Arc

Author a new @tool-decorated Python file in the agent workspace, validate it, and register it via reload().

Update an existing @tool source file in workspace/capabilities/, bumping its semver per major/minor/patch.

Scaffold a new skill folder under workspace/capabilities/skills/ with frontmatter and the seven required sections.

Update an existing skill's SKILL.md body in workspace/capabilities/skills/, bumping its frontmatter semver.