Source Intelligence

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.

All of v2.1.225 Home All releases olderv2.1.224 v2.1.226newer

REPL sampling helpers report validation errors as progress instead of failing silently

You'll notice
Useful2 Signal0
Elsewhere

Bad arguments to the in-REPL sampling helpers now show a visible error instead of vanishing.

What

The in-REPL haiku, opus, sonnet and fable sampling helpers emit their start progress event before validating arguments, so bad input shows up as a visible error rather than a throw with nothing recorded.

Details
  • "prompt must be a string" and "schema must be an object" now arrive as a repl_tool_call progress event with phase "error"
  • a non-string prompt is recorded in progress as an assembled placeholder naming its typeof
Evidence

schema must be JSON-serializable

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

See this entry in the whole of v2.1.225 →