Ultrathink
Use /ultrathink to launch a Coordinator Agent that directs four specialist sub-agents—Architect, Research, Coder, and Tester—to analyze, design, implement, and validate your coding task. The process breaks the task into clear steps, gathers insights, and synthesizes a cohesive solution with actionable outputs. Relevant files can be referenced ad-hoc using @ filename syntax.
- Type
- Plugin
- Repository
- ccplugins/awesome-claude-code-plugins
- GitHub stars
- 954
- License
- Apache-2.0
- Repo last updated
- Aug 12, 2026
- Source file
- plugins/ultrathink/.claude-plugin/plugin.json
- Version
- 1.0.0
- Author
- Jeronim Morina
What Ultrathink is
Ultrathink is a plugin published in the ccplugins/awesome-claude-code-plugins repository on GitHub, which has about 954 stars. The repository describes itself as: “Awesome Claude Code plugins — a curated list of slash commands, subagents, MCP servers, and hooks for Claude Code”
A plugin is a package that bundles skills, slash commands, subagents, hooks, and MCP connectors so they install together. Plugins are plain files with a manifest at .claude-plugin/plugin.json, and they work in both Claude Code and Claude Cowork.
Installing Ultrathink adds everything it ships in one step. Connectors inside a plugin still need to be connected separately, and hooks and subagents only run in Cowork and Claude Code, not in regular chat.
How to install Ultrathink
Claude Code
- Add the repository as a plugin marketplace: claude plugin marketplace add ccplugins/awesome-claude-code-plugins
- Install the plugin: claude plugin install ultrathink@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json.
- Restart the session if the new skills or commands don't appear straight away.
Claude Cowork
- Open Customize → Plugins and choose Add marketplace.
- Enter ccplugins/awesome-claude-code-plugins (the owner/repo shorthand works for GitHub).
- Find Ultrathink in the list, click Install, then connect any connectors it needs from its Connectors tab.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
We couldn't retrieve the source file for this entry. Browse the repository on GitHub to find it and read the README before installing.
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Ultrathink?
Ultrathink is a plugin for Claude Code and Claude Cowork from the ccplugins/awesome-claude-code-plugins repository on GitHub. Use /ultrathink to launch a Coordinator Agent that directs four specialist sub-agents—Architect, Research, Coder, and Tester—to analyze, design, implement, and validate your coding task. The process breaks the task into clear steps, gathers insights, and synthesizes a cohesive solution with actionable outputs. Relevant files can be referenced ad-hoc using @ filename syntax.
How do I install Ultrathink in Claude Code?
Add the repository as a plugin marketplace: claude plugin marketplace add ccplugins/awesome-claude-code-plugins Install the plugin: claude plugin install ultrathink@<marketplace-name>, using the marketplace name from the repository's .claude-plugin/marketplace.json. Restart the session if the new skills or commands don't appear straight away.
Can I use Ultrathink in Claude Cowork?
Open Customize → Plugins and choose Add marketplace. Enter ccplugins/awesome-claude-code-plugins (the owner/repo shorthand works for GitHub). Find Ultrathink in the list, click Install, then connect any connectors it needs from its Connectors tab.
Is Ultrathink safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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