fix(runtime): fold native execution into shared containment (ODY-152)

core/platform_compat.py

@@ -107,51 +107,42 @@ def pid_alive(pid: Optional[int]) -> bool:
             PROCESS_QUERY_LIMITED_INFORMATION, False, int(pid)
         )
         if not handle:
-            return False
+            return kernel32.GetLastError() != 87  # ERROR_INVALID_PARAMETER: PID absent
         try:
             code = wintypes.DWORD()
             if kernel32.GetExitCodeProcess(handle, ctypes.byref(code)):
                 return code.value == STILL_ACTIVE
-            return False
+            return True  # A failed probe does not establish death.
         finally:
             kernel32.CloseHandle(handle)
     try:
         os.kill(pid, 0)
         return True
-    except (OSError, ProcessLookupError):
+    except ProcessLookupError:
         return False
+    except OSError:
+        return True  # EPERM and other inspection failures are not ESRCH.
 
 
-def kill_process_tree(pid: Optional[int]) -> None:
-    """Terminate ``pid`` and all of its descendants.
+def kill_process_tree(pid: Optional[int]):
+    """Use the runtime's shared escalating teardown and return verified death.
 
-    POSIX: signal the whole process group (``killpg``), falling back to a plain
-    ``kill`` if the pid isn't a group leader.
-    Windows: ``taskkill /T /F`` walks and kills the child tree (there is no
-    process-group signalling).
+    Callers retaining durable PIDs must validate their recorded identity before
+    calling this compatibility entry point. Native grants retain identity at
+    spawn and use containment.release directly.
     """
-    if not pid:
-        return
-    if IS_WINDOWS:
-        try:
-            subprocess.run(
-                ["taskkill", "/F", "/T", "/PID", str(pid)],
-                stdout=subprocess.DEVNULL,
-                stderr=subprocess.DEVNULL,
-                creationflags=getattr(subprocess, "CREATE_NO_WINDOW", 0),
-            )
-        except Exception:
-            pass
-        return
-    import signal
-
-    try:
-        os.killpg(os.getpgid(pid), signal.SIGTERM)
-    except Exception:
-        try:
-            os.kill(pid, signal.SIGTERM)
-        except Exception:
-            pass
+    from src import containment
+    if not pid or int(pid) <= 0:
+        return containment.ReleaseOutcome(dead=True, escalated=False)
+    spec = containment.ContainmentSpec(workspace=os.getcwd(), env={}, wall_clock_s=1,
+                                       required=frozenset())
+    grant = containment.ContainmentGrant(
+        id="", mechanism="windows_tree" if IS_WINDOWS else "process_group",
+        workspace=spec.workspace, enforced=frozenset(), degraded=(),
+        unenforced_required=(), owner="compatibility", mode=containment.CONTAINMENT_MODE,
+        spec=spec, pid=int(pid), pgid=containment._pgid_of(int(pid)),
+    )
+    return containment.release(grant)
 
 
 # ── Shell / executable resolution ───────────────────────────────────────────

src/agent_tools/subprocess_tools.py

@@ -811,6 +811,66 @@ async def _run_subprocess_streaming(
         timed_out,
     )
 
+def _owned_spec(cwd: str, env: Optional[dict], timeout: int) -> containment.ContainmentSpec:
+    """Server-defined boundary shared by the native execution tools."""
+    readonly = []
+    for prefix in (sys.prefix, sys.base_prefix):
+        prefix = os.path.realpath(prefix)
+        if not _namespace_visible_without_bind(prefix) and prefix not in _NAMESPACE_RESERVED_DESTS:
+            readonly.append(prefix)
+    return containment.agent_spec(
+        cwd, dict(os.environ if env is None else env), timeout,
+        readonly_extra=tuple(dict.fromkeys(readonly)),
+    )
+
+
+async def _run_owned_command(command, ctx: dict, *, tool: str, timeout: int, argv: bool = False) -> dict:
+    from src.tool_execution import agent_cwd, _truncate
+
+    grant = None
+    try:
+        grant = containment.acquire(
+            _owned_spec(agent_cwd(), ctx.get("subproc_env"), timeout),
+            owner=str(ctx.get("session_id") or ctx.get("owner") or tool),
+        )
+        if containment.FILESYSTEM not in grant.enforced:
+            if argv:
+                command = [*command[:-1], _replace_workspace_alias(command[-1], grant.workspace)]
+            else:
+                command = _replace_workspace_alias(command, grant.workspace)
+        result = await containment.run(grant, command, argv=argv, progress_cb=ctx.get("progress_cb"))
+    except containment.ContainmentUnavailable as exc:
+        return containment.unavailable_tool_result(exc, tool=tool)
+    except (OSError, RuntimeError, ValueError) as exc:
+        return {"error": f"{tool}: execution failed: {exc}", "exit_code": 1,
+                "containment": grant.to_dict() if grant else {"contained": False, "executed": False}}
+
+    boundary = result.grant.to_dict()
+    boundary["executed"] = True
+    teardown = result.release.to_dict() if result.release else {"dead": False}
+    output = result.stdout.rstrip()
+    if result.stderr.rstrip():
+        output = (output + "\nSTDERR: " + result.stderr.rstrip()).strip()
+    truncated = result.output_truncated or len(output) > MAX_OUTPUT_CHARS
+    common = {"containment": boundary, "teardown": teardown, "output_truncated": truncated}
+    if not teardown["dead"]:
+        return {**common, "error": f"{tool}: process teardown could not verify death",
+                "failure_kind": "process_teardown_failed", "exit_code": 1,
+                "stdout": _truncate(result.stdout, MAX_OUTPUT_CHARS),
+                "stderr": _truncate(result.stderr, MAX_OUTPUT_CHARS)}
+    if result.timed_out:
+        return {**common, "error": f"{tool}: timed out after {timeout}s; process tree terminated",
+                "exit_code": 124, "stdout": _truncate(result.stdout, MAX_OUTPUT_CHARS),
+                "stderr": _truncate(result.stderr, MAX_OUTPUT_CHARS)}
+    if tool == "python":
+        child_failure = _python_child_runtime_failure(result.stdout, result.stderr, result.exit_code)
+        if child_failure:
+            return {**common, "error": _truncate("python: a child operation failed despite a zero Python exit status:\n" + child_failure, MAX_OUTPUT_CHARS),
+                    "exit_code": 1, "stderr": _truncate(result.stderr, MAX_OUTPUT_CHARS)}
+    return {**common, "output": _truncate(output, MAX_OUTPUT_CHARS) or "(no output)",
+            "exit_code": result.exit_code if result.exit_code is not None else 1}
+
+
 class BashTool:
     async def execute(self, content: str, ctx: dict) -> dict:
         from src.tool_execution import agent_cwd, _truncate
@@ -861,14 +921,14 @@ class BashTool:
         if "/tmp/" in content:
             isolated_tmp = _isolated_tmp_dir(agent_cwd())
             content = content.replace("/tmp/", isolated_tmp.rstrip("/") + "/")
-        try:
-            content, boundary, _confined = _contained_command(content, agent_cwd())
-        except containment.ContainmentUnavailable as exc:
-            return containment.unavailable_tool_result(exc, tool="bash")
         progress_cb = ctx.get("progress_cb")
         _subproc_env = ctx.get("subproc_env")
         session_id = ctx.get("session_id")
         if not IS_WINDOWS and session_id and shutil.which("tmux"):
+            try:
+                content, boundary, _confined = _contained_command(content, agent_cwd())
+            except containment.ContainmentUnavailable as exc:
+                return containment.unavailable_tool_result(exc, tool="bash")
             stdout, stderr, rc, timed_out = await _run_tmux_bash(
                 content,
                 session_id=str(session_id),
@@ -897,40 +957,7 @@ class BashTool:
                 "containment": boundary,
             }
 
-        try:
-            if IS_WINDOWS:
-                proc = await _create_bash_subprocess(
-                    content,
-                    cwd=agent_cwd(),
-                    env=_subproc_env,
-                )
-            else:
-                # Preserve the existing captured POSIX path; the structural
-                # helper is primarily needed to avoid cmd.exe on Windows.
-                proc = await asyncio.create_subprocess_shell(
-                    content,
-                    stdin=asyncio.subprocess.DEVNULL,
-                    stdout=asyncio.subprocess.PIPE,
-                    stderr=asyncio.subprocess.PIPE,
-                    env=_subproc_env,
-                    cwd=agent_cwd(),
-                )
-        except RuntimeError as exc:
-            return {"error": str(exc), "exit_code": 1, "containment": boundary}
-        mark_operation_started('subprocess', pid=proc.pid)
-        stdout, stderr, rc, timed_out = await _run_subprocess_streaming(
-            proc,
-            timeout=DEFAULT_BASH_TIMEOUT,
-            progress_cb=progress_cb,
-        )
-        if timed_out:
-            return {"error": f"bash: timed out after {DEFAULT_BASH_TIMEOUT}s — process killed", "exit_code": 124, "stdout": _truncate(stdout, MAX_OUTPUT_CHARS), "stderr": _truncate(stderr, MAX_OUTPUT_CHARS), "containment": boundary}
-        output = stdout.rstrip()
-        err = stderr.rstrip()
-        if err:
-            output = (output + "\nSTDERR: " + err).strip() if output else "STDERR: " + err
-        output = _truncate(output, MAX_OUTPUT_CHARS)
-        return {"output": output or "(no output)", "exit_code": rc or 0, "containment": boundary}
+        return await _run_owned_command(content, ctx, tool="bash", timeout=DEFAULT_BASH_TIMEOUT)
 
 class HostShellTool:
     async def execute(self, content: str, ctx: dict) -> dict:

src/containment.py

@@ -238,6 +238,8 @@ class ContainmentGrant:
             "unenforced_required": list(self.unenforced_required),
             "contained": self.contained,
             "external": self.external,
+            "requested": sorted(self.spec.requested),
+            "network": self.spec.network,
         }
 
 
@@ -815,6 +817,12 @@ def _bwrap_prefix(spec: ContainmentSpec) -> list[str]:
         "--dev-bind", "/dev", "/dev", "--proc", "/proc",
         "--dir", WORKSPACE_MOUNT, "--bind", spec.workspace, WORKSPACE_MOUNT,
     ]
+    # Preserve absolute workspace paths in generated scripts without exposing
+    # a writable parent directory.
+    workspace = os.path.realpath(spec.workspace)
+    if workspace not in _RESERVED_BIND_DESTS and workspace not in {"/usr", "/etc"}:
+        args.extend(_dir_chain(workspace))
+        args.extend(("--bind", workspace, workspace))
     for path in spec.readonly_extra:
         args.extend(_dir_chain(path))
         args.extend(("--ro-bind", path, path))
@@ -873,6 +881,8 @@ def _launch_argv(grant: ContainmentGrant, command: Any, *, argv: bool) -> list[s
         else:
             shell = find_bash()
             if not shell:
+                if IS_WINDOWS:
+                    raise RuntimeError("Git Bash is required for the Bash tool on Windows; install Git for Windows.")
                 raise RuntimeError(
                     "containment: no POSIX shell available to run a shell command"
                 )
@@ -912,7 +922,7 @@ async def _drain(stream, buffer: list[str], budget: list[int]) -> None:
     if stream is None:
         return
     while True:
-        line = await stream.readline()
+        line = await stream.read(65536)
         if not line:
             break
         if budget[0] < 0:
@@ -956,15 +966,23 @@ async def run(
 
     spec = grant.spec
     launch = _launch_argv(grant, command, argv=argv)
-    proc = await asyncio.create_subprocess_exec(
-        *launch,
-        stdin=asyncio.subprocess.PIPE if stdin is not None else asyncio.subprocess.DEVNULL,
-        stdout=asyncio.subprocess.PIPE,
-        stderr=asyncio.subprocess.PIPE,
-        cwd=spec.workspace,
-        env=dict(spec.env),
-        **_spawn_kwargs(grant),
-    )
+    try:
+        proc = await asyncio.create_subprocess_exec(
+            *launch,
+            stdin=asyncio.subprocess.PIPE if stdin is not None else asyncio.subprocess.DEVNULL,
+            stdout=asyncio.subprocess.PIPE,
+            stderr=asyncio.subprocess.PIPE,
+            cwd=spec.workspace,
+            env=dict(spec.env),
+            **_spawn_kwargs(grant),
+        )
+    except BaseException:
+        # Acquisition can precede a failed or cancelled spawn. A grant without
+        # a child must not become a permanent restart orphan.
+        release(grant, grace_s=0)
+        raise
+    from src.agent_runtime.journal import mark_operation_started
+    mark_operation_started("subprocess", pid=proc.pid)
     # start_new_session makes the child its own group leader, so the group id
     # is the child's pid. Captured here rather than at teardown: once the leader
     # exits, getpgid can no longer tell us which group its children are in.
@@ -991,16 +1009,18 @@ async def run(
         asyncio.create_task(_drain(proc.stdout, out_buf, out_budget)),
         asyncio.create_task(_drain(proc.stderr, err_buf, err_budget)),
     ]
-    if stdin is not None and proc.stdin is not None:
-        try:
-            proc.stdin.write(stdin)
-            await proc.stdin.drain()
-        except Exception:
-            pass
-        try:
-            proc.stdin.close()
-        except Exception:
-            pass
+    async def _wait() -> None:
+        # Pipe backpressure is execution time too. Feeding a child that never
+        # reads stdin must remain inside the same timeout/cancellation scope.
+        if stdin is not None and proc.stdin is not None:
+            try:
+                proc.stdin.write(stdin)
+                await proc.stdin.drain()
+            except (BrokenPipeError, ConnectionResetError):
+                pass
+            finally:
+                proc.stdin.close()
+        await proc.wait()
 
     async def _progress() -> None:
         while True:
@@ -1016,7 +1036,7 @@ async def run(
     outcome: Optional[ReleaseOutcome] = None
     try:
         try:
-            await asyncio.wait_for(proc.wait(), timeout=spec.wall_clock_s)
+            await asyncio.wait_for(_wait(), timeout=spec.wall_clock_s)
         except asyncio.TimeoutError:
             timed_out = True
             outcome = await _release_awaited(live, proc)
@@ -1056,12 +1076,8 @@ async def run(
 
 
 # ── release ─────────────────────────────────────────────────────────────────
-# These primitives duplicate the escalating teardown that PR #46 adds to
-# core/platform_compat.kill_process_tree. They are here because this branch is
-# cut from a lab SHA that predates it, and containment cannot ship a teardown
-# that only sends SIGTERM. When #46 lands, release() should delegate to that
-# function and the helpers below should go — carrying two copies of a
-# process-group kill is exactly the divergence this module exists to end.
+# core.platform_compat.kill_process_tree delegates here as well. Native tools,
+# detached jobs and compatibility callers share escalation and death probes.
 def _own_pgid() -> int:
     try:
         return os.getpgid(0)
@@ -1097,8 +1113,10 @@ def _group_present(pgid: Optional[int]) -> bool:
     try:
         os.killpg(pgid, 0)
         return True
-    except (OSError, ProcessLookupError):
+    except ProcessLookupError:
         return False
+    except OSError:
+        return True  # EPERM is a live group we cannot signal, not verified death.
 
 
 def _signal_tree(pid: Optional[int], pgid: Optional[int], sig: int) -> None:
@@ -1188,7 +1206,11 @@ def _ownership_gate(
     """
     verdict = process_ownership.verify(pid, token)
     if verdict == process_ownership.OWNED:
-        return None
+        if IS_WINDOWS or not pgid or _pgid_of(pid) == pgid:
+            return None
+        # A valid leader identity does not establish ownership of an arbitrary
+        # recorded process group. Refuse a stale or inconsistent PGID.
+        verdict = process_ownership.UNVERIFIABLE
 
     if verdict == process_ownership.GONE:
         # The leader is gone. Its group may still hold processes it
@@ -1268,6 +1290,10 @@ def release(grant: ContainmentGrant, *, grace_s: float = 2.0) -> ReleaseOutcome:
         pgid = int(pgid) if pgid else None
     except (TypeError, ValueError):
         pgid = None
+    if pid <= 0:
+        pid = 0
+    if pgid is not None and pgid <= 0:
+        pgid = None
     grant = replace(grant, pid=pid or None, pgid=pgid)
 
     if not pid and not _group_present(pgid):

src/process_reaper.py

@@ -73,6 +73,12 @@ def reap_containment_grants() -> Dict[str, Any]:
             continue
         verdict = process_ownership.verify_record(record)
         if verdict == process_ownership.GONE:
+            if containment._group_present(record.get("pgid")):
+                # Leader death does not prove tree death. Without a surviving
+                # identity we cannot signal the group, so retain the evidence.
+                report["failed"] += 1
+                logger.error("process_reaper: grant %s leader is gone but group survives", grant_id)
+                continue
             containment.forget(grant_id)
             report["already_gone"] += 1
             continue

tests/containment_helpers.py

@@ -0,0 +1,31 @@
+"""Captured spawns exercise the production runner without signalling fake PIDs."""
+import asyncio
+from types import SimpleNamespace
+
+from src import containment
+
+
+def capture_owned_spawn(monkeypatch, tmp_path):
+    captured = {}
+    monkeypatch.setattr(containment, "CONTAINMENT_MODE", containment.MODE_REPORT_ONLY)
+    monkeypatch.setattr(containment, "_store_path", lambda: tmp_path / "grants.json")
+    monkeypatch.setattr(containment, "_pgid_of", lambda pid: pid)
+
+    async def fake_exec(*argv, **kwargs):
+        captured.update(argv=argv, kwargs=kwargs, command=argv[-1])
+        stdout = asyncio.StreamReader()
+        stdout.feed_data(b"ok")
+        stdout.feed_eof()
+        stderr = asyncio.StreamReader()
+        stderr.feed_eof()
+        async def wait():
+            return 0
+        return SimpleNamespace(pid=99999999, stdout=stdout, stderr=stderr,
+                               returncode=0, wait=wait)
+
+    async def release(*args, **kwargs):
+        return containment.ReleaseOutcome(dead=True, escalated=False)
+
+    monkeypatch.setattr(asyncio, "create_subprocess_exec", fake_exec)
+    monkeypatch.setattr(containment, "_release_awaited", release)
+    return captured

tests/test_agent_bash_tmux_env.py

@@ -188,25 +188,14 @@ def test_direct_bash_subprocess_has_closed_stdin(monkeypatch, tmp_path):
     from src.agent_tools import subprocess_tools
     from src import tool_execution
 
-    captured = {}
-    sentinel = SimpleNamespace(pid=12345)
-
-    async def fake_create(command, **kwargs):
-        captured.update(kwargs)
-        return sentinel
-
-    async def fake_stream(proc, **_kwargs):
-        assert proc is sentinel
-        return "ok", "", 0, False
-
-    monkeypatch.setattr(asyncio, "create_subprocess_shell", fake_create)
-    monkeypatch.setattr(subprocess_tools, "_run_subprocess_streaming", fake_stream)
+    from tests.containment_helpers import capture_owned_spawn
+    captured = capture_owned_spawn(monkeypatch, tmp_path)
     monkeypatch.setattr(tool_execution, "agent_cwd", lambda: str(tmp_path))
 
     result = asyncio.run(subprocess_tools.BashTool().execute("echo ok", {}))
 
     assert result["exit_code"] == 0
-    assert captured["stdin"] is asyncio.subprocess.DEVNULL
+    assert captured["kwargs"]["stdin"] is asyncio.subprocess.DEVNULL
     assert not (tmp_path / ".tmp").exists()
 
 
@@ -258,19 +247,8 @@ def test_bash_allows_unicode_ffmpeg_drawtext_with_explicit_fontfile(monkeypatch,
     from src.agent_tools import subprocess_tools
     from src import tool_execution
 
-    captured = {}
-    sentinel = SimpleNamespace(pid=12345)
-
-    async def fake_create(command, **kwargs):
-        captured["command"] = command
-        return sentinel
-
-    async def fake_stream(proc, **_kwargs):
-        assert proc is sentinel
-        return "ok", "", 0, False
-
-    monkeypatch.setattr(asyncio, "create_subprocess_shell", fake_create)
-    monkeypatch.setattr(subprocess_tools, "_run_subprocess_streaming", fake_stream)
+    from tests.containment_helpers import capture_owned_spawn
+    captured = capture_owned_spawn(monkeypatch, tmp_path)
     monkeypatch.setattr(tool_execution, "agent_cwd", lambda: str(tmp_path))
 
     command = (

tests/test_agent_bash_windows.py

@@ -6,6 +6,8 @@ import pytest
 from types import SimpleNamespace
 
 from src.agent_tools import subprocess_tools
+from src import containment
+from tests.containment_helpers import capture_owned_spawn
 
 
 @pytest.mark.asyncio
@@ -84,26 +86,17 @@ async def test_windows_bash_applies_the_subprocess_env(monkeypatch):
 
 
 @pytest.mark.asyncio
-async def test_windows_bash_tool_passes_ctx_env_through_to_the_child(monkeypatch):
-    captured = {}
+async def test_windows_bash_tool_passes_ctx_env_through_to_the_child(monkeypatch, tmp_path):
+    captured = capture_owned_spawn(monkeypatch, tmp_path)
     env = {"PATH": r"C:\Odysseus\venv\Scripts", "VIRTUAL_ENV": r"C:\Odysseus\venv"}
 
     monkeypatch.setattr(subprocess_tools, "IS_WINDOWS", True)
     monkeypatch.setattr(
         subprocess_tools, "find_bash", lambda: r"C:\Program Files\Git\bin\bash.exe"
     )
-    monkeypatch.setattr("src.tool_execution.agent_cwd", lambda: r"D:\Workspaces\Project")
-
-    async def fake_exec(*argv, **kwargs):
-        captured["argv"] = argv
-        captured["kwargs"] = kwargs
-        return SimpleNamespace(pid=4242)
-
-    async def fake_stream(_process, **_kwargs):
-        return "ok", "", 0, False
-
-    monkeypatch.setattr(subprocess_tools.asyncio, "create_subprocess_exec", fake_exec)
-    monkeypatch.setattr(subprocess_tools, "_run_subprocess_streaming", fake_stream)
+    monkeypatch.setattr(containment, "IS_WINDOWS", True)
+    monkeypatch.setattr(containment, "find_bash", lambda: r"C:\Program Files\Git\bin\bash.exe")
+    monkeypatch.setattr("src.tool_execution.agent_cwd", lambda: str(tmp_path))
 
     result = await subprocess_tools.BashTool().execute(
         "pwd",
@@ -134,9 +127,13 @@ async def test_windows_bash_without_git_bash_fails_clearly(monkeypatch):
 
 
 @pytest.mark.asyncio
-async def test_bash_tool_returns_install_hint_when_git_bash_is_missing(monkeypatch):
+async def test_bash_tool_returns_install_hint_when_git_bash_is_missing(monkeypatch, tmp_path):
+    capture_owned_spawn(monkeypatch, tmp_path)
     monkeypatch.setattr(subprocess_tools, "IS_WINDOWS", True)
     monkeypatch.setattr(subprocess_tools, "find_bash", lambda: None)
+    monkeypatch.setattr(containment, "IS_WINDOWS", True)
+    monkeypatch.setattr(containment, "find_bash", lambda: None)
+    monkeypatch.setattr("src.tool_execution.agent_cwd", lambda: str(tmp_path))
 
     result = await subprocess_tools.BashTool().execute(
         "pwd",
@@ -148,11 +145,13 @@ async def test_bash_tool_returns_install_hint_when_git_bash_is_missing(monkeypat
 
 
 @pytest.mark.asyncio
-async def test_windows_bash_does_not_use_a_stray_tmux_executable(monkeypatch):
-    captured = {}
-    workspace = r"D:\Workspaces\Project with spaces"
+async def test_windows_bash_does_not_use_a_stray_tmux_executable(monkeypatch, tmp_path):
+    captured = capture_owned_spawn(monkeypatch, tmp_path)
+    workspace = str(tmp_path)
 
     monkeypatch.setattr(subprocess_tools, "IS_WINDOWS", True)
+    monkeypatch.setattr(containment, "IS_WINDOWS", True)
+    monkeypatch.setattr(containment, "find_bash", lambda: r"C:\Program Files\Git\bin\bash.exe")
     monkeypatch.setattr(
         subprocess_tools.shutil,
         "which",
@@ -163,17 +162,7 @@ async def test_windows_bash_does_not_use_a_stray_tmux_executable(monkeypatch):
     async def fail_tmux(*_args, **_kwargs):
         pytest.fail("native Windows must not enter the POSIX tmux path")
 
-    async def fake_create(command, **kwargs):
-        captured["command"] = command
-        captured["kwargs"] = kwargs
-        return SimpleNamespace(pid=12345)
-
-    async def fake_stream(_process, **_kwargs):
-        return "ok", "", 0, False
-
     monkeypatch.setattr(subprocess_tools, "_run_tmux_bash", fail_tmux)
-    monkeypatch.setattr(subprocess_tools, "_create_bash_subprocess", fake_create)
-    monkeypatch.setattr(subprocess_tools, "_run_subprocess_streaming", fake_stream)
 
     result = await subprocess_tools.BashTool().execute(
         "pwd",
@@ -185,7 +174,7 @@ async def test_windows_bash_does_not_use_a_stray_tmux_executable(monkeypatch):
     # Every bash result now carries the execution boundary it actually got.
     # Asserting dict equality here would make that field impossible to add
     # without touching a test about tmux, so the shape is asserted instead.
-    assert result["containment"]["reported_dimensions"] == ["filesystem"]
+    assert result["containment"]["network"] == "inherit"
     assert captured["command"] == "pwd"
     assert captured["kwargs"]["cwd"] == workspace
 

tests/test_native_execution_containment.py

@@ -0,0 +1,106 @@
+"""Native execution must use the shared boundary and report actual teardown."""
+import asyncio
+import os
+import sys
+
+import pytest
+
+from src import containment, tool_execution
+from src.agent_tools import subprocess_tools
+
+
+@pytest.fixture(autouse=True)
+def native_boundary(tmp_path, monkeypatch):
+    monkeypatch.setattr(tool_execution, "agent_cwd", lambda: str(tmp_path))
+    monkeypatch.setattr(containment, "_store_path", lambda: tmp_path / "grants.json")
+    monkeypatch.setattr(containment, "CONTAINMENT_MODE", containment.MODE_REPORT_ONLY)
+    monkeypatch.setattr(containment, "MECHANISMS", tuple(
+        m for m in containment.MECHANISMS if m.name == "process_group"
+    ))
+    return tmp_path
+
+
+@pytest.mark.skipif(os.name == "nt", reason="real POSIX group teardown")
+async def test_native_bash_owns_and_releases_its_child(native_boundary):
+    result = await subprocess_tools.BashTool().execute(
+        "if read answer; then echo unexpected; else printf '%s' \"$ODY_TEST_ENV\"; fi",
+        {"subproc_env": {"PATH": "/usr/bin:/bin", "ODY_TEST_ENV": "captured"}},
+    )
+    assert result["output"] == "captured"
+    assert result["exit_code"] == 0
+    assert result["teardown"]["dead"] is True
+    assert result["containment"]["enforced"] == ["process_tree", "wall_clock"]
+    assert result["containment"]["unenforced_required"] == ["filesystem"]
+    assert result["containment"]["network"] == "inherit"
+    assert containment.active_grants() == []
+
+
+async def test_native_bash_refuses_before_spawn_when_required_boundary_missing(monkeypatch):
+    monkeypatch.setattr(containment, "CONTAINMENT_MODE", containment.MODE_ENFORCING)
+    async def forbidden(*args, **kwargs):
+        pytest.fail("refused command reached spawn")
+    monkeypatch.setattr(asyncio, "create_subprocess_exec", forbidden)
+    result = await subprocess_tools.BashTool().execute("echo hello", {})
+    assert result["containment"]["executed"] is False
+    assert result["containment"]["unenforced_required"] == ["filesystem"]
+
+
+async def test_failed_spawn_releases_unstarted_grant(native_boundary, monkeypatch):
+    async def fail(*args, **kwargs):
+        raise OSError("spawn failed")
+    monkeypatch.setattr(asyncio, "create_subprocess_exec", fail)
+    result = await subprocess_tools.BashTool().execute("echo hello", {})
+    assert result["exit_code"] == 1
+    assert containment.active_grants() == []
+
+
+@pytest.mark.skipif(os.name == "nt", reason="real POSIX process")
+async def test_long_line_is_drained_and_truncation_reported(native_boundary):
+    spec = containment.ContainmentSpec(
+        workspace=str(native_boundary), env=dict(os.environ), wall_clock_s=5,
+        required=frozenset({containment.PROCESS_TREE, containment.WALL_CLOCK}),
+        max_output_bytes=100,
+    )
+    result = await containment.run(containment.acquire(spec, owner="long-line"),
+        [sys.executable, "-c", "print('x' * 200000)"], argv=True)
+    assert result.exit_code == 0
+    assert result.stdout == "x" * 100
+    assert result.output_truncated is True
+    assert result.release.dead is True
+
+
+@pytest.mark.skipif(os.name == "nt", reason="real POSIX process")
+async def test_output_exactly_at_cap_is_complete(native_boundary):
+    spec = containment.ContainmentSpec(
+        workspace=str(native_boundary), env=dict(os.environ), wall_clock_s=5,
+        required=frozenset({containment.PROCESS_TREE, containment.WALL_CLOCK}), max_output_bytes=100,
+    )
+    result = await containment.run(containment.acquire(spec, owner="exact-cap"),
+        [sys.executable, "-c", "import sys; sys.stdout.write('x' * 100)"], argv=True)
+    assert len(result.stdout) == 100
+    assert result.output_truncated is False
+
+
+def test_permission_denied_is_not_verified_death(monkeypatch):
+    from core import platform_compat
+    def denied(*args):
+        raise PermissionError("EPERM")
+    monkeypatch.setattr(platform_compat, "IS_WINDOWS", False)
+    monkeypatch.setattr(os, "kill", denied)
+    monkeypatch.setattr(os, "killpg", denied)
+    monkeypatch.setattr(containment, "_own_pgid", lambda: 1)
+    assert platform_compat.pid_alive(987654) is True
+    assert containment._group_present(987654) is True
+
+
+@pytest.mark.skipif(os.name == "nt", reason="real POSIX process")
+async def test_blocked_stdin_is_inside_wall_clock(native_boundary):
+    spec = containment.ContainmentSpec(
+        workspace=str(native_boundary), env=dict(os.environ), wall_clock_s=1,
+        required=frozenset({containment.PROCESS_TREE, containment.WALL_CLOCK}),
+    )
+    result = await asyncio.wait_for(containment.run(
+        containment.acquire(spec, owner="blocked-stdin"), "sleep 60", stdin=b"x" * 2000000,
+    ), timeout=8)
+    assert result.timed_out is True
+    assert result.release.dead is True

tests/test_orphan_reaping.py

@@ -165,6 +165,7 @@ def test_a_gone_leader_with_a_live_group_is_reported_not_killed(
 def test_a_verified_grant_is_torn_down_normally(grant_store, monkeypatch):
     seed_grant()
     verdicts(monkeypatch, {4242: process_ownership.OWNED})
+    monkeypatch.setattr(containment, "_pgid_of", lambda pid: 4242)
     signals = []
     monkeypatch.setattr(
         containment, "_signal_tree",
@@ -179,6 +180,28 @@ def test_a_verified_grant_is_torn_down_normally(grant_store, monkeypatch):
     assert outcome.ownership == ""
 
 
+def test_verified_leader_does_not_authorize_a_different_group(grant_store, monkeypatch):
+    seed_grant(pgid=9999)
+    verdicts(monkeypatch, {4242: process_ownership.OWNED})
+    monkeypatch.setattr(containment, "_pgid_of", lambda pid: 4242)
+    monkeypatch.setattr(containment, "_signal_tree", lambda *args: pytest.fail("foreign group signalled"))
+    outcome = containment.reap_record(grant_store()["grant-1"])
+    assert outcome.dead is False
+    assert outcome.ownership == process_ownership.UNVERIFIABLE
+
+
+def test_reaper_retains_a_group_after_its_leader_dies(grant_store, monkeypatch):
+    from src import process_reaper
+    seed_grant()
+    verdicts(monkeypatch, {4242: process_ownership.GONE})
+    monkeypatch.setattr(containment, "_group_present", lambda pgid: True)
+    monkeypatch.setattr(containment, "_signal_tree", lambda *args: pytest.fail("unidentified group signalled"))
+    report = process_reaper.reap_containment_grants()
+    assert report["failed"] == 1
+    assert report["already_gone"] == 0
+    assert "grant-1" in grant_store()
+
+
 def test_an_in_process_grant_is_not_subjected_to_the_gate(monkeypatch, tmp_path):
     """A grant carrying its own pid belongs to the caller holding it.
 

website/configuration-reference.md

@@ -75,7 +75,7 @@ The source tree reads **108** `ODYSSEUS_*` variables: 78 an operator may want to
 | `ODYSSEUS_MAX_VISUAL_EVIDENCE_FRAMES` | `'3'` | `src/agent_loop.py:15361` | How many video frames one tool result may contribute. Clamped to 1-8. |
 | `ODYSSEUS_MAX_VISUAL_EVIDENCE_IMAGES` | `'1'` | `src/agent_loop.py:15329` | How many images one tool result may contribute to the model turn. Clamped to 1-8. |
 | `ODYSSEUS_MCP_ALLOWED_COMMANDS` | `''` | `src/agent_tools/admin_tools.py:140` | Security-relevant. Comma-separated allowlist of MCP launcher basenames the agent may start. Empty by default, and the deny list still wins. |
-| `ODYSSEUS_PYTHON_TOOL_SITE_PACKAGES` | `''` | `src/agent_tools/subprocess_tools.py:1153` | Security-relevant. Absolute package roots, separated by the platform path separator, exposed to the sandboxed Python tool. Empty exposes none. |
+| `ODYSSEUS_PYTHON_TOOL_SITE_PACKAGES` | `''` | `src/agent_tools/subprocess_tools.py:1180` | Security-relevant. Absolute package roots, separated by the platform path separator, exposed to the sandboxed Python tool. Empty exposes none. |
 | `ODYSSEUS_SCRIPT_HOST` | `'localhost'` | `src/builtin_actions.py:919` | Default host for the run-script action. `localhost`, `127.0.0.1`, `local` and empty run locally; any other value runs over SSH. |
 | `ODYSSEUS_TOOL_APPROVAL_GATE` | `'0'` | `src/tool_capabilities.py:645` | Security-relevant. Truthy makes tool calls pass through the approval gate. Off by default. |