Post to YouTube from Codex

Codex drafts it. You approve it. PostDelegate posts it.YouTube: Video uploads with a title, visibility, thumbnail and tags.

How to post to YouTube from Codex

Add PostDelegate to Codex. Add the server to ~/.codex/config.toml as below. Run codex mcp login postdelegate and sign in in your browser.
~/.codex/config.toml
```
[mcp_servers.postdelegate]
url = "https://app.postdelegate.com/mcp-oauth-dynamic"
```
Connect YouTube in PostDelegate. On the calendar page choose Add Channel, then YouTube. Sign in with Google, approve the permissions and, if your Google account has more than one channel, choose the one to connect.
Ask Codex for a draft. Describe the post in plain words. Codex checks your YouTube channel's rules, creates the post and sends back a preview link.

Teach Codex the posting rules

Add PostDelegate’s AGENTS.md to your repository, so Codex knows the MCP tools, the REST API and the safety rules when it works there. Agent files has the steps.

What to ask Codex

Mention any YouTube setting in plain words and Codex fills it in. Codex can also read text files in your project, such as a changelog or a draft in Markdown.

Draft a YouTube post for the video I uploaded to my media library today: title “How we cut our build time in half”, unlisted, not made for kids. Do not schedule it yet.
What is scheduled on my YouTube channel this month, and are any of the videos missing a thumbnail?
Write a YouTube description for our launch video from docs/launch.md, keep the tags under 500 characters, and save it as a draft for Friday at 17:00.

What Codex can do on your YouTube channel

Check the rules first. Before writing, it reads your YouTube channel's length limit (5,000 characters) and required settings.
Draft, schedule or post. It creates a draft, a scheduled post or an immediate post, and runs the same checks as the app.
Use your media. It attaches files from your media library or adds one from a public link.
Review and fix. It lists what is scheduled, changes the YouTube settings of a post that has not gone out, and deletes posts you no longer want.

A YouTube post is a video, a title and a visibility choice. Unlike a text network, nothing about it can be left until the last minute, so PostDelegate keeps the video file, the title, the description and the thumbnail together with the planned post. Everything is ready before the scheduled time arrives.

YouTube settings Codex can fill in

Setting	Notes
Title	Required. 2 to 100 characters.
Visibility	Required. Public, Private or Unlisted.
Made for kids	Optional. Yes or No.
Thumbnail	Optional image. Custom thumbnails need a phone-verified YouTube channel, and YouTube may ignore them on videos it treats as Shorts. The video is still published if YouTube rejects a thumbnail.
Tags	Optional. All tags together can use at most 500 characters; a tag with a space counts two extra characters.

Before you start

Signing in to PostDelegate with Google does not by itself connect a YouTube channel.
Every YouTube post needs a video file. Uploads follow YouTube's own daily quota.

The YouTube channel guide has every field, and MCP tools lists exactly what an assistant can and cannot do.

Questions

Will Codex publish to YouTube without asking me?

Not unless you ask it to. Ask for a draft and the post waits on your calendar until you schedule it, and your workspace's approvals apply as usual. Tools that change data are marked as such, so Codex can ask you before it schedules or deletes anything.

Do I need an API key to connect Codex?

No. Codex signs in with your PostDelegate account through your browser. An API key is only for clients that cannot sign in, as described in MCP clients.

Does it cost extra to use Codex with PostDelegate?

No. The MCP server is on every plan, and Codex runs on your own Codex account, so PostDelegate never charges for AI. Every plan starts with a 7-day free trial with no card.

Can Codex attach images or video to a YouTube post?

It can use files already in your media library, or add one from a public link. It cannot fetch files from your computer, so upload those in the app first. See MCP tools.

Can I schedule a YouTube video as private or unlisted?

Yes. Visibility is a required setting on every YouTube post, and you can choose Public, Private or Unlisted for each video.

Can I add a custom thumbnail to a scheduled YouTube video?

Yes, add an optional thumbnail image to the post. Custom thumbnails need a phone-verified YouTube channel, and YouTube may ignore them on videos it treats as Shorts. If YouTube rejects the thumbnail, the video is still published.

YouTube from other assistants

Other networks from Codex

Prefer to plan YouTube posts yourself? See the YouTube scheduler.