stack-effect

Use this skill whenever working on stack-effect catalog generated code, catalog content strings, module definitions, scaffold templates, or anything under packages/catalog/src/registry/content or packages/catalog/src/registry/modules. It teaches the agent to avoid editing catalog TypeScript template strings first; instead reset the generated catalog workspace, edit real generated files with LSP/type-check feedback, inspect git diff in the workspace, then port the minimal changes back into the catalog.