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 anton-abyzov/vskill --skill php2shell-checkgit clone --depth 1 https://github.com/anton-abyzov/vskillWrote 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/anton-abyzov/vskill/php2shell-check)<a href="https://agentmods.dev/skills/anton-abyzov/vskill/php2shell-check"><img src="https://agentmods.dev/badge/skills/anton-abyzov/vskill/php2shell-check/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/anton-abyzov/vskill/php2shell-check"><img src="https://agentmods.dev/badge/skills/anton-abyzov/vskill/php2shell-check.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 | $0.00261 | $0.02380 |
| Opus 5.5 | $0.00104 | $0.00952 |
| Sonnet 5.5 | $0.00052 | $0.00476 |
| Haiku 4.5 | $0.00026 | $0.00238 |
Grade A, and why
php2shell-check 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 16d 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 — 102 lines — stays where its author put it; the contents beside it link to each section on GitHub.
php2shell-check
php2shell is two critical bugs in PHP's request handling, disclosed and fixed on 2026-10-21 (CVSS v4.0 9.2 each):
- CVE-2026-109618 (GHSA-w8hw-w9fx-j79w): memory corruption when PHP runs out of memory while setting up request data; multipart parsing can trigger it. Unauthenticated RCE, shown on mod_php with the default config; FPM, FrankenPHP and LSAPI are likely exposed.
- CVE-2026-109619 (GHSA-6wmf-4rv5-p3rp): use-after-free of request state across requests on the same worker. Unauthenticated RCE or memory disclosure; shown on mod_php (8.5
fatal_error_backtraces) and PHP-FPM via session upload progress, which is on by default. No app code needed.
Every web SAPI is affected (FPM, mod_php, php-cgi, FrankenPHP, LiteSpeed). CLI-only use is not the attack surface. Exploit attempts were seen on 2026-10-21 (Cloudflare, watchTowr). Not in CISA KEV as of 2026-10-21.
Sources: php.net, the two GitHub advisories above, NCSC, CERT-EU 2026-018.
Run it
Run on the machine (or inside the container) that serves PHP, from the project root. SKILL_DIR is the folder holding this SKILL.md; use the script's full path so --repo defaults to the project, not the skill folder:
sh "$SKILL_DIR/scripts/check.sh" # binaries + repo in cwd + ini stopgaps
sh "$SKILL_DIR/scripts/check.sh" --repo ./app # scan another project dir
sh "$SKILL_DIR/scripts/check.sh" --php /usr/sbin/php-fpm8.2 # one binary only
sh "$SKILL_DIR/scripts/check.sh" --version 8.4.26 # judge a version string
sh "$SKILL_DIR/scripts/check.sh" --url https://your-own-site.example # X-Powered-By only
sh "$SKILL_DIR/scripts/check.sh" --json # machine-readable
docker run --rm your-image php -v # containers: check the image, not the host
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 16d ago First seen · 102 lines · 261 tokens per session scan A b05423708388
php2shell-check is a skill published in the GitHub repository anton-abyzov/vskill (47 stars, last pushed 3d ago), licensed MIT. It adds 261 tokens to every session and 2,380 once invoked, about $0.0010 per session on Opus 5.5. 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 2026-10-22.
php2shell-check compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| php2shell-checkanton-abyzov/vskill | Skill | 47 | 3d ago | MIT | A | 261 | Claude Code |
| start-coding-taskedgar-durand/codeagent-mobile-clients | Skill | 8 | 8d ago | MIT | A | 33 | Claude Code, Codex |
| agent-config-setupofershap/create-agent-config | Skill | 2 | yesterday | MIT | A | 43 | Claude Code, Codex |
| continue-with-codeagent-creditsedgar-durand/codeagent-mobile-clients | Skill | 8 | 8d ago | MIT | A | 29 | Claude Code, Codex |
| review-agent-workedgar-durand/codeagent-mobile-clients | Skill | 8 | 8d ago | MIT | A | 25 | Claude Code, Codex |
| supervise-sessionedgar-durand/codeagent-mobile-clients | Skill | 8 | 8d ago | MIT | A | 17 | Claude Code, Codex |
| prereviewsinghharsh1708/kitbash | Skill | 10 | 20d ago | Apache-2.0 | A | 0 | Claude Code, Codex |