Sequential Thinking

Sequential Thinking MCP Server - Streamable HTTP Implementation

An MCP server that provides a powerful sequential thinking tool for complex problem-solving through thoughts.

This server enables AI assistants to work through problems step-by-step, with the ability to revise, branch, and explore alternative approaches as understanding deepens.

- Dynamic Thought Process: Adjust the number of thoughts as you progress
- Revision Capability: Question and revise previous thoughts
- Branching Logic: Explore alternative approaches
- Flexible Planning: Add more thoughts even after reaching initial estimates
- Context Preservation: Maintain context across multiple thinking steps

To get started with this server, clone the repository and install the necessary dependencies.

git clone https://github.com/camilovelezr/server-sequential-thinking.git cd server-sequential-thinking npm install

The server uses the modern Streamable HTTP transport protocol for communication. Start the server:

The server will start onhttp://127.0.0.1:3000by default. You can change the port using thePORTenvironment variable:

- MCP Endpoint:POST/GET/DELETE http://127.0.0.1:3000/mcp- Main MCP communication endpoint

- POST- Send messages to the server (initialize, tool calls, etc.)
- GET- Establish SSE stream for server-to-client notifications
- DELETE- Terminate session

The Streamable HTTP transport provides several advantages:

- Session-Based State: Manages state for each client session in memory. The core server is long-running and can be scaled with sticky sessions.
- Flexible Streaming: Server can upgrade any response to SSE for streaming
- Infrastructure Compatible: Works with standard HTTP middleware and proxies
- Resumable Connections: Support for connection resumption
- Automatic Session Cleanup: Inactive sessions and their associated data are automatically cleared after 1 hour to conserve resources.

The implementation includes security measures:

- Origin header validation to prevent DNS rebinding attacks
- Server binds only to localhost (127.0.0.1)
- CORS headers are properly configured
- Session IDs are cryptographically secure
- Privacy by Design: No sensitive tool inputs or outputs are logged to the console.

To use this server with Cursor, add the following to your Cursor configuration:

{ "mcpServers": { "sequential-thinking": { "url": "http://localhost:3000/mcp" }, } }

You can also run the server in a containerized environment using Docker for easier deployment and isolation.

docker build -t mcp-server-sequential-thinking .

docker run -p 3000:3000 mcp-server-sequential-thinking

The server will be accessible athttp://127.0.0.1:3000.

A detailed tool for dynamic and reflective problem-solving through thoughts.

- Breaking down complex problems into steps
- Planning and design with room for revision
- Analysis that might need course correction
- Problems where the full scope might not be clear initially
- Multi-step solutions requiring context preservation

- thought(string, required): Your current thinking step
- nextThoughtNeeded(boolean, required): Whether another thought step is needed
- thoughtNumber(integer, required): Current thought number
- totalThoughts(integer, required): Estimated total thoughts needed
- isRevision(boolean, optional): Whether this revises previous thinking
- revisesThought(integer, optional): Which thought is being reconsidered
- branchFromThought(integer, optional): Branching point thought number
- branchId(string, optional): Branch identifier
- needsMoreThoughts(boolean, optional): If more thoughts are needed

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