A Python implementation of the Sequential Thinking MCP server using the official Model Context Protocol (MCP) Python SDK. This server facilitates a detailed, step-by-step thinking process for problem-solving and analysis.

• 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

uv --directory "/path/to/sequential-thinking-mcp" run main.py

For development and testing, you can use the MCP CLI tools:

# Install MCP CLI tools
pip install "mcp[cli]"

# Run in development mode
mcp dev "/path/to/sequential-thinking-mcp"

# npx @modelcontextprotocol/inspector
npx @modelcontextprotocol/inspector uv --diectory "/path/to/sequential-thinking-mcp" run main.py

mcp install "\path\to\sequential-thinking-mcp\server.py"

{
  "mcpServers": {
    "sequential-thinking": {
      "command": "uv",
      "args": [
        "--directory",
        "/path/to/sequential-thinking-mcp",
        "run",
        "main.py"
      ]
    }
  }
}

The server provides a tool called sequential_thinking with the following parameters:

• thought (string): The current thinking step
• thoughtNumber (integer): Current thought number
• totalThoughts (integer): Estimated total thoughts needed
• nextThoughtNeeded (boolean): Whether another thought step is 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 server provides the following resources for accessing thought data:

• thoughts://history: Get the complete thought history
• thoughts://branches/{branch_id}: Get thoughts for a specific branch
• thoughts://summary: Get a summary of all thoughts and branches

• thinking_process_guide: Guide for using the sequential thinking process

# First thought
sequential_thinking(
    thought="First, we need to understand the problem requirements.",
    thoughtNumber=1,
    totalThoughts=5,
    nextThoughtNeeded=True
)

# Second thought
sequential_thinking(
    thought="Now, let's analyze the key constraints.",
    thoughtNumber=2,
    totalThoughts=5,
    nextThoughtNeeded=True
)

# Revise a thought
sequential_thinking(
    thought="Actually, we need to clarify the problem requirements first.",
    thoughtNumber=1,
    totalThoughts=5,
    nextThoughtNeeded=True,
    isRevision=True,
    revisesThought=1
)

# Branch from thought 2
sequential_thinking(
    thought="Let's explore an alternative approach.",
    thoughtNumber=3,
    totalThoughts=5,
    nextThoughtNeeded=True,
    branchFromThought=2,
    branchId="alternative-approach"
)

To use this server with Claude or other AI assistants that support MCP:

1. Install the MCP server in Claude Desktop using the MCP CLI
2. The AI can then use the sequential_thinking tool to break down complex problems

The Model Context Protocol (MCP) is a standardized way for applications to provide context and tools to LLMs. It allows:

• Resources: Providing contextual data to the LLM
• Tools: Exposing functionality for the LLM to take actions
• Prompts: Defining reusable templates for LLM interactions

For more information, visit modelcontextprotocol.io

MIT