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skill CX Codex GP ChatGPT official · OpenAI

agents-sdk · openai — Codex skill: build OpenAI Agents SDK apps

Builds, runs, and tests OpenAI Agents SDK apps from Codex. Turns a prompt, repo, or session into a working agent with tools and eval tests.

Install into Codex · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add openai/plugins --skill agents-sdk -a codex
Open on GitHub

What agents-sdk does

The skill creates Agents SDK apps from a prompt, existing repository, or Codex session history. It reads OpenAI docs before building, writes Python code (or TypeScript on request), adds function tools via @function_tool, and provides isolated execution through SandboxAgent when the agent needs file or shell access. Interaction diagrams are generated directly as PNG files.

Each app gets a structure with agent.py, main.py, and evals/, docs/, skills/ folders. Eval tests check the real agent path, not just contracts: tool calls, handoffs, edge cases. HTTP apps start with uv run python main.py, read the PORT variable, and expose /health for readiness checks. Before running, the skill requires confirmation of OPENAI_API_KEY access through a separate gate — a prompt to verify the key is in the environment.

What it helps with

  • build an Agents SDK agent from a prompt or idea
  • add eval tests to verify agent behavior
  • turn Codex session history into a runnable app
  • deploy an agent through Deployment Manager
  • isolate shell commands and file operations in a sandbox

Example prompts for the agent

  • Build an Agents SDK agent that checks order status via API and returns JSON
  • Add eval cases for `agent.py`: verify tool call and API error handling
  • Deploy this app locally through Deployment Manager

How to install agents-sdk

1Skills CLI (Vercel)

npx skills add openai/plugins --skill agents-sdk -a codex

2Manually: put the files in place

.agents/skills/agents-sdk/SKILL.md

For all projects use ~/.agents/skills/

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Questions about agents-sdk

How to install agents-sdk in Codex?

Run npx skills add openai/plugins --skill agents-sdk in the terminal. The skill will appear in .agents/skills/agents-sdk/.

What does agents-sdk do?

Creates OpenAI Agents SDK apps: writes agent code, adds tools and sandbox, generates eval tests, and deploys through Deployment Manager. Works with Python and TypeScript.

What does agents-sdk require?

An OPENAI_API_KEY environment variable for API calls. The skill will request confirmation of key access before running the agent. For Python projects, it uses uv and the openai-agents dependency.

See also

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