Skill: Write Agents Entry

Purpose

Write or revise AGENTS.md at the repo root per the "Output contract" section below, so that when an Agent touches the project it has a clear project identity, authoritative sources, and behavioral expectations, and behaves consistently and predictably. The output contract is embedded in this SKILL.md so one load gives the full spec and steps.

Core Objective

Primary Goal: Produce a compliant AGENTS.md file that establishes project identity, authoritative sources, and behavioral expectations for AI agents.

Success Criteria (ALL must be met):

1. ✅ AGENTS.md exists: File written to repo root and committed to version control
2. ✅ Three core elements present: Project identity, authoritative sources, and behavioral expectations sections exist
3. ✅ Seven sections complete: Opening, project identity, authoritative sources, behavior, discovery/loading summary, language/communication, and reference table
4. ✅ Executable behavior: Behavioral expectations use "must", "shall", or "must not" with actionable items
5. ✅ Reference table complete: Includes spec source, entry Raw URL (if applicable), definition specs, usage/install, and entry indexes