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`src/provider/anthropic.rs` — `AnthropicClient` [feature: anthropic]

The Messages API client — shared by the Z.ai profile and Bedrock’s native path. (~3,640 lines with tests.)

Key items

  • from_env() + builder including with_max_tokens (default 8192, 0 rejected at build); headers x-api-key + anthropic-version: 2023-06-01.
  • RequestBodySpec + build_request_body — system always a top-level field (folded from inline system messages, "" when empty); tool_use/tool_result blocks; is_error: true travels on the wire.
  • The shared StreamEmitter (reused by Bedrock): typed SSE events; usage latched at message_start, max-merged at message_delta; thinking/redacted-thinking lanes; message_stop is the terminal event.
  • Forced-tool response_format synthesis + the two up-front rejections (strict formats, grammar constraints).
  • pub(super) DEFAULT_MAX_TOKENS — shared with Bedrock.

Behavior notes

  • Tool-input deltas carry no index — the emitter remembers the open block from content_block_start.
  • signature_delta ignored; late events after message_stop swallowed (desync guard); a late error after a clean stop is dropped.
  • Non-streaming replies skip thinking blocks entirely (reasoning is stream-only); images dropped.

Deep dive: Anthropic.