Source Intelligence
Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.251 Feeds RSS JSON llms.txt
Reading a new release v2.1.251 Analysing changes · 2/5 Writing the entries · 2/4 steps 470 findings $18.91 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.

Prompt capture

v2.1.137 system prompt

No change to the system prompt since v2.1.136.

Agent SDK, print mode 27 model strings 23 tools released captured Markdown

Nothing in the system prompt or in any of the 23 tool descriptions moved between v2.1.136 and v2.1.137.

The full text

The whole documents, one page each, exactly as they were sent.