imessage-mcp-server: Instructions file for Gemini CLI

GEMINI.md

imessage-mcp-server GEMINI.md is an instructions file for Gemini CLI from genericService/imessage-mcp-server. It costs 533 tokens per session, scanned A, original, MIT.

Project instructions for developing an iMessage MCP server, including test-driven development and schema-driven development. Test-driven development means writing a failing test first, then implementing the change and cleaning it up; schema-driven development means defining data formats before relying on them.

In plain words
What is it for?
Use them when adding or changing message parsing, tool argument handling, API routes, or payload schemas, with tests and a TypeScript build run after changes.
Why use it?
They create a repeatable way to change the server and verify it after each change. They also make tool inputs, messages, API routes, and outputs follow explicit data definitions.

Instructions file for Gemini CLI

Written for Gemini CLI: the file is GEMINI.md.

This is genericService/imessage-mcp-server's own configuration. It tells Gemini CLI how to work on imessage-mcp-server itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything imessage-mcp-server configures →

Reuse

Borrowing it

Nothing to install: this file belongs to genericService/imessage-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/genericService/imessage-mcp-server/main/GEMINI.md
Clone the repo
git clone --depth 1 https://github.com/genericService/imessage-mcp-server

Made for: Gemini CLI.

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Per session 533 This file is loaded in full into every session.
When invoked 533 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00533 $0.00533
Opus 5.5 $0.00213 $0.00213
Sonnet 5.5 $0.00107 $0.00107
Haiku 4.5 $0.00053 $0.00053

Measured 1mo ago against content hash 7abc0cda0d85, 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-server GEMINI.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 1mo 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.

GEMINI.md · 41 lines

How it starts

The opening of the file, as written. The whole thing — 41 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project Rules: iMessage MCP Server

Pop-Culture Franchise Placeholders

  • Franchise: Dune (e.g., Arrakis, Paul Atreides, Fremen, Caladan, Harkonnen, CHOAM, Spice Melange).

1. Test-Driven Development (TDD) Protocol

  • Red-Green-Refactor Cycle:
    1. Red: Write a failing test in tests/ defining expected component or API contract behavior before modifying or adding implementation code.
    2. Green: Write minimal implementation code necessary to satisfy test assertions.
    3. Refactor: Clean up implementation code while ensuring all tests continue to pass.
  • Mandatory Test Verification:
    • Run pnpm test (Vitest) and pnpm build (tsc) after every code change.
    • Never declare a feature or refactor complete without verifying passing automated tests.
  • Test Scoping:
    • Unit tests for tool argument parsing, binary message parsing (parse_attributed_body), and payload schema outputs.
    • Integration tests for Express routes (/health, /discover, /mcp, /sse).

2. Schema-Driven Development (SDD) Protocol

  • Schema as Single Source of Truth:
    • All MCP tool signatures, request payloads, and API outputs must be formally defined as explicit JSON schemas or TypeScript interfaces in TOOLS within src/index.ts.
    • Runtime validation must strictly match published schema signatures.
  • Contract Driven API Endpoints:
    • /discover endpoint output must be derived dynamically from the canonical TOOLS array schema to ensure documentation and runtime contracts never drift.
    • Any parameter change in TOOLS must update corresponding CLI interface specifications and unit tests.
  • Input Boundary Sanitization:
    • Validate all input parameters (e.g. limit, days, chat, query, recipient, path) at entry point using strict boundary checks before executing CLI subcommands.

3. General Development Standards

  • Package Manager: pnpm ONLY. Use pnpm install, pnpm run, pnpm add.
  • Node.js Engine: >=24.0.0 (Active LTS). Enforced via package.json.
  • Imports: Absolute imports or relative ESM imports with .js extensions as required by NodeNext module resolution.

Read the full file on GitHub · 41 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.

  1. 1mo ago First seen · 41 lines · 533 tokens per session scan A 7abc0cda0d85

Subscribe to this mod's changes

imessage-mcp-server GEMINI.md is an instructions file published in the GitHub repository genericService/imessage-mcp-server (0 stars, last pushed 16d ago), licensed MIT. It adds 533 tokens to every session, about $0.0021 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.

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