# Claude Code v2.1.197: system prompt > 3 added and 3 removed, of 223 lines, about 124 words, in the prompt 17 of 27 arms receive. 2 other prompts also changed. 1 of 27 tool descriptions changed. Compared against v2.1.196. The two arm counts on this page measure different things: 17 arms receive the prompt the headline is about, and the widest edit below reached 23, because the same changed lines sit in more than one prompt. Web version: https://changelogs.core-directive.com/prompts/2.1.197?arm=cli ## What this version holds - model strings captured: 27 - tool descriptions: 27 - compared against: v2.1.196 - system prompt edits: 4 - widest system prompt edit: +1/-1 lines - tool descriptions changed: 1 ## What moved ### System prompt, reached 23 of 27 arms (+1/-1 lines) This edit reached 23 of 27 arms: (unset), claude-opus-4-0, claude-opus-4-1, opus, claude-3-5-haiku, claude-3-5-sonnet, claude-3-7-sonnet, claude-3-opus, claude-fable-5, claude-haiku-4-5, claude-mythos-5, claude-opus-4-5, claude-opus-4-6, claude-opus-4-7, claude-opus-4-8, claude-opus-5, claude-opus-5[1m], claude-sonnet-4-0, claude-sonnet-4-5, claude-sonnet-4-6, default, haiku, sonnet[1m]. The same edit landed in 19 other copies of this prompt, which differ from this one only in text interpolated per model. ```diff @@ from line 50 @@ - OS Version: Linux 5.15.0-187-generic - You are powered by the model named Opus 4.8 (1M context). The exact model ID is claude-opus-4-8[1m]. - Assistant knowledge cutoff is January 2026. - - The most recent Claude models are Fable 5 and the Claude 4.X family. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', Sonnet 4.6: 'claude-sonnet-4-6', Haiku 4.5: 'claude-haiku-4-5-20251001'. When building AI applications, default to the latest and most capable Claude models. + - The most recent Claude models are the Claude 5 family, Opus 4.8, and Haiku 4.5. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', 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. - Claude Code is available as a CLI in the terminal, desktop app (Mac/Windows), web app (claude.ai/code), and IDE extensions (VS Code, JetBrains). - Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is available on Opus 4.8/4.7. ``` ### System prompt, Sonnet (+3/-3 lines) This edit reached 2 of 27 arms: opusplan, sonnet. ```diff @@ from line 211 @@ - Platform: linux - Shell: unknown - OS Version: Linux 5.15.0-187-generic - - You are powered by the model named Sonnet 4.6. The exact model ID is claude-sonnet-4-6. - - Assistant knowledge cutoff is August 2025. - - The most recent Claude models are Fable 5 and the Claude 4.X family. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', Sonnet 4.6: 'claude-sonnet-4-6', Haiku 4.5: 'claude-haiku-4-5-20251001'. When building AI applications, default to the latest and most capable Claude models. + - You are powered by the model named Sonnet 5. The exact model ID is claude-sonnet-5. + - Assistant knowledge cutoff is January 2026. + - The most recent Claude models are the Claude 5 family, Opus 4.8, and Haiku 4.5. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', 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. - Claude Code is available as a CLI in the terminal, desktop app (Mac/Windows), web app (claude.ai/code), and IDE extensions (VS Code, JetBrains). - Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is available on Opus 4.8/4.7. ``` ### System prompt, Sonnet 5 (+3/-2 lines) This edit reached 1 of 27 arms: claude-sonnet-5. ```diff @@ from line 211 @@ - Platform: linux - Shell: unknown - OS Version: Linux 5.15.0-187-generic - - You are powered by the model claude-sonnet-5. - - The most recent Claude models are Fable 5 and the Claude 4.X family. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', Sonnet 4.6: 'claude-sonnet-4-6', Haiku 4.5: 'claude-haiku-4-5-20251001'. When building AI applications, default to the latest and most capable Claude models. + - You are powered by the model named Sonnet 5. The exact model ID is claude-sonnet-5. + - Assistant knowledge cutoff is January 2026. + - The most recent Claude models are the Claude 5 family, Opus 4.8, and Haiku 4.5. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', 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. - Claude Code is available as a CLI in the terminal, desktop app (Mac/Windows), web app (claude.ai/code), and IDE extensions (VS Code, JetBrains). - Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is available on Opus 4.8/4.7. ``` ### System prompt, Sonnet (+3/-2 lines) This edit reached 1 of 27 arms: claude-sonnet-5[1m]. ```diff @@ from line 211 @@ - Platform: linux - Shell: unknown - OS Version: Linux 5.15.0-187-generic - - You are powered by the model claude-sonnet-5[1m]. - - The most recent Claude models are Fable 5 and the Claude 4.X family. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', Sonnet 4.6: 'claude-sonnet-4-6', Haiku 4.5: 'claude-haiku-4-5-20251001'. When building AI applications, default to the latest and most capable Claude models. + - You are powered by the model named Sonnet 5. The exact model ID is claude-sonnet-5[1m]. + - Assistant knowledge cutoff is January 2026. + - The most recent Claude models are the Claude 5 family, Opus 4.8, and Haiku 4.5. Model IDs — Fable 5: 'claude-fable-5', Opus 4.8: 'claude-opus-4-8', 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. - Claude Code is available as a CLI in the terminal, desktop app (Mac/Windows), web app (claude.ai/code), and IDE extensions (VS Code, JetBrains). - Fast mode for Claude Code uses Claude Opus with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is available on Opus 4.8/4.7. ``` ### Tool: Bash, reached 2 of 27 arms (+2/-2 lines) This edit reached 2 of 27 arms: claude-sonnet-5, claude-sonnet-5[1m]. ```diff @@ from line 63 @@ 3. Run the following commands in parallel: - Add relevant untracked files to the staging area. - Create the commit with a message ending with: - Co-Authored-By: Claude + Co-Authored-By: Claude Sonnet 5 - Run git status after the commit completes to verify success. Note: git status depends on the commit completing, so run it sequentially after the commit. 4. If the commit fails due to pre-commit hook: fix the issue and create a NEW commit ``` ```diff @@ from line 80 @@ git commit -m "$(cat <<'EOF' Commit message here. - Co-Authored-By: Claude + Co-Authored-By: Claude Sonnet 5 EOF )" ``` ### Tool: Bash, Sonnet (+2/-2 lines) This edit reached 2 of 27 arms: opusplan, sonnet. ```diff @@ from line 63 @@ 3. Run the following commands in parallel: - Add relevant untracked files to the staging area. - Create the commit with a message ending with: - Co-Authored-By: Claude Sonnet 4.6 + Co-Authored-By: Claude Sonnet 5 - Run git status after the commit completes to verify success. Note: git status depends on the commit completing, so run it sequentially after the commit. 4. If the commit fails due to pre-commit hook: fix the issue and create a NEW commit ``` ```diff @@ from line 80 @@ git commit -m "$(cat <<'EOF' Commit message here. - Co-Authored-By: Claude Sonnet 4.6 + Co-Authored-By: Claude Sonnet 5 EOF )" ``` ## Tool descriptions - Agent: https://changelogs.core-directive.com/prompts/2.1.197/tools/Agent.txt?arm=cli - AskUserQuestion: https://changelogs.core-directive.com/prompts/2.1.197/tools/AskUserQuestion.txt?arm=cli - Bash (changed in this version): https://changelogs.core-directive.com/prompts/2.1.197/tools/Bash.txt?arm=cli - CronCreate: https://changelogs.core-directive.com/prompts/2.1.197/tools/CronCreate.txt?arm=cli - CronDelete: https://changelogs.core-directive.com/prompts/2.1.197/tools/CronDelete.txt?arm=cli - CronList: https://changelogs.core-directive.com/prompts/2.1.197/tools/CronList.txt?arm=cli - Edit: https://changelogs.core-directive.com/prompts/2.1.197/tools/Edit.txt?arm=cli - EnterPlanMode: https://changelogs.core-directive.com/prompts/2.1.197/tools/EnterPlanMode.txt?arm=cli - EnterWorktree: https://changelogs.core-directive.com/prompts/2.1.197/tools/EnterWorktree.txt?arm=cli - ExitPlanMode: https://changelogs.core-directive.com/prompts/2.1.197/tools/ExitPlanMode.txt?arm=cli - ExitWorktree: https://changelogs.core-directive.com/prompts/2.1.197/tools/ExitWorktree.txt?arm=cli - NotebookEdit: https://changelogs.core-directive.com/prompts/2.1.197/tools/NotebookEdit.txt?arm=cli - Read: https://changelogs.core-directive.com/prompts/2.1.197/tools/Read.txt?arm=cli - ReportFindings: https://changelogs.core-directive.com/prompts/2.1.197/tools/ReportFindings.txt?arm=cli - ScheduleWakeup: https://changelogs.core-directive.com/prompts/2.1.197/tools/ScheduleWakeup.txt?arm=cli - SendMessage: https://changelogs.core-directive.com/prompts/2.1.197/tools/SendMessage.txt?arm=cli - Skill: https://changelogs.core-directive.com/prompts/2.1.197/tools/Skill.txt?arm=cli - TaskCreate: https://changelogs.core-directive.com/prompts/2.1.197/tools/TaskCreate.txt?arm=cli - TaskGet: https://changelogs.core-directive.com/prompts/2.1.197/tools/TaskGet.txt?arm=cli - TaskList: https://changelogs.core-directive.com/prompts/2.1.197/tools/TaskList.txt?arm=cli - TaskOutput: https://changelogs.core-directive.com/prompts/2.1.197/tools/TaskOutput.txt?arm=cli - TaskStop: https://changelogs.core-directive.com/prompts/2.1.197/tools/TaskStop.txt?arm=cli - TaskUpdate: https://changelogs.core-directive.com/prompts/2.1.197/tools/TaskUpdate.txt?arm=cli - WebFetch: https://changelogs.core-directive.com/prompts/2.1.197/tools/WebFetch.txt?arm=cli - WebSearch: https://changelogs.core-directive.com/prompts/2.1.197/tools/WebSearch.txt?arm=cli - Workflow: https://changelogs.core-directive.com/prompts/2.1.197/tools/Workflow.txt?arm=cli - Write: https://changelogs.core-directive.com/prompts/2.1.197/tools/Write.txt?arm=cli ## Full text - system prompt: https://changelogs.core-directive.com/prompts/2.1.197/system.txt?arm=cli