What is sequential-thinking?

A local MCP tool that helps an agent break a problem into ordered, revisable reasoning steps. MCP, or Model Context Protocol, is a standard for connecting agents to tools.

Use it for problems that benefit from explicit step-by-step thinking, especially when later steps depend on earlier conclusions.

It provides a place to structure complex work into steps that can be reconsidered as new information appears. This can make multi-part reasoning easier to follow and revise.

sequential-thinking — MCP server by happier-dev

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add mcp/happier-dev/happier/stack-sequential-thinking

Clone the repo

git clone --depth 1 https://github.com/happier-dev/happier

Made for: Claude Code, Codex, Cursor, Gemini CLI, OpenCode.

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

sequential-thinking scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

apps/stack/.mcp.json · 10 lines

What it actually says

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

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2d ago First seen · 10 lines scan A a5522eb546e7

Subscribe to this mod's changes

sequential-thinking is an MCP server published in the GitHub repository happier-dev/happier (1,593 stars, last pushed 2d ago), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Data and AI ai-agents claude claude-code codex gemini kimi

sequential-thinking

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

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