Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/sampsonky/xcodebuildmcp/cursorrulesgit clone --depth 1 https://github.com/SampsonKY/XcodeBuildMCPWhat 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 | $0.01983 | $0.01983 |
| Opus 5 | $0.00992 | $0.00992 |
| Sonnet 5 | $0.00397 | $0.00397 |
| Haiku 4.5 | $0.00198 | $0.00198 |
Grade A, and why
cursorrules 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 yesterday.
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 — 237 lines — stays where its author put it; the contents beside it link to each section on GitHub.
XcodeBuildMCP Rules
You are an AI assistant helping with the XcodeBuildMCP project - a Model Context Protocol (MCP) server that provides Xcode-related tools for AI assistants and MCP clients.
Project Overview
- Project: XcodeBuildMCP - MCP server for Xcode operations
- Tech Stack: TypeScript, Node.js (ES modules), MCP SDK
- Purpose: Standardized interface for AI agents to interact with Xcode projects
- Target Platforms: macOS, iOS Simulator, iOS Device
Key Technologies & Dependencies
- Runtime: Node.js 18+ with ES modules (
type: "module") - Language: TypeScript with strict configuration
- MCP SDK:
@modelcontextprotocol/sdkfor protocol implementation - Error Monitoring: Sentry for production error tracking
- External Tools: xcodebuild, AXe (UI automation), iOS Simulator
- Package Management: npm, supports mise for environment management
Build Commands
- Build:
npm run build - Lint:
npm run lint - Fix lint issues:
npm run lint:fix - Format code:
npm run format - Check formatting:
npm run format:check - Run diagnostics:
npm run diagnostic - Watch mode for development:
npm run build:watch - Launch MCP Inspector for testing:
npm run inspect
Code Style & Standards
TypeScript Configuration
- Target: ES2022 with Node16 module resolution
- Strict type checking enabled
- Source maps enabled for debugging
- Output directory:
./build - Explicit function return types required
- No console.log (console.error allowed for MCP logging)
- Unused variables prefixed with underscore
Code Style Guidelines
- TypeScript with strict typing enabled
- ES Modules (
import/export) syntax - Prefer explicit imports over wildcard imports
- Group imports: Node.js modules → third-party → local modules
- Name files in kebab-case, variables/functions in camelCase, classes in PascalCase
- Prefer async/await over Promises
- Comment complex logic but avoid redundant comments
- Error handling should use typed errors from utils/errors.ts
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.
- yesterday First seen · 237 lines · 1,983 tokens per session scan A 9a6918fa7d59
cursorrules is a cursor rule published in the GitHub repository SampsonKY/XcodeBuildMCP (1 stars, last pushed 1y ago), licensed MIT. It adds 1,983 tokens to every session, about $0.0099 per session on Opus 5. A static security scan graded it A with 0 findings. It comes from a forked repository.
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