Borrowing it
Nothing to install: this file belongs to EgorKurito/apple-calendar-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.
curl -O https://raw.githubusercontent.com/EgorKurito/apple-calendar-mcp/master/CLAUDE.mdgit clone --depth 1 https://github.com/EgorKurito/apple-calendar-mcpWrote 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.
[](https://agentmods.dev/instructions/egorkurito/apple-calendar-mcp/claude-md)<a href="https://agentmods.dev/instructions/egorkurito/apple-calendar-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/egorkurito/apple-calendar-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.
<a href="https://agentmods.dev/instructions/egorkurito/apple-calendar-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/egorkurito/apple-calendar-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00890 | $0.00890 |
| Opus 5 | $0.00445 | $0.00445 |
| Sonnet 5 | $0.00178 | $0.00178 |
| Haiku 4.5 | $0.00089 | $0.00089 |
Grade A, and why
apple-calendar-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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 79 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
Apple Calendar MCP server — an MCP server for Apple Calendar via the native EventKit API. Solves the problem of incorrect recurring event handling in the AppleScript approach. Two-layer architecture: TypeScript MCP server calls a Swift CLI binary (apple-bridge) via execa.
Build & Run
# Full build (Swift + TypeScript)
./scripts/build.sh
# Swift bridge only
cd swift && swift build -c release && codesign --force --sign - --entitlements apple-bridge.entitlements .build/release/apple-bridge
# TypeScript only
npm run build # tsc → build/
# Verify Swift binary
swift/.build/release/apple-bridge doctor
swift/.build/release/apple-bridge calendars
swift/.build/release/apple-bridge today
# Test MCP server (interactive)
APPLE_BRIDGE_BIN=swift/.build/release/apple-bridge npx @anthropic-ai/sdk mcp-run build/index.js
No tests. Verification is manual via CLI commands and MCP inspector.
Architecture
Claude Code ──stdio JSON-RPC──▶ TypeScript MCP Server ──execa──▶ Swift CLI (apple-bridge) ──EventKit──▶ macOS Calendar
TypeScript layer (src/):
index.ts— McpServer with StdioServerTransport, readsAPPLE_BRIDGE_BINenv varbridge/swift.ts— SwiftBridge class: calls binary via execa, parses JSON envelope{status, data, error}, 30s timeouttools/calendar.ts— 6 MCP tools with Zod validation: get_calendars, get_events, get_today_events, search_events, create_event, delete_event
Swift layer (swift/Sources/AppleBridge/):
main.swift— ArgumentParser CLI with 6 subcommands (mirrors MCP tools)CalendarService.swift— EventKit wrapper;predicateForEventsexpands recurring events; DispatchSemaphore for sync TCC permission request;#available(macOS 14.0, *)for compatibilityModels.swift— Codable DTOs, BridgeOutput JSON envelope, ISO8601 parsing (two formats: with/without fractional seconds), BridgeError enum with LocalizedError
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.
- 12d ago First seen · 79 lines · 890 tokens per session scan A c4be9023742a
apple-calendar-mcp CLAUDE.md is an instructions file published in the GitHub repository EgorKurito/apple-calendar-mcp (10 stars, last pushed 7mo ago), licensed MIT. It adds 890 tokens to every session, about $0.0044 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 2026-08-31.
Other instructions, from other repositories
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).