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/understudylabs/understudy-agent-tools/verify-serving-paritynpx skills add understudylabs/understudy-agent-tools --skill verify-serving-paritygit clone --depth 1 https://github.com/understudylabs/understudy-agent-toolsWrote 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/understudylabs/understudy-agent-tools/verify-serving-parity)<a href="https://agentmods.dev/skills/understudylabs/understudy-agent-tools/verify-serving-parity"><img src="https://agentmods.dev/badge/skills/understudylabs/understudy-agent-tools/verify-serving-parity.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 | $0.00024 | $0.00366 |
| Opus 5 | $0.00012 | $0.00183 |
| Sonnet 5 | $0.00005 | $0.00073 |
| Haiku 4.5 | $0.00002 | $0.00037 |
Grade A, and why
verify-serving-parity 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 3d 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.
What it actually says
Verify serving parity
Use src/serving-parity as a pure, offline verifier. Every lane must provide an
observed render fingerprint, contract fingerprint, parser evidence, and an
artifact reference plus SHA-256. Outputs contain references and hashes only;
never place prompts, responses, traces, labels, credentials, or weights in a
parity artifact.
Declare a meaningful minimum paired sample before scoring (default: 20). A
failed preflight refuses comparison. observed, weak, deviation, and
failed evidence status must remain visible, and the output includes
understudy.promotion_receipt.v1 compatibility metadata for downstream gates.
Run only against synthetic or already-approved local artifacts; this verifier makes no provider calls and does not access holdout data.
Safety Gates
- Compare at least two uniquely named lanes using the same artifact hash, observed render fingerprint, contract fingerprint, protocol, sampling, stop sequences, parser contract, and frozen task IDs.
- Predeclare a paired-sample floor and equivalence band. Missing pairs, duplicate task IDs, deviations, weak evidence, or invalid hashes fail closed.
- Keep prompts, responses, labels, traces, credentials, and weights out of the parity artifact. A passing parity receipt is necessary but not sufficient for promotion.
Resolve CLI
There is no public CLI yet. Build the package and call
preflightServingParity followed by scoreServingParity from
dist/serving-parity/index.js in an offline script. Do not score when preflight
refuses the evidence.
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.
- 3d ago First seen · 39 lines · 24 tokens per session scan A 62ff5b594953
verify-serving-parity is a skill published in the GitHub repository understudylabs/understudy-agent-tools (16 stars, last pushed 4d ago), licensed MIT. It adds 24 tokens to every session and 366 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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