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notion-mcp-server: Instructions file for Claude Code

CLAUDE.md

notion-mcp-server CLAUDE.md is an instructions file for Claude Code from mieubrisse/notion-mcp-server. It costs 580 tokens per session, scanned A, a copy of notion-mcp-server CLAUDE.md, MIT.

A Claude Code instruction file for a server that exposes the Notion API to coding assistants through MCP, a standard tool-connection protocol. It documents the project structure and explains how OpenAPI definitions become assistant tools.

In plain words
What is it for?
Understanding the Notion MCP server, adding or changing Notion API endpoints through its OpenAPI file, and following its development patterns.
Why use it?
It tells Claude how the server is organized and where to make changes, reducing the risk of editing generated code instead of the API specification.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is mieubrisse/notion-mcp-server's own configuration. It tells Claude Code how to work on notion-mcp-server itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything notion-mcp-server configures →

not rated 0repo 6mo ago A scan 580 tokens copy · 100% MIT
View source ↗ mieubrisse/notion-mcp-server
Reuse

Borrowing it

Nothing to install: this file belongs to mieubrisse/notion-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/mieubrisse/notion-mcp-server/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/mieubrisse/notion-mcp-server

Made for: Claude Code.

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Per session 580 This file is loaded in full into every session.
When invoked 580 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00580 $0.00580
Opus 5 $0.00290 $0.00290
Sonnet 5 $0.00116 $0.00116
Haiku 4.5 $0.00058 $0.00058

Measured 8d ago against content hash 7320c27269b8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

notion-mcp-server CLAUDE.md 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 8d 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.

Origin

This is a copy

100% identical to notion-mcp-server CLAUDE.md — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 68 lines

How it starts

The opening of the file, as written. The whole thing — 68 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance for Claude Code when working with this repository.

Project Overview

This is the Notion MCP Server - an MCP (Model Context Protocol) server that exposes the Notion API as MCP tools. It auto-generates tools from an OpenAPI specification.

Architecture

scripts/notion-openapi.json    # OpenAPI spec (source of truth for all tools)
        ↓
src/init-server.ts             # Loads & validates spec, creates MCPProxy
        ↓
src/openapi-mcp-server/
├── openapi/parser.ts          # Converts OpenAPI → MCP tools
├── mcp/proxy.ts               # Registers tools with MCP server
└── client/http-client.ts      # Executes API calls

Key Patterns

Adding New Endpoints

Only modify scripts/notion-openapi.json. Tools are auto-generated from the spec - no code changes needed elsewhere.

Tool Generation Flow

  1. OpenAPIToMCPConverter.convertToMCPTools() iterates all paths/operations
  2. Each operation becomes an MCP tool (name = operationId)
  3. Parameters + requestBody → inputSchema
  4. Response schema → returnSchema
  5. MCPProxy.setupHandlers() registers tools with the MCP SDK

Naming Conventions

  • Tool names come from OpenAPI operationId (e.g., retrieve-a-database)
  • Names are truncated to 64 chars and converted to title case for display

Common Commands

npm run build      # TypeScript compilation + CLI bundling
npm test           # Run vitest tests
npm run dev        # Start dev server with hot reload

File Structure

  • scripts/notion-openapi.json - OpenAPI 3.1.0 spec defining all Notion API endpoints
  • scripts/start-server.ts - Entry point
  • src/init-server.ts - Server initialization
  • src/openapi-mcp-server/ - Core MCP server implementation
    • openapi/parser.ts - OpenAPI to MCP conversion (529 lines)
    • mcp/proxy.ts - MCP tool registration and execution (209 lines)
    • client/http-client.ts - HTTP request execution (198 lines)

Read the full file on GitHub · 68 lines

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.

  1. 8d ago First seen · 68 lines · 580 tokens per session scan A 7320c27269b8

Subscribe to this mod's changes

notion-mcp-server CLAUDE.md is an instructions file published in the GitHub repository mieubrisse/notion-mcp-server (0 stars, last pushed 6mo ago), licensed MIT. It adds 580 tokens to every session, about $0.0029 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to notion-mcp-server CLAUDE.md, differing in 0 lines, and is treated as a copy.

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