What is imessage-mcp CLAUDE.md?

Repository instructions for a Deno workspace monorepo, meaning one repository that contains multiple related packages. They document commands for the iMessage library and its Model Context Protocol server, a program that lets an AI tool access the library.

Use them when developing or checking the iMessage packages, running the server locally, watching it during development, or publishing the packages to JSR.

They provide the correct commands for formatting, linting, type checking, testing, running, and publishing both packages.

How wyattjoh/imessage-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to wyattjoh/imessage-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/imessage-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/wyattjoh/imessage-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/imessage-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/wyattjoh/imessage-mcp/claude-md)

Your own site

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

Your own site · 80×15

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

Per session 1,141 This file is loaded in full into every session.

When invoked 1,141 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	$0.01141	$0.01141
Opus 5.5	$0.00456	$0.00456
Sonnet 5.5	$0.00228	$0.00228
Haiku 4.5	$0.00114	$0.00114

Measured 2mo ago against content hash 63afc45934a7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

imessage-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 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 · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 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.

Development Commands

This is a Deno workspace monorepo with two packages:

packages/imessage - Core library for iMessage database access
packages/imessage-mcp - MCP server implementation

Root Commands (affects all packages)

# Cache dependencies for all packages
deno cache packages/*/mod.ts

# Code quality (runs on all packages)
deno task fmt     # Format all code
deno task lint    # Lint all packages
deno task check   # Type check all TypeScript files

# Run tests
deno task test

# Publish packages to JSR (CI/CD)
deno publish

Package-Specific Commands

# Run the MCP server
cd packages/imessage-mcp
deno run --allow-read --allow-env --allow-sys --allow-ffi mod.ts

# Development with file watching
cd packages/imessage-mcp
deno run --allow-read --allow-env --allow-sys --allow-ffi --watch mod.ts

# Test the core library
cd packages/imessage
deno test --allow-read --allow-env --allow-ffi --allow-sys=homedir

Architecture Overview

This monorepo contains a Model Context Protocol (MCP) server and core library that provide read-only access to the macOS iMessage database. The codebase follows functional programming principles with no classes.

Package Structure

@wyattjoh/imessage (packages/imessage/)
- Core library for iMessage database access
- Database operations, type definitions, and utilities
- No MCP dependencies - can be used standalone
@wyattjoh/imessage-mcp (packages/imessage-mcp/)
- MCP server implementation
- Imports and uses the core library
- Provides LLM-accessible tools

Core Components

MCP Server Layer (packages/imessage-mcp/src/index.ts)
- Creates MCP server instance using @modelcontextprotocol/sdk
- Defines 6 tools with Zod schemas for validation
- Uses StdioServerTransport for communication
- Lazy database initialization pattern

Read the full file on GitHub · 125 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 · 125 lines · 1,141 tokens per session scan A 63afc45934a7

Subscribe to this mod's changes

imessage-mcp CLAUDE.md is an instructions file published in the GitHub repository wyattjoh/imessage-mcp (29 stars, last pushed 2mo ago), licensed MIT. It adds 1,141 tokens to every session, about $0.0046 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 2026-08-30.

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imessage-mcp: Instructions file for Claude Code