                self._sessions[session_id] = session
                return session

    def _install_compression_hook(self, agent: Any, session_id: str) -> None:
        original = getattr(agent, "_compress_context", None)
        if not callable(original):
            return

        def wrapped_compress_context(messages, system_message, **kwargs):
            before_count = len(messages) if isinstance(messages, list) else 0
            approx_tokens = kwargs.get("approx_tokens")
            if not isinstance(approx_tokens, int) or approx_tokens <= 0:
                approx_tokens = self._estimate_context_tokens(agent, messages, system_message)
            print(
                "[hermes_bridge] compression requested "
                f"session={session_id} messages={before_count} "
                f"tokens={approx_tokens if approx_tokens is not None else 'unknown'} "
                f"focus={kwargs.get('focus_topic') or ''}",
                file=sys.stderr,
                flush=True,
            )
            request_id = uuid.uuid4().hex
            response_queue: queue.Queue[dict[str, Any]] = queue.Queue(maxsize=1)
            with self._lock:
                self._compression_requests[request_id] = response_queue
            self._append_event(session_id, {
                "event": "bridge.compression.requested",
                "request_id": request_id,
                "message_count": before_count,
                "approx_tokens": approx_tokens,
                "focus_topic": kwargs.get("focus_topic"),
                "messages": _jsonable(messages),
            })
            try:
                response = response_queue.get(timeout=180)
                if response.get("error"):
                    raise RuntimeError(str(response.get("error")))
                compressed_messages = response.get("messages")
                if not isinstance(compressed_messages, list):
                    raise RuntimeError("bridge compression response missing messages")
                next_system_message = response.get("system_message", system_message)
                result_approx_tokens = self._estimate_context_tokens(agent, compressed_messages, next_system_message)
                self._append_event(session_id, {
                    "event": "bridge.compression.completed",
                    "request_id": request_id,
                    "message_count": before_count,
                    "result_messages": len(compressed_messages),
                    "approx_tokens": approx_tokens,
                    "result_approx_tokens": result_approx_tokens,
                    "compressed": True,
                })
                return compressed_messages, next_system_message
            except queue.Empty:
                self._append_event(session_id, {
                    "event": "bridge.compression.failed",
                    "request_id": request_id,
                    "message_count": before_count,
                    "approx_tokens": approx_tokens,
                    "error": "bridge compression timed out",
                })
                raise RuntimeError("bridge compression timed out")
            except Exception as exc:
                self._append_event(session_id, {
                    "event": "bridge.compression.failed",
                    "request_id": request_id,
                    "message_count": before_count,
                    "approx_tokens": approx_tokens,
                    "error": str(exc),
                })
                raise
            finally:
                with self._lock:
                    self._compression_requests.pop(request_id, None)

        agent._compress_context = wrapped_compress_context

    def _agent_system_prompt(self, agent: Any, system_message: Any = None) -> str:
        prompt = str(getattr(agent, "_cached_system_prompt", "") or "")
        if prompt:
            return prompt
        try:
            build_prompt = getattr(agent, "_build_system_prompt", None)
            if callable(build_prompt):
                return str(build_prompt(system_message) or "")
        except Exception:
            return str(system_message or "")
        return str(system_message or "")

    def _agent_tool_names(self, tools: Any) -> list[str]:
        if not isinstance(tools, list):
            return []
        names: list[str] = []
        for tool in tools:
            name = ""
            if isinstance(tool, dict):
                function = tool.get("function")
                if isinstance(function, dict):
                    name = str(function.get("name") or "")
                if not name:
                    name = str(tool.get("name") or "")
            else:
                name = str(getattr(tool, "name", "") or "")
            if name:
                names.append(name)
        return names

    def _estimate_context_info(self, agent: Any, messages: Any, system_message: Any = None) -> dict[str, Any]:
        try:
            from agent.model_metadata import estimate_request_tokens_rough
        except Exception:
            return {}

        prompt = self._agent_system_prompt(agent, system_message)
        tools = getattr(agent, "tools", None) or []
        message_list = messages if isinstance(messages, list) else []
        try:
            token_count = estimate_request_tokens_rough(message_list, system_prompt=prompt, tools=tools or None)
            fixed_context_tokens = estimate_request_tokens_rough([], system_prompt=prompt, tools=tools or None)
            system_prompt_tokens = estimate_request_tokens_rough([], system_prompt=prompt, tools=None)
            tool_tokens = max(0, int(fixed_context_tokens or 0) - int(system_prompt_tokens or 0))
            return {
                "token_count": int(token_count) if isinstance(token_count, (int, float)) and token_count > 0 else None,
                "fixed_context_tokens": int(fixed_context_tokens) if isinstance(fixed_context_tokens, (int, float)) and fixed_context_tokens >= 0 else None,
                "system_prompt_tokens": int(system_prompt_tokens) if isinstance(system_prompt_tokens, (int, float)) and system_prompt_tokens >= 0 else None,
                "tool_tokens": tool_tokens,
                "message_count": len(message_list),
                "tool_count": len(tools) if isinstance(tools, list) else 0,
                "tool_names": self._agent_tool_names(tools),
                "system_prompt_chars": len(prompt),
            }
        except Exception:
            return {}

    def _estimate_context_tokens(self, agent: Any, messages: Any, system_message: Any = None) -> int | None:
        token_count = self._estimate_context_info(agent, messages, system_message).get("token_count")
        return int(token_count) if isinstance(token_count, (int, float)) and token_count > 0 else None

    def _bridge_context_ready_event(self, session: AgentSession, instructions: str | None, profile: str | None) -> dict[str, Any]:
        info = self._estimate_context_info(session.agent, [], instructions)
        event = {
            "event": "bridge.context.ready",
            "session_id": session.session_id,
            "profile": profile or session.config.get("profile") or "default",
            "model": session.config.get("model"),
            "provider": session.config.get("provider"),
            **info,
        }
        session.config["context_info"] = event
        return event

    def estimate_context(
        self,
        session_id: str,
        messages: list[dict[str, Any]] | None = None,
        instructions: str | None = None,
        profile: str | None = None,
        model: str | None = None,
        provider: str | None = None,
    ) -> dict[str, Any]:
        session = self.get_or_create(session_id, profile=profile, model=model, provider=provider)
        context_info = self._estimate_context_info(session.agent, messages or [], instructions)
        print(
            "[hermes_bridge] context estimate "
            f"session={session_id} profile={profile or 'default'} "
            f"messages={len(messages or [])} system_prompt_chars={context_info.get('system_prompt_chars') or 0} "
            f"tools={context_info.get('tool_count') or 0} "
            f"fixed_tokens={context_info.get('fixed_context_tokens') if context_info.get('fixed_context_tokens') is not None else 'unknown'} "
            f"tokens={context_info.get('token_count') if context_info.get('token_count') is not None else 'unknown'}",
            file=sys.stderr,
            flush=True,
        )
        return {
            "session_id": session_id,
            "profile": profile or session.config.get("profile") or "default",
            "model": session.config.get("model"),
            "provider": session.config.get("provider"),
            **context_info,
        }

    def respond_compression(
        self,
        request_id: str,
        messages: list[dict[str, Any]] | None = None,
        system_message: str | None = None,
        error: str | None = None,
    ) -> dict[str, Any]:
        with self._lock:
            response_queue = self._compression_requests.get(request_id)
        if response_queue is None:
            raise RuntimeError(f"compression request {request_id} not found")
        response_queue.put({
            "messages": messages,
            "system_message": system_message,
            "error": error,
        })
        return {"request_id": request_id, "handled": True}

    def _destroy_session(self, session_id: str) -> None:
        session = self._sessions.pop(session_id, None)
        if session is None:
            return
        with self._lock:
            for rid in list(self._runs):
                if self._runs[rid].session_id == session_id:
                    del self._runs[rid]

    def _append_event(self, session_id: str, event: dict[str, Any]) -> None:
        with self._lock:
            session = self._sessions.get(session_id)
            run_id = session.current_run_id if session else None
            if run_id and run_id in self._runs:
                self._runs[run_id].events.append(_jsonable(event))

    def _status_callback(self, session_id: str):
        def callback(kind, text=None):
            self._append_event(session_id, {"event": "status", "kind": str(kind), "text": None if text is None else str(text)})

        return callback

    def _text_event_callback(self, session_id: str, event_name: str):
        def callback(text):
            self._append_event(session_id, {"event": event_name, "text": str(text)})

        return callback

    def _tool_start_callback(self, session_id: str):
        def callback(tool_call_id, function_name, function_args):
            self._append_event(session_id, {
                "event": "tool.started",
                "tool_call_id": str(tool_call_id) if tool_call_id else "",
                "tool_name": str(function_name) if function_name else "",
                "args": _jsonable(function_args) if function_args else {},
            })

        return callback

    def _tool_complete_callback(self, session_id: str):
        def callback(tool_call_id, function_name, function_args, function_result=None):
            result_text = "" if function_result is None else str(function_result)
            print(
                "[hermes_bridge] tool_complete_callback "
                f"session={session_id} tool={function_name} "
                f"tool_call_id={tool_call_id} result_none={function_result is None} "
                f"result_len={len(result_text)}",
                file=sys.stderr,
                flush=True,
            )
            self._append_event(session_id, {
                "event": "tool.completed",
                "tool_call_id": str(tool_call_id) if tool_call_id else "",
                "tool_name": str(function_name) if function_name else "",
                "args": _jsonable(function_args) if function_args else {},
                "result": _jsonable(function_result) if function_result is not None else None,
                "result_preview": str(function_result)[:500] if function_result else None,
            })

        return callback

    def _tool_progress_callback(self, session_id: str):
        def callback(event_type, function_name=None, preview=None, function_args=None, **kwargs):
            if event_type in (None, "tool.started", "tool.completed"):
                print(
                    "[hermes_bridge] tool_progress_callback "
                    f"session={session_id} event={event_type} tool={function_name} "
                    f"kwargs_keys={sorted(kwargs.keys())} "
                    f"preview_len={len(str(preview)) if preview is not None else 0}",
                    file=sys.stderr,
                    flush=True,
                )
            if event_type == "reasoning.available":
                self._append_event(session_id, {
                    "event": "reasoning.available",
                    "text": str(preview) if preview else "",
                })
                return

            if event_type == "_thinking":
                text = function_name
                if text:
                    self._append_event(session_id, {
                        "event": "reasoning.delta",
                        "text": str(text),
                    })
                return

            if event_type in (None, "tool.started"):
                # AIAgent also calls tool_start_callback with the real tool_call_id.
                # Use that event as canonical so resume/replay can match results.
                return

            if event_type == "tool.completed":
                # AIAgent sends the full function_result to tool_complete_callback.
                return

        return callback

    def _step_callback(self, session_id: str):
        def callback(step_info=None):
            self._append_event(session_id, {
                "event": "step",
                "step_info": _jsonable(step_info) if step_info else None,
            })

        return callback

    def _stream_delta_callback(self, session_id: str):
        def callback(delta=None):
            if delta is None:
                # Turn boundary signal (tools about to execute)
                self._append_event(session_id, {
                    "event": "turn.boundary",
                })
                return
            if delta:
                self._append_event(session_id, {
                    "event": "stream.delta",
                    "delta": str(delta),
                })

        return callback

    def _approval_callback(self, session_id: str):
        def callback(command: str, description: str, *, allow_permanent: bool = True) -> str:
            approval_id = uuid.uuid4().hex
            response_queue: queue.Queue[str] = queue.Queue(maxsize=1)
            with self._lock:
                self._approval_requests[approval_id] = response_queue
            choices = ["once", "session", "always", "deny"] if allow_permanent else ["once", "session", "deny"]
            self._append_event(session_id, {
                "event": "approval.requested",
                "approval_id": approval_id,
                "command": str(command or ""),
                "description": str(description or ""),
                "choices": choices,
                "allow_permanent": bool(allow_permanent),
                "timeout_ms": APPROVAL_TIMEOUT_MS,
            })
            try:
                choice = response_queue.get(timeout=APPROVAL_TIMEOUT_SECONDS)
            except queue.Empty:
                choice = "deny"
            finally:
                with self._lock:
                    self._approval_requests.pop(approval_id, None)
            self._append_event(session_id, {
                "event": "approval.resolved",
                "approval_id": approval_id,
                "choice": choice,
            })
            return choice

        return callback

    def _approval_dispatcher(self, command: str, description: str, *, allow_permanent: bool = True) -> str:
        session_id = str(getattr(self._run_context, "session_id", "") or "")
        if not session_id:
            return "deny"
        with self._lock:
            handler = self._approval_handlers.get(session_id)
        if handler is None:
            return "deny"
        return handler(command, description, allow_permanent=allow_permanent)

    def _install_approval_dispatcher_for_current_thread(self) -> None:
        from tools.terminal_tool import set_approval_callback

        # terminal_tool stores callbacks in threading.local(), so each run
        # thread must bind the shared dispatcher for itself.
        set_approval_callback(self._approval_dispatcher)

    def _enter_exec_ask_scope(self) -> None:
        with self._lock:
            if self._exec_ask_depth == 0:
                self._exec_ask_previous = os.environ.get("HERMES_EXEC_ASK")
                os.environ["HERMES_EXEC_ASK"] = "1"
            self._exec_ask_depth += 1

    def _exit_exec_ask_scope(self) -> None:
        with self._lock:
            if self._exec_ask_depth <= 0:
                return
            self._exec_ask_depth -= 1
            if self._exec_ask_depth > 0:
                return
            previous = self._exec_ask_previous
            self._exec_ask_previous = None
            if previous is None:
                os.environ.pop("HERMES_EXEC_ASK", None)
            else:
                os.environ["HERMES_EXEC_ASK"] = previous

    def _gateway_approval_notify(self, session_id: str):
        def callback(approval_data: dict[str, Any]) -> None:
            approval_id = uuid.uuid4().hex
            choices = ["once", "session", "always", "deny"]
            with self._lock:
                self._gateway_approval_requests[approval_id] = session_id
            self._append_event(session_id, {
                "event": "approval.requested",
                "approval_id": approval_id,
                "command": str(approval_data.get("command") or ""),
                "description": str(approval_data.get("description") or ""),
                "choices": choices,
                "allow_permanent": True,
                "timeout_ms": 300_000,
            })

        return callback

    def _prepersist_user_message(
        self,
        session: AgentSession,
        message: Any,
        storage_message: Any | None,
        conversation_history: list[dict[str, Any]] | None,
        profile: str | None,
        source: str | None = None,
    ) -> bool:
        persist_message = storage_message if storage_message is not None else message
        user_content = str(persist_message) if not isinstance(persist_message, dict) else str(persist_message.get("content", persist_message))
        if not user_content.strip():
            return False

        db = self._db.get_for_profile(profile)
        if db is None:
            return False

        history_len = len(conversation_history) if conversation_history else 0

        try:
            if hasattr(db, "create_session"):
                db.create_session(
                    session_id=session.session_id,
                    source=source or _bridge_platform(),
                    model=session.config.get("model"),
                )

            if hasattr(db, "get_messages"):
                messages = db.get_messages(session.session_id)
                if messages:
                    last = messages[-1]
                    if last.get("role") == "user" and last.get("content") == user_content:
                        self._align_prepersist_flush_cursor(session, history_len)
                        return False

            db.append_message(
                session_id=session.session_id,
                role="user",
                content=user_content,
            )

            # AIAgent will build messages as conversation_history + current user.
            # Since the current user was pre-persisted above, align the flush
            # cursor so the normal end-of-turn flush starts at assistant/tool
            # messages generated by this run.
            self._align_prepersist_flush_cursor(session, history_len)
            return True
        except Exception:
            return False

    def _align_prepersist_flush_cursor(self, session: AgentSession, history_len: int) -> None:
        try:
            session.agent._last_flushed_db_idx = history_len + 1
        except Exception:
            pass

    def _session_db_message_count(self, session_id: str, profile: str | None) -> int | None:
        db = self._db.get_for_profile(profile)
        if db is None or not hasattr(db, "get_messages"):
            return None
        try:
            return len(db.get_messages(session_id) or [])
        except Exception:
            return None

    def _sync_result_tail_to_session_db(
        self,
        session: AgentSession,
        result: dict[str, Any],
        conversation_history: list[dict[str, Any]] | None,
        profile: str | None,
        db_count_after_prepersist: int | None,
    ) -> None:
        db = self._db.get_for_profile(profile)
        if db is None or db_count_after_prepersist is None:
            return

        after_count = self._session_db_message_count(session.session_id, profile)
        if after_count is None or after_count > db_count_after_prepersist:
            return

        messages = result.get("messages")
        if not isinstance(messages, list):
            return

        history_len = len(conversation_history) if conversation_history else 0
        generated = [
            msg for msg in messages[history_len + 1:]
            if isinstance(msg, dict) and msg.get("role") in {"assistant", "tool"}
        ]
        if not generated:
            return

        appended = 0
        for msg in generated:
            try:
                db.append_message(
                    session_id=session.session_id,
                    role=str(msg.get("role") or "assistant"),
                    content=msg.get("content"),
                    tool_name=msg.get("tool_name"),
                    tool_calls=msg.get("tool_calls") if isinstance(msg.get("tool_calls"), list) else None,
                    tool_call_id=msg.get("tool_call_id"),
                    finish_reason=msg.get("finish_reason"),
                    reasoning=msg.get("reasoning") if msg.get("role") == "assistant" else None,
                    reasoning_content=msg.get("reasoning_content") if msg.get("role") == "assistant" else None,
                    reasoning_details=msg.get("reasoning_details") if msg.get("role") == "assistant" else None,
                    codex_reasoning_items=msg.get("codex_reasoning_items") if msg.get("role") == "assistant" else None,
                    codex_message_items=msg.get("codex_message_items") if msg.get("role") == "assistant" else None,
                )
                appended += 1
            except Exception:
                break

        if appended:
            print(
                "[hermes_bridge] synced missing result tail to session db "
                f"session={session.session_id} appended={appended}",
                file=sys.stderr,
                flush=True,
            )

    def start_chat(
        self,
        session_id: str,
        message: Any,
        storage_message: Any | None = None,
        instructions: str | None = None,
        conversation_history: list[dict[str, Any]] | None = None,
        profile: str | None = None,
        force_compress: bool = False,
        model: str | None = None,
        provider: str | None = None,
        source: str | None = None,
    ) -> RunRecord:
        session = self.get_or_create(session_id, profile=profile, model=model, provider=provider)
        with session.lock:
            if session.running:
                raise RuntimeError(f"session {session_id} is already running")
            run_id = uuid.uuid4().hex
            record = RunRecord(run_id=run_id, session_id=session_id)
            with self._lock:
                self._runs[run_id] = record
            session.running = True
            session.current_run_id = run_id
            session.last_used_at = time.time()
            context_event = self._bridge_context_ready_event(session, instructions, profile)
            if context_event:
                record.events.append(_jsonable(context_event))

        thread = threading.Thread(
            target=self._run_chat,
            args=(session, record, message, storage_message, instructions, conversation_history, profile, force_compress, source),
            daemon=True,
            name=f"hermes-bridge-run-{run_id[:8]}",
        )
        thread.start()
        return record

    def _run_chat(self, session: AgentSession, record: RunRecord, message: Any, storage_message: Any | None = None, instructions: str | None = None, conversation_history: list[dict[str, Any]] | None = None, profile: str | None = None, force_compress: bool = False, source: str | None = None) -> None:
        with _profile_env(profile):
            def stream_callback(delta: str) -> None:
                with self._lock:
                    record.deltas.append(str(delta))

            approval_session_token = None
            registered_gateway_approval_session = None
            exec_ask_scope_entered = False
            try:
                try:
                    self._enter_exec_ask_scope()
                    exec_ask_scope_entered = True
                    self._install_approval_dispatcher_for_current_thread()
                    with self._lock:
                        self._approval_handlers[session.session_id] = self._approval_callback(session.session_id)
                    self._run_context.session_id = session.session_id
                except Exception:
                    self._run_context.session_id = session.session_id
                try:
                    from tools.approval import register_gateway_notify, set_current_session_key

                    approval_session_token = set_current_session_key(session.session_id)
                    register_gateway_notify(session.session_id, self._gateway_approval_notify(session.session_id))
                    registered_gateway_approval_session = session.session_id
                except Exception:
                    pass
                self._prepersist_user_message(session, message, storage_message, conversation_history, profile, source)
                db_count_after_prepersist = self._session_db_message_count(session.session_id, profile)
                if force_compress:
                    compress = getattr(session.agent, "_compress_context", None)
                    if callable(compress):
                        compressed_history, compressed_system = compress(
                            conversation_history if isinstance(conversation_history, list) else [],
                            instructions,
                            approx_tokens=None,
                            focus_topic="debug_force_compress",
                        )
                        if isinstance(compressed_history, list):
                            conversation_history = compressed_history
                        if isinstance(compressed_system, str):
                            instructions = compressed_system
                kwargs: dict[str, Any] = dict(
                    task_id=session.session_id,
                    stream_callback=stream_callback,
                )
                if instructions:
                    kwargs["system_message"] = instructions
                if conversation_history is not None:
                    kwargs["conversation_history"] = conversation_history
                result = session.agent.run_conversation(
                    message,
                    **kwargs,
                )
                result = _jsonable(result if isinstance(result, dict) else {"value": result})
                self._sync_result_tail_to_session_db(
                    session,
                    result,
                    conversation_history,
                    profile,
                    db_count_after_prepersist,
                )
                with session.lock:
                    if isinstance(result.get("messages"), list):
                        session.history = result["messages"]
                    record.status = "interrupted" if result.get("interrupted") else "complete"
                    record.result = result
                    record.ended_at = time.time()
                    session.running = False
                    session.current_run_id = None
                    session.last_used_at = time.time()
            except Exception as exc:
                with session.lock:
                    record.status = "error"
                    record.error = str(exc)
                    record.result = {"error": str(exc), "traceback": traceback.format_exc()}
                    record.ended_at = time.time()
                    session.running = False
                    session.current_run_id = None
                    session.last_used_at = time.time()
            finally:
                with self._lock:
                    self._approval_handlers.pop(session.session_id, None)
                try:
                    del self._run_context.session_id
                except AttributeError:
                    pass
                if approval_session_token is not None:
                    try:
                        from tools.approval import reset_current_session_key, unregister_gateway_notify

                        if registered_gateway_approval_session is not None:
                            unregister_gateway_notify(registered_gateway_approval_session)
                        reset_current_session_key(approval_session_token)
                    except Exception:
                        pass
                if exec_ask_scope_entered:
                    self._exit_exec_ask_scope()

    def interrupt(self, session_id: str, message: str | None = None) -> dict[str, Any]:
        with self._lock:
            session = self._sessions.get(session_id)
        if session is None:
            raise KeyError(f"unknown session: {session_id}")
        if not hasattr(session.agent, "interrupt"):
            raise RuntimeError("agent does not support interrupt")
        session.agent.interrupt(message)
        deadline = time.time() + 10.0
        synced = False
        while time.time() < deadline:
            with session.lock:
                if not session.running:
                    synced = True
                    break
            time.sleep(0.05)
        return {"status": "interrupted", "session_id": session_id, "synced": synced}

    def steer(self, session_id: str, text: str) -> dict[str, Any]:
        with self._lock:
            session = self._sessions.get(session_id)
        if session is None:
            raise KeyError(f"unknown session: {session_id}")
        if not hasattr(session.agent, "steer"):
            raise RuntimeError("agent does not support steer")
        accepted = bool(session.agent.steer(text))
        return {"status": "queued" if accepted else "rejected", "accepted": accepted, "text": text}

    def respond_approval(self, approval_id: str, choice: str) -> dict[str, Any]:
        cleaned = str(choice or "deny").strip().lower()
        if cleaned not in {"once", "session", "always", "deny"}:
            cleaned = "deny"
        with self._lock:
            response_queue = self._approval_requests.get(approval_id)
        if response_queue is None:
            with self._lock:
                gateway_session_id = self._gateway_approval_requests.pop(approval_id, None)
            if gateway_session_id is None:
                return {"approval_id": approval_id, "resolved": False, "choice": cleaned}
            try:
                from tools.approval import resolve_gateway_approval

                resolved = resolve_gateway_approval(gateway_session_id, cleaned) > 0
            except Exception:
                resolved = False
            self._append_event(gateway_session_id, {
                "event": "approval.resolved",
                "approval_id": approval_id,
                "choice": cleaned,
            })
            return {"approval_id": approval_id, "resolved": resolved, "choice": cleaned}
        try:
            response_queue.put_nowait(cleaned)
        except queue.Full:
            pass
        return {"approval_id": approval_id, "resolved": True, "choice": cleaned}

    def get_history(self, session_id: str) -> dict[str, Any]:
        with self._lock:
            session = self._sessions.get(session_id)
        if session is None:
            raise KeyError(f"unknown session: {session_id}")
        with session.lock:
            return {"session_id": session_id, "history": copy.deepcopy(session.history)}

    def get_result(self, run_id: str) -> dict[str, Any]:
        with self._lock:
            record = self._runs.get(run_id)
        if record is None:
            raise KeyError(f"unknown run: {run_id}")
        return {
            "run_id": record.run_id,
            "session_id": record.session_id,
            "status": record.status,
            "started_at": record.started_at,
            "ended_at": record.ended_at,
            "output": "".join(record.deltas),
            "deltas": list(record.deltas),
            "events": list(record.events),
            "result": record.result,
            "error": record.error,
        }

    def get_output(self, run_id: str, cursor: int = 0, event_cursor: int = 0) -> dict[str, Any]:
        with self._lock:
            record = self._runs.get(run_id)
        if record is None:
            raise KeyError(f"unknown run: {run_id}")
        cursor = max(0, int(cursor or 0))
        deltas = list(record.deltas)
        next_cursor = len(deltas)
        event_cursor = max(0, int(event_cursor or 0))
        events = list(record.events)
        new_events = _jsonable(events[event_cursor:])
        next_event_cursor = len(events)
        return {
            "run_id": record.run_id,
            "session_id": record.session_id,
            "status": record.status,
            "delta": "".join(deltas[cursor:]),
            "cursor": next_cursor,
            "output": "".join(deltas),
            "done": record.status != "running",
            "result": record.result if record.status != "running" else None,
            "error": record.error,
            "events": new_events,
            "event_cursor": next_event_cursor,
        }

    def destroy(self, session_id: str) -> dict[str, Any]:
        with self._lock:
            session = self._sessions.pop(session_id, None)
        if session is None:
            return {"session_id": session_id, "destroyed": False}
        if session.running and hasattr(session.agent, "interrupt"):
            try:
                session.agent.interrupt("Session destroyed")
            except Exception:
                pass
        return {"session_id": session_id, "destroyed": True}

    def destroy_all(self) -> dict[str, Any]:
        with self._lock:
            ids = list(self._sessions.keys())
        destroyed = []
        for sid in ids:
            result = self.destroy(sid)
            destroyed.append(result)
        return {"destroyed": len(destroyed)}

    def status(self, session_id: str) -> dict[str, Any]:
        with self._lock:
            session = self._sessions.get(session_id)
        if session is None:
            return {
                "session_id": session_id,
                "exists": False,
                "running": False,
                "message_count": 0,
            }
        with session.lock:
            return {
                "session_id": session_id,
                "exists": True,
                "running": session.running,
                "current_run_id": session.current_run_id,
                "created_at": session.created_at,
                "last_used_at": session.last_used_at,
                "message_count": len(session.history),
                "config": session.config,
            }

    def list_sessions(self) -> dict[str, Any]:
        with self._lock:
            sessions = list(self._sessions.values())
        return {
            "sessions": [
                {
                    "session_id": s.session_id,
                    "running": s.running,
                    "current_run_id": s.current_run_id,
                    "created_at": s.created_at,
                    "last_used_at": s.last_used_at,
                    "message_count": len(s.history),
                    "config": s.config,
                }
                for s in sessions
            ]
        }


class BridgeServer:
    IDLE_TIMEOUT_SECONDS = 30 * 60  # 30 minutes
    GC_INTERVAL_SECONDS = 60  # check every minute

    def __init__(self, endpoint: str) -> None:
        self.endpoint = endpoint
        self.pool = AgentPool()
        self._stop = threading.Event()
        self._last_gc = time.time()

    def handle(self, req: dict[str, Any]) -> dict[str, Any]:
        action = str(req.get("action") or "").strip()
        if not action:
            raise ValueError("action is required")

        if action == "ping":
            with self.pool._lock:
                sessions = list(self.pool._sessions.values())
            running_sessions = sum(1 for session in sessions if session.running)
            return {
                "pong": True,
                "time": time.time(),
                "pid": os.getpid(),
                "agent_root": str(_agent_root()),
                "profile": _worker_profile() or "default",
                "hermes_home": str(_hermes_home()),
                "session_count": len(sessions),
                "running_session_count": running_sessions,
            }

        if action == "chat":
            session_id = str(req.get("session_id") or "").strip() or uuid.uuid4().hex
            message = req.get("message", req.get("input", ""))
            storage_message = req.get("storage_message")
            instructions = req.get("instructions") or req.get("system_message")
            conversation_history = req.get("conversation_history")
            profile = req.get("profile")
            model = req.get("model")
            provider = req.get("provider")
            source = req.get("source")
            record = self.pool.start_chat(
                session_id,
                message,
                storage_message,
                instructions,
                conversation_history,
                profile,
                bool(req.get("force_compress")),
                model,
                provider,
                source,
            )
            if req.get("wait"):
                timeout = float(req.get("timeout", 0) or 0)
                deadline = time.time() + timeout if timeout > 0 else None
                while record.status == "running":
                    if deadline is not None and time.time() >= deadline:
                        break
                    time.sleep(0.05)
                return self.pool.get_result(record.run_id)
            return {"run_id": record.run_id, "session_id": session_id, "status": record.status}

        if action == "context_estimate":
            session_id = str(req.get("session_id") or "").strip() or uuid.uuid4().hex
            messages = req.get("messages") or req.get("conversation_history") or []
            if not isinstance(messages, list):
                raise ValueError("messages must be a list")
            return self.pool.estimate_context(
                session_id,
                messages=messages,
                instructions=req.get("instructions") or req.get("system_message"),
                profile=req.get("profile"),
                model=req.get("model"),
                provider=req.get("provider"),
            )

        if action == "get_result":
            return self.pool.get_result(str(req.get("run_id") or ""))

        if action == "get_output":
            return self.pool.get_output(
                str(req.get("run_id") or ""),
                int(req.get("cursor") or 0),
                int(req.get("event_cursor") or 0),
            )

        if action == "interrupt":
            return self.pool.interrupt(str(req.get("session_id") or ""), req.get("message"))

        if action == "steer":
            text = str(req.get("text") or req.get("message") or "").strip()
            if not text:
                raise ValueError("text is required")
            return self.pool.steer(str(req.get("session_id") or ""), text)

        if action == "approval_respond":
            approval_id = str(req.get("approval_id") or "").strip()
            if not approval_id:
                raise ValueError("approval_id is required")
            return self.pool.respond_approval(approval_id, str(req.get("choice") or "deny"))

        if action == "compression_respond":
            request_id = str(req.get("request_id") or "").strip()
            if not request_id:
                raise ValueError("request_id is required")
            messages = req.get("messages")
            if messages is not None and not isinstance(messages, list):
                raise ValueError("messages must be a list")
            return self.pool.respond_compression(
                request_id,
                messages=messages,
                system_message=req.get("system_message"),
                error=req.get("error"),
            )

        if action == "get_history":
            return self.pool.get_history(str(req.get("session_id") or ""))

        if action == "destroy":
            return self.pool.destroy(str(req.get("session_id") or ""))

        if action == "destroy_all":
            return self.pool.destroy_all()

        if action == "list":
            return self.pool.list_sessions()

        if action == "shutdown":
            self._stop.set()
            return {"status": "shutting_down"}

        raise ValueError(f"unknown action: {action}")

    def _make_server_socket(self) -> socket.socket:
        return _make_listen_socket(self.endpoint)

    def _read_request(self, conn: socket.socket) -> dict[str, Any]:
        return _read_json_request(conn)

    def _write_response(self, conn: socket.socket, resp: dict[str, Any]) -> None:
        _write_json_response(conn, resp)

    def _gc_idle_sessions(self) -> None:
        """Destroy sessions idle longer than IDLE_TIMEOUT_SECONDS."""
        now = time.time()
        if now - self._last_gc < self.GC_INTERVAL_SECONDS:
            return
        self._last_gc = now
        with self.pool._lock:
            idle_ids = [
                sid for sid, s in self.pool._sessions.items()
                if not s.running and now - s.last_used_at > self.IDLE_TIMEOUT_SECONDS
            ]
        for sid in idle_ids:
            self.pool.destroy(sid)

    def serve_forever(self) -> None:
        server = self._make_server_socket()
        restore_signals = _install_stop_signal_handlers(self._stop)
        _start_parent_process_watchdog(
            _positive_int(os.environ.get("HERMES_AGENT_BRIDGE_BROKER_PID")),
            self._stop,
            f"worker:{_worker_profile() or 'default'}",
        )
        try:
            server.listen(16)
            server.settimeout(0.2)
            print(json.dumps({"event": "ready", "endpoint": self.endpoint}), flush=True)

            while not self._stop.is_set():
                conn: socket.socket | None = None
                try:
                    try:
                        conn, _addr = server.accept()
                    except socket.timeout:
                        self._gc_idle_sessions()
                        continue
                    try:
                        req = self._read_request(conn)
                        data = self.handle(req)
                        resp = {"ok": True, **_jsonable(data)}
                    except Exception as exc:
                        resp = {
                            "ok": False,
                            "error": str(exc),
                            "error_type": exc.__class__.__name__,
                        }
                    self._write_response(conn, resp)
                except KeyboardInterrupt:
                    break
                except Exception as exc:
                    print(f"[hermes-bridge] server loop error: {exc}", file=sys.stderr, flush=True)
                finally:
                    if conn is not None:
                        try:
                            conn.close()
                        except OSError:
                            pass
        finally:
            restore_signals()
            server.close()
            if self.endpoint.startswith("ipc://"):
                try:
                    Path(self.endpoint.removeprefix("ipc://")).unlink(missing_ok=True)
                except OSError:
                    pass


class WorkerProcess:
    STARTUP_TIMEOUT_SECONDS = 120
    REQUEST_TIMEOUT_SECONDS = 120

    def __init__(self, profile: str, endpoint: str, agent_root: str | None, hermes_home: str | None) -> None:
        self.profile = profile or "default"
        self.endpoint = endpoint
        self.agent_root = agent_root
        self.hermes_home = hermes_home
        self.process: subprocess.Popen[str] | None = None
        self.last_used_at = time.time()
        self._lock = threading.RLock()

    @property
    def running(self) -> bool:
        return self.process is not None and self.process.poll() is None

    @property
    def pid(self) -> int | None:
        return self.process.pid if self.process is not None else None

    def start(self) -> None:
        with self._lock:
            if self.running:
                return
            args = [
                sys.executable,
                str(Path(__file__).resolve()),
                "--endpoint",
                self.endpoint,
                "--worker-profile",
                self.profile,
            ]
            if self.agent_root:
                args.extend(["--agent-root", self.agent_root])
            if self.hermes_home:
                args.extend(["--hermes-home", self.hermes_home])

            env = {
                **os.environ,
                "HERMES_AGENT_BRIDGE_ENDPOINT": self.endpoint,
                "HERMES_AGENT_BRIDGE_WORKER_PROFILE": self.profile,
                "HERMES_AGENT_BRIDGE_BROKER_PID": str(os.getpid()),
            }
            self.process = subprocess.Popen(
                args,
                env=env,
                cwd=os.getcwd(),
                stdin=subprocess.DEVNULL,
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                text=True,
                bufsize=1,
            )
            self._pipe_stderr()
            self._wait_ready()

    def _pipe_stderr(self) -> None:
        proc = self.process
        if proc is None or proc.stderr is None:
            return

        def run() -> None:
            assert proc.stderr is not None
            for line in proc.stderr:
                text = line.rstrip()
                if text:
                    print(f"[hermes-bridge-worker:{self.profile}] {text}", file=sys.stderr, flush=True)

        threading.Thread(target=run, daemon=True, name=f"hermes-bridge-worker-stderr-{self.profile}").start()

    def _wait_ready(self) -> None:
        proc = self.process
        if proc is None or proc.stdout is None:
            raise RuntimeError(f"profile worker {self.profile} did not start")
        lines: queue.Queue[str | None] = queue.Queue()
        ready_event = threading.Event()

        def read_stdout() -> None:
            assert proc.stdout is not None
            try:
                for line in proc.stdout:
                    if ready_event.is_set():
                        text = line.rstrip()
                        if text:
                            print(f"[hermes-bridge-worker:{self.profile}] {text}", file=sys.stderr, flush=True)
                    else:
                        lines.put(line)
            finally:
                lines.put(None)

        threading.Thread(target=read_stdout, daemon=True, name=f"hermes-bridge-worker-stdout-{self.profile}").start()
        deadline = time.time() + self.STARTUP_TIMEOUT_SECONDS
        while time.time() < deadline:
            if proc.poll() is not None:
                raise RuntimeError(f"profile worker {self.profile} exited before ready")
            try:
                line = lines.get(timeout=0.1)
            except queue.Empty:
                continue
            if line is None:
                time.sleep(0.05)
                continue
            text = line.strip()
            if text:
                print(f"[hermes-bridge-worker:{self.profile}] {text}", file=sys.stderr, flush=True)
            try:
                data = json.loads(text)
                if data.get("event") == "ready":
                    ready_event.set()
                    return
            except Exception:
                pass
        self.stop()
        raise RuntimeError(f"profile worker {self.profile} did not become ready within {self.STARTUP_TIMEOUT_SECONDS}s")

    def stop(self) -> None:
        with self._lock:
            proc = self.process
            self.process = None
        if proc is None:
            return
        if proc.poll() is None:
            proc.terminate()
            try:
                proc.wait(timeout=3)
            except subprocess.TimeoutExpired:
                proc.kill()
                proc.wait(timeout=3)
        if self.endpoint.startswith("ipc://"):
            try:
                Path(self.endpoint.removeprefix("ipc://")).unlink(missing_ok=True)
            except OSError:
                pass

    def request(self, req: dict[str, Any]) -> dict[str, Any]:
        self.start()
        self.last_used_at = time.time()
        return _send_bridge_request(self.endpoint, req, self.REQUEST_TIMEOUT_SECONDS)


def _worker_endpoint(profile: str) -> str:
    safe = hashlib.sha256(profile.encode("utf-8")).hexdigest()[:16]
    if os.name == "nt":
        port_base = int(os.environ.get("HERMES_AGENT_BRIDGE_WORKER_PORT_BASE", "18780"))
        return f"tcp://127.0.0.1:{port_base + int(safe[:4], 16) % 1000}"
    root = Path(tempfile.gettempdir()) / "hermes-agent-bridge-workers"
    return f"ipc://{root / f'{safe}.sock'}"


def _connect_bridge_socket(endpoint: str, timeout: float) -> socket.socket:
    if endpoint.startswith("ipc://"):
        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        sock.settimeout(timeout)
        sock.connect(endpoint.removeprefix("ipc://"))
        return sock
    parsed = urlparse(endpoint)
    if parsed.scheme != "tcp":
        raise RuntimeError(f"unsupported endpoint scheme: {endpoint}")
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.settimeout(timeout)
    sock.connect((parsed.hostname or "127.0.0.1", int(parsed.port or 0)))
    return sock


def _send_bridge_request(endpoint: str, req: dict[str, Any], timeout: float) -> dict[str, Any]:
    sock = _connect_bridge_socket(endpoint, timeout)
    try:
        sock.sendall((json.dumps(req, ensure_ascii=False, default=str) + "\n").encode("utf-8"))
        chunks: list[bytes] = []
        while True:
            chunk = sock.recv(65536)
            if not chunk:
                break
            chunks.append(chunk)
            if b"\n" in chunk:
                break
        line = b"".join(chunks).split(b"\n", 1)[0].strip()
        if not line:
            raise RuntimeError("worker closed without a response")
        resp = json.loads(line.decode("utf-8"))
        if not resp.get("ok"):
            raise RuntimeError(str(resp.get("error") or "worker request failed"))
        return resp
    finally:
        try:
            sock.close()
        except OSError:
            pass


def _tcp_endpoint_port(endpoint: str) -> int | None:
    parsed = urlparse(endpoint)
    if parsed.scheme != "tcp":
        return None
    try:
        port = int(parsed.port or 0)
        return port if port > 0 else None
    except (TypeError, ValueError):
        return None


def _platform_text_encoding() -> str:
    getencoding = getattr(locale, "getencoding", None)
    if callable(getencoding):
        return getencoding() or "utf-8"
    return locale.getpreferredencoding(False) or "utf-8"


def _windows_listening_pids_on_port(port: int) -> list[int]:
    if os.name != "nt":
        return []
    try:
        result = subprocess.run(
            ["netstat.exe", "-ano", "-p", "tcp"],
            check=False,
            capture_output=True,
            text=True,
            encoding=_platform_text_encoding(),
            errors="ignore",
            timeout=5,
        )
    except Exception:
        return []
    stdout = result.stdout or ""
    pids: set[int] = set()
    for line in stdout.splitlines():
        parts = line.strip().split()
        if len(parts) < 5:
            continue
        proto, local_address, _remote_address, state, pid_raw = parts[:5]
        if proto.upper() != "TCP" or state.upper() != "LISTENING":
            continue
        if not local_address.endswith(f":{port}"):
            continue
        try:
            pid = int(pid_raw)
        except ValueError:
            continue
        if pid > 0 and pid != os.getpid():
            pids.add(pid)
    return sorted(pids)


def _kill_windows_endpoint_occupants(endpoint: str) -> None:
    if os.name != "nt":
        return
    port = _tcp_endpoint_port(endpoint)
    if not port:
        return
    for pid in _windows_listening_pids_on_port(port):
        try:
            print(
                f"[hermes-bridge] killing stale process tree pid={pid} port={port}",
                file=sys.stderr,
                flush=True,
            )
            subprocess.run(
                ["taskkill.exe", "/PID", str(pid), "/T", "/F"],
                check=False,
                capture_output=True,
                text=True,
                timeout=10,
            )
        except Exception as exc:
            print(
                f"[hermes-bridge] failed to kill stale process pid={pid}: {exc}",
                file=sys.stderr,
                flush=True,
            )
    deadline = time.time() + 3
    while time.time() < deadline:
        if not _windows_listening_pids_on_port(port):
            return
        time.sleep(0.1)


def _make_listen_socket(endpoint: str) -> socket.socket:
    _kill_windows_endpoint_occupants(endpoint)
    if endpoint.startswith("ipc://"):
        if not hasattr(socket, "AF_UNIX"):
            raise RuntimeError("ipc:// endpoints require Unix domain socket support; use tcp://host:port on this platform")
        sock_path = Path(endpoint.removeprefix("ipc://"))
        sock_path.parent.mkdir(parents=True, exist_ok=True)
        try:
            sock_path.unlink(missing_ok=True)
        except OSError:
            pass
        server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        server.bind(str(sock_path))
        return server

    parsed = urlparse(endpoint)
    if parsed.scheme != "tcp":
        raise RuntimeError(f"unsupported endpoint scheme: {endpoint}")
    host = parsed.hostname or "127.0.0.1"
    port = int(parsed.port or 0)
    if port <= 0:
        raise RuntimeError(f"tcp endpoint requires a port: {endpoint}")
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    server.bind((host, port))
    return server


def _read_json_request(conn: socket.socket) -> dict[str, Any]:
    chunks: list[bytes] = []
    while True:
        chunk = conn.recv(65536)
        if not chunk:
            break
        chunks.append(chunk)
        if b"\n" in chunk:
            break
    if not chunks:
        raise RuntimeError("empty request")
    line = b"".join(chunks).split(b"\n", 1)[0].strip()
    if not line:
        raise RuntimeError("empty request")
    return json.loads(line.decode("utf-8"))


def _write_json_response(conn: socket.socket, resp: dict[str, Any]) -> None:
    payload = json.dumps(resp, ensure_ascii=False, default=str) + "\n"
    conn.sendall(payload.encode("utf-8"))


class BridgeBroker:
    IDLE_TIMEOUT_SECONDS = 30 * 60
    GC_INTERVAL_SECONDS = 60

    def __init__(self, endpoint: str, agent_root: str | None = None, hermes_home: str | None = None) -> None:
        self.endpoint = endpoint
        self.agent_root = agent_root
        self.hermes_home = hermes_home
        self._workers: dict[str, WorkerProcess] = {}
        self._run_profile: dict[str, str] = {}
        self._running_run_profile: dict[str, str] = {}
        self._session_profile: dict[str, str] = {}
        self._approval_profile: dict[str, str] = {}
        self._compression_profile: dict[str, str] = {}
        self._lock = threading.RLock()
        self._stop = threading.Event()
        self._last_gc = time.time()

    def _normalize_profile(self, value: Any) -> str:
        profile = str(value or "").strip()
        return profile or "default"

    def _worker_for_profile(self, profile: str) -> WorkerProcess:
        profile = self._normalize_profile(profile)
        with self._lock:
            worker = self._workers.get(profile)
            if worker is None:
                worker = WorkerProcess(profile, _worker_endpoint(profile), self.agent_root, self.hermes_home)
                self._workers[profile] = worker
        return worker

    def _profile_for_run(self, run_id: str) -> str:
        with self._lock:
            profile = self._run_profile.get(run_id)
        if not profile:
            raise KeyError(f"unknown run: {run_id}")
        return profile

    def _profile_for_session(self, session_id: str, fallback_profile: Any = None) -> str:
        with self._lock:
            profile = self._session_profile.get(session_id)
        if not profile:
            fallback = self._normalize_profile(fallback_profile)
            if fallback_profile is not None and fallback:
                return fallback
            raise KeyError(f"unknown session: {session_id}")
        return profile

    def _record_response_routes(self, profile: str, resp: dict[str, Any]) -> None:
        run_id = str(resp.get("run_id") or "")
        session_id = str(resp.get("session_id") or "")
        with self._lock:
            if run_id:
                self._run_profile[run_id] = profile
                if resp.get("status") == "running":
                    self._running_run_profile[run_id] = profile
                else:
                    self._running_run_profile.pop(run_id, None)
            if session_id:
                self._session_profile[session_id] = profile
            for event in resp.get("events") or []:
                if not isinstance(event, dict):
                    continue
                approval_id = str(event.get("approval_id") or "")
                if approval_id:
                    self._approval_profile[approval_id] = profile
                request_id = str(event.get("request_id") or "")
                if event.get("event") == "bridge.compression.requested" and request_id:
                    self._compression_profile[request_id] = profile
                if event.get("event") in {"bridge.compression.completed", "bridge.compression.failed"} and request_id:
                    self._compression_profile.pop(request_id, None)

    def stop(self) -> None:
        self._stop.set()
        with self._lock:
            workers = list(self._workers.values())
            self._workers.clear()
            self._run_profile.clear()
            self._running_run_profile.clear()
            self._session_profile.clear()
            self._approval_profile.clear()
            self._compression_profile.clear()
        for worker in workers:
            worker.stop()

    def _forward(self, profile: str, req: dict[str, Any]) -> dict[str, Any]:
        worker = self._worker_for_profile(profile)
        forwarded = dict(req)
        forwarded["profile"] = profile
        resp = worker.request(forwarded)
        self._record_response_routes(profile, resp)
        return resp

    def handle(self, req: dict[str, Any]) -> dict[str, Any]:
        action = str(req.get("action") or "").strip()
        if not action:
            raise ValueError("action is required")

        if action == "ping":
            with self._lock:
                worker_details = {
                    profile: {
                        "running": worker.running,
                        "pid": worker.pid,
                        "endpoint": worker.endpoint,
                        "last_used_at": worker.last_used_at,
                    }
                    for profile, worker in self._workers.items()
                }
                workers = {profile: details["running"] for profile, details in worker_details.items()}
                sessions_by_profile: dict[str, int] = {}
                for profile in self._session_profile.values():
                    sessions_by_profile[profile] = sessions_by_profile.get(profile, 0) + 1
                running_sessions_by_profile: dict[str, int] = {}
                for profile in self._running_run_profile.values():
                    running_sessions_by_profile[profile] = running_sessions_by_profile.get(profile, 0) + 1
                active_sessions = len(self._session_profile)
                running_sessions = len(self._running_run_profile)
            return {
                "pong": True,
                "time": time.time(),
                "mode": "broker",
                "broker": {
                    "pid": os.getpid(),
                    "endpoint": self.endpoint,
                },
                "workers": workers,
                "worker_details": worker_details,
                "active_sessions": active_sessions,
                "running_sessions": running_sessions,
                "sessions_by_profile": sessions_by_profile,
                "running_sessions_by_profile": running_sessions_by_profile,
            }

        if action == "worker_ping":
            profile = self._normalize_profile(req.get("profile"))
            resp = self._forward(profile, {"action": "ping"})
            resp["worker_profile"] = profile
            return resp

        if action == "chat":
            profile = self._normalize_profile(req.get("profile"))
            return self._forward(profile, req)

        if action == "context_estimate":
            profile = self._normalize_profile(req.get("profile"))
            return self._forward(profile, req)

        if action in {"get_result", "get_output"}:
            profile = self._profile_for_run(str(req.get("run_id") or ""))
            return self._forward(profile, req)

        if action in {"interrupt", "steer", "get_history", "destroy"}:
            session_id = str(req.get("session_id") or "")
            profile = self._profile_for_session(session_id, req.get("profile"))
            resp = self._forward(profile, req)
            if action == "destroy":
                with self._lock:
                    self._session_profile.pop(session_id, None)
            return resp

        if action == "approval_respond":
            approval_id = str(req.get("approval_id") or "").strip()
            if not approval_id:
                raise ValueError("approval_id is required")
            with self._lock:
                profile = self._approval_profile.get(approval_id)
            if not profile:
                raise KeyError(f"unknown approval request: {approval_id}")
            return self._forward(profile, req)

        if action == "compression_respond":
            request_id = str(req.get("request_id") or "").strip()
            if not request_id:
                raise ValueError("request_id is required")
            with self._lock:
                profile = self._compression_profile.get(request_id)
            if not profile:
                raise KeyError(f"unknown compression request: {request_id}")
            return self._forward(profile, req)

        if action == "destroy_all":
            with self._lock:
                workers = list(self._workers.values())
                self._workers.clear()
                self._run_profile.clear()
                self._running_run_profile.clear()
                self._session_profile.clear()
                self._approval_profile.clear()
                self._compression_profile.clear()
            destroyed = 0
            for worker in workers:
                try:
                    if worker.running:
                        resp = worker.request({"action": "destroy_all"})
                        destroyed += int(resp.get("destroyed") or 0)
                except Exception:
                    pass
                finally:
                    worker.stop()
            return {"destroyed": destroyed}

        if action == "destroy_profile":
            profile = self._normalize_profile(req.get("profile"))
            with self._lock:
                worker = self._workers.pop(profile, None)
                self._run_profile = {key: value for key, value in self._run_profile.items() if value != profile}
                self._running_run_profile = {key: value for key, value in self._running_run_profile.items() if value != profile}
                self._session_profile = {key: value for key, value in self._session_profile.items() if value != profile}
                self._approval_profile = {key: value for key, value in self._approval_profile.items() if value != profile}
                self._compression_profile = {key: value for key, value in self._compression_profile.items() if value != profile}

            if worker is None or not worker.running:
                if worker is not None:
                    worker.stop()
                return {"profile": profile, "destroyed": 0}

            try:
                resp = worker.request({"action": "destroy_all"})
                destroyed = int(resp.get("destroyed") or 0)
            except Exception:
                destroyed = 0
            finally:
                worker.stop()
            return {"profile": profile, "destroyed": destroyed}

        if action == "list":
            sessions: list[Any] = []
            with self._lock:
                workers = list(self._workers.items())
            for profile, worker in workers:
                if not worker.running:
                    continue
                try:
                    resp = worker.request({"action": "list"})
                    for session in resp.get("sessions") or []:
                        if isinstance(session, dict):
                            session.setdefault("profile", profile)
                        sessions.append(session)
                except Exception:
                    pass
            return {"sessions": sessions}

        if action == "shutdown":
            self.stop()
            return {"status": "shutting_down"}

        raise ValueError(f"unknown action: {action}")

    def _make_server_socket(self) -> socket.socket:
        return _make_listen_socket(self.endpoint)

    def _read_request(self, conn: socket.socket) -> dict[str, Any]:
        return _read_json_request(conn)

    def _write_response(self, conn: socket.socket, resp: dict[str, Any]) -> None:
        _write_json_response(conn, resp)

    def _handle_connection(self, conn: socket.socket) -> None:
        try:
            try:
                req = self._read_request(conn)
                data = self.handle(req)
                resp = {"ok": True, **_jsonable(data)}
            except Exception as exc:
                resp = {
                    "ok": False,
                    "error": str(exc),
                    "error_type": exc.__class__.__name__,
                }
            self._write_response(conn, resp)
        except Exception as exc:
            print(f"[hermes-bridge-broker] connection error: {exc}", file=sys.stderr, flush=True)
        finally:
            try:
                conn.close()
            except OSError:
                pass

    def _gc_idle_workers(self) -> None:
        now = time.time()
        if now - self._last_gc < self.GC_INTERVAL_SECONDS:
            return
        self._last_gc = now
        with self._lock:
            idle = [
                profile for profile, worker in self._workers.items()
                if worker.running and now - worker.last_used_at > self.IDLE_TIMEOUT_SECONDS
            ]
        for profile in idle:
            with self._lock:
                worker = self._workers.pop(profile, None)
            if worker:
                worker.stop()

    def serve_forever(self) -> None:
        server = self._make_server_socket()
        restore_signals = _install_stop_signal_handlers(self._stop)
        atexit.register(self.stop)
        try:
            server.listen(64)
            server.settimeout(0.2)
            print(json.dumps({"event": "ready", "endpoint": self.endpoint, "mode": "broker"}), flush=True)

            while not self._stop.is_set():
                try:
                    try:
                        conn, _addr = server.accept()
                    except socket.timeout:
                        self._gc_idle_workers()
                        continue
                    threading.Thread(
                        target=self._handle_connection,
                        args=(conn,),
                        daemon=True,
                        name="hermes-bridge-broker-connection",
                    ).start()
                except KeyboardInterrupt:
                    break
                except Exception as exc:
                    print(f"[hermes-bridge-broker] server loop error: {exc}", file=sys.stderr, flush=True)
        finally:
            restore_signals()
            try:
                atexit.unregister(self.stop)
            except Exception:
                pass
            self.stop()
            server.close()
            if self.endpoint.startswith("ipc://"):
                try:
                    Path(self.endpoint.removeprefix("ipc://")).unlink(missing_ok=True)
                except OSError:
                    pass


def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(description="Hermes AIAgent in-process bridge")
    parser.add_argument("--endpoint", default=os.environ.get("HERMES_AGENT_BRIDGE_ENDPOINT", DEFAULT_ENDPOINT))
    parser.add_argument("--agent-root", default=os.environ.get("HERMES_AGENT_ROOT", DEFAULT_AGENT_ROOT))
    parser.add_argument("--hermes-home", default=os.environ.get("HERMES_HOME", DEFAULT_HERMES_HOME))
    parser.add_argument("--worker-profile", default=os.environ.get("HERMES_AGENT_BRIDGE_WORKER_PROFILE"))
    args = parser.parse_args(argv)

    _set_path_env(args.agent_root, args.hermes_home)
    _ensure_agent_imports()
    if args.worker_profile:
        _set_worker_profile_env(str(args.worker_profile or "default"))
        BridgeServer(args.endpoint).serve_forever()
    else:
        BridgeBroker(args.endpoint, args.agent_root, args.hermes_home).serve_forever()
    return 0


if __name__ == "__main__":
    raise SystemExit(main())