University Microsoft 365 Read-only MCP

University Microsoft 365 Read-only MCP

A read-only MCP server that exposes Outlook mailbox tools (list, search, get messages) for university Microsoft 365 via Power Automate, enabling secure querying of mailbox data without direct Graph authentication.

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README

microsoft-bypass-mcp

Microsoftアカウントのテナント管理者がAIサービス(ChatGPT, Claudeなど)との連携を承認していないときに、Power Automate経由でバイパスして情報を取得できるリモートMCPサーバー

Specification

Architecture

MCP Client
    ↓  MCP over Streamable HTTP (/mcp)
Remote MCP Server — Cloudflare Workers + Hono (Cloudflare Access OAuth)
    ↓  HTTP POST { operation, requestId, args }
Power Automate — operation allowlist → fixed Graph endpoints, M365 auth
    ↓
Microsoft Graph

Tools

Tool Input Output
outlook_list_messages { limit?: number } (default 5, 1–100) { messages: MessageSummary[] }
outlook_search_messages { query: string, limit?: number } (default 10, 1–100) { messages: MessageSummary[] }
outlook_get_message { messageId: string } MessageDetail

Requirements

  • Microsoftアカウント
  • Bun
  • Cloudflareアカウント

Configuration

.dev.vars.example に従ってPower Automate側のURLを参照

POWER_AUTOMATE_URL=https://prod-xxx.logic.azure.com/workflows/xxx/triggers/manual/paths/invoke

For production, set these as Worker secrets/vars (wrangler secret put).

Development

bun install
bun run dev          # local Worker (wrangler dev)

Quality checks

bun run typecheck    # tsc --noEmit
bun run lint         # oxlint
bun run lint:types   # oxlint --type-aware
bun run format:check # oxfmt --check
bun run test         # vitest

Deploy

bun run deploy       # wrangler deploy

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