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## Why Parallel research track to the Claude Code plugins research already committed. Needed to understand GitHub Copilot's extensibility model before designing cross-tool plugin compatibility for the kyberforge plugin system. ## Implementation Notes Three distinct Copilot extension tracks are covered: CLI plugins (plugin.json + marketplaces), cloud/IDE custom agents (frontmatter .md files committed to repos), and the SDK programmatic API. The SDK track got its own topic file (sdk.md) because the content doesn't fit neatly into the default topic list. Sources include Context7 (/websites/github_en_copilot), both user-provided reference URLs, and four additional deepened pages. ## Impact Provides a reference baseline for evaluating .claude-plugin/ / plugin.json compatibility between Claude Code and Copilot CLI — the two formats share a manifest discovery path and the strict:false field enables cross-tool plugin distribution. --- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>