What is gmail-mcp-server CLAUDE.md?

Project instructions for a TypeScript Gmail integration server. The server connects applications to Gmail and supports both multi-user HTTP requests and an older single-user command-line mode.

Use them when developing, testing, building, or containerising the Gmail server, or when working with its HTTP endpoint and OAuth access tokens.

They explain the project structure, development commands, testing, Docker usage, and how user Gmail access tokens are passed to the server. This reduces guesswork when changing or running the project.

How SepehrShapouri/gmail-mcp-server configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to SepehrShapouri/gmail-mcp-server. 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/SepehrShapouri/gmail-mcp-server/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/SepehrShapouri/gmail-mcp-server

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/sepehrshapouri/gmail-mcp-server/claude-md/github.svg)](https://agentmods.dev/instructions/sepehrshapouri/gmail-mcp-server/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/sepehrshapouri/gmail-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/sepehrshapouri/gmail-mcp-server/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/sepehrshapouri/gmail-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/sepehrshapouri/gmail-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,475 This file is loaded in full into every session.

When invoked 1,475 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.

Model	Per session	Once invoked
Fable 5.1	$0.01475	$0.01475
Opus 5.5	$0.00590	$0.00590
Sonnet 5.5	$0.00295	$0.00295
Haiku 4.5	$0.00147	$0.00147

Measured 2mo ago against content hash 0c55e9cc575f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gmail-mcp-server 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 2mo 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 · 172 lines

How it starts

The opening of the file, as written. The whole thing — 172 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.

Project Overview

This is a Gmail MCP (Model Context Protocol) HTTP Server that provides multi-tenant SaaS integration with the Gmail API. It operates in two modes:

Stateless HTTP Server (src/http-server.ts) - Multi-tenant mode where each request includes user OAuth tokens
Legacy Stdio Mode - Single-user mode with local credential storage

The HTTP server is the primary production mode, designed for integration into SaaS applications like n8n where multiple users need Gmail access.

Essential Commands

Development

npm run dev          # Run HTTP server in development mode with tsx
npm run build        # Compile TypeScript to dist/
npm run start        # Run compiled HTTP server
npm run test         # Run test suite against HTTP server

Docker

docker build -t mcp/gmail .
docker run -p 3001:3001 mcp/gmail

Architecture

Core Components

HTTP Server (src/http-server.ts) - Express server that:
- Accepts JSON-RPC requests at POST /mcp
- Extracts user OAuth tokens from headers (X-Google-Access-Token, X-Google-Refresh-Token) or Authorization: Bearer
- Creates per-request OAuth2Client and Gmail API instances
- Uses StreamableHTTPServerTransport in stateless mode (no session tracking)
- Returns JSON-RPC responses
Gmail Tools (src/gmail-tools.ts) - MCP tool implementations:
- All tools are Zod schemas converted to JSON Schema
- getToolDefinitions() returns tool list for MCP
- createToolHandler() returns async function that routes tool calls
- Handles email operations (send, draft, read, search, modify, delete)
- Manages attachments (send, receive, download)
- Batch operations for efficiency
Label Manager (src/label-manager.ts) - Gmail label CRUD:
- createLabel(), updateLabel(), deleteLabel()
- listLabels(), findLabelByName()
- getOrCreateLabel() - idempotent label creation

Read the full file on GitHub · 172 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.

2mo ago First seen · 172 lines · 1,475 tokens per session scan A 0c55e9cc575f

Subscribe to this mod's changes

gmail-mcp-server CLAUDE.md is an instructions file published in the GitHub repository SepehrShapouri/gmail-mcp-server (1 stars, last pushed 16d ago), licensed MIT. It adds 1,475 tokens to every session, about $0.0059 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 2026-08-31.

Backend and APIs

gmail-mcp-server CLAUDE.md next to 6 instructions from other repositories
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gmail-mcp-server: Instructions file for Claude Code