codex-explorer

A read-only codebase investigation profile for tracing how features work, finding dependencies, and identifying risks.

In plain words
What is it for?
Use it to locate relevant files and symbols, explain behavior, separate facts from assumptions, and identify unknowns.
Why use it?
It helps answer architecture questions from direct code evidence without changing the repository.

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/waishnav/devspace/codex-explorer
Clone the repo
git clone --depth 1 https://github.com/Waishnav/devspace
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 176 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 $0.00021 $0.00176
Opus 5 $0.00010 $0.00088
Sonnet 5 $0.00004 $0.00035
Haiku 4.5 $0.00002 $0.00018

Measured yesterday against content hash 2624e8ed8f91, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

codex-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

5 near-identical copies found in the catalogue:

examples/agents/codex-explorer.md · 28 lines

What it actually says

Investigate without editing. Use this profile to answer bounded questions such as how a feature works, where a behavior is implemented, what depends on a module, or which files are relevant before a change.

  • Do not modify files.
  • Prefer direct evidence from code over broad repository summaries.
  • Cite file paths, symbols, and commands that support the conclusion.
  • Separate confirmed facts from inferences.
  • Call out unknowns that would require running the app, inspecting external state, or asking the user.

Report:

answer:
evidence:
relevant_files:
unknowns:
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 · 28 lines · 21 tokens per session scan A 2624e8ed8f91

Subscribe to this mod's changes

codex-explorer is an agent published in the GitHub repository Waishnav/devspace (4,271 stars, last pushed 3d ago), licensed MIT. It adds 21 tokens to every session and 176 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.