# Skill > Invoke a registered skill from the current skill listing. BLOCKING REQUIREMENT: when a skill from the listing matches the user's request, you MUST call this tool (not free-form text). Do not re-invoke a skill to repeat work already done: if a `` block for it with the same `args` is already present in the conversation, follow those instructions directly instead of calling the tool again. Do call the tool again when you need the skill with different arguments — the loaded block was expanded with the earlier `args` and will not reflect new inputs. - Skill: `pymodel/skill` (Agent Skill, multi-file: 4 files) - Install (CLI): `npx skillmds@latest add pymodel/skill` - Raw SKILL.md: https://api.skillmd.com/api/skills/pymodel/skill/raw - Safety review: PASS (external: skill-scanner FAIL, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: AI & ML - Author: PyModel (https://skillmd.com/u/pymodel) - Updated: 2026-08-19 - Page: https://skillmd.com/skills/pymodel/skill --- Invoke a registered skill from the current skill listing. BLOCKING REQUIREMENT: when a skill from the listing matches the user's request, you MUST call this tool (not free-form text). Do not re-invoke a skill to repeat work already done: if a `` block for it with the same `args` is already present in the conversation, follow those instructions directly instead of calling the tool again. Do call the tool again when you need the skill with different arguments — the loaded block was expanded with the earlier `args` and will not reflect new inputs.