v2.1.271 system prompt / Claude Code source intelligence

Claude Code, interactive mode Agent SDK, print mode Claude Code, interactive mode, seeded with flags-account Claude Code, interactive mode, seeded with flags-anon Agent SDK, print mode, seeded with flags-account Agent SDK, print mode, seeded with flags-anon

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

What changed since the previous capture

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

PromptReachMovedThe first line that changed

System prompt, Opus 4.8 77 ln, and 1 other copy of it moved the same way 4 of 27 arms +1−1 For actions that are hard to reverse or outward-facing, confirm first unless durably authorized or explicitly told to proceed without asking; approval...

SendMessage 33 ln all 27 arms +1−1 A listed peer is alive and will process your message; messages enqueue and drain at the receiver's next tool round (its `ListAgents` row says whether...

Workflow 35 ln all 27 arms +1−1 This session has the default workflow size guideline: medium — keep workflows under 15 agents. This is a guideline, not a hard limit — follow it unles...

The families in this capture

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

#FamilyHeadReachCopiesOpens with

1 Haiku family, 12 model strings 218 ln · 27.4k 17 of 27 3 copies You are an interactive agent that helps users with software engineering tasks.

2 claude-fable-5 79 ln · 10.2k 2 of 27 2 copies You are an interactive agent that helps users with software engineering tasks.

3 Opus family, 6 model strings 70 ln · 9.3k 6 of 27 1 copy You are an interactive agent that helps users with software engineering tasks.

4 default 56 ln · 5.9k 2 of 27 2 copies You are an interactive agent that helps users with software engineering tasks.

Tool descriptions

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

All 28 tool descriptions →

ToolDescriptionCopiesMoved

Agent 1,811 chars 2 ○same

AskUserQuestion 1,786 chars 2 ○same

Bash 1,229 chars 2 ○same

CronCreate 2,924 chars 1 ○same

CronDelete 167 chars 1 ○same

CronList 106 chars 1 ○same

Edit 360 chars 2 ○same

EnterPlanMode 4,011 chars 1 ○same

EnterWorktree 3,220 chars 1 ○same

ExitPlanMode 1,849 chars 1 ○same

ExitWorktree 1,923 chars 1 ○same

ListAgents 777 chars 1 ○same

NotebookEdit 619 chars 1 ○same

Read 790 chars 2 ○same

ReportFindings 574 chars 1 ○same

ScheduleWakeup 3,396 chars 1 ○same

SendMessage 3,933 chars 1 ◆moved

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 469 chars 2 ○same

WebSearch 312 chars 2 ○same

Workflow 3,480 chars 1 ◆moved

Write 240 chars 2 ○same

Read the whole system prompt →

v2.1.271, what moved

What changed since the previous capture

The families in this capture

Tool descriptions