backend-latency-profiling

backend-latency-profiling is a skill for Claude Code from FluxonLab/Skillry. It costs 31 tokens per session (2,873 once invoked), scanned A, original, no licence file.

A tool for investigating slow backend software, including response-time percentiles, flame graphs, memory leaks, file-descriptor leaks, Python profiling, and caching. A backend is the server-side part of an application.

In plain words
What is it for?
Use it to study p95 and p99 response times, inspect where processing time is spent, profile Python code, and review caching.
Why use it?
It helps locate the code or resource problem behind slow responses and resource growth.

Skill for Claude Code

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

Part of the skillry-performance-and-cost plugin — 2 skills, 2 agents shipped together

Good fit Use it to study p95 and p99 response times, inspect where processing time is spent, profile Python code, and review caching.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fluxonlab/skillry/322-backend-latency-profiling
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 FluxonLab/Skillry --skill 322-backend-latency-profiling
Clone the repo
git clone --depth 1 https://github.com/FluxonLab/Skillry

Made for: Claude Code.

Or install skillry-performance-and-cost, the plugin that ships this one along with the rest of its 2 skills, 2 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 backend-latency-profiling

README.md
[![agentmods](https://agentmods.dev/badge/skills/fluxonlab/skillry/322-backend-latency-profiling/github.svg)](https://agentmods.dev/skills/fluxonlab/skillry/322-backend-latency-profiling)
Your own site
<a href="https://agentmods.dev/skills/fluxonlab/skillry/322-backend-latency-profiling"><img src="https://agentmods.dev/badge/skills/fluxonlab/skillry/322-backend-latency-profiling/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 backend-latency-profiling

Your own site · 80×15
<a href="https://agentmods.dev/skills/fluxonlab/skillry/322-backend-latency-profiling"><img src="https://agentmods.dev/badge/skills/fluxonlab/skillry/322-backend-latency-profiling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,873 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 $0.00031 $0.02873
Opus 5.5 $0.00012 $0.01149
Sonnet 5.5 $0.00006 $0.00575
Haiku 4.5 $0.00003 $0.00287

Measured 27d ago against content hash f3ed934539d3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

backend-latency-profiling 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 27d 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.

2. **Reproduce under representative load.** Use a load generator at realistic concurrency. Tail latency only appears under contention; a single curl will not surface pool exhaustion or queueing. Warm the service first so
plugins/performance-and-cost/skills/322-backend-latency-profiling/SKILL.md · 162 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

Files

What ships with it

5 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.

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. 27d ago First seen · 162 lines · 31 tokens per session scan A f3ed934539d3

Subscribe to this mod's changes

backend-latency-profiling is a skill published in the GitHub repository FluxonLab/Skillry (6 stars, last pushed 24d ago), with no licence file. It adds 31 tokens to every session and 2,873 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-09-20.