mattt/iMCP is a macOS app that provides an MCP server, allowing AI clients to access selected personal services such as Messages, Contacts, Reminders, Calendar, Maps, Location, and Weather. It is used with Claude Desktop and other Model Context Protocol clients to view or manage information from those services. The catalogue rule is an add-on for operating or configuring this app through an AI agent.
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.
git clone --depth 1 https://github.com/mattt/iMCPWrote 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/rules/mattt/imcp/ignore-sourcekit-warnings)<a href="https://agentmods.dev/rules/mattt/imcp/ignore-sourcekit-warnings"><img src="https://agentmods.dev/badge/rules/mattt/imcp/ignore-sourcekit-warnings/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/rules/mattt/imcp/ignore-sourcekit-warnings"><img src="https://agentmods.dev/badge/rules/mattt/imcp/ignore-sourcekit-warnings.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 | $0.00069 | $0.00069 |
| Opus 5.5 | $0.00028 | $0.00028 |
| Sonnet 5.5 | $0.00014 | $0.00014 |
| Haiku 4.5 | $0.00007 | $0.00007 |
Grade A, and why
ignore-sourcekit-warnings 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.
What it actually says
Ignore warnings erroneously generated by SourceKit like "Cannot find type '__' in scope" or "No such module '_'".
Assume types exist and modules are correctly installed.
Don't attempt to install new Swift packages.
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.
- 1mo ago First seen · 12 lines · 69 tokens per session scan A 741848c451f0
ignore-sourcekit-warnings is a cursor rule published in the GitHub repository mattt/iMCP (1,767 stars, last pushed today), licensed MIT. It adds 69 tokens to every session, about $0.0003 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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