What is codebase-explorer?

A read-only helper for researching and mapping an unfamiliar codebase.

Use it to trace code, find relevant files, and investigate project structure before making changes.

It helps you understand how a project is organised and how its parts connect without changing files.

codebase-explorer — Agent for Claude Code by incubrain/foundry

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.

Clone the repo

git clone --depth 1 https://github.com/incubrain/foundry

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/agents/incubrain/foundry/codebase-explorer/github.svg)](https://agentmods.dev/agents/incubrain/foundry/codebase-explorer)

Your own site

<a href="https://agentmods.dev/agents/incubrain/foundry/codebase-explorer"><img src="https://agentmods.dev/badge/agents/incubrain/foundry/codebase-explorer/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/agents/incubrain/foundry/codebase-explorer"><img src="https://agentmods.dev/badge/agents/incubrain/foundry/codebase-explorer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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 252 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	$0.00000	$0.00252
Opus 5.5	$0.00000	$0.00101
Sonnet 5.5	$0.00000	$0.00050
Haiku 4.5	$0.00000	$0.00025

Measured 2mo ago against content hash c46bf967ffa8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

codebase-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 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/agents/codebase-explorer.md · 33 lines

What it actually says

Codebase Explorer Agent

Deep codebase research and exploration. Read-only — does not modify files.

When to Use

Use this agent when you need to understand how a feature works across the layer, examples, and modules before making changes.

Project Structure

layer/                    → Nuxt layer (core reusable code)
layer/modules/            → Feature modules (events, rss)
examples/foundry/         → Founder Funnel example app
shared/config/            → Shared configuration
shared/types/             → Shared TypeScript types

Research Strategy

Check module AGENTS.md first — each module in layer/modules/ has its own AGENTS.md with file maps and architecture docs
Use file maps to identify key files before reading code
Follow import chains to understand dependencies
Check shared/types/ for type definitions
Check shared/config/ for configuration schemas

Output

Report findings concisely — the main agent needs actionable information, not verbose file dumps. Structure as:

What was found — key files, patterns, dependencies
How it works — brief architecture summary
Recommendations — suggestions for the main agent

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 Changed · -2 lines c46bf967ffa8
2mo ago First seen · 35 lines · 0 tokens per session scan A 37b466275906

Subscribe to this mod's changes

codebase-explorer is an agent published in the GitHub repository incubrain/foundry (79 stars, last pushed 11d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 252 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.

Research building nuxt nuxt4 nuxtjs tailwindcss vue

codebase-explorer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
codebase-explorerincubrain/foundry	Agent	79	11d ago	MIT	A	0	Claude Code
source-forensicsvoidmatcha/ui-clone-skills	Agent	16	1mo ago	Apache-2.0	A	47	Claude Code
atelier-directorluminary19/atelier	Agent	2	4mo ago	none	A	248	Claude Code
forge-modelerluminary19/atelier	Agent	2	4mo ago	none	A	126	Claude Code
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playwright-test-generatormicrosoft/playwright	Agent	99k	yesterday	Apache-2.0	A	151	Claude Code
.NET-Notebook-Migration-Agentmicrosoft/ai-agents-for-beginners	Agent	79k	4d ago	MIT	A	33	Claude Code