Borrowing it
Nothing to install: this file belongs to rumbitopi/mail-cal-drive-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.
curl -O https://raw.githubusercontent.com/rumbitopi/mail-cal-drive-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/rumbitopi/mail-cal-drive-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/rumbitopi/mail-cal-drive-mcp/claude-md)<a href="https://agentmods.dev/instructions/rumbitopi/mail-cal-drive-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/rumbitopi/mail-cal-drive-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>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.
<a href="https://agentmods.dev/instructions/rumbitopi/mail-cal-drive-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/rumbitopi/mail-cal-drive-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.01215 | $0.01215 |
| Opus 5 | $0.00607 | $0.00607 |
| Sonnet 5 | $0.00243 | $0.00243 |
| Haiku 4.5 | $0.00121 | $0.00121 |
Grade A, and why
mail-cal-drive-mcp CLAUDE.md scanned grade A with 1 finding 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 11d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://localhost:3100/health How it starts
The opening of the file, as written. The whole thing — 156 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Workspace MCP Server - Project Instructions
Project Overview
Self-hosted MCP server for multi-account email, calendar, and cloud storage management. Runs in Docker with local Postgres for persistent credential and token storage.
Stack: Node.js 20+, TypeScript 5.4+, Express, MCP SDK, Postgres Providers: Microsoft 365, Google Workspace, IMAP Transport: Streamable HTTP on port 3100
Development Commands
# Install dependencies
npm install
# Start Postgres + MCP server (Docker)
docker compose up --build
# Development with hot reload (requires local Postgres)
npm run dev
# Build TypeScript
npm run build
# Production start (requires local Postgres)
npm start
# Run tests
npm test
# Type check
npm run typecheck
# Migrate credentials from old local files to Postgres
DATABASE_URL=... CREDENTIAL_ENCRYPTION_KEY=... npm run migrate
Key Files
| File | Purpose |
|---|---|
src/index.ts |
Entry point |
src/server.ts |
Express server setup |
src/mcp/handler.ts |
MCP request routing (session-based) |
src/auth/storage.ts |
Credential storage (Postgres-backed) |
src/storage/postgres.ts |
Postgres client + encrypted CRUD |
src/storage/msal-cache.ts |
MSAL cache plugin (Postgres) |
src/storage/pending-flows.ts |
Pending auth flow storage |
src/providers/ |
Provider implementations |
src/mcp/tools/ |
MCP tool definitions (36 tools) |
Environment Variables
Required in .env:
POSTGRES_PASSWORD=<password>
DATABASE_URL=postgresql://mcp:<password>@localhost:5432/workspace_mcp
CREDENTIAL_ENCRYPTION_KEY=<64-hex-chars>
API_KEY=<min-32-chars>
# Microsoft 365 (optional)
MS_ENABLED=true
MS_CLIENT_ID=
MS_TENANT_ID=common
# Google (optional)
GOOGLE_ENABLED=true
GOOGLE_CLIENT_ID=
GOOGLE_CLIENT_SECRET=
GOOGLE_REDIRECT_URI=http://localhost:3100/auth/google/callback
# IMAP (optional)
IMAP_ENABLED=true
Architecture
- Docker Compose: Postgres 16 + Node.js MCP server
- All sensitive data encrypted at rest: Credentials, MSAL cache, and pending auth flows encrypted with AES-256-GCM before Postgres storage
- Sessions in memory: Max 100, 30-min TTL, auto-evicted. Lost on restart (clients auto-reconnect)
- Ports bound to 127.0.0.1: Not accessible from other machines
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.
- 11d ago First seen · 156 lines · 1,215 tokens per session scan A 0195c83a55e5
mail-cal-drive-mcp CLAUDE.md is an instructions file published in the GitHub repository rumbitopi/mail-cal-drive-mcp (1 stars, last pushed 4mo ago), licensed MIT. It adds 1,215 tokens to every session, about $0.0061 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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