LangGPT Demo: MCP server for sequential thinking and problem solving based on Anthropic's original implementation
npm install @iflow-mcp/sequential-thinking-mcp
> Note: This is a demonstration version by LangGPT, based on the original Sequential Thinking MCP Server from Anthropic's Model Context Protocol. This demo showcases how to extend and publish MCP servers for the Claude ecosystem.
An MCP server implementation that provides a tool for dynamic and reflective problem-solving through a structured thinking process. This server enables Claude to break down complex problems into manageable, trackable steps with support for revision and branching.
- Break down complex problems into manageable steps
- Revise and refine thoughts as understanding deepens
- Branch into alternative paths of reasoning
- Adjust the total number of thoughts dynamically
- Generate and verify solution hypotheses
Facilitates a detailed, step-by-step thinking process for problem-solving and analysis.
Inputs:
- thought (string): The current thinking step
- nextThoughtNeeded (boolean): Whether another thought step is needed
- thoughtNumber (integer): Current thought number
- totalThoughts (integer): 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
The Sequential Thinking tool is designed for:
- 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
- Tasks that need to maintain context over multiple steps
- Situations where irrelevant information needs to be filtered out
Add this to your claude_desktop_config.json:
``json`
{
"mcpServers": {
"sequential-thinking": {
"command": "npx",
"args": ["-y", "@langgpt/sequential-thinking-mcp"]
}
}
}
`json`
{
"mcpServers": {
"sequential-thinking": {
"command": "docker",
"args": [
"run",
"--rm",
"-i",
"langgpt/sequential-thinking-mcp"
]
}
}
}
After adding the configuration, restart Claude Desktop and try asking:
`
Please use the sequential thinking tool to analyze this complex problem step by step.
For quick installation, click one of the installation buttons below...
 
 
For manual installation, add the following JSON block to your User Settings (JSON) file in VS Code. You can do this by pressing Ctrl + Shift + P and typing Preferences: Open Settings (JSON).
Optionally, you can add it to a file called .vscode/mcp.json in your workspace. This will allow you to share the configuration with others.
> Note that the mcp key is not needed in the .vscode/mcp.json file.
For NPX installation:
`json`
{
"mcp": {
"servers": {
"sequential-thinking": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-sequential-thinking"
]
}
}
}
}
For Docker installation:
`json`
{
"mcp": {
"servers": {
"sequential-thinking": {
"command": "docker",
"args": [
"run",
"--rm",
"-i",
"mcp/sequentialthinking"
]
}
}
}
}
Docker:
`bash`
docker build -t mcp/sequentialthinking -f src/sequentialthinking/Dockerfile .
- Node.js (version 18 or higher)
- npm (usually installed with Node.js)
1. Install dependencies
`bash`
npm install
2. Build project
`bash`
npm run build
This compiles TypeScript code to the dist/ directory.
3. Development mode
`bash`
npm run watch
This starts watch mode for automatic recompilation.
If you want to use this MCP server from local source code, follow these steps:
1. Ensure project is built
`bash`
npm run build
2. Locate Claude Desktop config file
- macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
- Windows:
3. Add local configuration
`json`
{
"mcpServers": {
"sequential-thinking": {
"command": "node",
"args": ["/your/absolute/path/to/project/dist/index.js"],
"env": {
"DISABLE_THOUGHT_LOGGING": "false"
}
}
}
}
Important: Replace /your/absolute/path/to/project/dist/index.js with your actual project path!
4. Restart Claude Desktop
After saving the config file, restart the Claude Desktop application.
5. Test the tool
Test in Claude with something like:
`
Please use the sequential thinking tool to analyze a complex problem
This sequential thinking tool enables Claude to:
- Break down complex problems into manageable steps
- Revise and refine thoughts as understanding deepens
- Branch into alternative paths of reasoning
- Adjust the total number of thoughts dynamically
- Generate and verify solution hypotheses
- DISABLE_THOUGHT_LOGGING=true - Disable console output of thinking process
This section provides guidance for developers who want to publish their own version of this MCP server.
- Node.js (version 18 or higher)
- npm account for NPM publishing
- Docker Hub account for Docker publishing (optional)
- GitHub account for source code hosting
1. Update package.json
Modify the package configuration for your own project:
`json`
{
"name": "@langgpt/sequential-thinking-mcp",
"version": "1.0.0",
"description": "MCP server for sequential thinking and problem solving",
"author": "LangGPT
"homepage": "https://github.com/langgpt/sequential-thinking-mcp",
"bugs": "https://github.com/langgpt/sequential-thinking-mcp/issues",
"repository": {
"type": "git",
"url": "git+https://github.com/langgpt/sequential-thinking-mcp.git"
},
"keywords": [
"mcp",
"model-context-protocol",
"claude",
"thinking",
"ai-tools"
]
}
2. Ensure all files are ready
`bash`
npm install
npm run build
1. Login to NPM
`bash`
npm login
2. Publish the package
`bash`
npm publish --access public
3. Version management
`bash`
# Update version and republish
npm version patch # 1.0.0 -> 1.0.1
npm publish
1. Build Docker image
`bash`
docker build -t langgpt/sequential-thinking-mcp .
2. Test the image
`bash`
docker run --rm -i langgpt/sequential-thinking-mcp
3. Push to Docker Hub
`bash`
docker login
docker push langgpt/sequential-thinking-mcp
# Also push with version tag
docker tag langgpt/sequential-thinking-mcp langgpt/sequential-thinking-mcp:1.0.0
docker push langgpt/sequential-thinking-mcp:1.0.0
1. Initialize repository
`bash`
git init
git add .
git commit -m "Initial commit: Sequential thinking MCP server"
2. Push to GitHub
`bash`
git remote add origin https://github.com/langgpt/sequential-thinking-mcp.git
git push -u origin main
3. Create GitHub Release
- Go to your repository on GitHub
- Click "Releases" → "Create a new release"
- Add tag (e.g., v1.0.0) and release notes
Once published, users can install and use your MCP server in the following ways:
#### NPM Installation
`json`
{
"mcpServers": {
"sequential-thinking": {
"command": "npx",
"args": ["-y", "@langgpt/sequential-thinking-mcp"]
}
}
}
#### Docker Installation
`json`
{
"mcpServers": {
"sequential-thinking": {
"command": "docker",
"args": [
"run",
"--rm",
"-i",
"langgpt/sequential-thinking-mcp"
]
}
}
}
#### GitHub Installation
`json``
{
"mcpServers": {
"sequential-thinking": {
"command": "npx",
"args": [
"-y",
"https://github.com/langgpt/sequential-thinking-mcp#main"
]
}
}
}
This MCP server is licensed under the MIT License. This means you are free to use, modify, and distribute the software, subject to the terms and conditions of the MIT License. For more details, please see the LICENSE file in the project repository.