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
v2.1.250 system prompt
No change to the system prompt since v2.1.248.
Agent SDK, print mode, seeded with flags-account27 model strings27 toolsreleased captured Markdown
This arm was captured with the sandbox seeded from flags-account, this account's own GrowthBook payload, seeded into the sandbox .claude.json. 561 flags from data/flags/snapshots/flags-20260827T223537Z.json. What a seeded capture does and does not tell you.
Nothing in the system prompt or in any of the 27 tool descriptions moved between v2.1.248 and v2.1.250.
The full text
The whole documents, one page each, exactly as they were sent.
