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whit3rabbitandClaude Opus 4.6 f2e3ed15f4 Initial commit: Anthropic-to-OpenAI API translation proxy

Rust workspace with two crates:
- translator: pure, IO-free mapping between Anthropic Messages API and OpenAI Chat Completions
- proxy: axum HTTP server with auth, streaming SSE, retry/backoff, concurrency limits

169 tests passing (unit, golden fixture, integration).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-21 13:25:43 -05:00

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Anthropic API: Type Verification Notes

Verified Against

Anthropic Messages API documentation as referenced in PLAN.md.

MessageCreateRequest

Field	Type	Required	Implemented	Notes
model	string	Yes	Yes
max_tokens	u32	Yes	Yes
messages	Vec	Yes	Yes
system	Option	No	Yes	String or blocks
temperature	Option	No	Yes	Range 0..1
top_p	Option	No	Yes
stop_sequences	Option<Vec>	No	Yes
tools	Option<Vec>	No	Yes
tool_choice	Option	No	Yes	auto/any/none/tool
metadata	Option	No	Yes	user_id only
stream	Option	No	Yes
thinking	-	No	Not implemented	Extended thinking config

Content Blocks

Block Type	Implemented	Notes
text	Yes
image	Yes	base64 and URL sources
document	Yes	Converted to text note (no inline PDF in Chat Completions)
tool_use	Yes	id, name, input (JSON object)
tool_result	Yes	tool_use_id, content (string or blocks), is_error
thinking	No	Extended thinking not proxied

MessageResponse

Field	Implemented	Notes
id	Yes	Generated as msg_{uuid}
type	Yes	Always "message"
role	Yes	Always "assistant"
content	Yes	Vec
model	Yes	Echoed from request
stop_reason	Yes	end_turn, max_tokens, stop_sequence, tool_use
stop_sequence	Yes	Always null (not tracked from OpenAI)
usage	Yes	input_tokens, output_tokens

Error Types

All 8 error types implemented: invalid_request_error, authentication_error, permission_error, not_found_error, request_too_large, rate_limit_error, api_error, overloaded_error.

Streaming Events

All event types implemented: message_start, content_block_start, content_block_delta, content_block_stop, message_delta, message_stop, ping, error.

Delta types: text_delta, input_json_delta. Thinking_delta not implemented.

Known Gaps

Extended thinking (thinking config and thinking_delta events)
pause_turn stop reason (no OpenAI equivalent)
Prompt caching (cache_control on system blocks parsed but not utilized)
Beta Files API
Beta Skills API

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