.agents/skills/lib_py/agents/adapters/agy.py

@@ -197,11 +197,14 @@ class AgyAgentAdapter(BaseAgentAdapter):
         # the DB already gone, and those orphans must still be reachable.
         return any(os.path.exists(p) for p in self._artifact_paths(uuid, ctx))
 
+    def in_use_paths(self, uuid: str, ctx: DiscoveryContext) -> list:
+        return self._artifact_paths(uuid, ctx)
+
     def conversation_in_use(self, uuid: str, ctx: DiscoveryContext) -> bool:
         # The holder may keep the presence lock (or a sidecar) open rather
         # than the DB, and may name the uuid nowhere; the lsof leg of the
         # check must see every path of the conversation.
-        return conversation_in_use(uuid, self._artifact_paths(uuid, ctx))
+        return conversation_in_use(uuid, self.in_use_paths(uuid, ctx))
 
     def purge_artifacts(self, uuid: str, ctx: DiscoveryContext) -> list:
         # Issue #10: a purge must leave nothing resumable behind. Besides the

.agents/skills/lib_py/agents/adapters/opencode.py

@@ -13,6 +13,11 @@ _LEGACY_TABLES = (("message", "session_id"), ("messages", "session_id"), ("part"
 # (binary, HOME, XDG_DATA_HOME) -> the db `debug paths` printed for them.
 _DB_PATHS = {}
 
+
+def _is_shared_service(cmd: str) -> bool:
+    """The per-user opencode background service (`serve --service`)."""
+    return "serve --service" in (cmd or "")
+
 class OpenCodeAgentAdapter(BaseAgentAdapter):
     @property
     def name(self) -> str:
@@ -250,6 +255,13 @@ class OpenCodeAgentAdapter(BaseAgentAdapter):
             found += rows if i == uuid else [f"{r} [child session {i}]" for r in rows]
         return found
 
+    def in_use_paths(self, uuid: str, ctx: DiscoveryContext) -> list:
+        db = self._resolve_db(ctx)
+        return [db] if db else []
+
+    def _holder_counts(self, cmd: str) -> bool:
+        return not _is_shared_service(cmd)
+
     def conversation_in_use(self, uuid: str, ctx: DiscoveryContext) -> bool:
         """A process naming the session, or an opencode process holding the
         shared database. The per-user background service (`serve --service`)
@@ -270,13 +282,14 @@ class OpenCodeAgentAdapter(BaseAgentAdapter):
                                      timeout=10).stdout
             except Exception:
                 return True
-            if cmd.strip() and "serve --service" not in cmd:
+            if cmd.strip() and not _is_shared_service(cmd):
                 return True
         return False
 
     def in_use_hints(self, uuid: str, ctx: DiscoveryContext) -> list:
+        db = self._resolve_db(ctx)
         return super().in_use_hints(uuid, ctx) + [
-            f"another opencode session holding {self._resolve_db(ctx)}: lsof {self._resolve_db(ctx)}"]
+            f"another opencode session holding {db}: lsof {db}"]
 
     # opencode 2.x: the default agent is build (`--agent` is gone from the
     # TUI), and --standalone keeps the server a child of the pane's TUI

.agents/skills/lib_py/agents/base.py

@@ -1,7 +1,7 @@
 # base.py — BaseAgentAdapter abstract base class, SpawnSpec, and DiscoveryContext
 
 import os, json, sqlite3, shutil, subprocess, tempfile
-from typing import Optional, Dict, Any, List
+from typing import Optional, Dict, Any, List, Tuple
 from urllib.parse import quote
 from lib_py.paths import resolve_home
 from lib_py.verify_session import verify_session_uuid, workspace_key
@@ -86,6 +86,34 @@ def conversation_in_use(uuid: str, paths=()) -> bool:
     return False
 
 
+def file_holders(paths=()) -> List[Tuple[int, str]]:
+    """(pid, command_line) for each process holding one of `paths` open via lsof (#78).
+    Informational only: returns [] when lsof is absent or fails."""
+    existing = [p for p in paths if p and os.path.exists(p)]
+    if not existing or not shutil.which("lsof"):
+        return []
+    try:
+        r = subprocess.run(["lsof", "-t"] + existing, capture_output=True, text=True, timeout=10)
+    except Exception:
+        return []
+    pids: List[int] = []
+    for tok in (r.stdout or "").split():
+        if tok.isdigit():
+            pid = int(tok)
+            if pid not in pids:
+                pids.append(pid)
+    out: List[Tuple[int, str]] = []
+    for pid in pids:
+        try:
+            cmd = subprocess.run(["ps", "-o", "command=", "-p", str(pid)],
+                                 capture_output=True, text=True, timeout=10).stdout.strip()
+        except Exception:
+            continue
+        if cmd:
+            out.append((pid, cmd))
+    return out
+
+
 def _plausible_id(uuid: str) -> bool:
     """An id safe to build a path from and to search for: not empty, not
     made of dots alone ("." names the parent dir itself), no "/", ".." or "*"."""
@@ -354,14 +382,25 @@ class BaseAgentAdapter:
         path = self.artifact_path(uuid, ctx)
         return uuid in path and os.path.exists(path)
 
+    def in_use_paths(self, uuid: str, ctx: DiscoveryContext) -> list:
+        """On-disk paths checked with lsof for conversation_in_use and in_use_hints (#78)."""
+        return [self.artifact_path(uuid, ctx)]
+
+    def _holder_counts(self, cmd: str) -> bool:
+        return True
+
     def conversation_in_use(self, uuid: str, ctx: DiscoveryContext) -> bool:
         """True while a live process still references the conversation."""
-        return conversation_in_use(uuid, [self.artifact_path(uuid, ctx)])
+        return conversation_in_use(uuid, self.in_use_paths(uuid, ctx))
 
     def in_use_hints(self, uuid: str, ctx: DiscoveryContext) -> list:
         """Where to look for what holds the conversation, shown when a purge
         is refused because it is in use."""
-        return [f"any process with it on its command line (an editor, a grep, ...): ps -axww | grep {uuid}"]
+        hints = [f"any process with it on its command line (an editor, a grep, ...): ps -axww | grep {uuid}"]
+        for pid, cmd in file_holders(self.in_use_paths(uuid, ctx)):
+            if self._holder_counts(cmd):
+                hints.append(f"held open by pid {pid}: {cmd}  (not stopped by MAM; end it yourself if it is safe)")
+        return hints
 
     def spawn_spec(self, binary: str, session_uuid: str = "", use_wrapper: bool = False) -> str:
         raise NotImplementedError

tests/test_issue78_hints_codex.py

@@ -0,0 +1,251 @@
+"""Issue #78: in_use_hints lists lsof holders, and codex purge removes
+tui-thread-reference-capabilities/<uuid>.
+"""
+from __future__ import annotations
+
+import json
+import os
+import sqlite3
+import subprocess
+import sys
+import uuid as uuidlib
+from pathlib import Path
+
+import pytest
+
+REPO_ROOT = Path(__file__).resolve().parent.parent
+SKILLS = REPO_ROOT / ".agents" / "skills"
+if str(SKILLS) not in sys.path:
+    sys.path.insert(0, str(SKILLS))
+
+from lib_py.agents.base import DiscoveryContext, file_holders  # noqa: E402
+from lib_py.agents.registry import get_adapter  # noqa: E402
+
+pytestmark = pytest.mark.usefixtures("own_workspace_root")
+
+
+def _clean_env(extra: dict | None = None) -> dict:
+    env = {
+        k: v
+        for k, v in os.environ.items()
+        if not k.startswith("XDG_")
+        and not k.startswith("HERDR_")
+        and k
+        not in (
+            "CLAUDE_CODE_SESSION_ID",
+            "ANTIGRAVITY_CONVERSATION_ID",
+            "HERMES_SESSION_ID",
+            "GROK_SESSION_ID",
+            "OPENCODE_SESSION_ID",
+            "CLAUDE_CONFIG_DIR",
+            "CLAUDE_PROJECT_DIR",
+            "CODEX_HOME",
+        )
+    }
+    env["PYTHONPATH"] = str(SKILLS)
+    if extra:
+        env.update(extra)
+    return env
+
+
+def _write_fake_lsof(bindir: Path, mapping: dict[str, list[int]]) -> Path:
+    """Fake lsof that prints mapped PIDs when any argument matches a key substring."""
+    bindir.mkdir(parents=True, exist_ok=True)
+    cases = []
+    for needle, pids in mapping.items():
+        echoes = "\n".join(f"      echo {p}" for p in pids)
+        cases.append(f"    *{needle}*)\n{echoes}\n      found=1 ;;")
+    body = "\n".join(cases)
+    exe = bindir / "lsof"
+    exe.write_text(
+        "#!/bin/sh\n"
+        "found=0\n"
+        'for a in "$@"; do\n'
+        '  case "$a" in\n'
+        f"{body}\n"
+        "  esac\n"
+        "done\n"
+        '[ "$found" = "1" ] && exit 0\n'
+        "exit 1\n",
+        encoding="utf-8",
+    )
+    exe.chmod(0o755)
+    return exe
+
+
+def _materialize_artifact(agent: str, conv: str, ctx: DiscoveryContext) -> str:
+    adapter = get_adapter(agent)
+    if agent == "agy":
+        # Hold the presence lock so agy's in_use_paths (_artifact_paths) is exercised too.
+        paths = adapter._artifact_paths(conv, ctx)
+        target = paths[-1]
+    else:
+        target = adapter.artifact_path(conv, ctx)
+    Path(target).parent.mkdir(parents=True, exist_ok=True)
+    Path(target).write_text("{}\n", encoding="utf-8")
+    return target
+
+
+@pytest.mark.parametrize("agent", ["claude", "agy", "codex", "grok", "hermes"])
+def test_in_use_hints_list_lsof_holders(tmp_path, monkeypatch, agent):
+    home = tmp_path / "home"
+    ws = tmp_path / "ws"
+    bindir = tmp_path / "bin"
+    no_lsof_bin = tmp_path / "no-lsof-bin"
+    for d in (home, ws, bindir, no_lsof_bin):
+        d.mkdir(parents=True, exist_ok=True)
+
+    # Populate no_lsof_bin with symlinks to basic tools (ps) but not lsof.
+    for tool in ("ps", "sh", "bash"):
+        for sysdir in ("/bin", "/usr/bin"):
+            cand = Path(sysdir) / tool
+            if cand.exists() and not (no_lsof_bin / tool).exists():
+                (no_lsof_bin / tool).symlink_to(cand)
+
+    conv = str(uuidlib.uuid4())
+    monkeypatch.setenv("HOME", str(home))
+    monkeypatch.setenv("HOME_DIR", str(home))
+    monkeypatch.setenv("CODEX_HOME", str(home / ".codex"))
+    ctx = DiscoveryContext(workspace=str(ws), agent_name=agent, home_dir=str(home))
+    target = _materialize_artifact(agent, conv, ctx)
+    adapter = get_adapter(agent)
+
+    holder = subprocess.Popen(["sleep", "300"])
+    try:
+        _write_fake_lsof(bindir, {conv: [holder.pid]})
+        env = _clean_env({
+            "HOME": str(home),
+            "HOME_DIR": str(home),
+            "CODEX_HOME": str(home / ".codex"),
+            "PATH": f"{bindir}:{os.environ.get('PATH', '')}",
+        })
+        res = subprocess.run(
+            [sys.executable, "-m", "lib_py.agents", "in-use", agent, conv, str(ws)],
+            capture_output=True,
+            text=True,
+            env=env,
+            timeout=30,
+        )
+        assert res.returncode == 4, res.stdout + res.stderr
+        assert json.loads(res.stdout) == {"agent": agent, "in_use": True}
+        assert f"ps -axww | grep {conv}" in res.stderr
+        assert f"held open by pid {holder.pid}:" in res.stderr
+        assert "sleep 300" in res.stderr
+        assert "not stopped by MAM" in res.stderr
+
+        monkeypatch.setenv("PATH", env["PATH"])
+        hints = adapter.in_use_hints(conv, ctx)
+        if agent == "claude":
+            assert hints[0].startswith("a claude process whose session file under ")
+            assert f"ps -axww | grep {conv}" in hints[1]
+        else:
+            assert f"ps -axww | grep {conv}" in hints[0]
+        assert any(f"held open by pid {holder.pid}:" in h and "sleep 300" in h for h in hints)
+        assert target in adapter.in_use_paths(conv, ctx)
+
+        # Control: without lsof on PATH, file_holders returns [] and hints match the pre-#78 lines.
+        monkeypatch.setenv("PATH", str(no_lsof_bin))
+        assert file_holders([target]) == []
+        hints_no_lsof = adapter.in_use_hints(conv, ctx)
+        assert not any("held open by pid" in h for h in hints_no_lsof)
+        assert any(f"ps -axww | grep {conv}" in h for h in hints_no_lsof)
+    finally:
+        holder.kill()
+        holder.wait()
+
+
+def test_in_use_hints_opencode_skip_service(tmp_path, monkeypatch):
+    home = tmp_path / "home"
+    ws = tmp_path / "ws"
+    bindir = tmp_path / "bin"
+    for d in (home, ws, bindir):
+        d.mkdir(parents=True, exist_ok=True)
+
+    db = home / ".local" / "share" / "opencode" / "opencode.db"
+    db.parent.mkdir(parents=True, exist_ok=True)
+    db.write_text("", encoding="utf-8")
+
+    adapter = get_adapter("opencode")
+    monkeypatch.setattr(adapter, "_bin", lambda ctx: None)
+    monkeypatch.setenv("HOME", str(home))
+    monkeypatch.setenv("HOME_DIR", str(home))
+    ctx = DiscoveryContext(workspace=str(ws), agent_name="opencode", home_dir=str(home))
+
+    service_proc = subprocess.Popen(
+        [sys.executable, "-c", "import time; time.sleep(300)", "serve", "--service"]
+    )
+    holder_proc = subprocess.Popen(["sleep", "300"])
+    try:
+        _write_fake_lsof(bindir, {"opencode.db": [service_proc.pid, holder_proc.pid]})
+        monkeypatch.setenv("PATH", f"{bindir}:{os.environ.get('PATH', '')}")
+
+        hints = adapter.in_use_hints("ses_test78", ctx)
+        assert hints[0] == "any process with it on its command line (an editor, a grep, ...): ps -axww | grep ses_test78"
+        assert any(f"held open by pid {holder_proc.pid}:" in h and "sleep 300" in h for h in hints)
+        assert not any(f"pid {service_proc.pid}" in h or "serve --service" in h for h in hints)
+        assert hints[-1] == f"another opencode session holding {db}: lsof {db}"
+    finally:
+        for p in (service_proc, holder_proc):
+            p.kill()
+            p.wait()
+
+
+def test_stop_purge_refusal_prints_holders(mam_sandbox, mock_herdr, monkeypatch):
+    conv = str(uuidlib.uuid4())
+    name = "issue78-reviewer-claude"
+    ws = mam_sandbox
+    ctx = DiscoveryContext(workspace=str(ws), agent_name="claude", home_dir=str(mam_sandbox))
+    transcript = Path(get_adapter("claude").artifact_path(conv, ctx))
+    transcript.parent.mkdir(parents=True, exist_ok=True)
+    transcript.write_text(json.dumps({"sessionId": conv}) + "\n", encoding="utf-8")
+
+    lib = mam_sandbox / ".agents" / "skills" / "lib.sh"
+    yaml_path = mam_sandbox / ".mam" / "agent-sessions.yaml"
+    mutation = (
+        f"d['herdr_sessions'] = [{{'name': {name!r}, 'status': 'running', 'agent': 'claude', "
+        f"'role': 'reviewer', 'claude_session_id_own': {conv!r}, "
+        f"'pane': {{'cwd': {os.path.realpath(str(ws))!r}}}}}]\n"
+    )
+    res_init = subprocess.run(
+        ["bash", "-c", f'source "{lib}" && atomic_dump_yaml "{yaml_path}"'],
+        input=mutation,
+        capture_output=True,
+        text=True,
+        env=_clean_env({
+            "HOME": str(mam_sandbox),
+            "HOME_DIR": str(mam_sandbox),
+            "WORKSPACE_ROOT": str(mam_sandbox),
+            "AGENT_SESSIONS_YAML": str(yaml_path),
+        }),
+    )
+    assert res_init.returncode == 0, res_init.stdout + res_init.stderr
+
+    holder = subprocess.Popen(["sleep", "300"])
+    try:
+        bindir = mam_sandbox / ".local" / "bin"
+        _write_fake_lsof(bindir, {conv: [holder.pid]})
+        stop_sh = mam_sandbox / ".agents" / "skills" / "multi-agent-mux-stop" / "scripts" / "stop_session.sh"
+        env = _clean_env({
+            "HOME": str(mam_sandbox),
+            "HOME_DIR": str(mam_sandbox),
+            "CLAUDE_PROJECT_DIR": str(mam_sandbox / ".claude" / "projects"),
+            "WORKSPACE_ROOT": str(mam_sandbox),
+            "AGENT_SESSIONS_YAML": str(yaml_path),
+            "PATH": f"{bindir}:{os.environ.get('PATH', '')}",
+        })
+        res = subprocess.run(
+            ["bash", str(stop_sh), "--session", name, "--agent", "claude", "--purge-conversation", "--yes"],
+            capture_output=True,
+            text=True,
+            cwd=str(mam_sandbox),
+            env=env,
+            timeout=60,
+        )
+        assert res.returncode == 4, res.stdout + res.stderr
+        assert f"held open by pid {holder.pid}:" in res.stderr
+        assert "sleep 300" in res.stderr
+        assert transcript.exists()
+        assert name in yaml_path.read_text(encoding="utf-8")
+    finally:
+        holder.kill()
+        holder.wait()