What is jmap-mcp CLAUDE.md?

Repository instructions for a Deno email server that lets coding agents work with JMAP, a standard for managing email through web requests. They list the project commands, checks, hooks and required connection settings.

Running the server and its tests, checking types, formatting and linting code, installing pre-commit and pre-push checks, and connecting to services such as FastMail, Cyrus IMAP or Stalwart.

They give the agent the project-specific rules in one place, so it knows how to run, check and publish the code and which settings the email connection needs.

How wyattjoh/jmap-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to wyattjoh/jmap-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.

Copy the file

curl -O https://raw.githubusercontent.com/wyattjoh/jmap-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/wyattjoh/jmap-mcp

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/wyattjoh/jmap-mcp/claude-md.svg)](https://agentmods.dev/instructions/wyattjoh/jmap-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/wyattjoh/jmap-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/wyattjoh/jmap-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,085 This file is loaded in full into every session.

When invoked 1,085 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	$0.01085	$0.01085
Opus 5	$0.00543	$0.00543
Sonnet 5	$0.00217	$0.00217
Haiku 4.5	$0.00109	$0.00109

Measured 8d ago against content hash 9009ca3b7463, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

jmap-mcp 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 8d 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 · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 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 Model Context Protocol (MCP) server that provides JMAP (JSON Meta Application Protocol) email management tools. It's built with Deno and integrates with JMAP-compliant email servers like FastMail, Cyrus IMAP, and Stalwart Mail Server.

Development Commands

deno task start - Run the MCP server
deno task watch - Run with file watching
deno check - Type-check the project
deno fmt - Format code (excludes CHANGELOG.md)
deno lint - Lint the project
deno test --allow-env --allow-net - Run all tests
deno test --allow-env --allow-net src/tools/email_test.ts - Run a single test file
deno publish --dry-run --allow-dirty - Validate JSR publish

Pre-commit Hooks

Run deno task hooks:install to set up git hooks. Pre-commit runs deno check && deno fmt --check && deno lint. Pre-push runs deno publish --dry-run --allow-dirty.

Required Environment Variables

JMAP_SESSION_URL="https://your-jmap-server.com/.well-known/jmap"
JMAP_BEARER_TOKEN="your-bearer-token"
JMAP_ACCOUNT_ID="account-id"  # Optional, auto-detected if not provided

Architecture

Core Structure

Entry point: src/mod.ts - MCP server setup, JMAP client initialization, and tool registration
Tool modules: src/tools/ - Modular tool implementations
- email.ts - Email search, retrieval, mailbox management, and basic operations
- submission.ts - Email composition and sending (when JMAP submission capability is available)
Utilities: src/utils.ts - Common utilities like error formatting

Key Design Patterns

Functional programming style - Functions are pure where possible, side effects are contained
Runtime validation - All inputs validated with Zod schemas before processing
Capability-based registration - Tools are registered based on JMAP server capabilities (checked in mod.ts via session.capabilities)
Graceful degradation - Server adapts to read-only accounts and limited JMAP capabilities

Read the full file on GitHub · 120 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.

8d ago First seen · 120 lines · 1,085 tokens per session scan A 9009ca3b7463

Subscribe to this mod's changes

jmap-mcp CLAUDE.md is an instructions file published in the GitHub repository wyattjoh/jmap-mcp (176 stars, last pushed 4d ago), licensed MIT. It adds 1,085 tokens to every session, about $0.0054 per session on Opus 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 2026-08-30.

Backend and APIs

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AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

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vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

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jmap-mcp: Instructions file for Claude Code