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 PracticalSwan/agent-skills --skill preservation-verifiergit clone --depth 1 https://github.com/PracticalSwan/agent-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/practicalswan/agent-skills/preservation-verifier)<a href="https://agentmods.dev/skills/practicalswan/agent-skills/preservation-verifier"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/preservation-verifier/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/practicalswan/agent-skills/preservation-verifier"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/preservation-verifier.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 107 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 | $0.00054 | $0.01465 |
| Opus 5 | $0.00027 | $0.00732 |
| Sonnet 5 | $0.00011 | $0.00293 |
| Haiku 4.5 | $0.00005 | $0.00146 |
Grade A, and why
preservation-verifier 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 — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Preservation Verifier
Verify that a rewrite or file edit kept the content the original ../avoid-ai-writing/SKILL.md says to protect.
For cross-Skill work, follow ../avoid-ai-writing-router/references/handoff-contract.md and ../avoid-ai-writing-router/references/skill-graph.json.
Connection contract
Incoming
Accept before/after verification from:
avoid-ai-writing-routerviaROUTEwhen the user directly supplies before and after material.voice-preserving-rewriterviaVERIFYafter returned-text rewriting.file-edit-in-placeviaVERIFYafter an authorized named-file mutation.
Require both original and current versions. If either is unavailable, return control to the router rather than inventing a comparison.
Produce
Update the handoff envelope with:
execution_evidence.verifier:executedonly if the bundled validator ran, otherwisemodel_only.verification_summary.status:PASS,REVIEW, orFAIL.- blocking errors and warnings.
- exact repair target when repair is possible.
A FAIL is a blocking workflow result. The rewrite/edit stage is not complete merely because text was produced or a file write succeeded.
Outgoing
REPAIRtovoice-preserving-rewriterwhen returned text failed preservation.REPAIRtofile-edit-in-placewhen a named file failed preservation.RECHECKtoai-writing-detectoronly when convergence or a residual audit was part of the user's request.- Stop on
PASSunless another user-requested stage remains. - Stop and report on a second verification failure. Do not start another repair loop.
Architecture and implementation lenses
Apply both encoded lenses from ../avoid-ai-writing-router/references/agency-role-lenses.md:
agency-software-architect: verification is a boundary gate with explicit ownership and bounded repair cycles.agency-senior-developer: execution claims require actual command evidence, errors propagate, and before/after state remains attributable to the correct target.
What ships with it
4 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.
- 4d ago Changed 21a282e8a886
- 6d ago First seen · 154 lines · 54 tokens per session scan A 534f93fbc95c
preservation-verifier is a skill published in the GitHub repository PracticalSwan/agent-skills (14 stars, last pushed 4d ago), licensed MIT. It adds 54 tokens to every session and 1,465 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 2026-09-06.
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