2026-03-07 Stabilize experimental python SDK foundation

Description:
- pin datamodel-code-generator to an exact version and invoke it through the active interpreter
- make generate_types own the maintained generated surfaces and regenerate committed artifacts
- make sdk/python tests hermetic and regeneration checks idempotent

sdk/python/docs/faq.md

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+# FAQ
+
+## Thread vs turn
+
+- A `Thread` is conversation state.
+- A `Turn` is one model execution inside that thread.
+- Multi-turn chat means multiple turns on the same `Thread`.
+
+## `run()` vs `stream()`
+
+- `Turn.run()` is the easiest path. It consumes events until completion and returns `TurnResult`.
+- `Turn.stream()` yields raw notifications (`Notification`) so you can react event-by-event.
+
+Choose `run()` for most apps. Choose `stream()` for progress UIs, custom timeout logic, or custom parsing.
+
+## Sync vs async clients
+
+- `Codex` is the minimal sync SDK and best default.
+- `AsyncAppServerClient` wraps the sync transport with `asyncio.to_thread(...)` for async-friendly call sites.
+
+If your app is not already async, stay with `Codex`.
+
+## `thread(...)` vs `thread_resume(...)`
+
+- `codex.thread(thread_id)` only binds a local helper to an existing thread ID.
+- `codex.thread_resume(thread_id, ...)` performs a `thread/resume` RPC and can apply overrides (model, instructions, sandbox, etc.).
+
+Use `thread(...)` for simple continuation. Use `thread_resume(...)` when you need explicit resume semantics or override fields.
+
+## Why does constructor fail?
+
+`Codex()` is eager: it starts transport and calls `initialize` in `__init__`.
+
+Common causes:
+
+- bundled runtime binary missing for your OS/arch under `src/codex_app_server/bin/*`
+- local auth/session is missing
+- incompatible/old app-server
+
+Maintainers can refresh bundled binaries with:
+
+```bash
+cd sdk/python
+python scripts/update_sdk_artifacts.py --channel stable --bundle-all-platforms
+```
+
+## Why does a turn "hang"?
+
+A turn is complete only when `turn/completed` arrives for that turn ID.
+
+- `run()` waits for this automatically.
+- With `stream()`, make sure you keep consuming notifications until completion.
+
+## How do I retry safely?
+
+Use `retry_on_overload(...)` for transient overload failures (`ServerBusyError`).
+
+Do not blindly retry all errors. For `InvalidParamsError` or `MethodNotFoundError`, fix inputs/version compatibility instead.
+
+## Common pitfalls
+
+- Starting a new thread for every prompt when you wanted continuity.
+- Forgetting to `close()` (or not using `with Codex() as codex:`).
+- Ignoring `TurnResult.status` and `TurnResult.error`.
+- Mixing SDK input classes with raw dicts incorrectly in minimal API paths.

sdk/python/docs/getting-started.md

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+# Getting Started
+
+This is the fastest path from install to a multi-turn thread using the minimal SDK surface.
+
+## 1) Install
+
+From repo root:
+
+```bash
+cd sdk/python
+python -m pip install -e .
+```
+
+Requirements:
+
+- Python `>=3.10`
+- bundled runtime binary for your platform (shipped in package)
+- Local Codex auth/session configured
+
+## 2) Run your first turn
+
+```python
+from codex_app_server import Codex, TextInput
+
+with Codex() as codex:
+    print("Server:", codex.metadata.server_name, codex.metadata.server_version)
+
+    thread = codex.thread_start(model="gpt-5")
+    result = thread.turn(TextInput("Say hello in one sentence.")).run()
+
+    print("Thread:", result.thread_id)
+    print("Turn:", result.turn_id)
+    print("Status:", result.status)
+    print("Text:", result.text)
+```
+
+What happened:
+
+- `Codex()` started and initialized `codex app-server`.
+- `thread_start(...)` created a thread.
+- `turn(...).run()` consumed events until `turn/completed` and returned a `TurnResult`.
+
+## 3) Continue the same thread (multi-turn)
+
+```python
+from codex_app_server import Codex, TextInput
+
+with Codex() as codex:
+    thread = codex.thread_start(model="gpt-5")
+
+    first = thread.turn(TextInput("Summarize Rust ownership in 2 bullets.")).run()
+    second = thread.turn(TextInput("Now explain it to a Python developer.")).run()
+
+    print("first:", first.text)
+    print("second:", second.text)
+```
+
+## 4) Resume an existing thread
+
+```python
+from codex_app_server import Codex, TextInput
+
+THREAD_ID = "thr_123"  # replace with a real id
+
+with Codex() as codex:
+    thread = codex.thread(THREAD_ID)
+    result = thread.turn(TextInput("Continue where we left off.")).run()
+    print(result.text)
+```
+
+## 5) Next stops
+
+- API surface and signatures: `docs/api-reference.md`
+- Common decisions/pitfalls: `docs/faq.md`
+- End-to-end runnable examples: `examples/README.md`