Managed Package Rules is an agent skill from Portwood-Global-Solutions/Portwood. Constraints that only bite in a real managed-package install of Portwood — global visibility, Flow Apex-Defined types, namespace-prefixed keys, USERMODE on internal reads, immutable API names. Use when adding Apex a subscriber must see, building a Flow action, or debugging something that works in a scratch org but fails in a package install.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Documents & Office, covering CRM management. It works with Salesforce. The repository describes itself as: Free, native document generation for Salesforce. PDF, DOCX, XLSX, PPTX — merge tags, images, barcodes, QR codes, bulk generation, Flow actions. 100% Apex + LWC, zero external… The licence is Apache-2.0.