fix(agents): claude purge removes every path the session owns (Issue #31)

The claude purge removed only <uuid>.jsonl. It now removes everything the
session alone owns: projects/<key>/<uuid>/, file-history/<uuid>/,
session-env/<uuid>/, jobs/<uuid[:8]>/ when its state.json names the session,
a stale sessions/<pid>.json with that pid's key file (name only, never read)
and <tmp>/claude-<uid>/*/<uuid>/. An id that is empty, all dots or holds
/, .. or * builds no path. has_artifacts finds leftovers without the transcript,
and conversation_in_use also sees a live claude through sessions/<pid>.json
(a `claude -c` names no uuid on its command line); a reused pid is told
apart by ps lstart against the file's startedAt.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.agents/skills/lib_py/agents/adapters/claude.py

@@ -1,8 +1,84 @@
-import os, json, glob, subprocess
+import os, re, json, glob, time, shutil, subprocess
 from typing import Optional, Any
-from lib_py.agents.base import BaseAgentAdapter, DiscoveryContext
+from lib_py.agents.base import BaseAgentAdapter, DiscoveryContext, conversation_in_use, _plausible_id
 from lib_py.verify_session import workspace_key
 
+
+def _config_dir(ctx: DiscoveryContext) -> str:
+    return os.path.join(ctx.home_dir, ".claude")
+
+
+def _tmp_roots() -> list:
+    """The per-uid temp roots claude may have used: ${CLAUDE_CODE_TMPDIR:-
+    os.tmpdir()}/claude-<uid>. A sandboxed tool shell sets CLAUDE_CODE_TMPDIR
+    to that per-uid root itself. The session that wrote the files may have
+    run under another env, so every candidate that exists is returned."""
+    name = f"claude-{os.getuid()}"
+    cands = []
+    override = os.environ.get("CLAUDE_CODE_TMPDIR", "")
+    if override:
+        cands.append(os.path.join(override, name))
+        if os.path.basename(override.rstrip("/")) == name:
+            cands.append(override)
+    # Node's os.tmpdir() on POSIX, not tempfile.gettempdir() (which probes
+    # writability and falls back to the cwd).
+    tmp = os.environ.get("TMPDIR") or os.environ.get("TMP") or os.environ.get("TEMP") or "/tmp"
+    cands.append(os.path.join(tmp.rstrip("/") or "/", name))
+    cands.append(os.path.join("/tmp", name))
+    roots, seen = [], set()
+    for c in cands:
+        real = os.path.realpath(c)
+        if os.path.isdir(c) and real not in seen:
+            seen.add(real)
+            roots.append(c)
+    return roots
+
+
+def _session_file_live(data: dict, pid) -> bool:
+    """The process that wrote this sessions/<pid>.json is still running.
+
+    A dead pid is stale. A live pid whose start (`ps -o lstart=`) is later
+    than the file's startedAt was reused by another process, so it is stale
+    too. Anything that cannot be told is taken as live: a purge is then
+    refused, never run over a live conversation."""
+    if not isinstance(pid, int) or isinstance(pid, bool) or pid <= 0:
+        return True
+    try:
+        os.kill(pid, 0)
+    except ProcessLookupError:
+        return False
+    except OSError:
+        pass
+    try:
+        out = subprocess.run(["ps", "-p", str(pid), "-o", "lstart="], capture_output=True, text=True,
+                             timeout=5, env=dict(os.environ, LC_ALL="C")).stdout
+        lstart = time.mktime(time.strptime(" ".join(out.split()), "%a %b %d %H:%M:%S %Y"))
+        started = float(data["startedAt"]) / 1000.0
+    except Exception:
+        return True
+    # startedAt is written 1.7-3.2 s after the process starts; 2 s covers
+    # lstart's one-second resolution.
+    return lstart <= started + 2
+
+
+def _remove(path: str) -> None:
+    try:
+        if os.path.islink(path) or not os.path.isdir(path):
+            os.remove(path)
+        else:
+            shutil.rmtree(path, ignore_errors=True)
+    except OSError:
+        pass
+
+
+def _label(path: str) -> str:
+    """How a path is printed: a session key file is named by pid only, its
+    hex part is not shown."""
+    d, name = os.path.split(path)
+    m = re.fullmatch(r"(\d+)\.[0-9a-f]{64}\.key", name)
+    return os.path.join(d, f"{m.group(1)}.*.key") if m else path
+
+
 class ClaudeAgentAdapter(BaseAgentAdapter):
     @property
     def name(self) -> str:
@@ -94,12 +170,91 @@ class ClaudeAgentAdapter(BaseAgentAdapter):
             return False
         return True
 
-    def purge_artifacts(self, uuid: str, ctx: DiscoveryContext) -> list:
+    def _session_files(self, uuid: str, ctx: DiscoveryContext) -> list:
+        """(path, pid, data) of each sessions/<pid>.json naming this session -
+        the registry of running claude processes, which a live `claude -c`
+        is found by even though its command line carries no uuid."""
+        found = []
+        for path in sorted(glob.glob(os.path.join(_config_dir(ctx), "sessions", "*.json"))):
+            try:
+                with open(path) as f:
+                    data = json.load(f)
+            except Exception:
+                continue
+            if not isinstance(data, dict) or data.get("sessionId") != uuid:
+                continue
+            pid = data.get("pid")
+            if not isinstance(pid, int):
+                stem = os.path.basename(path)[:-5]
+                pid = int(stem) if stem.isdigit() else None
+            found.append((path, pid, data))
+        return found
+
+    def _owned_job(self, uuid: str, ctx: DiscoveryContext) -> Optional[str]:
+        """jobs/<first 8 chars>/ when its state.json names this session; the
+        short name alone can be another session's."""
+        job = os.path.join(_config_dir(ctx), "jobs", uuid[:8])
+        try:
+            with open(os.path.join(job, "state.json")) as f:
+                if json.load(f).get("sessionId") == uuid:
+                    return job
+        except Exception:
+            pass
+        return None
+
+    def _owned_paths(self, uuid: str, ctx: DiscoveryContext) -> list:
+        """Every existing path that belongs to this session alone (Issue #31).
+        Shared files that merely mention it (history.jsonl, ~/.claude.json,
+        backups, paste-cache) are not the session's and are never listed."""
+        # Checked before any path is built: whole directories named by the id
+        # are removed, so "", "." or ".." would reach file-history/ itself.
+        if not _plausible_id(uuid):
+            return []
+        cfg = _config_dir(ctx)
         jsonl = self.artifact_path(uuid, ctx)
-        if os.path.exists(jsonl):
-            os.remove(jsonl)
-            return [jsonl]
-        return []
+        paths = [p for p in (jsonl, jsonl[:-len(".jsonl")],
+                             os.path.join(cfg, "file-history", uuid),
+                             os.path.join(cfg, "session-env", uuid)) if os.path.lexists(p)]
+        job = self._owned_job(uuid, ctx)
+        if job:
+            paths.append(job)
+        for path, pid, data in self._session_files(uuid, ctx):
+            if _session_file_live(data, pid):
+                continue
+            paths.append(path)
+            stem = os.path.basename(path)[:-len(".json")]
+            sessions = os.path.dirname(path)
+            if stem.isdigit():
+                # The key file is matched by name only; its content is never read.
+                paths.extend(os.path.join(sessions, n) for n in sorted(os.listdir(sessions))
+                             if re.fullmatch(rf"{stem}\.[0-9a-f]{{64}}\.key", n))
+        for root in _tmp_roots():
+            try:
+                keys = sorted(os.listdir(root))
+            except OSError:
+                continue
+            paths.extend(p for p in (os.path.join(root, k, uuid) for k in keys) if os.path.lexists(p))
+        return paths
+
+    def has_artifacts(self, uuid: str, ctx: DiscoveryContext) -> bool:
+        # Leftovers count without the transcript (a pre-#31 purge left them).
+        return bool(self._owned_paths(uuid, ctx))
+
+    def conversation_in_use(self, uuid: str, ctx: DiscoveryContext) -> bool:
+        if conversation_in_use(uuid, [self.artifact_path(uuid, ctx)]):
+            return True
+        return any(_session_file_live(data, pid) for _, pid, data in self._session_files(uuid, ctx))
+
+    def purge_artifacts(self, uuid: str, ctx: DiscoveryContext) -> list:
+        # Best effort: never raises (stop runs this inside its registry
+        # transaction). What could not be removed is not listed here and
+        # shows up in residual_artifacts instead.
+        purged = []
+        for path in self._owned_paths(uuid, ctx):
+            _remove(path)
+            if not os.path.lexists(path) and _label(path) not in purged:
+                purged.append(_label(path))
+        return purged
 
     def spawn_spec(self, binary: str, session_uuid: str = "", use_wrapper: bool = False) -> str:
         if use_wrapper or not session_uuid:

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

@@ -84,6 +84,13 @@ def conversation_in_use(uuid: str, paths=()) -> bool:
             pass
     return False
 
+
+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 "*"."""
+    return isinstance(uuid, str) and bool(uuid.strip(".")) and not any(s in uuid for s in ("/", "..", "*"))
+
+
 class SpawnSpec:
     def __init__(self, agent_name: str, session_name: str, command: str, env: Optional[Dict[str, str]] = None):
         self.agent_name = agent_name