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/path-traversalnpx skills add thejefflarson/soundcheck --skill path-traversalgit 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 | $0.00070 | $0.00748 |
| Opus 5 | $0.00035 | $0.00374 |
| Sonnet 5 | $0.00014 | $0.00150 |
| Haiku 4.5 | $0.00007 | $0.00075 |
Grade A, and why
path-traversal 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 — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Path Traversal Security Check (A01:2025)
What this checks
Protects against directory traversal attacks where an attacker uses ../ sequences,
absolute paths, or symlinks to access files outside the intended directory. Exploitation
leads to reading sensitive files (/etc/passwd, .env, private keys), overwriting
configuration, or achieving remote code execution via file write.
Vulnerable patterns
- A caller-supplied filename interpolated or concatenated into a path before opening, with no canonicalization.
- Path-join helper used as the only defense — these collapse some
..segments but do not verify the final path stays under the intended root, and many treat an absolute caller-supplied path as overriding the base. - Existence or stat check on the user path that does not follow symlinks, but the subsequent read/write does — symlink escape.
- Canonicalization performed once at handler entry, but a later file operation uses the un-canonicalized value.
Fix immediately
Flag the vulnerable code and explain the risk. Then suggest a fix that establishes these properties. Translate each property into the audited file's language and filesystem API — use that platform's documented canonicalization and symlink- resolution call.
- The intended root is resolved to a canonical absolute path once, up front. Everything that follows compares against the resolved root, not against a relative string that can match itself after traversal.
- The caller-supplied path is joined with the root, then resolved to a canonical absolute path that also follows symlinks — using the platform's real-path / canonicalize / resolve-symlinks call. Only after this does the containment check make sense.
- The resolved target must start with the resolved root. A mismatch means
traversal or symlink escape; reject rather than fall through. Standard
path-join APIs alone do not satisfy this — they collapse some
..segments but do not verify containment. - The check runs before every file operation — read, write, delete, stat. A canonicalization that happens once at handler entry but is not re-applied to a later file operation is a bug.
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 · 60 lines · 70 tokens per session scan A 651e31dce8f0
path-traversal 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 748 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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