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The OpenAI plugin directory reads the portable Agent Plugins 1.0.0 manifest at the plugin root, with listing metadata nested under extensions["com.openai"]. ECC only shipped the .codex-plugin/plugin.json overlay, which the spec treats as a compatibility fallback for legacy packages, and whose top-level interface key is not valid in the portable format. Add plugin.json at the repository root carrying the same identity, skills, and MCP paths, with the OpenAI interface block under extensions["com.openai"]. Keep the .codex-plugin overlay, since the release surface, npm files list, and harness compliance checks still resolve it; the manifests are now pinned in sync by test. Point the directory policy URLs at ECC-owned pages instead of GitHub's own privacy statement and terms, which listing review rejects as not belonging to the publisher. These pages ship separately on ecc.tools and must be live before the listing is submitted. Refs ECC-063
Plugins and Marketplaces
Plugins extend Claude Code with new tools and capabilities. This guide covers installation only - see the full article for when and why to use them.
Marketplaces
Marketplaces are repositories of installable plugins.
Adding a Marketplace
# Add official Anthropic marketplace
claude plugin marketplace add https://github.com/anthropics/claude-plugins-official
# Add community marketplaces (mgrep by @mixedbread-ai)
claude plugin marketplace add https://github.com/mixedbread-ai/mgrep
Recommended Marketplaces
| Marketplace | Source |
|---|---|
| claude-plugins-official | anthropics/claude-plugins-official |
| claude-code-plugins | anthropics/claude-code |
| Mixedbread-Grep (@mixedbread-ai) | mixedbread-ai/mgrep |
Installing Plugins
# Open plugins browser
/plugins
# Or install directly
claude plugin install typescript-lsp@claude-plugins-official
Recommended Plugins
Development:
typescript-lsp- TypeScript intelligencepyright-lsp- Python type checkinghookify- Create hooks conversationallycode-simplifier- Refactor code
Code Quality:
code-review- Code reviewpr-review-toolkit- PR automationsecurity-guidance- Security checks
Search:
mgrep- Enhanced search (better than ripgrep)context7- Live documentation lookup
Workflow:
commit-commands- Git workflowfrontend-patterns- UI patternsfeature-dev- Feature development
Quick Setup
# Add marketplaces
claude plugin marketplace add https://github.com/anthropics/claude-plugins-official
claude plugin marketplace add https://github.com/mixedbread-ai/mgrep
# Open /plugins and install what you need
Plugin Files Location
~/.claude/plugins/
|-- cache/ # Downloaded plugins
|-- installed_plugins.json # Installed list
|-- known_marketplaces.json # Added marketplaces
|-- marketplaces/ # Marketplace data