# Claude Code v2.1.216: system prompt > 1 of 27 tool descriptions changed. Compared against v2.1.215. Web version: https://changelogs.core-directive.com/prompts/2.1.216?arm=cli ## What this version holds - model strings captured: 27 - tool descriptions: 27 - compared against: v2.1.215 - system prompt edits: 0 - widest system prompt edit: +0/-0 lines - tool descriptions changed: 1 ## What moved ### Tool: Skill (+5/-16 lines) This edit reached all 27 arms. ```diff @@ from line 1 @@ -Execute a skill within the main conversation +Invoke a skill. -When users ask you to perform tasks, check if any of the available skills match. Skills provide specialized capabilities and domain knowledge. +A skill is a packaged set of instructions the user or project has set up for a particular kind of task (deploy steps, a review checklist, a repo-specific workflow). Available skills appear in a system-reminder listing with one-line descriptions. When the task at hand is one a listed skill covers, call this tool first — the skill's instructions load into the turn for you to follow in place of your default approach; some skills instead run in a subagent and return the finished result. Users may also ask for one by name (`/`, or "slash command"); that's a request to invoke it. -When users reference a "slash command" or "/", they are referring to a skill. Use this tool to invoke it. +- `skill`: exact name from the listing, no leading slash. Plugin skills use `plugin:skill`. Directory-scoped skills are listed with a path prefix (`apps/web:deploy`); when both scoped and unscoped variants of a name exist, pick the one whose directory contains the files you're working on (most specific wins; unscoped otherwise). +- `args`: optional arguments to pass through. -How to invoke: -- Set `skill` to the exact name of an available skill (no leading slash). For plugin-namespaced skills use the fully qualified `plugin:skill` form. -- Set `args` to pass optional arguments. -- Some skills are scoped to a directory: their name is prefixed with the directory (e.g. `apps/web:deploy`) and their description says which directory they apply to. When a skill name has both a scoped and an unscoped variant, pick by the files you are working on: if the files are under a variant's directory, invoke that variant (most specific directory wins); otherwise invoke the unscoped one. - -Important: -- Available skills are listed in system-reminder messages in the conversation -- Only invoke a skill that appears in that list, or one the user explicitly typed as `/` in their message. Never guess or invent a skill name from training data; otherwise do not call this tool -- When a skill matches the user's request, this is a BLOCKING REQUIREMENT: invoke the relevant Skill tool BEFORE generating any other response about the task -- NEVER mention a skill without actually calling this tool -- Do not invoke a skill that is already running -- Do not use this tool for built-in CLI commands (like /help, /clear, etc.) -- If you see a tag in the current conversation turn, the skill has ALREADY been loaded - follow the instructions directly instead of calling this tool again +Only names from the listing (or that the user typed explicitly) are valid. Built-in CLI commands (`/help`, `/clear`, …) aren't skills. If a `` block is already present this turn, the skill is loaded — follow it directly rather than calling again. ``` ## Tool descriptions - Agent: https://changelogs.core-directive.com/prompts/2.1.216/tools/Agent.txt?arm=cli - AskUserQuestion: https://changelogs.core-directive.com/prompts/2.1.216/tools/AskUserQuestion.txt?arm=cli - Bash: https://changelogs.core-directive.com/prompts/2.1.216/tools/Bash.txt?arm=cli - CronCreate: https://changelogs.core-directive.com/prompts/2.1.216/tools/CronCreate.txt?arm=cli - CronDelete: https://changelogs.core-directive.com/prompts/2.1.216/tools/CronDelete.txt?arm=cli - CronList: https://changelogs.core-directive.com/prompts/2.1.216/tools/CronList.txt?arm=cli - Edit: https://changelogs.core-directive.com/prompts/2.1.216/tools/Edit.txt?arm=cli - EnterPlanMode: https://changelogs.core-directive.com/prompts/2.1.216/tools/EnterPlanMode.txt?arm=cli - EnterWorktree: https://changelogs.core-directive.com/prompts/2.1.216/tools/EnterWorktree.txt?arm=cli - ExitPlanMode: https://changelogs.core-directive.com/prompts/2.1.216/tools/ExitPlanMode.txt?arm=cli - ExitWorktree: https://changelogs.core-directive.com/prompts/2.1.216/tools/ExitWorktree.txt?arm=cli - NotebookEdit: https://changelogs.core-directive.com/prompts/2.1.216/tools/NotebookEdit.txt?arm=cli - Read: https://changelogs.core-directive.com/prompts/2.1.216/tools/Read.txt?arm=cli - ReportFindings: https://changelogs.core-directive.com/prompts/2.1.216/tools/ReportFindings.txt?arm=cli - ScheduleWakeup: https://changelogs.core-directive.com/prompts/2.1.216/tools/ScheduleWakeup.txt?arm=cli - SendMessage: https://changelogs.core-directive.com/prompts/2.1.216/tools/SendMessage.txt?arm=cli - Skill (changed in this version): https://changelogs.core-directive.com/prompts/2.1.216/tools/Skill.txt?arm=cli - TaskCreate: https://changelogs.core-directive.com/prompts/2.1.216/tools/TaskCreate.txt?arm=cli - TaskGet: https://changelogs.core-directive.com/prompts/2.1.216/tools/TaskGet.txt?arm=cli - TaskList: https://changelogs.core-directive.com/prompts/2.1.216/tools/TaskList.txt?arm=cli - TaskOutput: https://changelogs.core-directive.com/prompts/2.1.216/tools/TaskOutput.txt?arm=cli - TaskStop: https://changelogs.core-directive.com/prompts/2.1.216/tools/TaskStop.txt?arm=cli - TaskUpdate: https://changelogs.core-directive.com/prompts/2.1.216/tools/TaskUpdate.txt?arm=cli - WebFetch: https://changelogs.core-directive.com/prompts/2.1.216/tools/WebFetch.txt?arm=cli - WebSearch: https://changelogs.core-directive.com/prompts/2.1.216/tools/WebSearch.txt?arm=cli - Workflow: https://changelogs.core-directive.com/prompts/2.1.216/tools/Workflow.txt?arm=cli - Write: https://changelogs.core-directive.com/prompts/2.1.216/tools/Write.txt?arm=cli ## Full text - system prompt: https://changelogs.core-directive.com/prompts/2.1.216/system.txt?arm=cli