# Claude Code v2.1.139: system prompt > 8 added and 5 removed, of 220 lines, about 158 words, in the prompt all 27 arms receive. 1 of 23 tool descriptions changed. Compared against v2.1.138. Web version: https://changelogs.core-directive.com/prompts/2.1.139?arm=sdk-cli ## What this version holds - model strings captured: 27 - tool descriptions: 23 - compared against: v2.1.138 - system prompt edits: 1 - widest system prompt edit: +8/-5 lines - tool descriptions changed: 1 ## What moved ### System prompt (+8/-5 lines) This edit reached all 27 arms. ```diff @@ from line 159 @@ ```markdown --- -name: {{memory name}} -description: {{one-line description — used to decide relevance in future conversations, so be specific}} -type: {{user, feedback, project, reference}} +name: {{short-kebab-case-slug}} +description: {{one-line summary — used to decide relevance in future conversations, so be specific}} +metadata: + type: {{user, feedback, project, reference}} --- -{{memory content — for feedback/project types, structure as: rule/fact, then **Why:** and **How to apply:** lines}} +{{memory content — for feedback/project types, structure as: rule/fact, then **Why:** and **How to apply:** lines. Link related memories with [[their-name]].}} ``` +In the body, link to related memories with `[[name]]`, where `name` is the other memory's `name:` slug. Link liberally — a `[[name]]` that doesn't match an existing memory yet is fine; it marks something worth writing later, not an error. + **Step 2** — add a pointer to that file in `MEMORY.md`. `MEMORY.md` is an index, not a memory — each entry should be one line, under ~150 characters: `- [Title](file.md) — one-line hook`. It has no frontmatter. Never write memory content directly into `MEMORY.md`. - `MEMORY.md` is always loaded into your conversation context — lines after 200 will be truncated, so keep the index concise ``` ```diff @@ from line 217 @@ - Fast mode for Claude Code uses Claude Opus 4.6 with faster output (it does not downgrade to a smaller model). It can be toggled with /fast and is only available on Opus 4.6. # Context management -When working with tool results, write down any important information you might need later in your response, as the original tool result may be cleared later. +When the conversation grows long, some or all of the current context is summarized; the summary, along with any remaining unsummarized context, is provided in the next context window so work can continue — you don't need to wrap up early or hand off mid-task. ``` ### Tool: Agent (+1/-0 lines) This edit reached all 27 arms. ```diff @@ from line 1 @@ Launch a new agent to handle complex, multi-step tasks. Each agent type has specific capabilities and tools available to it. Available agent types and the tools they have access to: +- claude: Catch-all for any task that doesn't fit a more specific agent. FleetView's default when no agent name is typed. (Tools: *) - Explore: Fast read-only search agent for locating code. Use it to find files by pattern (eg. "src/components/**/*.tsx"), grep for symbols or keywords (eg. "API endpoints"), or answer "where is X defined / which files reference Y." Do NOT use it for code review, design-doc auditing, cross-file consistency checks, or open-ended analysis — it reads excerpts rather than whole files and will miss content past its read window. When calling, specify search breadth: "quick" for a single targeted lookup, "medium" for moderate exploration, or "very thorough" to search across multiple locations and naming conventions. (Tools: All tools except Agent, ExitPlanMode, Edit, Write, NotebookEdit) - general-purpose: General-purpose agent for researching complex questions, searching for code, and executing multi-step tasks. When you are searching for a keyword or file and are not confident that you will find the right match in the first few tries use this agent to perform the search for you. (Tools: *) - Plan: Software architect agent for designing implementation plans. Use this when you need to plan the implementation strategy for a task. Returns step-by-step plans, identifies critical files, and considers architectural trade-offs. (Tools: All tools except Agent, ExitPlanMode, Edit, Write, NotebookEdit) ``` ## Tool descriptions - Agent (changed in this version): https://changelogs.core-directive.com/prompts/2.1.139/tools/Agent.txt?arm=sdk-cli - AskUserQuestion: https://changelogs.core-directive.com/prompts/2.1.139/tools/AskUserQuestion.txt?arm=sdk-cli - Bash: https://changelogs.core-directive.com/prompts/2.1.139/tools/Bash.txt?arm=sdk-cli - CronCreate: https://changelogs.core-directive.com/prompts/2.1.139/tools/CronCreate.txt?arm=sdk-cli - CronDelete: https://changelogs.core-directive.com/prompts/2.1.139/tools/CronDelete.txt?arm=sdk-cli - CronList: https://changelogs.core-directive.com/prompts/2.1.139/tools/CronList.txt?arm=sdk-cli - Edit: https://changelogs.core-directive.com/prompts/2.1.139/tools/Edit.txt?arm=sdk-cli - EnterPlanMode: https://changelogs.core-directive.com/prompts/2.1.139/tools/EnterPlanMode.txt?arm=sdk-cli - EnterWorktree: https://changelogs.core-directive.com/prompts/2.1.139/tools/EnterWorktree.txt?arm=sdk-cli - ExitPlanMode: https://changelogs.core-directive.com/prompts/2.1.139/tools/ExitPlanMode.txt?arm=sdk-cli - ExitWorktree: https://changelogs.core-directive.com/prompts/2.1.139/tools/ExitWorktree.txt?arm=sdk-cli - Glob: https://changelogs.core-directive.com/prompts/2.1.139/tools/Glob.txt?arm=sdk-cli - Grep: https://changelogs.core-directive.com/prompts/2.1.139/tools/Grep.txt?arm=sdk-cli - NotebookEdit: https://changelogs.core-directive.com/prompts/2.1.139/tools/NotebookEdit.txt?arm=sdk-cli - Read: https://changelogs.core-directive.com/prompts/2.1.139/tools/Read.txt?arm=sdk-cli - ScheduleWakeup: https://changelogs.core-directive.com/prompts/2.1.139/tools/ScheduleWakeup.txt?arm=sdk-cli - Skill: https://changelogs.core-directive.com/prompts/2.1.139/tools/Skill.txt?arm=sdk-cli - TaskOutput: https://changelogs.core-directive.com/prompts/2.1.139/tools/TaskOutput.txt?arm=sdk-cli - TaskStop: https://changelogs.core-directive.com/prompts/2.1.139/tools/TaskStop.txt?arm=sdk-cli - TodoWrite: https://changelogs.core-directive.com/prompts/2.1.139/tools/TodoWrite.txt?arm=sdk-cli - WebFetch: https://changelogs.core-directive.com/prompts/2.1.139/tools/WebFetch.txt?arm=sdk-cli - WebSearch: https://changelogs.core-directive.com/prompts/2.1.139/tools/WebSearch.txt?arm=sdk-cli - Write: https://changelogs.core-directive.com/prompts/2.1.139/tools/Write.txt?arm=sdk-cli ## Full text - system prompt: https://changelogs.core-directive.com/prompts/2.1.139/system.txt?arm=sdk-cli