Sequential Thinking MCP: Documentation
Updated:
Connection
npx -y @modelcontextprotocol/server-sequential-thinking (stdio). No authorization needed — the server calls no external APIs and stores no data between runs.
Tools
The single sequentialthinking tool takes: the text of the current thinking step, its step number and an estimate of the total number of steps (adjustable along the way), isRevision/revisesThought flags to revise an earlier step, branchFromThought/branchId to branch into an alternative reasoning path, and a nextThoughtNeeded flag to continue the chain or stop.
Agent flow
Working through a complex multi-step task where the model's silent internal logic isn't enough — you need a visible, correctable chain of steps: architecture planning, debugging a non-obvious issue, decomposing a task with an unknown number of steps upfront.
Pricing
A free, open-source reference server (part of the modelcontextprotocol/servers monorepo); PulseMCP ranks it #13 by popularity among all MCP servers (~6.1M visits).