Track Agent Plugins 1.0 packaging and marketplace distribution

Summary

Package the WinUI plugin using the Agent Plugins 1.0.0 portable format and track publication to the major public agent/plugin directories.

Agent Plugins 1.0.0 standardizes portable packaging for Agent Skills and MCP servers. Marketplace discovery and review remain platform-specific, so each public directory needs a separate submission.

Work items

Portable packaging

• Update plugins/winui/plugin.json to conform to Agent Plugins 1.0.0.
• Add the required $schema: https://agent-plugins.org/schemas/1.0.0/plugin.schema.json.
• Remove non-portable top-level component declarations; allow skills to be discovered from skills/.
• Put Copilot-specific agents and other client capabilities under com.github.copilot/ while preserving existing Claude Code and Codex compatibility.
• Keep the existing .claude-plugin/plugin.json and .codex-plugin/plugin.json compatibility manifests until their respective clients document otherwise.

Release consistency and validation

• Synchronize the version across the portable manifest, client-specific manifests, marketplace files, and package metadata.
• Validate the Agent Plugins schema and all SKILL.md files in CI.
• Add installation/loading smoke tests for GitHub Copilot, Cursor, Claude Code, and Codex where practical.
• Publish an immutable release tag and record the full commit SHA for marketplace reviews.
• Document tested installation instructions for each supported client in the README.

Public marketplace submissions

• Submit the tagged plugin to the Awesome Copilot external-plugin review workflow.
• Submit it to the Cursor Marketplace.
• Submit it to the Claude Code official plugin directory.
• Submit it to the OpenAI universal plugin directory for ChatGPT and Codex, if eligible under the current submission requirements.
• Record submission and listing links in this issue.

Acceptance criteria

• plugins/winui validates as an Agent Plugins 1.0.0 package.
• Existing GitHub Copilot, Claude Code, and Codex installation paths continue to work.
• Versions and release metadata are consistent across every distribution surface.
• The plugin is submitted to each applicable public marketplace, with status and links tracked here.

Public references

• Agent Plugins 1.0.0 specification
• Agent Plugins reference package
• Cursor plugin publishing
• Claude Code official plugin directory
• OpenAI plugin packaging
• Awesome Copilot contribution guidance