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codex/codex-rs/codex-api/README.md
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pakrym-oai c9253c4977 Send base instructions as Responses input messages (#51156)
## What changed

Move base instructions from the top-level `instructions` field into a prefixed `developer` message in `input` for standard Responses requests, matching Responses Lite. Remove the field from HTTP and WebSocket request types and assign instruction messages stable IDs derived from the thread and instruction text.

## Testing

Extend standard and Responses Lite tests to cover instruction message serialization, stable IDs, and resume consistency. Update WebSocket tests to verify that changed instructions trigger a full request without `previous_response_id`.

GitOrigin-RevId: e2de4b8e30a9339377fac133ceda981abd1a112b
2026-10-05 18:52:51 +00:00

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# codex-api
Typed clients for Codex/OpenAI APIs built on top of the generic transport in `codex-client`.
- Hosts the request/response models and request builders for Responses and related Codex APIs.
- Owns provider configuration (base URLs, headers, query params), auth header injection, retry tuning, and stream idle settings.
- Parses SSE streams into `ResponseEvent`/`ResponseStream`, including rate-limit snapshots and API-specific error mapping.
- Serves as the wire-level layer consumed by `codex-core`; higher layers handle auth refresh and business logic.
## Core interface
The public interface of this crate is intentionally small and uniform:
- **Responses endpoint**
- Input:
- `ResponsesApiRequest` for the request body (`model`, `input`, `tools`, `parallel_tool_calls`, reasoning/text controls).
- `ResponsesOptions` for transport/header concerns (`conversation_id`, `session_source`, `extra_headers`, `compression`, `turn_state`).
- Output: a `ResponseStream` of `ResponseEvent` (both re-exported from `common`).
- **Memory summarize endpoint**
- Input: `MemorySummarizeInput` (re-exported as `codex_api::MemorySummarizeInput`):
- `model: String`.
- `raw_memories: Vec<RawMemory>` (serialized as `traces` for wire compatibility).
- `RawMemory` includes `id`, `metadata.source_path`, and normalized `items`.
- `reasoning: Option<Reasoning>`.
- Output: `Vec<MemorySummarizeOutput>`.
- `MemoriesClient::summarize_input(&MemorySummarizeInput, extra_headers)` wraps JSON encoding and retry/telemetry wiring.
All HTTP details (URLs, headers, retry/backoff policies, SSE framing) are encapsulated in `codex-api` and `codex-client`. Callers construct prompts/inputs using protocol types and work with typed streams of `ResponseEvent` or other endpoint-specific response values.