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 skills/dshakes/compass/hardennpx skills add dshakes/compass --skill hardengit clone --depth 1 https://github.com/dshakes/compassWrote 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/dshakes/compass/harden)<a href="https://agentmods.dev/skills/dshakes/compass/harden"><img src="https://agentmods.dev/badge/skills/dshakes/compass/harden.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 | $0.00056 | $0.00789 |
| Opus 5 | $0.00028 | $0.00394 |
| Sonnet 5 | $0.00011 | $0.00158 |
| Haiku 4.5 | $0.00006 | $0.00079 |
Grade A, and why
harden 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 4d 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 — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Harden — security sweep in five ordered steps
Run each command in sequence. Stop on a non-zero exit and fix the finding before proceeding. All five must pass before the branch is considered hardened.
Steps
1 · Secrets — compass scan --staged
Scan the staged diff for secrets at the commit boundary.
compass scan --staged
Exits 0 (clean) or 1 (secrets found). Fix: remove the secret, rotate the
credential, then re-stage. Add an # allowlist secret comment ONLY for
confirmed test fixtures — never real credentials.
2 · MCP supply-chain pins — scripts/check-mcp.sh
Verify every auto-installed MCP server is pinned to an exact version and that
no @latest float or shell-injection marker has crept in.
bash scripts/check-mcp.sh
Exits 0 (pinned + clean) or non-zero (floating version or injection marker).
Fix: pin the version in mcp/servers.json and re-run. (setup-mcp.sh runs this
same audit as a pre-flight, and compass doctor includes it.)
3 · Install fidelity — compass drift
Check that the installed ~/.claude config still matches this repo's source.
Catches hand-edited copies, stale hooks, and non-executable guardrail scripts.
compass drift
Exits 0 (in sync) or non-zero (drift detected). Fix: re-run quickstart.sh
or remove the hand-edited file and let the install re-link it.
4 · Release provenance — compass verify
Verify the latest release tarball's keyless SLSA attestation. Requires gh.
compass verify
Exits 0 (attestation valid), 77 (gh lacks attestation support — skip), or non-zero (attestation missing or invalid). A 77 is a safe skip on old gh versions; anything else is a provenance gap to investigate.
5 · Untrusted code — compass sandbox -- <cmd>
Run any untrusted command inside a real OS sandbox (no network, writes confined to cwd/tmp via bwrap/firejail/sandbox-exec). Required before executing code fetched from external sources.
compass sandbox -- <cmd>
Exits 0 (ran confined), 2 (usage error — supply a command), or non-zero if the sandboxed command itself fails. If no backend is available the CLI refuses to run the command unconfined — install bwrap or firejail first.
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.
- 4d ago First seen · 81 lines · 56 tokens per session scan A e6471cad52a9
harden is a skill published in the GitHub repository dshakes/compass (19 stars, last pushed 10d ago), licensed MIT. It adds 56 tokens to every session and 789 once invoked, about $0.0003 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 2026-08-30.
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