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chatwork-mcp-server: Instructions file for Claude Code

CLAUDE.md

chatwork-mcp-server CLAUDE.md is an instructions file for Claude Code from chatwork/chatwork-mcp-server. It costs 670 tokens per session, scanned A, original, MIT.

Development instructions for an MCP server that connects AI tools to Chatwork, a workplace chat and task-management service. They describe the TypeScript build, tests, configuration, architecture, and available Chatwork operations.

In plain words
What is it for?
Use them when working on tools for Chatwork users, messages, chats, tasks, files, invitations, or contact requests.
Why use it?
They help an AI agent understand how to change the server safely and how to build, test, and type-check it.

Instructions file for Claude Code

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

This is chatwork/chatwork-mcp-server's own configuration. It tells Claude Code how to work on chatwork-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 chatwork-mcp-server configures →

not rated 52repo +1 17d ago A scan 670 tokens original MIT
View source ↗ chatwork/chatwork-mcp-server
Reuse

Borrowing it

Nothing to install: this file belongs to chatwork/chatwork-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/chatwork/chatwork-mcp-server/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/chatwork/chatwork-mcp-server

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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<a href="https://agentmods.dev/instructions/chatwork/chatwork-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/chatwork/chatwork-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 670 This file is loaded in full into every session.
When invoked 670 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 original No closer match found 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 $0.00670 $0.00670
Opus 5.5 $0.00268 $0.00268
Sonnet 5.5 $0.00134 $0.00134
Haiku 4.5 $0.00067 $0.00067

Measured 2mo ago against content hash c2e951f16f71, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

chatwork-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 2mo 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.

CLAUDE.md · 58 lines

What it actually says

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

開発コマンド

ビルドとテスト

  • npm run build - esbuildでTypeScriptを単一のESMファイルにバンドル
  • npm run dev - ビルドをwatch モードで実行（開発時）
  • npm run test - Vitestでテスト実行
  • npm run type-check - TypeScript型チェック
  • npm run lint - ESLint + Prettier チェック

環境設定

  • プロジェクトルートに .env.test ファイルが必要（Vitest用）
  • CHATWORK_API_TOKEN 環境変数が必要

アーキテクチャ概要

MCP サーバー実装

このプロジェクトは Chatwork API を Model Context Protocol (MCP) 経由で操作できるサーバーです。

主要コンポーネント

  • src/index.ts - エントリーポイント（StdioServerTransport でMCPサーバーを起動）
  • src/server.ts - MCPサーバー設定と全ツール定義（40個以上のChatwork操作）
  • src/chatworkClient.ts - Chatwork API v2 クライアント実装
  • src/schema.ts - Zod スキーマ定義（全APIエンドポイントのパラメータ検証）
  • src/toolCallbacks.ts - 各MCPツールの実装（APIコール→レスポンス変換）

提供機能

  • ユーザー情報（自分の情報、ステータス、タスク一覧、コンタクト一覧）
  • チャット管理（作成、取得、更新、削除/退席、メンバー管理）
  • メッセージ操作（一覧、投稿、既読/未読、取得、更新、削除）
  • タスク管理（一覧、作成、取得、ステータス更新）
  • ファイル管理（一覧、ファイル情報取得）
  • 招待リンク管理（取得、作成、更新、削除）
  • コンタクト承認依頼（一覧、承認、拒否）

データフロー

  1. MCP クライアント（Claude等）がツール呼び出し
  2. server.ts でツール定義とスキーマ検証
  3. toolCallbacks.ts でパラメータ処理
  4. chatworkClient.ts でChatwork API v2 呼び出し
  5. レスポンスをMCP形式に変換して返却

設定とデプロイ

  • npm パッケージとして @chatwork/mcp-server で公開
  • dist/index.js が実行可能バイナリ
  • ES2022 modules、bundler resolution使用
  • 厳密なTypeScript設定（@tsconfig/strictest）
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. 2mo ago First seen · 58 lines · 670 tokens per session scan A c2e951f16f71

Subscribe to this mod's changes

chatwork-mcp-server CLAUDE.md is an instructions file published in the GitHub repository chatwork/chatwork-mcp-server (52 stars, last pushed 17d ago), licensed MIT. It adds 670 tokens to every session, about $0.0027 per session on Opus 5.5. 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.

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