performance

performance is a skill for Claude Code, Codex from Nimble-Co/nimblenomicon. It costs 49 tokens per session (2,429 once invoked), scanned A, original, no licence file.

A skill for improving website performance, meaning how quickly pages load and respond for visitors. It focuses on reducing delays and improving the user experience.

In plain words
What is it for?
Use it to speed up a website, reduce load time, and audit or fix page-performance problems.
Why use it?
It helps find and address causes of slow loading or poor page-speed results.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

Good fit Use it to speed up a website, reduce load time, and audit or fix page-performance problems.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/nimble-co/nimblenomicon/performance
Install

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.

Any agent
npx skills add Nimble-Co/nimblenomicon --skill performance
Clone the repo
git clone --depth 1 https://github.com/Nimble-Co/nimblenomicon

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for performance

README.md
[![agentmods](https://agentmods.dev/badge/skills/nimble-co/nimblenomicon/performance.svg)](https://agentmods.dev/skills/nimble-co/nimblenomicon/performance)
Your own site
<a href="https://agentmods.dev/skills/nimble-co/nimblenomicon/performance"><img src="https://agentmods.dev/badge/skills/nimble-co/nimblenomicon/performance.svg" alt="Measured on agentmods" height="20"></a>
Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,429 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00049 $0.02429
Opus 5 $0.00024 $0.01215
Sonnet 5 $0.00010 $0.00486
Haiku 4.5 $0.00005 $0.00243

Measured 7d ago against content hash daa21a98449a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

performance scanned grade A 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 7d 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(event.request).then((response) => {
.agents/skills/performance/SKILL.md · 408 lines

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.

Read it on GitHub

Changes

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.

  1. 7d ago First seen · 408 lines · 49 tokens per session scan A daa21a98449a

Subscribe to this mod's changes

performance is a skill published in the GitHub repository Nimble-Co/nimblenomicon (5 stars, last pushed 1mo ago), with no licence file. It adds 49 tokens to every session and 2,429 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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