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hayatosc

University Microsoft 365 Read-only MCP

by hayatosc
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TypeScript
Remote

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, 1–50)

{ messages: MessageSummary[], hasMore: boolean }

outlook_search_messages

{ query: string, limit?: number } (default 10, 1–50)

{ messages: MessageSummary[], hasMore: boolean }

outlook_get_message

{ messageId: string }

MessageDetail

Related MCP server: M365 MCP

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
POWER_AUTOMATE_GATEWAY_KEY=<gateway key>

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

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivitySlowing
ResponsivenessNo issues

Resources

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