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/redosnpx skills add thejefflarson/soundcheck --skill redosgit clone --depth 1 https://github.com/thejefflarson/soundcheckWhat 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 | $0.00053 | $0.00557 |
| Opus 5 | $0.00026 | $0.00279 |
| Sonnet 5 | $0.00011 | $0.00111 |
| Haiku 4.5 | $0.00005 | $0.00056 |
Grade A, and why
redos 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 2d 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 — 46 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ReDoS Security Check (CWE-1333)
What this checks
Protects against Regular Expression Denial of Service where a crafted input causes catastrophic backtracking in regex engines. A single malicious string can pin a CPU core for minutes or hours, taking down the service.
Vulnerable patterns
- Nested quantifiers applied to user input — a quantified group whose body is itself quantified produces exponential state
- Overlapping alternation inside repetition — alternatives that can match the same prefix multiply backtracking work
- Common "email" or "URL" regexes built from quantified character classes wrapped in further repetition
- Regexes compiled from external configuration or user input where the pattern shape itself is attacker-controlled
Fix immediately
Flag the vulnerable regex, explain the risk, and suggest a fix establishing these properties. Translate the principle to the language and engine of the audited file — do not echo examples from another stack.
- No nested quantifiers on user input. Collapse a quantified group whose body is also quantified into a single quantifier. Rewrite alternations so alternatives cannot match the same prefix.
- Prefer a linear-time regex engine when one is available for the language under review. Engines that disallow backtracking guarantee linear matching regardless of pattern shape.
- Bound regex execution. When the engine supports it, set a match timeout or run the match on a cancellable worker; when it does not, simplify the pattern until worst-case input completes in bounded time.
- Treat patterns sourced from configuration or user input as untrusted. Either pre-compile a fixed allowlist of patterns, or run user-supplied patterns on a sandbox engine with a hard timeout.
Verification
- No regex applied to user input contains nested quantifiers or alternation inside repetition where alternatives share a prefix
- If the language offers a linear-time engine, the audited code uses it for user-input regexes; otherwise patterns are simplified or execution is time-bounded
- Regex patterns loaded from external configuration or user input run against an allowlist or under an enforced timeout
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.
- 2d ago First seen · 46 lines · 53 tokens per session scan A 092a4c6d3df0
redos is a skill published in the GitHub repository thejefflarson/soundcheck (20 stars, last pushed 1mo ago), licensed MIT. It adds 53 tokens to every session and 557 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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