ToolPlan MCP

Turn a raw project idea into a polished, cost-aware first prompt for any AI coding agent.

Why

Models pick tech stacks decently — but they:

1. Under-recommend high-leverage open-source tools. Niche skills, scrapers, and community tools from GitHub/Reddit (Agent-Reach, caveman, karpathy-guidelines, ...) save hours, and models rarely surface them unprompted. Programmers who don't track this ecosystem lose that time.

2. Never apply cost-saving techniques on their own. Subagent delegation, plan-first execution, task-by-task verification — models don't do these unless told, and casual users don't know to ask. Result: millions of wasted tokens.

3. Do better with a structured first prompt. A polished brief with stack, constraints, and done-criteria makes a project far more one-shotable — even on non-frontier models.

ToolPlan packages all three into one MCP tool call.

Related MCP server: PromptArchitect MCP

How it works

your raw idea ──▶ plan_project(idea, grade) ──▶ enriched prompt
                        │
                  reads curated KB (kb/*.yaml):
                  stacks · tools · MCPs · skills · directives
                  each with why_models_miss_it + cost_profile

No live scraping at runtime — a weekly offline pipeline proposes KB updates as human-reviewed diffs, so advice stays current without hype pollution.

Quick start (Claude Code)

claude mcp add toolplan -- npx -y toolplan-mcp

Then either:

• /toolplan <your idea> — copy commands/toolplan.md (shipped in the npm package) to ~/.claude/commands/ first. The agent calls the tool, shows you the refined prompt verbatim, and waits for you to proceed, edit, or regenerate — it never starts building on its own.

• /mcp__toolplan__plan — zero-install; Claude Code auto-exposes the server's built-in plan prompt as a slash command.

• Or just ask in chat: "Use plan_project with my idea: an app that tracks freelance invoices, grade personal."

Other hosts (Cursor, Codex CLI, any stdio MCP host): see docs/HOST_SETUP.md.

Tool API

plan_project(idea: string, grade: "industry" | "personal", tags?: string[]) → markdown enriched prompt: project brief, recommended stack, tools you'd likely miss, execution directives, quality bar, sources.

Knowledge base

One YAML file per entry under kb/<category>/. Format: docs/KB_SCHEMA.md. Contributions welcome — PRs must pass the eval regression suite.

Privacy note: running the tool never phones home. The KB is read-only at runtime and bundled with the package; nobody's usage updates it. Optional TOOLPLAN_LOG writes usage lines to a local file you control.

Improving the KB

Three ways, smallest first:

1. Add one entry by hand. Copy an existing YAML in kb/<category>/, fill the fields honestly (especially why_models_miss_it), run npm test && npm run eval, open a PR.

2. Mine your own usage. Set TOOLPLAN_LOG=toolplan.jsonl in the server env, use the tool for a while, then npm run log-to-case toolplan.jsonl — real ideas become eval-case skeletons; weak matches show you exactly which keywords the KB is missing.

3. Run the weekly refresh. Point a Claude agent at pipeline/REFRESH.md; it researches new tools and writes proposals to pipeline/proposals/<date>/ with evidence. You review PROPOSAL.md, move accepted files into kb/, run npm test && npm run eval, commit.

Staleness check anytime: npm run stale.

Development

npm install
npm run build
npm test
npm run smoke   # end-to-end stdio call against the built server

Status

v1: web-application scope only. See PLAN.md for roadmap (eval harness, refresh pipeline, host adapters).