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 skills add synthesisengineering/synthesis-skills --skill synthesis-mac-syncgit clone --depth 1 https://github.com/synthesisengineering/synthesis-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/skills/synthesisengineering/synthesis-skills/synthesis-mac-sync)<a href="https://agentmods.dev/skills/synthesisengineering/synthesis-skills/synthesis-mac-sync"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-mac-sync/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/skills/synthesisengineering/synthesis-skills/synthesis-mac-sync"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-mac-sync.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 | $0.00072 | $0.10837 |
| Opus 5 | $0.00036 | $0.05418 |
| Sonnet 5 | $0.00014 | $0.02167 |
| Haiku 4.5 | $0.00007 | $0.01084 |
Grade B, and why
synthesis-mac-sync scanned grade B 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 8d 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
Write a single bash script that loops through ALL files in the manifest, compares them with `diff`, checks timestamps with `stat -f %m` if different, copies the newer version, and applies `chmod 600` to sensitive files. How it starts
The opening of the file, as written. The whole thing — 867 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Synthesis Mac Sync
A methodology for keeping multiple Macs in sync using iCloud for configuration files and Git for repositories. Designed to run fully automated via an AI coding assistant — the user says "run my mac-sync" and the assistant handles everything.
This skill provides the protocol — the sync methodology, safety rules, conflict resolution, and manifest format. Your personal config file (a README or manifest in your iCloud sync folder) provides the specifics: which files, which machines, which repos.
Configuration
These values are user-specific. Update them for your environment.
| Setting | Value | Description |
|---|---|---|
icloud_sync_folder |
~/Library/Mobile Documents/com~apple~CloudDocs/workspaces/[username]/mac-sync/ |
iCloud Drive folder for synced config files |
git_scan_root |
~/workspaces/ |
Root directory for git repository discovery |
git_scan_max_depth |
3 |
Maximum depth for recursive .git directory search |
git_repos_manifest |
git-repos.yaml |
Legacy central manifest (transitional; see v1.6.0 section) |
workspace_repo_manifest |
<workspace>/.agents/repos.yaml |
Per-workspace repo manifest (v1.6.0; canonical for repo entries) |
Architecture
synthesis-mac-sync (this skill)
= the HOW — sync protocol, safety rules, conflict resolution, manifest format
Your config file (in your iCloud sync folder)
= the WHAT — your specific file list, machine inventory, repo paths
The skill is invoked by the AI assistant. The assistant reads both this skill (for methodology) and your config file (for specifics), then executes the sync.
Agent configuration ownership
Agent instructions, lifecycle hooks, and the stable subset of client configuration use version-controlled sources plus native adapters:
- Public reusable behavior lives in the
synthesis-skillsplugin. - Personal rules, private skills, hook policy, and owned config overlays live in the private personal source repository.
- Repository instructions live in tracked
AGENTS.md;CLAUDE.mdimports it. - Runtime-owned auth, trust databases, marketplace timestamps, caches, and machine-specific paths stay local to each client.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 867 lines · 72 tokens per session scan B efe5b8eb6d51
synthesis-mac-sync is a skill published in the GitHub repository synthesisengineering/synthesis-skills (18 stars, last pushed yesterday), licensed Apache-2.0. It adds 72 tokens to every session and 10,837 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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