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Sequential Thinking MCP Server

Q: How do I add the Sequential Thinking MCP server to Codex?

Run codex mcp add sequential-thinking npx -y @modelcontextprotocol/server-sequential-thinking.

Gives the model a structured tool for step-by-step reasoning that it can revise and branch.

Install

Claude Desktop

{"mcpServers":{"sequential-thinking":{"command":"npx","args":["-y","@modelcontextprotocol/server-sequential-thinking"]}}}

Copilot (VS Code)

{"servers":{"sequential-thinking":{"command":"npx","args":["-y","@modelcontextprotocol/server-sequential-thinking"]}}}

Codex

codex mcp add sequential-thinking npx -y @modelcontextprotocol/server-sequential-thinking

Commands and configuration as given in the server’s documentation (Documentation). Replace placeholders such as API keys with your own values.

A Model Context Protocol reference server that gives the model a tool for step-by-step reasoning.

The Sequential Thinking MCP server is one of the Model Context Protocol reference servers. It gives the model a structured tool, sequential_thinking, for step-by-step reasoning that it can revise and branch. It runs locally over stdio through npx or Docker, needs no authentication and is MIT-licensed. Its README shows setup for Claude Desktop, Copilot in VS Code and Codex.

The model records numbered thoughts, estimates how many it needs, revises earlier steps, and branches into alternatives. It helps with planning and with problems whose scope only becomes clear along the way.

Questions

What does the Sequential Thinking MCP server do?

It lets the model record numbered thoughts, estimate how many it needs, revise earlier steps and branch into alternatives.

How do I add the Sequential Thinking MCP server to Codex?

Run codex mcp add sequential-thinking npx -y @modelcontextprotocol/server-sequential-thinking.

Does the Sequential Thinking MCP server need an API key?

No. It needs no authentication.

When is the Sequential Thinking MCP server useful?

It helps with planning and with problems whose scope only becomes clear along the way.

Sources

Checked October 2, 2026.

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