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40 lines
2.1 KiB
Markdown
40 lines
2.1 KiB
Markdown
# Anthropic Provider Shape
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Last updated: dev@e71f8ce | 2026-08-25
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## Scope
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Canonical placeholder vendor ID `anthropic`; Anthropic Messages runtime
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adapter in `src/llm_core.py`. There is no dedicated Anthropic capability-reader
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module; explicit/auto-detected Anthropic payloads use the generic identity-only
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reader.
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## Catalog Shape
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`GET /v1/models` returns `data[]` model resources with `id`, `type: model`,
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`display_name`, and `created_at`, plus pagination metadata. These fields prove
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identity/availability only. Do not assume all listed Claude models share
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vision, tools, reasoning, sampling, or context limits.
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## Request And Response Shape
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Native Messages uses a top-level `system`, alternating `messages`, content
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blocks, `tools[].input_schema`, `tool_use` assistant blocks, and `tool_result`
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user blocks. Text, thinking, signatures, server-tool blocks, and tool calls are
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typed content rather than OpenAI roles/fields. Preserve block IDs/signatures
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needed for continuation.
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Sampling and thinking support can be version/model specific. The Opus 4.7+ sampling omission is a model-scoped runtime observation, not an Anthropic-wide rule. Runtime version parsing accepts explicit major/minor IDs and later major-only IDs such as `claude-opus-5`, treats a missing minor as `.0`, caps both components so date stamps cannot be misread as versions, and keeps legacy Claude 3 Opus sampling intact. Anthropic-compatible proxies are Anthropic dialect only when configured or their exact payload/endpoint shape proves it (#3110).
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## Fallback And Safety
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Runtime and canonical reader detection use label-bounded Anthropic host matching or an explicit endpoint kind. A provider using Anthropic Messages through another host must be explicit. Identity-only model cards remain unknown.
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## Current Gaps
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- The public model list does not provide per-model canonical capability data.
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- There is no dedicated Anthropic canonical reader; only `id`, `name`, or
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`model` identity survives generic normalization.
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- Runtime model-version parsing needs structured identity before a later
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consumer can centralize sampling exceptions without another name matcher.
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