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 gaelic-ghost/socket --skill harden-macosgit clone --depth 1 https://github.com/gaelic-ghost/socketWrote 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/gaelic-ghost/socket/harden-macos)<a href="https://agentmods.dev/skills/gaelic-ghost/socket/harden-macos"><img src="https://agentmods.dev/badge/skills/gaelic-ghost/socket/harden-macos/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/gaelic-ghost/socket/harden-macos"><img src="https://agentmods.dev/badge/skills/gaelic-ghost/socket/harden-macos.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 | $0.00051 | $0.00450 |
| Opus 5.5 | $0.00020 | $0.00180 |
| Sonnet 5.5 | $0.00010 | $0.00090 |
| Haiku 4.5 | $0.00005 | $0.00045 |
Grade A, and why
harden-macos 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.
How it starts
The opening of the file, as written. The whole thing — 37 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Harden macOS
Overview
Strengthen the actual exposure found on the Mac and verify each change. Preserve built-in protections, user access, recoverability, and organization management requirements.
Read references/macos-hardening-review.md for a risk-ordered review.
Workflow
- Establish context.
- Record exact macOS build/hardware, device ownership/management, users, role, exposed services, sensitive data, backups, and the threat being reduced.
- Apply supported updates.
- Verify OS, rapid/security data updates, browsers, extensions, apps, and package managers from authoritative channels.
- Preserve platform protections.
- Verify Gatekeeper/XProtect automatic protection, SIP, TCC/privacy access, code-signing expectations, and sandbox/container use where applicable.
- Keep this defensive posture review separate from developer prompt/request implementation; route ordinary app permission design to
macos-privacy-permissions-workflow.
- Protect data and recovery.
- Review FileVault/recovery ownership, screen lock, backup availability and restore testing, account separation, and secure disposal/export practices.
- Reduce exposed services and persistence.
- Review sharing, remote login/management, firewall policy, listeners, login/background items, profiles, system/network/browser extensions, and privileged helpers.
- Improve identity/browser behavior.
- Review MFA, password manager use, recovery methods, session/token hygiene, download sources, extensions, phishing-resistant habits, and administrator use.
- Add proportionate visibility.
- Define which alerts/logs or endpoint tooling are maintained, who reviews them, and how false positives are handled.
- Verify and document.
- Re-read changed settings, test access/recovery, record exceptions and owner, and avoid claiming perfect prevention.
Output
Return baseline, prioritized changes, applied/verified settings, deferred items and tradeoffs, recovery check, and residual risk.
What ships with it
2 files 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.
- 1mo ago First seen · 37 lines · 51 tokens per session scan A 90c03a14bc1c
harden-macos is a skill published in the GitHub repository gaelic-ghost/socket (7 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 51 tokens to every session and 450 once invoked, about $0.0002 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 2026-09-03.
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