# Claude Code v2.1.240: system prompt

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

Web version: https://changelogs.core-directive.com/prompts/2.1.240?arm=sdk-cli

## What this version holds
- model strings captured: 27
- tool descriptions: 24
- compared against: v2.1.239
- system prompt edits: 1
- widest system prompt edit: +1/-1 lines
- tool descriptions changed: 0

## What moved

### System prompt (+1/-1 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.

_The lines below describe the capture machine, not the product, and are not counted._

```diff
@@ from line 48 @@
  - 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.
```

## Tool descriptions
- Agent: https://changelogs.core-directive.com/prompts/2.1.240/tools/Agent.txt?arm=sdk-cli
- Bash: https://changelogs.core-directive.com/prompts/2.1.240/tools/Bash.txt?arm=sdk-cli
- CronCreate: https://changelogs.core-directive.com/prompts/2.1.240/tools/CronCreate.txt?arm=sdk-cli
- CronDelete: https://changelogs.core-directive.com/prompts/2.1.240/tools/CronDelete.txt?arm=sdk-cli
- CronList: https://changelogs.core-directive.com/prompts/2.1.240/tools/CronList.txt?arm=sdk-cli
- Edit: https://changelogs.core-directive.com/prompts/2.1.240/tools/Edit.txt?arm=sdk-cli
- EnterWorktree: https://changelogs.core-directive.com/prompts/2.1.240/tools/EnterWorktree.txt?arm=sdk-cli
- ExitWorktree: https://changelogs.core-directive.com/prompts/2.1.240/tools/ExitWorktree.txt?arm=sdk-cli
- NotebookEdit: https://changelogs.core-directive.com/prompts/2.1.240/tools/NotebookEdit.txt?arm=sdk-cli
- Read: https://changelogs.core-directive.com/prompts/2.1.240/tools/Read.txt?arm=sdk-cli
- ReportFindings: https://changelogs.core-directive.com/prompts/2.1.240/tools/ReportFindings.txt?arm=sdk-cli
- ScheduleWakeup: https://changelogs.core-directive.com/prompts/2.1.240/tools/ScheduleWakeup.txt?arm=sdk-cli
- SendMessage: https://changelogs.core-directive.com/prompts/2.1.240/tools/SendMessage.txt?arm=sdk-cli
- Skill: https://changelogs.core-directive.com/prompts/2.1.240/tools/Skill.txt?arm=sdk-cli
- TaskCreate: https://changelogs.core-directive.com/prompts/2.1.240/tools/TaskCreate.txt?arm=sdk-cli
- TaskGet: https://changelogs.core-directive.com/prompts/2.1.240/tools/TaskGet.txt?arm=sdk-cli
- TaskList: https://changelogs.core-directive.com/prompts/2.1.240/tools/TaskList.txt?arm=sdk-cli
- TaskOutput: https://changelogs.core-directive.com/prompts/2.1.240/tools/TaskOutput.txt?arm=sdk-cli
- TaskStop: https://changelogs.core-directive.com/prompts/2.1.240/tools/TaskStop.txt?arm=sdk-cli
- TaskUpdate: https://changelogs.core-directive.com/prompts/2.1.240/tools/TaskUpdate.txt?arm=sdk-cli
- WebFetch: https://changelogs.core-directive.com/prompts/2.1.240/tools/WebFetch.txt?arm=sdk-cli
- WebSearch: https://changelogs.core-directive.com/prompts/2.1.240/tools/WebSearch.txt?arm=sdk-cli
- Workflow: https://changelogs.core-directive.com/prompts/2.1.240/tools/Workflow.txt?arm=sdk-cli
- Write: https://changelogs.core-directive.com/prompts/2.1.240/tools/Write.txt?arm=sdk-cli

## Full text
- system prompt: https://changelogs.core-directive.com/prompts/2.1.240/system.txt?arm=sdk-cli