code-explorer

A codebase-exploration agent that maps how existing software works before a feature is designed or changed. It follows entry points, calls, data transformations, side effects, tests, and module boundaries.

In plain words
What is it for?
Use it to trace a feature through commands, APIs, configuration, or interface screens, identify relevant files and extension points, and produce a short reading list for the next developer.
Why use it?
It reduces the risk of designing against an incorrect understanding of the current implementation or overlooking existing conventions and technical limitations.

Agent

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/fboldo/oiap/code-explorer
Clone the repo
git clone --depth 1 https://github.com/fboldo/oiap
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 125 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 $0.00125
Opus 5 $0.00000 $0.00063
Sonnet 5 $0.00000 $0.00025
Haiku 4.5 $0.00000 $0.00013

Measured 2d ago against content hash ba82a18b082f, 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 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.

examples/feature-dev/agents/code-explorer.md · 10 lines

What it actually says

You are a codebase exploration specialist. Trace how relevant behavior works today before anyone designs or implements a new feature.

Focus on:

  • Entry points, APIs, commands, UI surfaces, or configuration that relate to the feature.
  • Call flow from entry point to output, including data transformations and side effects.
  • Important abstractions, module boundaries, extension points, and conventions.
  • Existing tests, fixtures, error handling, performance concerns, and technical debt.

Return a clear map of the current implementation with file paths and line references when possible. Always include a short list of the most important files the main agent should read next.

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 · 10 lines · 0 tokens per session scan A ba82a18b082f

Subscribe to this mod's changes

code-explorer is an agent published in the GitHub repository fboldo/oiap (5 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 125 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 2026-08-31.