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 bolivian-peru/os-moda --skill drift-detectiongit clone --depth 1 https://github.com/bolivian-peru/os-modaWrote 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/bolivian-peru/os-moda/drift-detection)<a href="https://agentmods.dev/skills/bolivian-peru/os-moda/drift-detection"><img src="https://agentmods.dev/badge/skills/bolivian-peru/os-moda/drift-detection/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/bolivian-peru/os-moda/drift-detection"><img src="https://agentmods.dev/badge/skills/bolivian-peru/os-moda/drift-detection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00029 | $0.00638 |
| Opus 5 | $0.00015 | $0.00319 |
| Sonnet 5 | $0.00006 | $0.00128 |
| Haiku 4.5 | $0.00003 | $0.00064 |
Grade A, and why
drift-detection 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 10d 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 — 82 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Configuration Drift Detection
NixOS is declarative — the config should be the single source of truth. But reality drifts: manual edits, imperative installs, ad-hoc cron jobs. Detect and reconcile.
Checks
1. Imperatively installed packages
shell_exec({ command: "nix-env -q 2>/dev/null || echo 'none'" })
If packages found: offer to add them to environment.systemPackages in NixOS config.
2. Manual files outside NixOS
shell_exec({ command: "find /etc -newer /etc/NIXOS -not -path '/etc/nixos/*' -not -path '/etc/resolv.conf' -type f 2>/dev/null | head -20" })
Files modified after last NixOS rebuild may be manual edits.
3. Manual cron jobs
shell_exec({ command: "ls /etc/cron.d/ /var/spool/cron/crontabs/ 2>/dev/null" })
Offer to convert to systemd timers in NixOS config.
4. Stale NixOS generations
shell_exec({ command: "nixos-rebuild list-generations 2>/dev/null | wc -l" })
More than 20 generations → suggest cleanup.
5. Orphaned systemd units
shell_exec({ command: "systemctl list-units --state=failed --no-pager" })
Remediation
For each drift finding, offer to bring it into NixOS:
Drift Report:
⚠️ 3 packages installed via nix-env: htop, ncdu, tree
→ Add to environment.systemPackages? [Y/n]
⚠️ /etc/cron.d/backup exists outside NixOS
→ Convert to systemd timer in NixOS config? [Y/n]
⚠️ 47 old NixOS generations (using 18GB)
→ Keep current + last 5, remove rest? [Y/n]
✅ No unauthorized file changes in /etc/nixos/
✅ All systemd services match NixOS config
Why This Matters
On Ubuntu, configuration drift is invisible and irreversible. On NixOS with osModa, you can:
- Detect that something was changed manually
- Reconcile by adding it to the declarative config
- Prove with the audit ledger that nothing unauthorized happened
- Reproduce the exact system state on new hardware
This is useful supporting evidence for compliance programs (SOC 2, etc.) — though not by itself proof of regulatory readiness.
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.
- 10d ago First seen · 82 lines · 29 tokens per session scan A e362ca5b9086
drift-detection is a skill published in the GitHub repository bolivian-peru/os-moda (117 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 29 tokens to every session and 638 once invoked, about $0.0001 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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