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Reading a new release v2.1.251 Analysing changes · 2/5 Deeper second pass · 4/5 agents 427 findings $12.75 so far

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.197

Explicit Error for Missing Bedrock Fallback ID

What

The function that resolves default 3rd-party model IDs now throws a descriptive error if a model tier is configured with bedrock: null, instead of silently passing null downstream.

Details
  • Previous behavior: null was passed as the Bedrock fallback ID, which could produce cryptic downstream failures
  • New behavior: immediately throws "A DEFAULT_3P_*_KEY points at a model config with bedrock: null — Bedrock setup has no fallback id for that tier"
  • This surfaces misconfiguration at the resolution point rather than at API call time
Evidence

Error message (search for "A DEFAULT_3P_*_KEY points at a model config with bedrock: null")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.197 →