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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

v2.1.240 system prompt

No change to the system prompt since v2.1.239. Compared against v2.1.239.

Claude Code, interactive mode 27 model strings 27 tools released captured Markdown

System prompt +1 −1 of 79 lines

This edit reached all 27 arms

The same edit landed in 20 other copies of this prompt, which differ from this one only in text interpolated per model.

from line 49 from the capture machine, not counted 
  - Is a git repository: false
  - Platform: linux
  - Shell: unknown
- - OS Version: Linux 5.15.0-187-generic
+ - OS Version: Linux 5.15.0-190-generic
  - You are powered by the model named Opus 5 (1M context). The exact model ID is claude-opus-5[1m].
  - Assistant knowledge cutoff is May 2026.
  - The most recent Claude models are the Claude 5 family and Haiku 4.5. Model IDs — Fable 5: 'claude-fable-5', Opus 5: 'claude-opus-5', Sonnet 5: 'claude-sonnet-5', Haiku 4.5: 'claude-haiku-4-5-20251001'. When building AI applications, default to the latest and most capable Claude models.

The full text

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

Read the whole system prompt → All 27 tool descriptions →