perf-check

perf-check is a skill for Claude Code from josstei/maestro-orchestrate. It costs 18 tokens per session (172 once invoked), scanned A, original, Apache-2.0.

A code-performance assessment workflow for finding slow areas, regressions, and possible improvements. It compares available measurements with code analysis and separates measured problems from guesses.

In plain words
What is it for?
Use it to define a performance target, establish a baseline, inspect hotspots and loops, rank fixes, and plan validation.
Why use it?
It reduces the risk of making changes that do not address the actual bottleneck. It also identifies when more measurements are needed.

Skill for Claude Code

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

Part of the maestro plugin — 19 skills, 33 agents, 1 MCP server shipped together

Good fit Use it to define a performance target, establish a baseline, inspect hotspots and loops, rank fixes, and plan validation.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/josstei/maestro-orchestrate/perf-check
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 josstei/maestro-orchestrate --skill perf-check
Clone the repo
git clone --depth 1 https://github.com/josstei/maestro-orchestrate

Made for: Claude Code.

Or install maestro, the plugin that ships this one along with the rest of its 19 skills, 33 agents, 1 MCP server.

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 perf-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/josstei/maestro-orchestrate/perf-check/github.svg)](https://agentmods.dev/skills/josstei/maestro-orchestrate/perf-check)
Your own site
<a href="https://agentmods.dev/skills/josstei/maestro-orchestrate/perf-check"><img src="https://agentmods.dev/badge/skills/josstei/maestro-orchestrate/perf-check/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 perf-check

Your own site · 80×15
<a href="https://agentmods.dev/skills/josstei/maestro-orchestrate/perf-check"><img src="https://agentmods.dev/badge/skills/josstei/maestro-orchestrate/perf-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 172 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.
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 $0.00018 $0.00172
Opus 5.5 $0.00007 $0.00069
Sonnet 5.5 $0.00004 $0.00034
Haiku 4.5 $0.00002 $0.00017

Measured 10d ago against content hash 7a2ce9c15daa, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

perf-check 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 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.

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.

claude/skills/perf-check/SKILL.md · 27 lines

What it actually says

Maestro Perf Check

Call get_skill_content with resources: ["architecture"].

Protocol

Before delegating, call get_skill_content with resources: ["delegation"] and follow the returned methodology.

Workflow

  1. Define the performance target or pain point
  2. Establish the current baseline from available code, metrics, or reproducible commands
  3. Identify likely hotspots, structural bottlenecks, and hot loops through code analysis
  4. Prioritize fixes by expected impact versus implementation cost
  5. Report measurement gaps when hard evidence is unavailable and propose a validation plan

Constraints

  • Avoid optimization advice that is disconnected from the observed bottleneck
  • Distinguish measured issues from inferred ones
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 · 27 lines · 18 tokens per session scan A 7a2ce9c15daa

Subscribe to this mod's changes

perf-check is a skill published in the GitHub repository josstei/maestro-orchestrate (484 stars, last pushed 6d ago), licensed Apache-2.0. It adds 18 tokens to every session and 172 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-10-07.

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