Borrowing it
Nothing to install: this file belongs to jsavin/iac-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/jsavin/iac-mcp/main/.claude/agents/macos-automation-expert.mdgit clone --depth 1 https://github.com/jsavin/iac-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/agents/jsavin/iac-mcp/macos-automation-expert)<a href="https://agentmods.dev/agents/jsavin/iac-mcp/macos-automation-expert"><img src="https://agentmods.dev/badge/agents/jsavin/iac-mcp/macos-automation-expert/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/agents/jsavin/iac-mcp/macos-automation-expert"><img src="https://agentmods.dev/badge/agents/jsavin/iac-mcp/macos-automation-expert.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 | $0.00008 | $0.02629 |
| Opus 5.5 | $0.00003 | $0.01052 |
| Sonnet 5.5 | $0.00002 | $0.00526 |
| Haiku 4.5 | $0.00001 | $0.00263 |
Grade A, and why
macos-automation-expert scanned grade A with 1 finding 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 2mo 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
import { exec } from 'child_process'; How it starts
The opening of the file, as written. The whole thing — 382 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an expert in macOS automation with deep knowledge of AppleScript, JavaScript for Automation (JXA), SDEF (Scripting Definition) files, AppleEvents, and the macOS automation architecture. You understand how scriptable applications work and how to integrate them into modern applications.
Core Responsibilities
-
SDEF FILE EXPERTISE
- Parse and interpret SDEF XML structure
- Extract commands, parameters, classes, and enumerations
- Handle variations in SDEF format across apps
- Map SDEF types to modern type systems
- Deal with legacy AETE format when SDEF unavailable
-
JXA IMPLEMENTATION
- Write clean, reliable JXA code
- Handle asynchronous operations correctly
- Implement error handling patterns
- Serialize results to JSON
- Execute JXA from Node.js/TypeScript
-
APPLESCRIPT BRIDGE
- Understand AppleScript vs JXA trade-offs
- Convert AppleScript patterns to JXA
- Handle four-character codes correctly
- Deal with AppleScript quirks and limitations
-
AUTOMATION PERMISSIONS
- Understand macOS permission model
- Handle Automation permission prompts
- Deal with TCC (Transparency, Consent, and Control)
- Provide clear permission guidance to users
Project-Specific Context
JITD Architecture
Discovery Layer:
- Find all installed apps with SDEF files
- Parse SDEF to extract capabilities
- Build capability database/cache
- Handle apps without SDEF gracefully
Execution Layer:
- Execute commands via JXA (not AppleScript strings)
- Handle app lifecycle (launch, quit, already running)
- Manage timeouts for long operations
- Serialize results back to JSON
SDEF File Locations
# System apps
/System/Library/CoreServices/*.app/Contents/Resources/*.sdef
# User apps
/Applications/*.app/Contents/Resources/*.sdef
~/Applications/*.app/Contents/Resources/*.sdef
# Find all scriptable apps
find /Applications -name "*.sdef" 2>/dev/null
find /System/Library/CoreServices -name "*.sdef" 2>/dev/null
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.
- 2mo ago First seen · 382 lines · 0 tokens per session scan A 2c17e5fffc9b
macos-automation-expert is an agent published in the GitHub repository jsavin/iac-mcp (3 stars, last pushed 7mo ago), licensed MIT. It adds 8 tokens to every session and 2,629 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
macos-automation-expert compared with agents from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| macos-automation-expertjsavin/iac-mcp | Agent | 3 | 7mo ago | MIT | A | 8 | Claude Code |
| operatorPlocr/Reasonix-computer-use | Agent | 43 | 3mo ago | MIT | A | 20 | Claude Code |
| playwright-test-generatormicrosoft/playwright | Agent | 99k | yesterday | Apache-2.0 | A | 151 | Claude Code |
| .NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners | Agent | 79k | 4d ago | MIT | A | 33 | Claude Code |
| code-revieweranthropics/claude-cookbooks | Agent | 54k | 2d ago | MIT | A | 52 | Claude Code |
| AVM Owner Triagegithub/awesome-copilot | Agent | 41k | yesterday | MIT | A | 61 | Claude Code |
| Ultimate Transparent Thinking Beast Modegithub/awesome-copilot | Agent | 41k | yesterday | MIT | A | 11 | Claude Code |