performance-testing

performance-testing is a skill for Claude Code from MonumentalSystems/Atlas-Agent-Teams. It costs 11 tokens per session (2,238 once invoked), scanned A, original, MIT.

A guide to checking how an application behaves under normal, heavy, sudden, and sustained traffic. It covers load, stress, spike, and soak testing, along with measures such as response time, throughput, errors, and resource use.

In plain words
What is it for?
Use it to plan performance tests, simulate traffic, measure system limits, check scaling, and find bottlenecks.
Why use it?
It helps reveal slowdowns, capacity limits, failure behavior, and recovery problems before real users encounter them.

Skill for Claude Code

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

Part of the qa-testing plugin — 4 skills, 1 command, 5 agents shipped together

Good fit Use it to plan performance tests, simulate traffic, measure system limits, check scaling, and find bottlenecks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/monumentalsystems/atlas-agent-teams/performance-testing
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 MonumentalSystems/Atlas-Agent-Teams --skill performance-testing
Clone the repo
git clone --depth 1 https://github.com/MonumentalSystems/Atlas-Agent-Teams

Made for: Claude Code.

Or install qa-testing, the plugin that ships this one along with the rest of its 4 skills, 1 command, 5 agents.

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-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/monumentalsystems/atlas-agent-teams/performance-testing/github.svg)](https://agentmods.dev/skills/monumentalsystems/atlas-agent-teams/performance-testing)
Your own site
<a href="https://agentmods.dev/skills/monumentalsystems/atlas-agent-teams/performance-testing"><img src="https://agentmods.dev/badge/skills/monumentalsystems/atlas-agent-teams/performance-testing/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 performance-testing

Your own site · 80×15
<a href="https://agentmods.dev/skills/monumentalsystems/atlas-agent-teams/performance-testing"><img src="https://agentmods.dev/badge/skills/monumentalsystems/atlas-agent-teams/performance-testing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 11 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,238 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00011 $0.02238
Opus 5 $0.00005 $0.01119
Sonnet 5 $0.00002 $0.00448
Haiku 4.5 $0.00001 $0.00224

Measured 6d ago against content hash 66121bf02a60, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

performance-testing 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 6d 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.

teams/qa-testing/skills/performance-testing/SKILL.md · 325 lines

How it starts

The opening of the file, as written. The whole thing — 325 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Performance Testing

Performance Testing Types

Load Testing

Purpose: Verify system performance under expected load

  • Simulates expected user traffic and data volume
  • Identifies performance bottlenecks under normal conditions
  • Establishes performance baselines
  • Validates SLA compliance

Key Metrics:

  • Response time (average, median, p95, p99)
  • Throughput (requests per second, transactions per second)
  • Error rate
  • Resource utilization (CPU, memory, disk, network)

Stress Testing

Purpose: Identify system breaking points

  • Exceeds expected load to find limits
  • Tests system recovery after failure
  • Identifies failure modes and error handling
  • Validates graceful degradation

Key Metrics:

  • Maximum concurrent users before failure
  • Maximum throughput before failure
  • Time to recover after load reduction
  • Error patterns and failure modes

Spike Testing

Purpose: Handle sudden traffic increases

  • Simulates sudden traffic spikes (e.g., flash sales, viral content)
  • Tests system elasticity and auto-scaling
  • Validates queuing and throttling mechanisms
  • Identifies race conditions under load

Key Metrics:

  • Response time during spike
  • Error rate during spike
  • Time to stabilize after spike
  • Queue depth and processing time

Soak Testing

Purpose: Verify stability over extended periods

  • Runs sustained load for hours or days
  • Identifies memory leaks and resource exhaustion
  • Tests database connection pool stability
  • Validates garbage collection efficiency

Key Metrics:

  • Memory usage over time
  • Response time trends
  • Error rate over time
  • Resource utilization trends

Volume Testing

Purpose: Test with large data volumes

  • Tests performance with realistic data sizes
  • Identifies database query performance issues
  • Tests file system and storage performance
  • Validates data migration performance

Key Metrics:

  • Query execution time with large datasets
  • Index usage and effectiveness
  • Storage I/O performance
  • Data processing throughput

Read the full file on GitHub · 325 lines

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. 6d ago First seen · 325 lines · 11 tokens per session scan A 66121bf02a60

Subscribe to this mod's changes

performance-testing is a skill published in the GitHub repository MonumentalSystems/Atlas-Agent-Teams (21 stars, last pushed 29d ago), licensed MIT. It adds 11 tokens to every session and 2,238 once invoked, about $0.0001 per session on Opus 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 2026-09-03.

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