Sequential Thinking MCP Server

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Dynamic, reflective problem-solving through thought sequences.

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Publisher

Anthropic

License

MIT

Transport

Local subprocess

Tools

1

What this server does

Force the model into multi-step reasoning instead of a one-shot answer. The single tool, `sequential_thinking`, gets called repeatedly while the model works a problem, passing a thought, a thought number, an estimated total, and a `nextThoughtNeeded` boolean on each call. Revisions reference an earlier thought via `isRevision: true` and `revisesThought: N`. Branches fork with a `branchId`. The server does not reason itself; it is scaffolding that makes the chain of thought visible to the host. Why this matters: instruction-tuned models commit to a plan in the first paragraph and defend it. Marking a step as a revision is a signal to both the model and any inspector that the reasoning changed. For planning, migrations, ambiguous bug hunts, or 'compare three options' prompts, the structured shape produces more useful work than a single dense reply. The catch is latency and token cost. Each thought is a separate tool call. A five-step plan is five round trips. For trivial questions, this is overhead with no payoff; for genuinely multi-step problems, the visible chain of thought is the value. Set `DISABLE_THOUGHT_LOGGING=true` if you do not want thoughts written to stderr (useful when screen-sharing or piping logs somewhere). Available via `uvx`, npx, and Docker. The Docker image is `mcp/sequentialthinking`.

Tools included

  • sequentialthinking

    Decompose a problem into ordered thought steps with optional revision and branching.

The authoritative list comes from the server's tools/list at runtime. This catalog entry may lag the upstream until the next ToolPiper release.

Install in ToolPiper

ToolPiper handles the JSON configuration. Click Install, fill in any required tokens, and the server is ready in your chat.

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Install in another client

Install in another MCP client (Claude Desktop, Cursor, Continue, Cline)

Add this to ~/Library/Application Support/Claude/claude_desktop_config.json.

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

Example prompts

  • "Plan a Postgres 14 to 16 migration. Revise the plan if downtime exceeds 5 minutes."

  • "Debug why this deploy only fails in production. Show your reasoning step by step."

  • "Compare three architectures for a file sync engine. Branch if an assumption fails."

  • "Walk through this race condition one possibility at a time and rule each out."

Security notes

Zero network access. The server runs locally and does not touch files or external APIs. The only side effect is logging thought content to stderr unless `DISABLE_THOUGHT_LOGGING=true` is set, which matters if you screen-share or if your shell captures stderr to a log. Thoughts can contain whatever the model is reasoning about, including sensitive context from earlier in the chat. Treat the log the same way you treat the chat itself. No env vars carry credentials. No tokens to rotate.

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