# Claude Code v2.1.265: system prompt

> No change to the system prompt since v2.1.263. Compared against v2.1.263.

Web version: https://changelogs.core-directive.com/prompts/2.1.265?surface=reminder-skill-run

## What this version holds
- model strings captured: 1
- tool descriptions: 21
- compared against: v2.1.263
- 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 1 arms.

_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 5.15.0-190-generic
+ - OS Version: Linux 5.15.0-191-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 5.1: 'claude-fable-5-1', 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/2.1.265/tools/Agent.txt?surface=reminder-skill-run
- Bash: https://changelogs.core-directive.com/prompts/2.1.265/tools/Bash.txt?surface=reminder-skill-run
- CronCreate: https://changelogs.core-directive.com/prompts/2.1.265/tools/CronCreate.txt?surface=reminder-skill-run
- CronDelete: https://changelogs.core-directive.com/prompts/2.1.265/tools/CronDelete.txt?surface=reminder-skill-run
- CronList: https://changelogs.core-directive.com/prompts/2.1.265/tools/CronList.txt?surface=reminder-skill-run
- Edit: https://changelogs.core-directive.com/prompts/2.1.265/tools/Edit.txt?surface=reminder-skill-run
- EnterWorktree: https://changelogs.core-directive.com/prompts/2.1.265/tools/EnterWorktree.txt?surface=reminder-skill-run
- ExitWorktree: https://changelogs.core-directive.com/prompts/2.1.265/tools/ExitWorktree.txt?surface=reminder-skill-run
- ListAgents: https://changelogs.core-directive.com/prompts/2.1.265/tools/ListAgents.txt?surface=reminder-skill-run
- NotebookEdit: https://changelogs.core-directive.com/prompts/2.1.265/tools/NotebookEdit.txt?surface=reminder-skill-run
- Read: https://changelogs.core-directive.com/prompts/2.1.265/tools/Read.txt?surface=reminder-skill-run
- ReportFindings: https://changelogs.core-directive.com/prompts/2.1.265/tools/ReportFindings.txt?surface=reminder-skill-run
- ScheduleWakeup: https://changelogs.core-directive.com/prompts/2.1.265/tools/ScheduleWakeup.txt?surface=reminder-skill-run
- SendMessage: https://changelogs.core-directive.com/prompts/2.1.265/tools/SendMessage.txt?surface=reminder-skill-run
- Skill: https://changelogs.core-directive.com/prompts/2.1.265/tools/Skill.txt?surface=reminder-skill-run
- TaskOutput: https://changelogs.core-directive.com/prompts/2.1.265/tools/TaskOutput.txt?surface=reminder-skill-run
- TaskStop: https://changelogs.core-directive.com/prompts/2.1.265/tools/TaskStop.txt?surface=reminder-skill-run
- WebFetch: https://changelogs.core-directive.com/prompts/2.1.265/tools/WebFetch.txt?surface=reminder-skill-run
- WebSearch: https://changelogs.core-directive.com/prompts/2.1.265/tools/WebSearch.txt?surface=reminder-skill-run
- Workflow: https://changelogs.core-directive.com/prompts/2.1.265/tools/Workflow.txt?surface=reminder-skill-run
- Write: https://changelogs.core-directive.com/prompts/2.1.265/tools/Write.txt?surface=reminder-skill-run

## Full text
- system prompt: https://changelogs.core-directive.com/prompts/2.1.265/system.txt?surface=reminder-skill-run