large-file-refactor

large-file-refactor is a skill for Claude Code, Codex from PaulRBerg/agent-skills. It costs 27 tokens per session (826 once invoked), scanned A, original, MIT.

A review of very large source files to find candidates for splitting into smaller, more focused files.

In plain words
What is it for?
Use it to scan a project, identify the three largest matching files, and create plans for safer refactoring. Generated and dependency files are skipped unless included.
Why use it?
Large files can be harder to understand, change, test, and own. The review considers whether splitting is justified by related code, dependencies, ownership, and change risk.

Skill for Claude CodeCodex

Written for Claude Code and Codex: disable-model-invocation in frontmatter, but also agents/openai.yaml present.

Good fit Use it to scan a project, identify the three largest matching files, and create plans for safer refactoring. Generated and dependency files are skipped unless included.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/paulrberg/agent-skills/large-file-refactor
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 PaulRBerg/agent-skills --skill large-file-refactor
Clone the repo
git clone --depth 1 https://github.com/PaulRBerg/agent-skills

Made for: Claude Code, Codex.

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 large-file-refactor

README.md
[![agentmods](https://agentmods.dev/badge/skills/paulrberg/agent-skills/large-file-refactor/github.svg)](https://agentmods.dev/skills/paulrberg/agent-skills/large-file-refactor)
Your own site
<a href="https://agentmods.dev/skills/paulrberg/agent-skills/large-file-refactor"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/large-file-refactor/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 large-file-refactor

Your own site · 80×15
<a href="https://agentmods.dev/skills/paulrberg/agent-skills/large-file-refactor"><img src="https://agentmods.dev/badge/skills/paulrberg/agent-skills/large-file-refactor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 27 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 826 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 $0.00027 $0.00826
Opus 5.5 $0.00011 $0.00330
Sonnet 5.5 $0.00005 $0.00165
Haiku 4.5 $0.00003 $0.00083

Measured 1mo ago against content hash 191991ae7d9e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

large-file-refactor 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 1mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/large-file-refactor.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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/large-file-refactor/SKILL.md · 81 lines

How it starts

The opening of the file, as written. The whole thing — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Large File Refactor

This skill is coordination-exempt: skip the ai-coord gate for its declared work.

If a slash or dollar invocation already added these instructions to the conversation, follow them directly. In that case, do not invoke this skill again through a skill tool.

Use LOC thresholds to discover candidates, then decide whether a split is justified by cohesion, coupling, ownership, and change risk. Source files match above 1000 LOC. Test files use a relaxed 2000 LOC discovery threshold.

Arguments

  • path: Optional file or directory to scan. Default: current working directory.
  • --include-generated: Include generated, vendored, dependency, and build-output paths that are skipped by default.

Workflow

  1. Resolve the skill directory, then run the helper from the target repository:

    uv run "<skill-dir>/scripts/large-file-refactor.py" [path] [--include-generated]
    
  2. Preserve the helper's Markdown table as the exhaustive report. Do not omit matching rows, even when the refactor plan only covers a subset.

  3. If the helper reports no threshold matches, stop after the report. A match is a candidate, not proof that the file should be split.

  4. Draft a refactor plan for the 3 largest files only, unless the user explicitly requested another count.

  5. For each candidate, rank split value by mixed responsibilities, change frequency/risk, coupling, and testability. Use whichever semantic symbol/reference tooling is available. When Serena is installed, prefer it:

    • Inspect symbol overviews, references, imports, and relevant history.
    • Use the evidence to choose extraction boundaries, target module names, migration order, and test coverage.
  6. This workflow defaults to a report and plan. Implement only when the user's request already authorizes execution or the user subsequently approves it. Do not require a separate request for an unchanged, already authorized outcome.

Refactor Plan Format

For each selected file, include:

Read the full file on GitHub · 81 lines

Files

What ships with it

2 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. 1mo ago Changed · +1 tokens per session 191991ae7d9e
  2. 1mo ago Changed · +1 lines cc3a791f02bc
  3. 1mo ago Changed 56b4a43b92dd
  4. 2mo ago First seen · 80 lines · 26 tokens per session scan A 2ac6250fe5c4

Subscribe to this mod's changes

large-file-refactor is a skill published in the GitHub repository PaulRBerg/agent-skills (104 stars, last pushed 2d ago), licensed MIT. It adds 27 tokens to every session and 826 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 2026-08-30.

Related

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