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 # Phase 2: Anthropic Provider
 
+**Status: complete.** Anthropic Messages API streams end-to-end alongside the phase-1 OpenAI provider; the Receiver callback sequence is identical across both; system prompts extract to the top-level field; thinking blocks round-trip via captured `signature` deltas. Refinements that diverged from the original plan: file/type names use the explicit dialect (`provider_anthropic_messages`, `AnthropicMessagesConfig`) to leave room for `openai_responses` and future Anthropic shapes; `Config` is a tagged union keyed by `APIStyle` rather than separate types at call sites; concrete provider types are internal — callers construct via `provider.Provider.init(allocator, io, config)`. Wire-level gotchas worth remembering: both providers send `accept-encoding: identity` because gzip buffers small SSE frames and defeats streaming; the read loop uses `readVec` rather than `readSliceShort` because the latter fills its buffer before returning, which also defeats streaming. Tool use / tool result blocks remain stubbed for phase 3+.
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 ## Goal
 
 Add Anthropic as a second provider, validating that the Provider abstraction and internal conversation model are genuinely provider-agnostic — not just OpenAI in disguise.