autoloop

An automated loop that inspects a codebase, chooses a high-impact improvement, applies it, measures the result, and repeats or reverts the change. It needs a defined objective and a command that measures success.

In plain words
What is it for?
Use it for goals such as increasing test coverage, reducing lint errors, improving performance, or strengthening security.
Why use it?
It removes the need to manually coordinate repeated improvement experiments and provides a way to keep only changes that improve the chosen measurement.

Skill for Claude CodeCodex

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/5uck1ess/devkit/autoloop
Any agent
npx skills add 5uck1ess/devkit --skill autoloop
Clone the repo
git clone --depth 1 https://github.com/5uck1ess/devkit

Made for: Claude Code, Codex.

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 688 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00041 $0.00688
Opus 5 $0.00020 $0.00344
Sonnet 5 $0.00008 $0.00138
Haiku 4.5 $0.00004 $0.00069

Measured yesterday against content hash 522b03143061, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

autoloop 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 yesterday.

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.

skills/autoloop/SKILL.md · 67 lines

How it starts

The opening of the file, as written. The whole thing — 67 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Autoloop

Autonomous codebase improvement inspired by karpathy/autoresearch. Audit the codebase, pick the highest-impact change, fix it, measure the result, keep or revert, repeat.

Before Starting

Use AskUserQuestion to gather these inputs. Do NOT proceed without answers.

1. Objective

Ask: "What do you want to improve? (e.g., test coverage, lint errors, performance, security)"

2. Metric Command

Ask: "What command measures success? (e.g., go test -cover ./..., npx jest --coverage, ruff check . | wc -l)"

If the user doesn't have one, detect the stack and suggest:

Stack Default metric Direction
Go go test -cover ./... higher-is-better (coverage %)
TypeScript npx jest --coverage higher-is-better (coverage %)
Python pytest --cov higher-is-better (coverage %)
Rust cargo test higher-is-better (pass count)
Go (lint) go vet ./... 2>&1 | wc -l lower-is-better (error count)
Any (lint) <linter> . 2>&1 | wc -l lower-is-better (error count)

Confirm with the user: "I'll use <command> with . Correct?"

3. Direction

If not obvious from the metric, ask: "Is higher or lower better for this metric?"

4. Iterations

Ask: "How many improvement cycles? (default: 10, max recommended: 50)"

5. Scope (optional)

Ask: "Any scope constraints? (e.g., only src/engine/, only .py files, or everything)"

If the user says "everything" or skips, leave scope open.

Invoke the Workflow

Start the workflow via the devkit engine:

Assemble the input as a single string: "<objective> | metric: <command> | direction: <higher/lower>-is-better | iterations: <N> | scope: <constraint or 'all'>".

Use the devkit_start tool with workflow: "autoloop" and input: "{input}".

Then follow each step the engine returns. Call devkit_advance after completing each step. The engine controls step order, gates, and loops. Do NOT skip steps.

Read the full file on GitHub · 67 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. yesterday First seen · 67 lines · 41 tokens per session scan A 522b03143061

Subscribe to this mod's changes

autoloop is a skill published in the GitHub repository 5uck1ess/devkit (5 stars, last pushed 13d ago), licensed MIT. It adds 41 tokens to every session and 688 once invoked, about $0.0002 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.

Related

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