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understand-file

understand-file is a skill for Claude Code, Codex from tomwangowa/agent-skills. It costs 30 tokens per session (2,720 once invoked), scanned A, original, no licence file.

A skill for explaining a source file within the context of its repository.

In plain words
What is it for?
It is for describing a file’s architecture, callers, data flow, tests, and limits on how it should be changed.
Why use it?
It helps a developer understand a file’s role and constraints instead of reading the file in isolation.

Skill for Claude CodeCodex

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

not rated 2repo today A scan 30 tokens no licence

Good fit It is for describing a file’s architecture, callers, data flow, tests, and limits on how it should be changed.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/tomwangowa/agent-skills/understand-file
View source ↗ tomwangowa/agent-skills
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 tomwangowa/agent-skills --skill understand-file
Clone the repo
git clone --depth 1 https://github.com/tomwangowa/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 understand-file

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

Your own site · 80×15
<a href="https://agentmods.dev/skills/tomwangowa/agent-skills/understand-file"><img src="https://agentmods.dev/badge/skills/tomwangowa/agent-skills/understand-file.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,720 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 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 $0.00030 $0.02720
Opus 5.5 $0.00012 $0.01088
Sonnet 5.5 $0.00006 $0.00544
Haiku 4.5 $0.00003 $0.00272

Measured 1mo ago against content hash 81b3cfd6a22e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

understand-file 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.

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.

understand-file/SKILL.md · 434 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

Files

What ships with it

1 file 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 First seen · 434 lines · 30 tokens per session scan A 81b3cfd6a22e

Subscribe to this mod's changes

understand-file is a skill published in the GitHub repository tomwangowa/agent-skills (2 stars, last pushed today), with no licence file. It adds 30 tokens to every session and 2,720 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 2026-10-06.

Learning and teaching
Related

understand-file compared with skills from other repositories

understand-file next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
understand-filetomwangowa/agent-skillsSkill2todaynoneA30Claude Code, Codex
hr-onboardingnexu-io/open-designSkill106ktodayApache-2.0A62Claude Code, Codex
book-mirrorgarrytan/gbrainSkill32ktodayMITA138Claude Code
exam-forecastanthropics/claude-for-legalSkill9.9ktodayApache-2.0A73Claude Code
lean-formalizewanshuiyin/Auto-claude-code-research-in-sleepSkill19kyesterdayMITA81Claude Code
deck-course-modulenexu-io/html-anythingSkill9.4kyesterdayApache-2.0A25Claude Code, Codex
eli5companion-inc/feynmanSkill10k7d agoMITA63Claude Code, Codex