explain

A command for explaining a code file, function, or programming concept in clear, structured language. It examines purpose, inputs, processing, outputs, side effects, patterns, dependencies, and possible pitfalls.

In plain words
What is it for?
Explaining how code works, tracing data through it, describing algorithms and design patterns, identifying dependencies and side effects, and highlighting non-obvious behavior or edge cases.
Why use it?
It helps a reader understand unfamiliar code without having to infer its behavior from the implementation alone.

Command

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 commands/rohitg00/awesome-claude-code-toolkit/explain
Clone the repo
git clone --depth 1 https://github.com/rohitg00/awesome-claude-code-toolkit
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 362 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 $0.00000 $0.00362
Opus 5 $0.00000 $0.00181
Sonnet 5 $0.00000 $0.00072
Haiku 4.5 $0.00000 $0.00036

Measured 2d ago against content hash cdea455a5552, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 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.

plugins/code-explainer/commands/explain.md · 50 lines

What it actually says

Explain a code file, function, or concept in clear, structured language.

Steps

  1. Read the target code (file path, function name, or code block).
  2. Determine the audience level from context (junior, mid, senior, non-technical).
  3. Analyze the code structure:
    • Purpose: What problem does this code solve?
    • Inputs: What data does it receive and from where?
    • Processing: What transformations or logic does it apply?
    • Outputs: What does it produce or modify?
    • Side effects: What external state does it change?
  4. Break down complex sections:
    • Explain algorithms step by step.
    • Clarify language-specific idioms or patterns.
    • Describe the data flow through the code.
  5. Identify design patterns in use (Observer, Strategy, Factory, etc.).
  6. Note any non-obvious behavior, gotchas, or edge cases.
  7. Provide analogies for complex concepts when appropriate.

Format

## <File/Function Name>

### Purpose
<one-sentence summary>

### How It Works
1. <step-by-step explanation>

### Key Concepts
- <pattern/concept>: <explanation>

### Gotchas
- <non-obvious behavior to be aware of>

### Dependencies
- <what this code depends on>
- <what depends on this code>

Rules

  • Explain the "why" not just the "what"; anyone can read the code.
  • Use concrete examples with real values from the codebase.
  • Avoid jargon unless explaining it; match the audience level.
  • Keep explanations under 100 lines; link to deeper resources for complex topics.
  • Do not restate code as prose; explain the intent and reasoning behind it.
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 · 50 lines · 0 tokens per session scan A cdea455a5552

Subscribe to this mod's changes

explain is a command published in the GitHub repository rohitg00/awesome-claude-code-toolkit (2,578 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 362 tokens. 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.