Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/agnt-gg/agntnpx agentmods add skills/agnt-gg/agnt/agnt-plugin-builderWrote 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/agnt-gg/agnt/agnt-plugin-builder)<a href="https://agentmods.dev/skills/agnt-gg/agnt/agnt-plugin-builder"><img src="https://agentmods.dev/badge/skills/agnt-gg/agnt/agnt-plugin-builder/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/agnt-gg/agnt/agnt-plugin-builder"><img src="https://agentmods.dev/badge/skills/agnt-gg/agnt/agnt-plugin-builder.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 | $0.00201 | $0.04795 |
| Opus 5.5 | $0.00080 | $0.01918 |
| Sonnet 5.5 | $0.00040 | $0.00959 |
| Haiku 4.5 | $0.00020 | $0.00479 |
Grade A, and why
agnt-plugin-builder scanned grade A with 2 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 yesterday.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
const res = await fetch(API + '/plugins/install-file', { Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
| `spawn-process` | shells out (`child_process`, `node:child_process`, `execFile`, `spawn`) | The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
2 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.
- yesterday Changed · +35 lines 0dbd399989d3
- 1mo ago First seen · 425 lines · 201 tokens per session scan A ab07e8bf7124
agnt-plugin-builder is a skill published in the GitHub repository agnt-gg/agnt (556 stars, last pushed today), with no licence file. It adds 201 tokens to every session and 4,795 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 2 findings (makes network calls, runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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