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whit3rabbitandClaude Opus 4.6
f2e3ed15f4
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>
47 lines
2.0 KiB
Markdown
47 lines
2.0 KiB
Markdown
# Tool Calling Differences: Anthropic vs OpenAI
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## Tool Definitions
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| Aspect | Anthropic | OpenAI |
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|---|---|---|
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| Wrapper type | None (flat) | `{type: "function", function: {...}}` |
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| Schema field | `input_schema` (JSON Schema) | `function.parameters` (JSON Schema) |
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| Description | `description` (optional) | `function.description` (optional) |
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| Name | `name` | `function.name` |
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## Tool Use in Responses
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| Aspect | Anthropic | OpenAI |
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| Location | Content blocks in assistant message | `tool_calls[]` in assistant message |
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| ID field | `tool_use.id` | `tool_call.id` |
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| Name | `tool_use.name` | `tool_call.function.name` |
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| Arguments | `tool_use.input` (JSON object) | `tool_call.function.arguments` (JSON string) |
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## Tool Results
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| Aspect | Anthropic | OpenAI |
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| Location | Content block in user message | Separate `tool` role message |
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| Reference | `tool_result.tool_use_id` | `tool_call_id` in message |
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| Error flag | `is_error: true` | No standard error flag |
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| Content | String or content blocks | String |
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## Streaming Tool Calls
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| Aspect | Anthropic | OpenAI |
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| Start event | `content_block_start` with tool_use block | Chunk delta with `tool_calls[].id` |
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| Argument deltas | `input_json_delta` (partial JSON) | `tool_calls[].function.arguments` (fragments) |
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| End event | `content_block_stop` | `finish_reason: "tool_calls"` |
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## ID Strategy
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This proxy uses a stateless ID bridge: the OpenAI `tool_call.id` is used directly as the Anthropic `tool_use.id`. This avoids server-side session storage and allows the client to reference tool calls across turns without the proxy maintaining state.
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## Known Limitations
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- OpenAI `arguments` may contain invalid JSON (partial deltas, truncated output). The proxy uses lenient parsing that wraps unparseable strings as `Value::String`.
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- Anthropic supports `is_error` on tool results; OpenAI has no equivalent. The proxy prepends "Error: " to error content.
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- Parallel tool use control (`disable_parallel_tool_use` in Anthropic) has no direct OpenAI equivalent.
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