ecosystem-authoritative-sources

name	ecosystem-authoritative-sources
description	Provides information about how to create, structure, install, and audit Agent Skills, Plugins, Antigravity Workflows, and Sub-agents. Trigger this when specifications, rules, or best practices for the ecosystem are required.
disable-model-invocation	false
allowed-tools	Bash, Read, Write

Ecosystem Authoritative Sources

Official Open Standard Recognition

Important: This reference library draws heavy inspiration and structural standards directly from the Anthropic Claude Plugins official repositories. Please refer to:

• Foundational Specification: https://github.com/anthropics/claude-plugins-official/tree/main/plugins/plugin-dev
• L4 Interaction & Execution Patterns: Derived from https://github.com/anthropics/claude-knowledgework-plugins (specifically the Legal and Bio-Research plugins).

The Library

The following open standards are available for review:

This skill provides comprehensive information and reference guides about the conventions and constraints defining the extensibility ecosystem.

Because of the Progressive Disclosure architecture, you should selectively read the reference files below only when you need detailed information on that specific topic.

Table of Contents

To read any of the reference guides, use your file system tools to cat or view the relevant file.

• Agent Skills: Definition, lifecycle, progressive disclosure, and constraints of .claude/skills/ (and equivalents like .agent/skills/ and .github/skills/). Custom agents deployed as Skills are stored here as <plugin>-<agent>/SKILL.md.
  • reference/skills.md
  • reference/skill-execution-flow.mmd
• Claude Plugins: Specification for the .claude-plugin architecture, manifest setup, and distribution.
  • reference/plugins.md
  • reference/plugin-architecture.mmd
• Antigravity Workflows & Rules (and Legacy Commands): Specifications for global/workspace Rules, deterministic trajectory Workflows, and the critical distinction between deploying Skills vs. Legacy Commands.
  • reference/workflows.md
• Sub-Agents: Definition, setup, and orchestration of nested contextual LLM boundaries. Sub-Agents are deployed structurally as pure Skills (mapped to skills/<agent-name>/SKILL.md).
  • reference/sub-agents.md
• GitHub Copilot Prompts (Models): Documentation on the exact YAML schema, dynamic variables, and exclusion logic (exclude-targets) used by GitHub Copilot chat environments.

Usage Instruction

Never guess the specifics of SKILL.md frontmatter, plugin directory limits, or workflow sizes. Read the exact specifications linked above before constructing new ecosystem extensions.