How to hold every Codex response to plain language rules with Iso 24495

Who it is forA developer who uses Codex CLI on a team project and wants consistent, plain answers from the agent.

The problemAgents default to filler preambles, long sentences, and passive voice unless their instructions say otherwise.

The outcomeCodex applies the output style to each response in that project.

What you need first

An agent that reads the Agent Skills format, such as Claude Code or Codex CLI
Access to GitHub to add the marketplace from its HTTPS address
Bun, only if you want to run the Part 4 tooling

Steps

Add the marketplace: codex plugin marketplace add https://github.com/GaZmagik/iso-24495.git
Install the plugin: codex plugin add iso-24495-plain-language@iso-24495
Add this line to your project's AGENTS.md: Apply iso-24495-style to every response.
Start a new Codex session and check that a response has no filler opening and uses short sentences.

Prompt for your agent

Using the iso-24495 repository, confirm that the iso-24495-style skill is installed for this project and that AGENTS.md names it. Answer a test question in plain language with no filler opening, then report which style rules the answer follows. Verify the AGENTS.md line is present before you report success.

Caveat. The README notes that an AGENTS.md inside a plugin is ignored, so the line must go in your project's own AGENTS.md or ~/.codex/AGENTS.md.