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 johnefemer/skillfish --skill nextjs-developergit clone --depth 1 https://github.com/johnefemer/skillfishWrote 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/johnefemer/skillfish/nextjs-developer)<a href="https://agentmods.dev/skills/johnefemer/skillfish/nextjs-developer"><img src="https://agentmods.dev/badge/skills/johnefemer/skillfish/nextjs-developer/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/johnefemer/skillfish/nextjs-developer"><img src="https://agentmods.dev/badge/skills/johnefemer/skillfish/nextjs-developer.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 | $0.00000 | $0.06907 |
| Opus 5.5 | $0.00000 | $0.02763 |
| Sonnet 5.5 | $0.00000 | $0.01381 |
| Haiku 4.5 | $0.00000 | $0.00691 |
Grade A, and why
nextjs-developer 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 2mo 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
fetch(url, { cache: 'no-store' }); Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
// Cannot use: fs, child_process, native Node modules The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
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.
- 2mo ago First seen · 1,088 lines · 0 tokens per session scan A 7be18c71fc1b
nextjs-developer is a skill published in the GitHub repository johnefemer/skillfish (4 stars, last pushed 4d ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 6,907 tokens. 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 2026-09-03.
nextjs-developer compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| nextjs-developerjohnefemer/skillfish | Skill | 4 | 4d ago | none | A | 0 | Claude Code, Codex |
| langbot-devlangbot-app/LangBot | Skill | 19k | yesterday | Apache-2.0 | A | 136 | Claude Code, Codex |
| trigger-realtime-and-frontendtriggerdotdev/trigger.dev | Skill | 17k | 3d ago | Apache-2.0 | A | 148 | Claude Code, Codex |
| devtools-event-clientTanStack/devtools | Skill | 510 | yesterday | MIT | A | 79 | Claude Code, Codex |
| airflow-pluginsastronomer/agents | Skill | 458 | 4d ago | Apache-2.0 | A | 147 | Claude Code |
| walkeros-create-destinationelbwalker/walkerOS | Skill | 349 | 2d ago | MIT | A | 77 | Claude Code |
| walkeros-create-sourceelbwalker/walkerOS | Skill | 349 | 2d ago | MIT | A | 65 | Claude Code |