Source Intelligence
Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

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

v2.1.235 system prompt

1 added and 0 removed, of 223 lines, in the prompt 17 of 27 arms receive. 3 other prompts also changed. Compared against v2.1.234.

The two arm counts on this page measure different things: 17 arms receive the prompt the headline is about, and the widest edit below reached 27, because the same changed lines sit in more than one prompt.

Agent SDK, print mode, seeded with flags-anon 27 model strings 27 tools released captured Markdown

This arm was captured with the sandbox seeded from flags-anon, the anonymous GrowthBook payload, seeded into the sandbox .claude.json. 514 flags from data/flags/snapshots/flags-20260818T185025Z.json. What a seeded capture does and does not tell you.

System prompt +2 −0 of 223 lines

This edit reached all 27 arms

The same edit landed in 2 other copies of this prompt, which differ from this one only in text interpolated per model.

from line 219
 
 # Context management
 When the conversation grows long, some or all of the current context is summarized; the summary, along with any remaining unsummarized context, is provided in the next context window so work can continue — you don't need to wrap up early or hand off mid-task.
+
+<total_tokens>15000000 tokens left</total_tokens>

The full text

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