『HOW TO USE CODEX BEYOND THE FIRST PROMPT』のカバーアート

HOW TO USE CODEX BEYOND THE FIRST PROMPT

HOW TO USE CODEX BEYOND THE FIRST PROMPT

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Short summary


Most AI demos stop when something appears on screen. This one starts there.


Dalton Anderson uses OpenAI Codex to turn fictional customer feedback into a working dashboard, then critiques the first output, steers the redesign, and explains the system around reliable agent work: Plan as the map, Goal as the contract, skills as reusable procedures, and evaluations plus stop conditions for agentic loops.


A practical episode for founders, operators, and builders who want better results from Codex without giving up judgment.


### Mobile-first show notes


Most AI demos stop when something appears on screen. This one starts there.


Dalton gives Codex a fictional customer-feedback dataset and asks for a decision-ready dashboard. The first output works, but it is not good enough. That becomes the real lesson.


This episode shows how to move from a one-shot prompt to a workflow you can inspect, steer, and verify.


You will learn:


- Why Plan is the map and Goal is the contract

- The four parts of a strong goal: outcome, context, constraints, and done-when evidence

- When a repeatable workflow should become a skill

- How clear names keep a growing skill library usable

- Why every agentic loop needs an evaluation and a hard stop

- Where human judgment still matters


The demonstration uses fictional data. No outreach is sent.


## Official OpenAI resources


- [Codex use cases](https://developers.openai.com/codex/use-cases)

- [Build skills](https://learn.chatgpt.com/docs/build-skills)

- [Build plugins](https://learn.chatgpt.com/docs/build-plugins)

- [Subagents](https://learn.chatgpt.com/docs/agent-configuration/subagents)

- [AGENTS.md](https://learn.chatgpt.com/docs/agent-configuration/agents-md)

- [Follow a goal](https://learn.chatgpt.com/use-cases/follow-goals)

- [Scheduled tasks](https://learn.chatgpt.com/docs/automations)

- [Git worktrees](https://learn.chatgpt.com/docs/environments/git-worktrees)

- [OpenAI Codex repository](https://github.com/openai/codex)

- [OpenAI Plugins repository](https://github.com/openai/plugins)


Note: the older [openai/skills repository](https://github.com/openai/skills) is deprecated and now directs readers to OpenAI Plugins.


## Skill repositories worth exploring


- [Anthropic Skills](https://github.com/anthropics/skills): official Claude skill examples and templates

- [Superpowers](https://github.com/obra/superpowers): a cross-agent software development workflow and skill collection

- [Microsoft Skills](https://github.com/microsoft/skills): skills and custom agents for Microsoft developer workflows

- [Microsoft Learn Agent Skills](https://github.com/MicrosoftDocs/Agent-Skills): Microsoft and Azure skills grounded in Learn documentation

- [Gemini CLI](https://github.com/google-gemini/gemini-cli): Google's open-source coding agent with Agent Skills support

- [Gemini CLI Agent Skills guide](https://geminicli.com/docs/cli/using-agent-skills/)

- [Agent Skills specification](https://github.com/agentskills/agentskills): the open format behind portable skills

- [Vercel Skills](https://github.com/vercel-labs/skills): a cross-agent CLI for discovering, installing, and sharing skills


Install selectively. Read a skill before trusting it, understand the tools and permissions it can use, and test it on bounded work first.


## Chapters


00:00 Why this episode exists

01:45 Turning fictional feedback into a dashboard

02:29 Commands, context, compact, goals, and Plan

04:16 What the first plan is doing

07:05 Steering the build with butter yellow

09:03 Reviewing the first dashboard

10:37 Plan is the map, Goal drives the work

15:54 An honest review of the redesign

17:23 Building a Goal and the four-part prompt formula

21:08 Commands, skills, and reusable workflows

24:57 Naming skills so they stay usable

26:34 Broad threads and focused projects

28:27 A simple context-and-constraints analogy

30:52 Keeping agentic loops safe

32:21 Closing


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