test: make process kill integration test resilient

Bugs fixed:
- files.py: use typed error checking (_raise_for_status) instead of raw
  raise_for_status(), ensuring WrennNotFoundError etc. are raised
  correctly
- exceptions.py: check both "capsule_ids" and "sandbox_ids" response
  keys
  for backwards compatibility
- code_interpreter: retry _ensure_kernel on 5xx errors (only fail on
  4xx),
  remove redundant TimeoutError in bare except, clean up non-standard
  top-level msg_id/msg_type from Jupyter messages

Resource leaks fixed:
- capsule.py: close WrennClient if capsule creation or init fails
- code_interpreter: add close()/__del__ for _proxy_client cleanup when
  not using context manager

Logic fixes:
- pty.py: yield exit events to callers instead of silently discarding
  them
- capsule.py: auto-resume paused capsules in wait_ready instead of
  failing
- capsule.py: log warnings on destroy failure in __exit__ instead of
  silently swallowing errors

.gitignore

@@ -176,6 +176,7 @@ cython_debug/
 
 CODE_EXECUTION.md
 
+.opencode/
 # AI
 .code-review-graph/
 .claude

AGENTS.md

@@ -0,0 +1,56 @@
+# AGENTS.md
+
+## Project
+
+Wrenn Python SDK — a client library for the Wrenn microVM platform. e2b drop-in replacement.
+Package name: `wrenn`. Python 3.13+, managed with [uv](https://docs.astral.sh/uv/).
+
+## Commands
+
+```bash
+uv sync                              # install deps
+make lint                            # ruff check + format check (no auto-fix)
+make test                            # unit tests only (tests/test_client.py)
+make test-integration                # all tests including integration (needs live server)
+make generate                        # regenerate models from OpenAPI spec (fetches from remote)
+make check                           # lint + unit test
+```
+
+- `make test` only runs `tests/test_client.py`, not all unit tests. To run a specific test file: `uv run pytest tests/test_capsule_features.py -v`
+- No typecheck step in Makefile or CI. `mypy` is a dev dependency but not wired up — do not assume it runs.
+
+## Architecture
+
+- `src/wrenn/` — the library package
+  - `capsule.py` / `async_capsule.py` — high-level `Capsule` / `AsyncCapsule` (main user-facing classes)
+  - `client.py` — low-level `WrennClient` / `AsyncWrennClient`
+  - `commands.py` — command execution and streaming
+  - `files.py` — filesystem operations
+  - `pty.py` — interactive terminal (PTY) over WebSocket
+  - `exceptions.py` — typed error hierarchy (`WrennError` base)
+  - `models/_generated.py` — **auto-generated** from OpenAPI spec via `datamodel-codegen` (never edit directly; run `make generate`)
+  - `sandbox.py` — deprecated `Sandbox` alias for `Capsule`
+  - `code_interpreter/` — specialized capsule for stateful Jupyter kernel execution
+- `tests/` — unit tests use `respx` to mock `httpx`; integration tests are in `tests/integration/`
+- `api/openapi.yaml` — downloaded OpenAPI spec used for code generation
+
+## Key Conventions
+
+- Generated code lives in `src/wrenn/models/_generated.py`. Never edit it. Run `make generate` to update.
+- `Sandbox` is a deprecated alias for `Capsule`. New code should use `Capsule` / `AsyncCapsule`.
+- Dual sync/async API: every major class has an `Async` counterpart.
+- Uses `httpx` for HTTP, `httpx-ws` for WebSockets, `pydantic` for models.
+- `__init__.py` uses `__getattr__` for lazy deprecated aliases (`Sandbox`, `WrennHostHasSandboxesError`).
+
+## Testing
+
+- Unit tests mock HTTP via `respx` (httpx mocking library).
+- Integration tests require env vars: `WRENN_API_KEY` (or `WRENN_TOKEN`), optionally `WRENN_BASE_URL`.
+- Integration test fixtures in `tests/integration/conftest.py` create real capsules and clean them up.
+- `pytest` marker: `@pytest.mark.integration` for tests needing a live server.
+
+## CI
+
+Woodpecker CI (`.woodpecker/check.yml`) runs on push to `main` and `dev`:
+1. `make lint`
+2. `make test` (unit tests only — integration tests are not in CI)

api/openapi.yaml

@@ -2,7 +2,7 @@ openapi: "3.1.0"
 info:
   title: Wrenn API
   description: MicroVM-based code execution platform API.
-  version: "0.1.3"
+  version: "0.1.4"
 
 servers:
   - url: http://localhost:8080

src/wrenn/_config.py

@@ -1,33 +1,5 @@
 from __future__ import annotations
 
-import os
-from dataclasses import dataclass
-
 DEFAULT_BASE_URL = "https://app.wrenn.dev/api"
 ENV_API_KEY = "WRENN_API_KEY"
 ENV_BASE_URL = "WRENN_BASE_URL"
-
-
-@dataclass(frozen=True)
-class ConnectionConfig:
-    """Resolved credentials and base URL for Wrenn API calls."""
-
-    api_key: str
-    base_url: str
-
-    @classmethod
-    def from_env(
-        cls,
-        api_key: str | None = None,
-        base_url: str | None = None,
-    ) -> ConnectionConfig:
-        resolved_key = api_key or os.environ.get(ENV_API_KEY)
-        if not resolved_key:
-            raise ValueError(
-                f"No API key provided. Pass api_key= or set the {ENV_API_KEY} environment variable."
-            )
-        resolved_url = base_url or os.environ.get(ENV_BASE_URL, DEFAULT_BASE_URL)
-        return cls(api_key=resolved_key, base_url=resolved_url)
-
-    def auth_headers(self) -> dict[str, str]:
-        return {"X-API-Key": self.api_key}

src/wrenn/async_capsule.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import asyncio
+import logging
 import builtins
 import time
 from collections.abc import AsyncIterator
@@ -242,8 +243,10 @@ class AsyncCapsule:
             if info.status == Status.running:
                 self._info = info
                 return
-            if info.status in (Status.error, Status.stopped, Status.paused):
+            if info.status in (Status.error, Status.stopped):
                 raise RuntimeError(f"Capsule entered {info.status} state while waiting")
+            if info.status == Status.paused:
+                info = await self._client.capsules.resume(self._id)
             await asyncio.sleep(interval)
         raise TimeoutError(f"Capsule {self._id} did not become ready within {timeout}s")
 
@@ -389,8 +392,8 @@ class AsyncCapsule:
     ) -> None:
         try:
             await self._instance_destroy()
-        except Exception:
+        except Exception as exc:
-            pass
+            logging.warning("Failed to destroy capsule %s: %s", self._id, exc)
         try:
             await self._client.aclose()
         except Exception:

src/wrenn/capsule.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import logging
 import builtins
 import time
 from collections.abc import Iterator
@@ -99,17 +100,24 @@ class Capsule:
             self._id: str = _capsule_id
             self._client = _client
             self._info = _info
+            if self._id is None:
+                self._client.close()
+                raise RuntimeError("API returned a capsule without an ID")
         else:
-            # Public construction: create a capsule immediately
             self._client = WrennClient(api_key=api_key, base_url=base_url)
-            self._info = self._client.capsules.create(
+            try:
-                template=template,
+                self._info = self._client.capsules.create(
-                vcpus=vcpus,
+                    template=template,
-                memory_mb=memory_mb,
+                    vcpus=vcpus,
-                timeout_sec=timeout,
+                    memory_mb=memory_mb,
-            )
+                    timeout_sec=timeout,
-            assert self._info.id is not None
+                )
-            self._id = self._info.id
+                self._id = self._info.id
+                if self._id is None:
+                    raise RuntimeError("API returned a capsule without an ID")
+            except Exception:
+                self._client.close()
+                raise
 
         self.commands = Commands(self._id, self._client.http)
         self.files = Files(self._id, self._client.http)
@@ -317,8 +325,10 @@ class Capsule:
             if info.status == Status.running:
                 self._info = info
                 return
-            if info.status in (Status.error, Status.stopped, Status.paused):
+            if info.status in (Status.error, Status.stopped):
                 raise RuntimeError(f"Capsule entered {info.status} state while waiting")
+            if info.status == Status.paused:
+                info = self._client.capsules.resume(self._id)
             time.sleep(interval)
         raise TimeoutError(f"Capsule {self._id} did not become ready within {timeout}s")
 
@@ -463,8 +473,8 @@ class Capsule:
     ) -> None:
         try:
             self._instance_destroy()
-        except Exception:
+        except Exception as exc:
-            pass
+            logging.warning("Failed to destroy capsule %s: %s", self._id, exc)
         try:
             self._client.close()
         except Exception:

src/wrenn/code_interpreter/async_capsule.py

@@ -40,6 +40,28 @@ class AsyncCapsule(BaseAsyncCapsule):
         self._kernel_id = None
         self._proxy_client = None
 
+    async def close(self) -> None:
+        if self._proxy_client is not None:
+            try:
+                await self._proxy_client.aclose()
+            except Exception:
+                pass
+            self._proxy_client = None
+
+    def __del__(self) -> None:
+        if self._proxy_client is not None:
+            try:
+                import asyncio
+
+                loop = asyncio.get_event_loop()
+                if loop.is_running():
+                    loop.create_task(self._proxy_client.aclose())
+                else:
+                    loop.run_until_complete(self._proxy_client.aclose())
+            except Exception:
+                pass
+            self._proxy_client = None
+
     @classmethod
     async def create(
         cls,
@@ -126,8 +148,10 @@ class AsyncCapsule(BaseAsyncCapsule):
                     request=resp.request,
                     response=resp,
                 )
-            except httpx.HTTPStatusError:
+            except httpx.HTTPStatusError as exc:
-                raise
+                if exc.response.status_code < 500:
+                    raise
+                last_exc = exc
             except Exception as exc:
                 last_exc = exc
             await asyncio.sleep(0.5)
@@ -164,8 +188,6 @@ class AsyncCapsule(BaseAsyncCapsule):
             },
             "buffers": [],
             "channel": "shell",
-            "msg_id": msg_id,
-            "msg_type": "execute_request",
         }
 
     async def run_code(
@@ -201,7 +223,7 @@ class AsyncCapsule(BaseAsyncCapsule):
         ws_url = self._jupyter_ws_url(kernel_id)
 
         msg = self._jupyter_execute_request(code)
-        msg_id = msg["msg_id"]
+        msg_id = msg["header"]["msg_id"]
 
         execution = Execution()
         deadline = time.monotonic() + timeout
@@ -215,7 +237,7 @@ class AsyncCapsule(BaseAsyncCapsule):
                     break
                 try:
                     data = await asyncio.wait_for(ws.receive_json(), timeout=time_left)
-                except (asyncio.TimeoutError, Exception):
+                except Exception:
                     break
                 if not data:
                     break

src/wrenn/code_interpreter/capsule.py

@@ -70,6 +70,17 @@ class Capsule(BaseCapsule):
         self._kernel_id = None
         self._proxy_client = None
 
+    def close(self) -> None:
+        if self._proxy_client is not None:
+            try:
+                self._proxy_client.close()
+            except Exception:
+                pass
+            self._proxy_client = None
+
+    def __del__(self) -> None:
+        self.close()
+
     @classmethod
     def create(
         cls,
@@ -150,8 +161,10 @@ class Capsule(BaseCapsule):
                     request=resp.request,
                     response=resp,
                 )
-            except httpx.HTTPStatusError:
+            except httpx.HTTPStatusError as exc:
-                raise
+                if exc.response.status_code < 500:
+                    raise
+                last_exc = exc
             except Exception as exc:
                 last_exc = exc
             time.sleep(0.5)
@@ -188,8 +201,6 @@ class Capsule(BaseCapsule):
             },
             "buffers": [],
             "channel": "shell",
-            "msg_id": msg_id,
-            "msg_type": "execute_request",
         }
 
     def run_code(
@@ -227,7 +238,7 @@ class Capsule(BaseCapsule):
         ws_url = self._jupyter_ws_url(kernel_id)
 
         msg = self._jupyter_execute_request(code)
-        msg_id = msg["msg_id"]
+        msg_id = msg["header"]["msg_id"]
 
         execution = Execution()
         deadline = time.monotonic() + timeout
@@ -241,7 +252,7 @@ class Capsule(BaseCapsule):
                     break
                 try:
                     data = ws.receive_json(timeout=time_left)
-                except (TimeoutError, Exception):
+                except Exception:
                     break
                 if not data:
                     break

src/wrenn/commands.py

@@ -5,7 +5,7 @@ import builtins
 import json
 from collections.abc import AsyncIterator, Iterator
 from dataclasses import dataclass
-from typing import overload, Literal
+from typing import Literal, overload
 
 import httpx
 import httpx_ws
@@ -198,7 +198,15 @@ class Commands:
         if tag is not None:
             payload["tag"] = tag
 
-        resp = self._http.post(f"/v1/capsules/{self._capsule_id}/exec", json=payload)
+        http_timeout: httpx.Timeout | None = None
+        if not background and timeout is not None:
+            http_timeout = httpx.Timeout(timeout + 10, connect=5.0)
+
+        resp = self._http.post(
+            f"/v1/capsules/{self._capsule_id}/exec",
+            json=payload,
+            timeout=http_timeout,
+        )
         data = handle_response(resp)
         assert isinstance(data, dict)
 
@@ -379,8 +387,14 @@ class AsyncCommands:
         if tag is not None:
             payload["tag"] = tag
 
+        http_timeout: httpx.Timeout | None = None
+        if not background and timeout is not None:
+            http_timeout = httpx.Timeout(timeout + 10, connect=5.0)
+
         resp = await self._http.post(
-            f"/v1/capsules/{self._capsule_id}/exec", json=payload
+            f"/v1/capsules/{self._capsule_id}/exec",
+            json=payload,
+            timeout=http_timeout,
         )
         data = handle_response(resp)
         assert isinstance(data, dict)

src/wrenn/exceptions.py

@@ -110,34 +110,43 @@ _ERROR_MAP: dict[str, type[WrennError]] = {
 }
 
 
-def handle_response(resp: httpx.Response) -> dict | list:
+def _raise_for_status(resp: httpx.Response) -> None:
-    if resp.status_code >= 400:
+    if resp.status_code < 400:
-        try:
+        return
-            body = resp.json()
-        except Exception:
-            resp.raise_for_status()
-            raise
 
-        err = body.get("error", {})
+    try:
-        code = err.get("code", "internal_error")
+        body = resp.json()
-        message = err.get("message", resp.text)
+    except Exception:
+        raise WrennInternalError(
+            code="internal_error",
+            message=resp.text or f"HTTP {resp.status_code}",
+            status_code=resp.status_code,
+        )
 
-        exc_cls = _ERROR_MAP.get(code, WrennError)
+    err = body.get("error", {})
+    code = err.get("code", "internal_error")
+    message = err.get("message", resp.text)
 
-        if exc_cls is WrennHostHasCapsulesError:
+    exc_cls = _ERROR_MAP.get(code, WrennError)
-            raise WrennHostHasCapsulesError(
-                code=code,
-                message=message,
-                status_code=resp.status_code,
-                capsule_ids=body.get("sandbox_ids", []),
-            )
 
-        raise exc_cls(
+    if exc_cls is WrennHostHasCapsulesError:
+        raise WrennHostHasCapsulesError(
             code=code,
             message=message,
             status_code=resp.status_code,
+            capsule_ids=body.get("capsule_ids") or body.get("sandbox_ids", []),
         )
 
+    raise exc_cls(
+        code=code,
+        message=message,
+        status_code=resp.status_code,
+    )
+
+
+def handle_response(resp: httpx.Response) -> dict | list:
+    _raise_for_status(resp)
+
     if resp.status_code == 204:
         return {}
 

src/wrenn/files.py

@@ -5,7 +5,7 @@ from collections.abc import AsyncIterator, Iterator
 
 import httpx
 
-from wrenn.exceptions import WrennNotFoundError, handle_response
+from wrenn.exceptions import WrennNotFoundError, _raise_for_status, handle_response
 from wrenn.models import FileEntry, ListDirResponse, MakeDirResponse
 
 
@@ -46,7 +46,7 @@ class Files:
             f"/v1/capsules/{self._capsule_id}/files/read",
             json={"path": path},
         )
-        resp.raise_for_status()
+        _raise_for_status(resp)
         return resp.content
 
     def write(self, path: str, data: str | bytes) -> None:
@@ -65,7 +65,7 @@ class Files:
             files={"file": ("upload", data)},
             data={"path": path},
         )
-        resp.raise_for_status()
+        _raise_for_status(resp)
 
     def list(self, path: str, depth: int = 1) -> list[FileEntry]:
         """List directory contents.
@@ -179,7 +179,7 @@ class Files:
                 "Content-Type": f"multipart/form-data; boundary={boundary.decode('utf-8')}"
             },
         )
-        resp.raise_for_status()
+        _raise_for_status(resp)
 
     def download_stream(self, path: str) -> Iterator[bytes]:
         """Stream a large file out of the capsule.
@@ -243,7 +243,7 @@ class AsyncFiles:
             f"/v1/capsules/{self._capsule_id}/files/read",
             json={"path": path},
         )
-        resp.raise_for_status()
+        _raise_for_status(resp)
         return resp.content
 
     async def write(self, path: str, data: str | bytes) -> None:
@@ -262,7 +262,7 @@ class AsyncFiles:
             files={"file": ("upload", data)},
             data={"path": path},
         )
-        resp.raise_for_status()
+        _raise_for_status(resp)
 
     async def list(self, path: str, depth: int = 1) -> list[FileEntry]:
         """List directory contents.
@@ -377,7 +377,7 @@ class AsyncFiles:
                 "Content-Type": f"multipart/form-data; boundary={boundary.decode('utf-8')}"
             },
         )
-        resp.raise_for_status()
+        _raise_for_status(resp)
 
     async def download_stream(self, path: str) -> AsyncIterator[bytes]:
         """Stream a large file out of the capsule.

src/wrenn/models/_generated.py

@@ -1,6 +1,6 @@
 # generated by datamodel-codegen:
 #   filename:  openapi.yaml
-#   timestamp: 2026-04-22T20:21:34+00:00
+#   timestamp: 2026-05-04T20:57:00+00:00
 
 from __future__ import annotations
 from pydantic import AwareDatetime, BaseModel, EmailStr, Field

src/wrenn/pty.py

@@ -153,7 +153,8 @@ class PtySession:
             if event.pid is not None:
                 self._pid = event.pid
         if event.type == PtyEventType.exit:
-            raise StopIteration
+            self._done = True
+            return event
         if event.type == PtyEventType.error and event.fatal:
             self._done = True
             return event
@@ -281,7 +282,8 @@ class AsyncPtySession:
             if event.pid is not None:
                 self._pid = event.pid
         if event.type == PtyEventType.exit:
-            raise StopAsyncIteration
+            self._done = True
+            return event
         if event.type == PtyEventType.error and event.fatal:
             self._done = True
             return event

tests/test_capsule_features.py

@@ -32,7 +32,7 @@ class TestCapsuleCreate:
         respx.post(f"{BASE}/v1/capsules").respond(
             201, json={"id": "cl-1", "status": "pending", "template": "minimal"}
         )
-        cap = Capsule(template="minimal", api_key="wrn_test1234567890abcdef12345678")
+        cap = Capsule(template="minimal", api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert cap.capsule_id == "cl-1"
         assert hasattr(cap, "commands")
         assert hasattr(cap, "files")
@@ -42,7 +42,7 @@ class TestCapsuleCreate:
         respx.post(f"{BASE}/v1/capsules").respond(
             201, json={"id": "cl-2", "status": "pending"}
         )
-        cap = Capsule.create(api_key="wrn_test1234567890abcdef12345678")
+        cap = Capsule.create(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert cap.capsule_id == "cl-2"
 
     @respx.mock
@@ -51,7 +51,7 @@ class TestCapsuleCreate:
             201, json={"id": "cl-1", "status": "pending"}
         )
         kill_route = respx.delete(f"{BASE}/v1/capsules/cl-1").respond(204)
-        with Capsule(api_key="wrn_test1234567890abcdef12345678") as cap:
+        with Capsule(api_key="wrn_test1234567890abcdef12345678", base_url=BASE) as cap:
             assert cap.capsule_id == "cl-1"
         assert kill_route.called
 
@@ -61,7 +61,7 @@ class TestCapsuleCreate:
         respx.post(f"{BASE}/v1/capsules").respond(
             201, json={"id": "cl-3", "status": "pending"}
         )
-        cap = Capsule()
+        cap = Capsule(base_url=BASE)
         assert cap.capsule_id == "cl-3"
 
 
@@ -69,7 +69,7 @@ class TestCapsuleStaticMethods:
     @respx.mock
     def test_static_destroy(self):
         route = respx.delete(f"{BASE}/v1/capsules/cl-1").respond(204)
-        Capsule._static_destroy("cl-1", api_key="wrn_test1234567890abcdef12345678")
+        Capsule._static_destroy("cl-1", api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert route.called
 
     @respx.mock
@@ -77,7 +77,7 @@ class TestCapsuleStaticMethods:
         respx.post(f"{BASE}/v1/capsules/cl-1/pause").respond(
             200, json={"id": "cl-1", "status": "paused"}
         )
-        info = Capsule._static_pause("cl-1", api_key="wrn_test1234567890abcdef12345678")
+        info = Capsule._static_pause("cl-1", api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert info.status.value == "paused"
 
     @respx.mock
@@ -85,7 +85,7 @@ class TestCapsuleStaticMethods:
         respx.get(f"{BASE}/v1/capsules").respond(
             200, json=[{"id": "cl-1", "status": "running"}]
         )
-        items = Capsule.list(api_key="wrn_test1234567890abcdef12345678")
+        items = Capsule.list(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert len(items) == 1
         assert items[0].id == "cl-1"
 
@@ -95,7 +95,7 @@ class TestCapsuleStaticMethods:
             200, json={"id": "cl-1", "status": "running"}
         )
         info = Capsule._static_get_info(
-            "cl-1", api_key="wrn_test1234567890abcdef12345678"
+            "cl-1", api_key="wrn_test1234567890abcdef12345678", base_url=BASE
         )
         assert info.id == "cl-1"
 
@@ -106,7 +106,7 @@ class TestCapsuleConnect:
         respx.get(f"{BASE}/v1/capsules/cl-1").respond(
             200, json={"id": "cl-1", "status": "running"}
         )
-        cap = Capsule.connect("cl-1", api_key="wrn_test1234567890abcdef12345678")
+        cap = Capsule.connect("cl-1", api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert cap.capsule_id == "cl-1"
 
     @respx.mock
@@ -117,7 +117,7 @@ class TestCapsuleConnect:
         respx.post(f"{BASE}/v1/capsules/cl-1/resume").respond(
             200, json={"id": "cl-1", "status": "running"}
         )
-        cap = Capsule.connect("cl-1", api_key="wrn_test1234567890abcdef12345678")
+        cap = Capsule.connect("cl-1", api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert cap.capsule_id == "cl-1"
 
 

tests/test_client.py

@@ -23,13 +23,13 @@ BASE = "https://app.wrenn.dev/api"
 
 @pytest.fixture
 def client():
-    with WrennClient(api_key="wrn_test1234567890abcdef12345678") as c:
+    with WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE) as c:
         yield c
 
 
 @pytest.fixture
 def async_client():
-    return AsyncWrennClient(api_key="wrn_test1234567890abcdef12345678")
+    return AsyncWrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
 
 
 class TestCapsules:
@@ -221,7 +221,8 @@ class TestAuthModes:
         with WrennClient(api_key="wrn_test1234567890abcdef12345678") as c:
             assert c._http.headers["X-API-Key"] == "wrn_test1234567890abcdef12345678"
 
-    def test_no_auth_raises(self):
+    def test_no_auth_raises(self, monkeypatch):
+        monkeypatch.delenv("WRENN_API_KEY", raising=False)
         with pytest.raises(ValueError, match="No API key"):
             WrennClient()
 

tests/test_filesystem_pty.py

@@ -23,7 +23,7 @@ def _make_capsule(cap_id: str = "cl-abc") -> Capsule:
     respx.post(f"{BASE}/v1/capsules").respond(
         201, json={"id": cap_id, "status": "running"}
     )
-    return Capsule(api_key="wrn_test1234567890abcdef12345678")
+    return Capsule(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
 
 
 class TestFilesRead:
@@ -311,12 +311,14 @@ class TestPtySessionIteration:
         ws.receive_text.side_effect = messages
         session = PtySession(ws, "cl-abc")
         events = list(session)
-        assert len(events) == 2
+        assert len(events) == 3
         assert events[0].type == PtyEventType.started
         assert session.tag == "pty-abc12345"
         assert session.pid == 1
         assert events[1].type == PtyEventType.output
         assert events[1].data == b"hello"
+        assert events[2].type == PtyEventType.exit
+        assert events[2].exit_code == 0
 
     def test_iter_stops_on_fatal_error(self):
         ws = MagicMock()
@@ -461,10 +463,11 @@ class TestAsyncPtySession:
         events = []
         async for event in session:
             events.append(event)
-        assert len(events) == 2
+        assert len(events) == 3
         assert events[0].type == PtyEventType.started
         assert session.tag == "pty-xyz"
         assert session.pid == 5
+        assert events[2].type == PtyEventType.exit
 
 
 class TestExports:

tests/test_git.py

@@ -73,7 +73,7 @@ def _make_git(respx_mock=None) -> Git:
     """Create a Git instance bound to a test capsule."""
     from wrenn.client import WrennClient
 
-    client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+    client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
     return Git(CAPSULE_ID, client.http)
 
 
@@ -81,7 +81,7 @@ def _make_async_git() -> AsyncGit:
     """Create an AsyncGit instance bound to a test capsule."""
     from wrenn.client import AsyncWrennClient
 
-    client = AsyncWrennClient(api_key="wrn_test1234567890abcdef12345678")
+    client = AsyncWrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
     return AsyncGit(CAPSULE_ID, client.http)
 
 
@@ -926,7 +926,7 @@ class TestCapsuleWiring:
         respx.post(f"{BASE}/v1/capsules").respond(
             201, json={"id": "cl-1", "status": "pending"}
         )
-        cap = Capsule(api_key="wrn_test1234567890abcdef12345678")
+        cap = Capsule(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         assert hasattr(cap, "git")
         assert isinstance(cap.git, Git)
 
@@ -1017,7 +1017,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json=_exec_response(stdout="3\n"))
@@ -1031,7 +1031,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json=_exec_response())
@@ -1045,7 +1045,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json=_exec_response())
@@ -1059,7 +1059,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json=_exec_response())
@@ -1073,7 +1073,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json=_exec_response())
@@ -1089,7 +1089,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json=_exec_response())
@@ -1119,7 +1119,7 @@ class TestCommandPayloadWrapping:
         from wrenn.client import WrennClient
         from wrenn.commands import Commands
 
-        client = WrennClient(api_key="wrn_test1234567890abcdef12345678")
+        client = WrennClient(api_key="wrn_test1234567890abcdef12345678", base_url=BASE)
         commands = Commands(CAPSULE_ID, client.http)
 
         route = respx.post(EXEC_URL).respond(200, json={"pid": 42, "tag": "bg-1"})

tests/test_integration.py

@@ -15,6 +15,17 @@ pytestmark = pytest.mark.integration
 _env_loaded = False
 
 
+def _wait_for_pid_dead(capsule: Capsule, pid: int, timeout: float = 5.0) -> bool:
+    deadline = time.monotonic() + timeout
+    while time.monotonic() < deadline:
+        result = capsule.commands.run(f"ps -p {pid} -o stat= 2>/dev/null || true")
+        state = result.stdout.strip()
+        if not state or state.startswith("Z"):
+            return True
+        time.sleep(0.2)
+    return False
+
+
 def _ensure_env() -> None:
     global _env_loaded
     if _env_loaded:
@@ -218,11 +229,7 @@ class TestCommands:
     def test_kill_process(self):
         handle = self.capsule.commands.run("sleep 30", background=True)
         self.capsule.commands.kill(handle.pid)
-        time.sleep(0.5)
+        assert _wait_for_pid_dead(self.capsule, handle.pid)
-
-        processes = self.capsule.commands.list()
-        pids = [p.pid for p in processes]
-        assert handle.pid not in pids
 
     def test_run_duration_ms(self):
         result = self.capsule.commands.run("sleep 1")

uv.lock

@@ -1,5 +1,5 @@
 version = 1
-revision = 3
+revision = 2
 requires-python = ">=3.13"
 resolution-markers = [
     "python_full_version >= '3.14'",