# Claude Code v2.1.268: system prompt > 0 added and 12 removed, of 26 lines, about 53 words, in the prompt all 1 arms receive. 3 of 18 tool descriptions changed. The appended system-reminder blocks moved: 9 lines added. Compared against v2.1.267. Web version: https://changelogs.core-directive.com/prompts/2.1.268?surface=subagent-general-purpose ## What this version holds - model strings captured: 1 - tool descriptions: 18 - compared against: v2.1.267 - system prompt edits: 1 - widest system prompt edit: +0/-12 lines - tool descriptions changed: 3 ## What moved ### System prompt (+0/-12 lines) This edit reached all 1 arms. ```diff @@ from line 23 @@ - Do not use a colon before tool calls. Text like "Let me read the file:" followed by a read tool call should just be "Let me read the file." with a period. - Do NOT Write report/summary/findings/analysis .md files. Return findings directly as your final assistant message — the parent agent reads your text output, not files you create. (Files written as input to another tool are fine; this note is about report files.) -Here is useful information about the environment you are running in: - -Working directory: /home/corpus/work -Is directory a git repo: No -Platform: linux -Shell: unknown -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. - 15000000 tokens left ``` ### Tool: Bash (+1/-4 lines) This edit reached all 1 arms. ```diff @@ from line 10 @@ - Interactive flags (`-i`, e.g. `git rebase -i`, `git add -i`) are not supported in this environment. - Use the `gh` CLI for GitHub operations (PRs, issues, API). - Commit or push only when the user asks. If on the default branch, branch first. -- End git commit messages with: -Co-Authored-By: Claude Opus 5 (1M context) -- End PR bodies with: -🤖 Generated with [Claude Code](https://claude.com/claude-code) +- End git commit messages and PR bodies with the attribution lines given in the conversation's system-reminder, when one is present. ``` ### Tool: Read (+1/-1 lines) This edit reached all 1 arms. ```diff @@ from line 2 @@ - `file_path` must be an absolute path. - Reads up to 2000 lines by default. -- You can optionally specify a line offset and limit (especially handy for long files), but it's recommended to read the whole file by not providing these parameters +- When you already know which part of the file you need, only read that part. This can be important for larger files. - Results are returned using cat -n format, with line numbers starting at 1 - Reads images (PNG, JPG, …) and presents them visually. Reads PDFs via the `pages` parameter (e.g. "1-5", max 20 pages/request; required for PDFs over 10 pages). Reads Jupyter notebooks (.ipynb) as cells with outputs. - Reading a directory, a missing file, or an empty file returns an error or system reminder rather than content. ``` ### Tool: WebFetch (+1/-0 lines) This edit reached all 1 arms. ```diff @@ from line 1 @@ Fetches a URL, converts the page to markdown, and answers `prompt` against it using a small fast model. - Fails on authenticated/private URLs — use an authenticated MCP tool or `gh` for those instead. +- Fails on localhost and other hostnames without a dot; for a local server, use curl via Bash. - HTTP is upgraded to HTTPS. Cross-host redirects are returned to you rather than followed; call again with the redirect URL. - Responses are cached for 15 minutes per URL. ``` ## Tool descriptions - Agent: https://changelogs.core-directive.com/prompts/2.1.268/tools/Agent.txt?surface=subagent-general-purpose - Bash (changed in this version): https://changelogs.core-directive.com/prompts/2.1.268/tools/Bash.txt?surface=subagent-general-purpose - CronCreate: https://changelogs.core-directive.com/prompts/2.1.268/tools/CronCreate.txt?surface=subagent-general-purpose - CronDelete: https://changelogs.core-directive.com/prompts/2.1.268/tools/CronDelete.txt?surface=subagent-general-purpose - CronList: https://changelogs.core-directive.com/prompts/2.1.268/tools/CronList.txt?surface=subagent-general-purpose - Edit: https://changelogs.core-directive.com/prompts/2.1.268/tools/Edit.txt?surface=subagent-general-purpose - EnterWorktree: https://changelogs.core-directive.com/prompts/2.1.268/tools/EnterWorktree.txt?surface=subagent-general-purpose - ExitWorktree: https://changelogs.core-directive.com/prompts/2.1.268/tools/ExitWorktree.txt?surface=subagent-general-purpose - ListAgents: https://changelogs.core-directive.com/prompts/2.1.268/tools/ListAgents.txt?surface=subagent-general-purpose - NotebookEdit: https://changelogs.core-directive.com/prompts/2.1.268/tools/NotebookEdit.txt?surface=subagent-general-purpose - Read (changed in this version): https://changelogs.core-directive.com/prompts/2.1.268/tools/Read.txt?surface=subagent-general-purpose - ReportFindings: https://changelogs.core-directive.com/prompts/2.1.268/tools/ReportFindings.txt?surface=subagent-general-purpose - SendMessage: https://changelogs.core-directive.com/prompts/2.1.268/tools/SendMessage.txt?surface=subagent-general-purpose - Skill: https://changelogs.core-directive.com/prompts/2.1.268/tools/Skill.txt?surface=subagent-general-purpose - TaskStop: https://changelogs.core-directive.com/prompts/2.1.268/tools/TaskStop.txt?surface=subagent-general-purpose - WebFetch (changed in this version): https://changelogs.core-directive.com/prompts/2.1.268/tools/WebFetch.txt?surface=subagent-general-purpose - WebSearch: https://changelogs.core-directive.com/prompts/2.1.268/tools/WebSearch.txt?surface=subagent-general-purpose - Write: https://changelogs.core-directive.com/prompts/2.1.268/tools/Write.txt?surface=subagent-general-purpose ## Full text - system prompt: https://changelogs.core-directive.com/prompts/2.1.268/system.txt?surface=subagent-general-purpose