2.1 KiB
Anthropic Provider Shape
Last updated: dev@e71f8ce | 2026-08-25
Scope
Canonical placeholder vendor ID anthropic; Anthropic Messages runtime
adapter in src/llm_core.py. There is no dedicated Anthropic capability-reader
module; explicit/auto-detected Anthropic payloads use the generic identity-only
reader.
Catalog Shape
GET /v1/models returns data[] model resources with id, type: model,
display_name, and created_at, plus pagination metadata. These fields prove
identity/availability only. Do not assume all listed Claude models share
vision, tools, reasoning, sampling, or context limits.
Request And Response Shape
Native Messages uses a top-level system, alternating messages, content
blocks, tools[].input_schema, tool_use assistant blocks, and tool_result
user blocks. Text, thinking, signatures, server-tool blocks, and tool calls are
typed content rather than OpenAI roles/fields. Preserve block IDs/signatures
needed for continuation.
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).
Fallback And Safety
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.
Current Gaps
- The public model list does not provide per-model canonical capability data.
- There is no dedicated Anthropic canonical reader; only
id,name, ormodelidentity survives generic normalization. - Runtime model-version parsing needs structured identity before a later consumer can centralize sampling exceptions without another name matcher.