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freee-mcp: Instructions file for Claude Code

CLAUDE.md

freee-mcp CLAUDE.md is an instructions file for Claude Code from freee/freee-mcp. It costs 3,117 tokens per session, scanned A, original, Apache-2.0.

Repository instructions for freee-mcp, an MCP server that exposes freee accounting, payroll, invoicing, project-management, and sales APIs as tools for AI assistants.

In plain words
What is it for?
Use it when building, checking, testing, debugging, versioning, or releasing freee-mcp.
Why use it?
It gives contributors the exact commands, project structure, and release process needed to safely change and publish the server.

Instructions file for Claude Code

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

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

not rated 509repo +1 changed 1mo ago A scan 3,117 tokens original Apache-2.0
View source ↗ freee/freee-mcp freee.co.jp
Reuse

Borrowing it

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

Made for: Claude Code.

Wrote this? Show the measurements

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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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Per session 3,117 This file is loaded in full into every session.
When invoked 3,117 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 $0.03117 $0.03117
Opus 5.5 $0.01247 $0.01247
Sonnet 5.5 $0.00623 $0.00623
Haiku 4.5 $0.00312 $0.00312

Measured 1mo ago against content hash 30945d34ab3b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

freee-mcp 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 1mo 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 · 179 lines

How it starts

The opening of the file, as written. The whole thing — 179 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

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

Commands

  • bun run build - Build the project (uses Bun.build)
  • bun run typecheck - TypeScript type checking
  • bun run lint - Run Biome linter
  • bun run format - Run Biome formatter
  • bun run check - Run Biome lint + format (recommended before PR)
  • bun run test:run - Run tests (vitest)
  • bun run dev - Start development server
  • bun run inspector - MCP inspector for debugging tools
  • bun run changeset - Create a new changeset for version bumps
  • bun run version - Apply changesets to update versions and CHANGELOG
  • bun run release - Build and publish to npm
  • bun run count:apis - Count operations/paths per OpenAPI schema (--json for machine-readable output)

Architecture

MCP server that exposes freee API endpoints as MCP tools:

  • Schema: Multiple OpenAPI schemas in openapi/ directory
  • Schema Loader: src/openapi/schema-loader.ts loads and manages all API schemas
  • Tool Generation: generateClientModeTool() in src/openapi/client-mode.ts creates method-specific tools
    • Tools: freee_api_get, freee_api_post, freee_api_put, freee_api_delete, freee_api_patch, freee_api_list_paths
    • Automatically detects API type from path and uses correct base URL
    • Validates paths against all OpenAPI schemas before execution
    • Supports all 5 freee APIs seamlessly
  • Requests: makeApiRequest() in src/api/client.ts handles API calls with auto-auth and company_id injection

Read the full file on GitHub · 179 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. 1mo ago Changed · +6 lines · +182 tokens per session 30945d34ab3b
  2. 1mo ago Changed · +1 lines · +93 tokens per session 3246cc591605
  3. 1mo ago First seen · 172 lines · 2,842 tokens per session scan A bf33b09d1e3f

Subscribe to this mod's changes

freee-mcp CLAUDE.md is an instructions file published in the GitHub repository freee/freee-mcp (509 stars, last pushed yesterday), licensed Apache-2.0. It adds 3,117 tokens to every session, about $0.0125 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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