Individual skill

harness-audit

Audit an agent's harness against the four rings: containment, guides, sensors, permissions. Use when the user asks whether their agent setup is safe, wants a review of sandboxing / permissions / hooks / AGENTS.md guardrails, or asks what a bad session could break. Read-only: reports the blast radius and a hardening list, changes nothing. Do NOT use for context layout (context-audit) or cost routing (gate-check).

plugins/agents-course/skills/harness-audit/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 1,540
Repository last updated: Nov 3, 2026
License: MIT

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# Audit the four rings

Theory: [The four rings](https://secondbrainos.dev/#/read/course-4-harness/the-four-rings)
and [Harness practice](https://secondbrainos.dev/#/read/course-4-harness/harness-practice).
Build from the outside in: containment, guides, sensors, permissions. The
order matters because each ring must hold when every ring inside it fails —
a guide can be ignored, a sensor can miss, an approval can be misclicked;
a wall does not care.

## Core rule

Report and rank; never harden anything yourself. The audit's one organising
question is the blast radius: describe the worst session possible under the
current setup and what it costs. If the user asks you to apply fixes