v2.1.260 system prompt / Claude Code source intelligence

6 capture arms for this release, one page each, never diffed against each other

What changed since the previous capture

0 One line per document that moved, the system prompt and the tool descriptions in the same table.

PromptReachMovedThe first line that changed

Nothing in the system prompt or in any of the 25 tool descriptions moved between v2.1.259 and v2.1.260.

4 A family is one prompt and every model-interpolated copy of it, ranked by the model strings it reaches.

#FamilyHeadReachCopiesOpens with

1 Sonnet 5 family, 3 model strings 225 ln · 27.5k 17 of 27 15 copies You are an interactive agent that helps users with software engineering tasks.

2 claude-fable-5 86 ln · 10.4k 2 of 27 2 copies You are an interactive agent that helps users with software engineering tasks.

3 Opus family, 5 model strings 77 ln · 9.4k 6 of 27 2 copies You are an interactive agent that helps users with software engineering tasks.

4 Opus 4.8 63 ln · 6.1k 2 of 27 2 copies You are an interactive agent that helps users with software engineering tasks.

25 The text the model is given for each tool, on this arm.

ToolDescriptionCopiesMoved

Agent 1,434 chars 3 ○same

Bash 1,280 chars 19 ○same

CronCreate 2,924 chars 1 ○same

CronDelete 167 chars 1 ○same

CronList 106 chars 1 ○same

Edit 360 chars 2 ○same

EnterWorktree 3,220 chars 1 ○same

ExitWorktree 1,923 chars 1 ○same

ListAgents 777 chars 1 ○same

NotebookEdit 619 chars 1 ○same

Read 838 chars 2 ○same

ReportFindings 574 chars 1 ○same

ScheduleWakeup 3,396 chars 1 ○same

SendMessage 3,386 chars 1 ○same

Skill 1,417 chars 1 ○same

TaskCreate 2,146 chars 1 ○same

TaskGet 732 chars 1 ○same

TaskList 998 chars 1 ○same

TaskOutput 1,049 chars 1 ○same

TaskStop 378 chars 1 ○same

TaskUpdate 2,243 chars 1 ○same

WebFetch 374 chars 2 ○same

WebSearch 312 chars 2 ○same

Workflow 3,480 chars 1 ○same

Write 240 chars 2 ○same