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/insecure-local-storagenpx skills add thejefflarson/soundcheck --skill insecure-local-storagegit 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/insecure-local-storage)<a href="https://agentmods.dev/skills/thejefflarson/soundcheck/insecure-local-storage"><img src="https://agentmods.dev/badge/skills/thejefflarson/soundcheck/insecure-local-storage.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 | $0.00066 | $0.00738 |
| Opus 5 | $0.00033 | $0.00369 |
| Sonnet 5 | $0.00013 | $0.00148 |
| Haiku 4.5 | $0.00007 | $0.00074 |
Grade C, and why
insecure-local-storage scanned grade C with 1 finding 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.
Harvests environment variableshighData exfiltration
Enumerating or grepping the environment for keys collects credentials unrelated to what the mod says it does.
process with file-system access, or a device backup restore, harvest credentials and How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Insecure Local Data Storage (A02:2025)
What this checks
Detects sensitive data written to unprotected local storage. Cleartext storage lets any process with file-system access, or a device backup restore, harvest credentials and tokens without authentication.
Vulnerable patterns
- Credentials or tokens written to a plain file (JSON, INI, dotfile) without encryption
- Sensitive values written to an unencrypted platform preference store such as Android
SharedPreferences, iOSUserDefaults, or Windows registry - Long-lived auth token placed in browser
localStorageorsessionStoragewhere any script on the origin can read it - SQLite or other embedded database storing credentials with no at-rest encryption
- Temp files containing secrets written to a world-readable directory with default permissions and not deleted on completion
Fix immediately
Flag the vulnerable code and explain the risk. Translate the principles below to the audited file's platform and language — use that platform's documented secure-storage API (keychain, EncryptedSharedPreferences, DPAPI, HttpOnly cookie, etc.).
For each finding, establish these properties:
- Sensitive values go to platform-managed secure storage, not a plain file or
pref store. OS keychain, Android
EncryptedSharedPreferences, Windows DPAPI or Credential Manager, Linux secret service. These encrypt at rest and scope access to the owning process. - Web clients do not store long-lived credentials in
localStorageorsessionStorage. These are readable by any script on the origin — one XSS and the token is gone. Use a Secure, HttpOnly, SameSite cookie for session tokens, or a short-lived in-memory token refreshed from the server. - If secure storage is unavailable, data is encrypted with a key that also lives in secure storage — not hardcoded, not in the same file, not derived from device-static values. Symmetric encryption with a keychain-held key is the baseline.
- Temp files for sensitive data are avoided, or created with restrictive user-only permissions, written to a user-only directory, and deleted in a finally/cleanup block — never left in a world-writable directory with default permissions.
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 · 63 lines · 66 tokens per session scan C 12a3d7ca2c54
insecure-local-storage is a skill published in the GitHub repository thejefflarson/soundcheck (20 stars, last pushed 1mo ago), licensed MIT. It adds 66 tokens to every session and 738 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 1 finding (harvests environment variables). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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