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 instructions/thejefflarson/soundcheck/claude-mdgit 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/instructions/thejefflarson/soundcheck/claude-md)<a href="https://agentmods.dev/instructions/thejefflarson/soundcheck/claude-md"><img src="https://agentmods.dev/badge/instructions/thejefflarson/soundcheck/claude-md.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 | $0.02821 | $0.02821 |
| Opus 5 | $0.01411 | $0.01411 |
| Sonnet 5 | $0.00564 | $0.00564 |
| Haiku 4.5 | $0.00282 | $0.00282 |
Grade A, and why
soundcheck CLAUDE.md 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 yesterday.
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 — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Soundcheck — Dev Conventions
What is Soundcheck?
Soundcheck is a Claude Code plugin providing 48 auto-invoking security skills plus three on-demand review modes (and one cleanup orchestrator), each scoped to a distinct use case. When Claude detects vulnerable code patterns mid-task, the relevant per-category skill auto-invokes, flags the issue, explains the change, and continues — no user intervention required.
Auto-invocation is driven entirely by the description frontmatter in each SKILL.md.
No CLAUDE.md trigger mapping is needed — the description field IS the trigger.
Three review modes
The on-demand reviews are split into three discrete modes, each with its own skill, driver script, latency profile, and target bug class. Reach for the one that matches the situation; don't try to make one mode do another's job.
| Mode | Skill | Driver | Latency | Model | Target |
|---|---|---|---|---|---|
| 1 — PR gate | pr-review |
security-review-action.py --diff-base REF |
≤1 min | haiku | Critical/High OWASP in changed files |
| 2 — Full scan | security-review |
security-review-action.py --full-repo |
~20 min | sonnet/opus | All severities, whole repo, with subagent fan-out |
| 3 — Contract review | contract-review |
contract-review.py --rounds N |
~30 min | opus | Caller/callee invariant gaps that single-pass review misses |
Mode 2 dispatches 5 subagents (threat-modeling, hotspot-mapping,
design-review, vulnerability-audit, attack-chain-analysis). Mode 1 is
single-pass — no subagent dispatch — and filters to Critical/High only so
the gate stays fast and quiet. Mode 3 dispatches threat-modeling,
hotspot-mapping, and one contract-audit per round. Output is the
findings table printed to stdout — no on-disk state. A Mythos-style
trust-anchor-confusion bug that mode 2 missed twice (Botan
certificate_known) is the canonical mode 3 target.
Threat model (for /security-review against this repo)
- Purpose: Claude Code plugin (skills) + a PR-gate GitHub Action
(
scripts/security-review-action.py) + a GitHub Action-style self-test. - Attack surface:
scripts/security-review-action.py(CI with write perms and API access),.github/workflows/*,.claude-plugin/plugin.json,.claude/skills/*/SKILL.md. Everything underscripts/is maintainer code run locally or in CI with trusted inputs. - Trusted inputs: maintainer-committed skill files,
scripts/,docs/skill-template.md,plugin.json, hardcoded benchmark manifests. - Untrusted inputs: third-party repo content scanned by
security-review-action.py, cloned benchmark repos, GitHub issue content. - Out of scope (auditors should discount these):
- Defense-in-depth hardening on local-only dev scripts (
benchmark-*.py,smoke-test-skills.py,validate-skills.py). - Intentionally vulnerable fixtures in
docs/test-cases/. - Opt-in flags whose behavior is the feature:
--apply-rewritesonsecurity-review-action.pyhands the agent Edit access by design so CI can apply fixes automatically; this is opt-in, not a default. - Word-count / lint / style issues in skill files.
- Defense-in-depth hardening on local-only dev scripts (
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.
- yesterday First seen · 240 lines · 2,821 tokens per session scan A 07b364721599
soundcheck CLAUDE.md is an instructions file published in the GitHub repository thejefflarson/soundcheck (20 stars, last pushed 1mo ago), licensed MIT. It adds 2,821 tokens to every session, about $0.0141 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 2026-09-03.
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