Sequential Thinking MCP Server

A Model Context Protocol server that provides structured sequential thinking capabilities for complex reasoning tasks, enabling systematic problem breakdown and iterative refinement.

Overview and Purpose

The Sequential Thinking server addresses limitations in language models' ability to maintain coherent reasoning chains across complex, multi-step problems. It provides a framework for systematic thought progression, ensuring logical consistency and context preservation throughout extended reasoning processes.

Architecture: Code Mode

This server follows the "Code Mode" architecture, exposing a strict TypeScript API that allows LLMs to interact with the thinking process directly via code, rather than just through JSON-RPC tool calls. This enables more complex, stateful, and performant interactions.

Core Concepts

• Step-by-step progression: Systematic breakdown of complex problems into manageable sequential steps
• Context preservation: Maintaining coherent context throughout multi-step processes
• Iterative refinement: Support for revising and improving reasoning chains based on new insights
• Branching: Support for exploring alternative lines of reasoning

Capabilities

Tools

sequentialthinking

Structured sequential thinking tool for complex reasoning tasks.

Input Schema:

interface ThoughtData {
  thought: string; // The current thinking step
  thoughtNumber: number; // Current step number
  totalThoughts: number; // Estimated total steps
  nextThoughtNeeded: boolean; // Whether more steps are needed
  isRevision?: boolean; // Is this revising a previous thought?
  revisesThought?: number; // Which thought is being revised
  branchFromThought?: number; // Branching point
  branchId?: string; // Branch identifier
  needsMoreThoughts?: boolean; // If more thoughts are needed than estimated
}

Setup

bunx

{
  "mcpServers": {
    "Sequential Thinking": {
      "command": "bunx",
      "args": ["@wemake.cx/sequential-thinking@latest"]
    }
  }
}

Usage

Code Mode (Recommended)

LLMs can use the TypeScript API directly for better performance and type safety:

import { SequentialThinking } from "@wemake.cx/sequential-thinking";

const thinker = new SequentialThinking();

// Step 1: Initial thought
thinker.think({
  thought: "Analyzing the user's request to migrate to Code Mode",
  thoughtNumber: 1,
  totalThoughts: 3,
  nextThoughtNeeded: true
});

// Step 2: Detailed planning
thinker.think({
  thought: "I need to separate the Core logic from the MCP transport layer",
  thoughtNumber: 2,
  totalThoughts: 3,
  nextThoughtNeeded: true
});

// Step 3: Execution
thinker.think({
  thought: "Implementation complete. Verifying tests.",
  thoughtNumber: 3,
  totalThoughts: 3,
  nextThoughtNeeded: false
});