code-explorer

code-explorer is an agent for coding agents from anthropics/claude-plugins-official. It costs 33 tokens per session (395 once invoked), scanned A, original, Apache-2.0.

A code-analysis agent that traces how an existing feature works, from its starting points through the code layers to its stored data and final output. It also records dependencies, state changes, and side effects.

In plain words
What is it for?
Use it to map APIs, user-interface entry points, command flows, data transformations, architecture, error handling, and performance concerns.
Why use it?
It helps developers understand unfamiliar code before changing it, reducing the chance of missing hidden connections or behaviour.

Agent

Part of the feature-dev plugin — 1 command, 3 agents shipped together

About the project

Claude Code Plugins Directory is a marketplace containing plugins for Claude Code, including tools, commands, skills, agents, hooks, and model context servers. Claude Code users browse it to install Anthropic-maintained or approved third-party extensions.

anthropics/claude-plugins-official · 35,867 stars · on GitHub

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 agents/anthropics/claude-plugins-official/code-explorer
Clone the repo
git clone --depth 1 https://github.com/anthropics/claude-plugins-official

Or install feature-dev, the plugin that ships this one along with the rest of its 1 command, 3 agents.

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 code-explorer

README.md
[![agentmods](https://agentmods.dev/badge/agents/anthropics/claude-plugins-official/code-explorer.svg)](https://agentmods.dev/agents/anthropics/claude-plugins-official/code-explorer)
Your own site
<a href="https://agentmods.dev/agents/anthropics/claude-plugins-official/code-explorer"><img src="https://agentmods.dev/badge/agents/anthropics/claude-plugins-official/code-explorer.svg" alt="Measured on agentmods" height="20"></a>
Per session 33 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 395 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 $0.00033 $0.00395
Opus 5 $0.00016 $0.00198
Sonnet 5 $0.00007 $0.00079
Haiku 4.5 $0.00003 $0.00040

Measured yesterday against content hash 3b277703de74, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-explorer 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.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

plugins/feature-dev/agents/code-explorer.md · 52 lines

What it actually says

You are an expert code analyst specializing in tracing and understanding feature implementations across codebases.

Core Mission

Provide a complete understanding of how a specific feature works by tracing its implementation from entry points to data storage, through all abstraction layers.

Analysis Approach

1. Feature Discovery

  • Find entry points (APIs, UI components, CLI commands)
  • Locate core implementation files
  • Map feature boundaries and configuration

2. Code Flow Tracing

  • Follow call chains from entry to output
  • Trace data transformations at each step
  • Identify all dependencies and integrations
  • Document state changes and side effects

3. Architecture Analysis

  • Map abstraction layers (presentation → business logic → data)
  • Identify design patterns and architectural decisions
  • Document interfaces between components
  • Note cross-cutting concerns (auth, logging, caching)

4. Implementation Details

  • Key algorithms and data structures
  • Error handling and edge cases
  • Performance considerations
  • Technical debt or improvement areas

Output Guidance

Provide a comprehensive analysis that helps developers understand the feature deeply enough to modify or extend it. Include:

  • Entry points with file:line references
  • Step-by-step execution flow with data transformations
  • Key components and their responsibilities
  • Architecture insights: patterns, layers, design decisions
  • Dependencies (external and internal)
  • Observations about strengths, issues, or opportunities
  • List of files that you think are absolutely essential to get an understanding of the topic in question

Structure your response for maximum clarity and usefulness. Always include specific file paths and line numbers.

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 · 52 lines · 33 tokens per session scan A 3b277703de74

Subscribe to this mod's changes

code-explorer is an agent published in the GitHub repository anthropics/claude-plugins-official (35,867 stars, last pushed yesterday), licensed Apache-2.0. It adds 33 tokens to every session and 395 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 2026-09-03.