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AGENTS.md

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+# 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)