atomr-infer-runtime-anthropic

Anthropic Messages API runtime. Same shape as atomr-infer-runtime-openai; per-provider differences live in wire.rs and error.rs.

What's different from OpenAI

• Auth header is x-api-key (not Authorization: Bearer).
• API version pinned via the anthropic-version header (AnthropicConfig::anthropic_version, defaults to 2023-06-01).
• SSE event types are richer: message_start, content_block_delta, message_delta, message_stop, ping, error. The runner translates each to the canonical TokenChunk shape.
• System messages are extracted into the top-level system field (Anthropic doesn't accept role: "system" inline).
• Vision input is a content block with type: "image" carrying base64 source data — fully supported via ContentPart::ImageBase64.
• Tool-use is round-tripped (input deltas surface as tool_call_delta).

Pricing

AnthropicPricing::published() covers Opus 4, Sonnet 4, 3.5 Sonnet, 3.5 Haiku, 3 Haiku. Operators override per deployment.

Quick start

use inference_runtime_anthropic::{AnthropicConfig, AnthropicRunner};
use inference_runtime_anthropic::config::SecretRef;

let cfg = AnthropicConfig::defaults(SecretRef::Env { name: "ANTHROPIC_API_KEY".into() });
let runner = AnthropicRunner::new(cfg, session_snapshot)?;