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Sequential Thinking
Gives a model a scratchpad for multi step reasoning, letting it revise earlier steps instead of committing to a first answer.
What it does
Provides a tool the model calls to think in numbered steps, branch, and revise. Each thought is a tool call, so the reasoning is explicit and inspectable rather than buried in one long response.
An official reference server.
Setup
claude mcp add sequential-thinking -- npx -y @modelcontextprotocol/server-sequentialthinking
What to watch out for
Reasoning models already do this internally. If you are on a model with built in extended thinking, this server mostly duplicates what the model does for free, and it costs a tool call round trip per thought.
The clearest use is when you want the reasoning visible in the transcript, for auditing or for teaching, rather than when you want better answers.
It can be slow. Each step is a separate call.
