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/thejefflarson/soundcheck/contract-reviewnpx skills add thejefflarson/soundcheck --skill contract-reviewgit clone --depth 1 https://github.com/thejefflarson/soundcheckWrote 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/thejefflarson/soundcheck/contract-review)<a href="https://agentmods.dev/skills/thejefflarson/soundcheck/contract-review"><img src="https://agentmods.dev/badge/skills/thejefflarson/soundcheck/contract-review.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 | $0.00070 | $0.01009 |
| Opus 5 | $0.00035 | $0.00504 |
| Sonnet 5 | $0.00014 | $0.00202 |
| Haiku 4.5 | $0.00007 | $0.00101 |
Grade A, and why
contract-review 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 — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contract Review (deep) (A04:2025)
What this checks
Bugs that only resolve across both sides of a contract — a helper
whose body guarantees less than callers assume. security-review
pattern-matches 45 OWASP/LLM categories; this exists for what that
misses. Nightly CI or manual audits; not per-PR.
Vulnerable patterns
Deliberately none. Pattern lists bias the search; contract-audit
uses one open question per hotspot — what does the caller assume
that the body doesn't enforce? — and the orchestrator does not
inspect code.
Procedure
Use the Agent tool to dispatch subagents. Don't audit yourself. Keep state in conversation memory; don't write files.
Stage 0 — Threat model
Dispatch one threat-modeling subagent. Keep its JSON in
conversation context; thread it into every later subagent.
Stage 1 — Hotspot seed
Dispatch one hotspot-mapping subagent with the threat model
JSON. It scans the whole repo and returns a list of
{file, lines, name, category, priority, why} entries —
interesting functions to audit. Keep that list in conversation
memory.
Stage 2 — Round loop
Track two things in conversation memory:
probed: a mapping from hotspot key to the count of prior roundsrefuted[hotspot]: per-hotspot list of REFUTED(impl, caller, gap)triples from prior rounds
While stop conditions not met:
- Pick the hotspot with the fewest entries in
probed(ties: order in the seed list). - Dispatch one
contract-auditsubagent with the threat model JSON,Hotspot:,Why:,Round:, and therefuted[hotspot]block. The threat model informs reachability of the caller path (untrusted-input-reachable → real severity; trusted-only → Low). - Parse the
<soundcheck-contract>trailer. Append every VERIFIED hypothesis to an in-memoryfindingslist, copying every field verbatim (includingguards_tracedand any other fields the auditor emitted), and addinghotspot_keyandroundannotations. Append every REFUTED torefuted[hotspot]. - Increment
probed[hotspot]. - Update stagnation counter. Reset on VERIFIED; else increment.
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 · 101 lines · 70 tokens per session scan A d4ea506b0c82
contract-review is a skill published in the GitHub repository thejefflarson/soundcheck (20 stars, last pushed 1mo ago), licensed MIT. It adds 70 tokens to every session and 1,009 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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