Add Python SDK public API and examples

Co-authored-by: Codex <noreply@openai.com>

sdk/python/examples/10_error_handling_and_retry/async.py

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+import sys
+from pathlib import Path
+
+_EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
+if str(_EXAMPLES_ROOT) not in sys.path:
+    sys.path.insert(0, str(_EXAMPLES_ROOT))
+
+from _bootstrap import ensure_local_sdk_src, runtime_config
+
+ensure_local_sdk_src()
+
+import asyncio
+import random
+from collections.abc import Awaitable, Callable
+from typing import TypeVar
+
+from codex_app_server import (
+    AsyncCodex,
+    JsonRpcError,
+    ServerBusyError,
+    TextInput,
+    TurnStatus,
+    is_retryable_error,
+)
+
+ResultT = TypeVar("ResultT")
+
+
+async def retry_on_overload_async(
+    op: Callable[[], Awaitable[ResultT]],
+    *,
+    max_attempts: int = 3,
+    initial_delay_s: float = 0.25,
+    max_delay_s: float = 2.0,
+    jitter_ratio: float = 0.2,
+) -> ResultT:
+    if max_attempts < 1:
+        raise ValueError("max_attempts must be >= 1")
+
+    delay = initial_delay_s
+    attempt = 0
+    while True:
+        attempt += 1
+        try:
+            return await op()
+        except Exception as exc:  # noqa: BLE001
+            if attempt >= max_attempts or not is_retryable_error(exc):
+                raise
+            jitter = delay * jitter_ratio
+            sleep_for = min(max_delay_s, delay) + random.uniform(-jitter, jitter)
+            if sleep_for > 0:
+                await asyncio.sleep(sleep_for)
+            delay = min(max_delay_s, delay * 2)
+
+
+async def main() -> None:
+    async with AsyncCodex(config=runtime_config()) as codex:
+        thread = await codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
+
+        try:
+            result = await retry_on_overload_async(
+                _run_turn(thread, "Summarize retry best practices in 3 bullets."),
+                max_attempts=3,
+                initial_delay_s=0.25,
+                max_delay_s=2.0,
+            )
+        except ServerBusyError as exc:
+            print("Server overloaded after retries:", exc.message)
+            print("Text:")
+            return
+        except JsonRpcError as exc:
+            print(f"JSON-RPC error {exc.code}: {exc.message}")
+            print("Text:")
+            return
+
+        if result.status == TurnStatus.failed:
+            print("Turn failed:", result.error)
+
+        print("Text:", result.text)
+
+
+def _run_turn(thread, prompt: str):
+    async def _inner():
+        turn = await thread.turn(TextInput(prompt))
+        return await turn.run()
+
+    return _inner
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

sdk/python/examples/10_error_handling_and_retry/sync.py

@@ -0,0 +1,40 @@
+import sys
+from pathlib import Path
+
+_EXAMPLES_ROOT = Path(__file__).resolve().parents[1]
+if str(_EXAMPLES_ROOT) not in sys.path:
+    sys.path.insert(0, str(_EXAMPLES_ROOT))
+
+from _bootstrap import ensure_local_sdk_src, runtime_config
+
+ensure_local_sdk_src()
+
+from codex_app_server import (
+    Codex,
+    JsonRpcError,
+    ServerBusyError,
+    TextInput,
+    TurnStatus,
+    retry_on_overload,
+)
+
+with Codex(config=runtime_config()) as codex:
+    thread = codex.thread_start(model="gpt-5", config={"model_reasoning_effort": "high"})
+
+    try:
+        result = retry_on_overload(
+            lambda: thread.turn(TextInput("Summarize retry best practices in 3 bullets.")).run(),
+            max_attempts=3,
+            initial_delay_s=0.25,
+            max_delay_s=2.0,
+        )
+    except ServerBusyError as exc:
+        print("Server overloaded after retries:", exc.message)
+        print("Text:")
+    except JsonRpcError as exc:
+        print(f"JSON-RPC error {exc.code}: {exc.message}")
+        print("Text:")
+    else:
+        if result.status == TurnStatus.failed:
+            print("Turn failed:", result.error)
+        print("Text:", result.text)