auto-performance

A code-optimization workflow that measures a reproducible starting point, finds the slow parts, changes them one at a time, and measures again. It keeps a change only when the speed improvement is real and correctness still holds.

In plain words
What is it for?
It is for profiling code, improving identified bottlenecks, benchmarking each change, and stopping when the target or useful improvement has been reached.
Why use it?
It prevents performance work based on guesses or noisy measurements from making code more complicated without a reliable benefit.

Skill for Claude CodeCodex

Part of the autonomous-engineering plugin — 18 skills shipped together

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.

agentmods
npx agentmods add skills/ulpi-io/autonomous-engineering/auto-performance
Any agent
npx skills add ulpi-io/autonomous-engineering --skill auto-performance
Clone the repo
git clone --depth 1 https://github.com/ulpi-io/autonomous-engineering

Made for: Claude Code, Codex.

Or install autonomous-engineering, the plugin that ships this one along with the rest of its 18 skills.

Per session 72 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,819 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00072 $0.01819
Opus 5 $0.00036 $0.00910
Sonnet 5 $0.00014 $0.00364
Haiku 4.5 $0.00007 $0.00182

Measured 2d ago against content hash 4d9e8db10818, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

auto-performance 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 2d 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.

auto-performance/SKILL.md · 148 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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. 2d ago First seen · 148 lines · 72 tokens per session scan A 4d9e8db10818

Subscribe to this mod's changes

auto-performance is a skill published in the GitHub repository ulpi-io/autonomous-engineering (2 stars, last pushed 15d ago), with no licence file. It adds 72 tokens to every session and 1,819 once invoked, about $0.0004 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 2026-08-31.

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