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 commands/markdavidgan/apple-dev-skills/overlay-syncgit clone --depth 1 https://github.com/markdavidgan/apple-dev-skillsWrote 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/commands/markdavidgan/apple-dev-skills/overlay-sync)<a href="https://agentmods.dev/commands/markdavidgan/apple-dev-skills/overlay-sync"><img src="https://agentmods.dev/badge/commands/markdavidgan/apple-dev-skills/overlay-sync.svg" alt="Measured on agentmods" 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 | $0.00032 | $0.00153 |
| Opus 5 | $0.00016 | $0.00077 |
| Sonnet 5 | $0.00006 | $0.00031 |
| Haiku 4.5 | $0.00003 | $0.00015 |
Grade A, and why
overlay-sync 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 3d 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
Run the overlay-sync skill on $ARGUMENTS.
Reads .claude/apple-overlays.json, finds each declared engine's shipped overlay template, fills it from the project bindings, and regenerates .claude/skills/<prefix>-<engine>/SKILL.md — managed region only, preserving hand-written tails. Idempotent and safe to run any number of times in any Apple-development project. --check makes no writes and exits non-zero if committed overlays have drifted.
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.
- 3d ago First seen · 9 lines · 32 tokens per session scan A 2972bfed1df3
overlay-sync is a command published in the GitHub repository markdavidgan/apple-dev-skills (5 stars, last pushed 4d ago), licensed MIT. It adds 32 tokens to every session and 153 once invoked, about $0.0002 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.
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