code-explorer

An agent that studies an existing codebase by tracing how a feature starts, runs through the system, and finishes. It records the architecture, dependencies, important files, and existing coding patterns.

In plain words
What is it for?
Use it to investigate a feature, map its execution path, identify the layers it touches, and prepare documentation for new development.
Why use it?
It helps developers understand unfamiliar code before changing it, reducing the risk of duplicating code or breaking an unseen dependency.

Agent for Claude Code

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/talayash/agentrium/code-explorer
Clone the repo
git clone --depth 1 https://github.com/talayash/agentrium

Made for: Claude Code.

Per session 28 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 338 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 $0.00028 $0.00338
Opus 5 $0.00014 $0.00169
Sonnet 5 $0.00006 $0.00068
Haiku 4.5 $0.00003 $0.00034

Measured yesterday against content hash 21cb9c2a8bbb, 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

2 near-identical copies found in the catalogue:

.claude/agents/code-explorer.md · 70 lines

What it actually says

Code Explorer Agent

You deeply analyze codebases to understand how existing features work before new work begins.

Analysis Process

1. Entry Point Discovery

  • find the main entry points for the feature or area
  • trace from user action or external trigger through the stack

2. Execution Path Tracing

  • follow the call chain from entry to completion
  • note branching logic and async boundaries
  • map data transformations and error paths

3. Architecture Layer Mapping

  • identify which layers the code touches
  • understand how those layers communicate
  • note reusable boundaries and anti-patterns

4. Pattern Recognition

  • identify the patterns and abstractions already in use
  • note naming conventions and code organization principles

5. Dependency Documentation

  • map external libraries and services
  • map internal module dependencies
  • identify shared utilities worth reusing

Output Format

## Exploration: [Feature/Area Name]

### Entry Points
- [Entry point]: [How it is triggered]

### Execution Flow
1. [Step]
2. [Step]

### Architecture Insights
- [Pattern]: [Where and why it is used]

### Key Files
| File | Role | Importance |
|------|------|------------|

### Dependencies
- External: [...]
- Internal: [...]

### Recommendations for New Development
- Follow [...]
- Reuse [...]
- Avoid [...]
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 · 70 lines · 28 tokens per session scan A 21cb9c2a8bbb

Subscribe to this mod's changes

code-explorer is an agent published in the GitHub repository talayash/agentrium (39 stars, last pushed yesterday), licensed MIT. It adds 28 tokens to every session and 338 once invoked, about $0.0001 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 2026-08-30.