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CopilotKit

Community
Framework / SDK
The Frontend Stack for Agents & Generative UI

This is a framework for building MCP servers or agents, not a server you connect a client to.

How to install ↓ Compare GitHub source repository ↗
Category
Dev Tools #74 of 438
Stars
★ 37.9k Very popular
Transport
stdio (local process)
Runtime
Node.js
Credentials
Optional API key
License
MIT
Last commit
63FMRS · C

CopilotKit is a powerful multi-platform agentic framework with rich features, but it is important to clarify that it is an SDK, not an MCP server.

Strongest · Maintenance 18/20 Weakest · Reliability 8/20

Reliability
8/20
Security and permissions
12/20
Maintenance
18/20
Documentation
15/20
Setup experience
10/20
Why each score
Reliability 8/20
The repository provides no explicit MCP server manifest or code paths exposing MCP tools. The project is described as an SDK for building agentic applications, not a dedicated MCP server. No verifiable source evidence indicates it can start cleanly and complete the MCP handshake. Reliability is capped low due to lack of execution evidence. The repository has many tests and CI, but no tests for MCP-specific functionality.
Security and permissions 12/20
The project is an open-source SDK under MIT license, and does not involve ambiguous credential handling or dangerous operations. However, it is used to build applications that require external LLM API keys. Static inspection reveals no clear malicious behavior or gross overreach. Since it's a large framework, security boundaries and scope of usage are broad, and risks from dependencies are not revealed. No red-line issues detected, so security score remains moderate.
Maintenance 18/20
The repository is very active with over 36k stars and is not archived. It has an MIT license, active development, frequent releases, and community engagement (Discord). Issue count is high (384) but this is a large project. Maintenance score is high because no signs of abandonment or governance gaps are evident.
Documentation 15/20
The README is comprehensive, with quickstart, features, platform support tables, examples, and links to docs. It provides install and usage instructions but lacks specific details about MCP server integration. Documentation may not cover MCP-specific troubleshooting or limitations. As a general SDK, documentation is good but not specifically tailored to MCP server usage.
Setup experience 10/20
Static review cannot verify actual installation process due to no execution environment. The repository offers `npx copilotkit@latest create`, but that is not an MCP server setup. There is no clear path from zero to a working MCP server connection. Score is limited due to lack of execution verification and platform compatibility specifics.

Static review · not runListed 2026-08-07

Read the FMRS scoring method →

Fit and risk

What it can accessUses the network

Best for

  • Full-stack developers building generative UI quickly
  • Teams wanting to deploy the same agent across web, mobile, and Slack
  • Projects using React, Angular, Vue, or React Native

Not for

  • Scenarios requiring persistent agent state (needs extra setup)
  • Projects needing only simple chatbots without generative UI
  • Projects not using a frontend framework

Required permissions

  • Requires an LLM API key (e.g., OpenAI, Anthropic, Gemini)
  • May need network access to connect to agent services

Risks and side effects

  • As an MCP server, there may be a mismatch since CopilotKit is an SDK, not a native MCP server; tools may not be directly exposed.
  • Dependency on external LLM services may incur costs.
  • Generative UI may introduce security risks; user input must be handled carefully.

Setup

Before you start

Runtime：Node.js

To get started, run npx copilotkit@latest create to create a new project, or npx copilotkit@latest skills install to install agent skills.

Check that it works

After running npx copilotkit@latest create, confirm the app has core packages installed, the provider configured, and agent-to-UI connectivity working (agents can stream actions and render UI).

Troubleshooting

  1. Ensure LLM API keys are correctly configured.
  2. Check network connectivity to external services.
  3. Refer to the documentation for common issues and solutions.

Things to try

Once connected, you can ask your AI assistant things like:

  • Scaffold a new CopilotKit app with npx copilotkit@latest create.
  • Install CopilotKit agent skills into my project so my coding agent knows how to build with CopilotKit.
  • Use the useAgent hook to read and update the agent's state, such as agent.state.city.
  • Create an AG-UI based agent app with npx create-ag-ui-app.

Use cases

Build chat interfaces in React or Next.js apps
Implement backend tool rendering for agents to return UI components
Build generative UI that dynamically renders components
Create shared state for real-time sync between agents and UI
Integrate human-in-the-loop workflows for approvals and input

Overview

CopilotKit is an SDK for building full-stack agentic applications, Generative UI, and chat applications. It supports React, Angular, Vue, React Native, and more, allowing the same agent to power web, mobile, and Slack. CopilotKit is the creator of the AG-UI Protocol, adopted by Google, LangChain, AWS, Microsoft, and others.

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Source revision 04bc56aeff50 Data synced 2026-10-12 Read the FMRS scoring method