A code-explanation guide that traces a file, function, class, or feature through a codebase.

Use it when onboarding to a project, investigating a feature, or understanding how a particular piece of code works.

It turns unfamiliar code into a clear description of its purpose, relationships, flow, and important edge cases.

How Flexonze/claude-init configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Flexonze/claude-init. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Flexonze/claude-init/main/.claude/skills/explain/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/Flexonze/claude-init

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/flexonze/claude-init/explain/github.svg)](https://agentmods.dev/skills/flexonze/claude-init/explain)

Your own site

<a href="https://agentmods.dev/skills/flexonze/claude-init/explain"><img src="https://agentmods.dev/badge/skills/flexonze/claude-init/explain/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/flexonze/claude-init/explain"><img src="https://agentmods.dev/badge/skills/flexonze/claude-init/explain.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 281 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.

Model	Per session	Once invoked
Fable 5.1	$0.00013	$0.00281
Opus 5.5	$0.00005	$0.00112
Sonnet 5.5	$0.00003	$0.00056
Haiku 4.5	$0.00001	$0.00028

Measured 2mo ago against content hash 8b81a3debe67, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

explain 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 2mo 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/explain/SKILL.md · 40 lines

What it actually says

Explain

Provide a clear explanation of how something in the codebase works.

Instructions

Identify what to explain: Use $ARGUMENTS to determine the target
- File path → explain that file's purpose and how it works
- Function/class name → find and explain that specific code
- Feature name → trace through the codebase to explain the feature end-to-end
Gather context
- Read the relevant code
- Identify dependencies and relationships
- Look at how it's used (callers, imports)
- Check for related tests that show intended behavior
Explain clearly
- Start with a high-level summary (1-2 sentences)
- Break down the key components
- Explain the flow/logic step by step
- Note any important patterns or design decisions
- Mention edge cases or gotchas if relevant

Guidelines

Adjust depth based on complexity—simple code needs brief explanations
Use concrete examples from the code when helpful
Reference specific line numbers for key logic
If the target is ambiguous, ask for clarification
Avoid restating code literally; explain the why and how

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.

2mo ago First seen · 40 lines · 13 tokens per session scan A 8b81a3debe67

Subscribe to this mod's changes

explain is a skill published in the GitHub repository Flexonze/claude-init (10 stars, last pushed 7mo ago), licensed MIT. It adds 13 tokens to every session and 281 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 2026-08-31.

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claude-init: Skill for Claude Code