A coding assistant that turns plain-language requests into code and helps explain, complete, translate, review, and fix programs. It is designed to work through the OpenAI Codex command-line tool.

Use it to build functions and algorithms, translate code between languages, generate documentation, detect bugs, and review implementation ideas.

It reduces the effort of starting unfamiliar code, understanding existing logic, and finding problems in a program.

codex — Agent by ruizrica

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/ruizrica/toolkit/codex

Clone the repo

git clone --depth 1 https://github.com/ruizrica/toolkit

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 820 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.

Model	Per session	Once invoked
Fable 5	$0.00000	$0.00820
Opus 5	$0.00000	$0.00410
Sonnet 5	$0.00000	$0.00164
Haiku 4.5	$0.00000	$0.00082

Measured yesterday against content hash ecd4193e7458, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

codex 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.

docs/agents/codex.md · 127 lines

How it starts

The opening of the file, as written. The whole thing — 127 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Codex Agent

A specialized agent that interfaces with OpenAI Codex CLI to provide advanced code generation and analysis capabilities. Excels at understanding natural language descriptions and converting them into working code.

When to Use

Natural language to code conversion
Complex algorithm implementation
Code explanation or documentation
Multi-language code translation
Intelligent code completion beyond basic IDE features
Bug fixing with AI assistance
Code review and analysis tasks
Prototype development from descriptions

Capabilities

Natural Language to Code - Converting descriptions into working code
Code Explanation - Breaking down complex algorithms and logic
Code Completion - Intelligent autocompletion and suggestions
Bug Detection - Identifying and fixing code issues
Code Translation - Converting between programming languages
Documentation Generation - Creating clear code documentation
Algorithm Implementation - Building efficient solutions to problems

Invocation

/toolkit:codex-agent Create a function that validates email addresses using regex

Examples

Code Generation:

Prompt: "Create a Python function that validates email addresses using proper regex patterns"

Code Explanation:

Prompt: "Explain what this recursive algorithm does step by step"

Code Translation:

Prompt: "Convert this Python function to JavaScript while maintaining functionality"

Command Patterns

Basic Code Generation

codex "Create a Python function that [description]"

Code Explanation

codex explain --code="[code snippet]" --language="python"

Bug Fixing

codex fix --file="buggy_code.py" --error="[error description]"

Code Translation

codex translate --from="python" --to="javascript" --code="[code]"

Documentation Generation

codex document --file="functions.py" --style="google"

Read the full file on GitHub · 127 lines

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.

yesterday First seen · 127 lines · 0 tokens per session scan A ecd4193e7458

Subscribe to this mod's changes

codex is an agent published in the GitHub repository ruizrica/toolkit (5 stars, last pushed 17d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 820 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.

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codex