What is nucleus-apple-mcp AGENTS.md?

Repository instructions for a Python MCP server that connects Apple calendar and reminder features through a Swift sidecar, a small helper program written in Apple’s Swift language. They describe the server structure, native helper, build commands, and macOS requirements.

Use them when working on calendar or reminder tool routers, the Swift helper, local setup, or tests. They also guide smoke-testing the helper and managing its cache location.

They show how the Python and Swift parts fit together and explain that the helper is compiled and cached on its first run. This reduces setup mistakes when developing on macOS.

How zish-rob-crur/nucleus-apple-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to zish-rob-crur/nucleus-apple-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/zish-rob-crur/nucleus-apple-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/zish-rob-crur/nucleus-apple-mcp

Made for: Codex, OpenCode.

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/zish-rob-crur/nucleus-apple-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/zish-rob-crur/nucleus-apple-mcp/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/zish-rob-crur/nucleus-apple-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/zish-rob-crur/nucleus-apple-mcp/agents-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/zish-rob-crur/nucleus-apple-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/zish-rob-crur/nucleus-apple-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 631 This file is loaded in full into every session.

When invoked 631 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	$0.00631	$0.00631
Opus 5	$0.00316	$0.00316
Sonnet 5	$0.00126	$0.00126
Haiku 4.5	$0.00063	$0.00063

Measured 11d ago against content hash 23df910df1d4, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

nucleus-apple-mcp AGENTS.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 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.

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.

AGENTS.md · 44 lines

How it starts

The opening of the file, as written. The whole thing — 44 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Repository Guidelines

Project Structure & Module Organization

src/nucleus_apple_mcp/: Python MCP server (FastMCP). Entry points: __main__.py, mcp_app.py.
src/nucleus_apple_mcp/tools/: MCP tool routers (e.g., calendar.py, reminders.py).
src/nucleus_apple_mcp/sidecar/: Python helpers to build/run the native sidecar and manage caching.
src/nucleus_apple_mcp/sidecar/swift/: SwiftPM package for the nucleus-apple-sidecar executable (EventKit).
docs/specs/: Notes/specs for tool behavior and payload shapes.

Build, Test, and Development Commands

Prereqs: macOS 12+, Python >=3.10, and Xcode Command Line Tools (Swift).

uv sync: Create/update the local virtual environment from uv.lock.
uv run nucleus-apple-mcp (or python -m nucleus_apple_mcp): Run the MCP server over stdio.
just --list: Show available Swift sidecar dev commands.
just sidecar-run: Run a basic sidecar “ping” smoke test.
just sidecar-help: Show the sidecar CLI help (ArgumentParser).

The first server run compiles the Swift sidecar and caches it under ~/Library/Caches/nucleus-apple-mcp/… (override with NUCLEUS_APPLE_MCP_CACHE_DIR). You can also set NUCLEUS_SWIFT / NUCLEUS_SWIFTC to override toolchain paths.

Coding Style & Naming Conventions

Python: 4-space indentation; prefer type hints; keep modules/functions snake_case and classes CapWords.
Swift: follow Swift API Design Guidelines; keep CLI JSON responses stable and backward compatible.
Avoid committing generated artifacts (e.g., .venv/, __pycache__/, Swift .build/ outputs).

Testing Guidelines

There is no automated test suite in this repository yet. For validation:

Run uv run nucleus-apple-mcp and exercise tools via an MCP client (Calendar/Reminders permissions required).
Run relevant sidecar commands via just (e.g., just sidecar-run, just sidecar "echo --payload '{\"x\":2}'").

If you add tests, use pytest and place them under a top-level tests/ directory with test_*.py naming.

Read the full file on GitHub · 44 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.

11d ago First seen · 44 lines · 631 tokens per session scan A 23df910df1d4

Subscribe to this mod's changes

nucleus-apple-mcp AGENTS.md is an instructions file published in the GitHub repository zish-rob-crur/nucleus-apple-mcp (20 stars, last pushed 6d ago), licensed MIT. It adds 631 tokens to every session, about $0.0032 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.

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