How to Connect freeeサイン to an AI Agent
Auth setup
1. freee API設定 > アプリ登録 (sign権限を含む). 2. OAuth認証フロー. 3. freee会計と同一のaccess_tokenでsign APIも利用可能（スコープ設定による）.
Key facts
| Base URL | https://api.freee.co.jp/sign/v1/ |
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| API version | v1 |
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| Auth | OAuth 2.0 via freee共通認証基盤. freee会計と同じOAuthフロー. |
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| Token URL | https://accounts.secure.freee.co.jp/public_api/token |
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| Scopes | sign:read, sign:write |
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| Request body | application/json |
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| Pagination | offset + limit. |
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| Rate limit | 300 req/5min (freee共通). |
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| Error format | JSON: {"errors":[{"type":"...","messages":["..."]}]} |
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Key endpoints
| Method | Path | Description |
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GET | /contracts | List contracts (契約一覧) |
POST | /contracts | Create a contract for signing |
GET | /contracts/{id}/pdf | Download signed contract PDF |
POST | /contracts/{id}/send | Send contract for signature |
Quickstart
GET /sign/v1/contracts?limit=10
Authorization: Bearer {access_token}
Response: {"contracts":[{"id":1,"title":"業務委託契約書","status":"signed",...}]}
Agent pitfalls & tips
- freee会計と認証基盤が共通 — 1つのOAuthアプリでsignも利用可能.
- CloudSignの競合 — freeeエコシステム内での電子署名.
- 契約ステータス: draft → sent → signed → completed.
- PDF出力はバイナリ — Content-Disposition headerでファイル名取得.
- freee会計の取引データと自動連携可能.
Source: curated by KanseiLink from official documentation (docs) and registry checks. Last reviewed: 2026-04-07. Specs change — verify against the official docs before production use.
Frequently Asked Questions
What is freeeサイン's AEO score?
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freeeサイン has an AEO score of 0.60 and is rated BBB (Basic agent connectivity available). AEO (Agent Engine Optimization) measures how well a SaaS service works with AI agents. Scores range from 0.00 to 1.00, with grades from AAA (best) to D (not agent-ready).
Is freeeサイン AI-agent-ready?
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freeeサイン is currently connectable for AI agent use. API access is available but no dedicated MCP server has been published yet. For detailed connection guides, auth setup, and known pitfalls, use the KanseiLink MCP tool.
How does freeeサイン compare to other Legal & Contracts services?
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In the Legal & Contracts category, freeeサイン is rated BBB. KanseiLink evaluates services based on MCP availability, API quality, documentation, auth-guide clarity, and integration recipe availability (methodology published). Visit the full rankings at kansei-link.com to see how freeeサイン compares.
How can I integrate freeeサイン with an AI agent?
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The fastest way to integrate freeeサイン with an AI agent is through KanseiLink MCP. Install it with: npx @kansei-link/mcp-server — then use the search_services and get_service_detail tools to get the current auth setup, endpoints, rate limits, and agent-specific tips. This data is kept fresh from registry checks, curated official-doc guides, and agent reports.
How do I authenticate with freeeサイン?
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OAuth 2.0 via freee共通認証基盤. freee会計と同じOAuthフロー. Setup: 1. freee API設定 > アプリ登録 (sign権限を含む). 2. OAuth認証フロー. 3. freee会計と同一のaccess_tokenでsign APIも利用可能（スコープ設定による）.
What are freeeサイン's API rate limits?
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300 req/5min (freee共通).