k6

k6 is a skill for Claude Code from aks-builds/quality-skills. It costs 128 tokens per session (2,478 once invoked), scanned A, original, MIT.

A guide for k6, a JavaScript-based tool for sending controlled traffic to an application and measuring its behavior. It covers scenarios, virtual users, iterations, checks, thresholds, and different traffic shapes.

In plain words
What is it for?
Use it to create, run, debug, and integrate k6 load tests for average traffic, peaks, spikes, or long-running loads.
Why use it?
It helps turn a performance question into a measurable test by matching the traffic pattern, environment, and service-level target to the test design.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the quality-skills plugin — 57 skills shipped together

Good fit Use it to create, run, debug, and integrate k6 load tests for average traffic, peaks, spikes, or long-running loads.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/aks-builds/quality-skills/k6
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 aks-builds/quality-skills --skill k6
Clone the repo
git clone --depth 1 https://github.com/aks-builds/quality-skills

Made for: Claude Code.

Or install quality-skills, the plugin that ships this one along with the rest of its 57 skills.

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 k6

README.md
[![agentmods](https://agentmods.dev/badge/skills/aks-builds/quality-skills/k6/github.svg)](https://agentmods.dev/skills/aks-builds/quality-skills/k6)
Your own site
<a href="https://agentmods.dev/skills/aks-builds/quality-skills/k6"><img src="https://agentmods.dev/badge/skills/aks-builds/quality-skills/k6/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.

agentmods 80×15 button for k6

Your own site · 80×15
<a href="https://agentmods.dev/skills/aks-builds/quality-skills/k6"><img src="https://agentmods.dev/badge/skills/aks-builds/quality-skills/k6.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 128 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,478 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 original 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 $0.00128 $0.02478
Opus 5 $0.00064 $0.01239
Sonnet 5 $0.00026 $0.00496
Haiku 4.5 $0.00013 $0.00248

Measured 10d ago against content hash f181e8d1f0e0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

k6 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 10d 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.

curl https://github.com/grafana/k6/releases/download/<version>/k6-<version>-linux-amd64.tar.gz | tar xz
skills/k6/SKILL.md · 245 lines

How it starts

The opening of the file, as written. The whole thing — 245 lines — stays where its author put it; the contents beside it link to each section on GitHub.

k6

You are an expert in Grafana k6 (formerly LoadImpact k6). Your goal is to help engineers write realistic load tests, set meaningful thresholds, choose the right scenario type, integrate k6 into CI, and avoid the most common load-testing anti-patterns. Don't fabricate k6 API methods, scenario executor names, or CLI flags. When uncertain, point the reader to grafana.com/docs/k6.

Initial Assessment

Check .agents/qa-context.md (fallback: .claude/qa-context.md) before answering. Pay attention to:

  • SLO targets — without a target (e.g., "p95 < 300ms at 200 RPS for /checkout"), load testing produces unactionable numbers.
  • Traffic profile — average vs peak vs spike vs soak. Different shapes need different scenario executors.
  • Target environment — production-like (perf env), staging, ephemeral. Never load-test prod without explicit owner consent.
  • Languages — k6 tests are JS modules. Teams comfortable with JS migrate fastest from existing tooling.
  • Existing perf tooling — migrating from JMeter changes how thinking-time, scenarios, and assertions look.

If the file does not exist, ask: SLO target (p50/p95/p99 + RPS), traffic profile, target environment, and whether results need to flow to Grafana / Datadog / k6 Cloud.


Why k6

  • JS scripting — readable, refactorable, version-controllable.
  • Goal-oriented thresholds — assertions on metrics that pass/fail the test.
  • Scenario executors — distinct shapes (constant load, ramping users, arrival-rate-driven) without writing them by hand.
  • Built-in metrics + tags — out-of-the-box latency, error rate, throughput; tag by URL / RPC for per-endpoint slicing.
  • Cloud + open source — same script runs locally and in k6 Cloud / k6-operator on Kubernetes.

When not to use k6:

  • JVM-deep teams that already have Gatling expertise → gatling.
  • Test scripts must be authored by non-coders → JMeter UI is often easier for that audience.
  • Massive distributed runs without managed cloud → k6-operator or k6 Cloud help; pure self-hosted distributed k6 is non-trivial.

Read the full file on GitHub · 245 lines

Files

What ships with it

1 file 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.

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. 10d ago First seen · 245 lines · 128 tokens per session scan A f181e8d1f0e0

Subscribe to this mod's changes

k6 is a skill published in the GitHub repository aks-builds/quality-skills (2 stars, last pushed today), licensed MIT. It adds 128 tokens to every session and 2,478 once invoked, about $0.0006 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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