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 skills add JustineDevs/premortem --skill file-access-vulngit clone --depth 1 https://github.com/JustineDevs/premortemWrote 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/justinedevs/premortem/file-access-vuln)<a href="https://agentmods.dev/skills/justinedevs/premortem/file-access-vuln"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/file-access-vuln/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/justinedevs/premortem/file-access-vuln"><img src="https://agentmods.dev/badge/skills/justinedevs/premortem/file-access-vuln.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00046 | $0.00327 |
| Opus 5 | $0.00023 | $0.00163 |
| Sonnet 5 | $0.00009 | $0.00065 |
| Haiku 4.5 | $0.00005 | $0.00033 |
Grade A, and why
file-access-vuln 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 6d 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.
This is a copy
100% identical to file-access-vuln — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
File Access Router
This is the routing entry point for filesystem paths, download endpoints, upload pipelines, and file preview handling.
When to Use
- Parameters, filenames, download endpoints, or import flows influence file paths
- The target supports upload, preview, transcoding, extraction, sharing, download, or proxied file access
- You need to decide whether this is path traversal/LFI or an upload-validation/processing-chain issue
Skill Map
- Path Traversal LFI: path traversal, file read, wrapper abuse, include chains
- Upload Insecure Files: upload validation, storage paths, processing chains, overwrite risk, preview/share boundaries
Recommended Flow
- First identify whether the entry point is a path parameter, download endpoint, or upload workflow
- Then locate whether the issue appears in accept, store, process, or serve stages
- Small path-chain and upload-bypass samples are merged into the main topic skills; no separate payload entry is needed
Related Categories
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.
- 6d ago First seen · 33 lines · 46 tokens per session scan A ad0f1bfd9440
file-access-vuln is a skill published in the GitHub repository JustineDevs/premortem (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 46 tokens to every session and 327 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to file-access-vuln, differing in 0 lines, and is treated as a copy.
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