How to use Codex for social media posts

Before you start

You need a ReelGenie workspace and Codex with an image-generation tool. Copy the ReelGenie setup instruction into Codex, create a token for your workspace on the Agents page when it asks, and ask it to confirm which workspaces it can access. You can make and review a draft before connecting a social account.

This example uses our Doola AU workspace. Doola helps people read food and skincare labels during pregnancy. We already had a saved Favourite called Bold photo hook, cream insight carousel: a photographic cover followed by quieter reading slides.

For your first post, supply a reference image and a short brief: who the post is for, what they should learn, and what your product can actually help them do.

1. Ask for a topic that fits the workspace

The request in our chat was simple: “create another post for doola au and lumo.” Codex read both workspace briefs and recent posts. Doola AU had recently covered food and fish, so it looked for a skincare topic rather than repeating those subjects.

It found a pregnancy-skincare product carousel. People in the comments were asking about particular products and whether a whole brand was suitable. That gave us a more useful topic than another shopping list: check the product you own, rather than treating a brand recommendation as an answer for every formula.

Codex proposed this cover:

Pregnancy-safe skincare? Check the product, not just the brand.

We approved the direction before generating the full post. For your own workspace, a prompt like this gives you something concrete to choose:

Read [workspace]’s brief and recent posts. Find a relevant carousel or audience question we have not covered. Show me the source, a proposed cover hook and what each following slide would teach. Wait for me to choose before generating images.

2. Keep the topic separate from the visual reference

The skincare carousel supplied the topic. Our existing Favourite supplied the visual style. We did not copy the source’s product list or save it as a new visual reference.

For the cover, Codex made an original image of a pregnant person reading a bottle at a bathroom counter. The headline uses white text with pink emphasis on “the product.” The following slides use cream backgrounds and more room for explanation.

Codex generated a cover and one interior slide first. We checked them against the Favourite before completing the other three. That is a useful stopping point: if the style or text is wrong, correct two slides rather than a whole batch.

3. Give each slide a job

Our final sequence had five slides:

1. Cover: check the product, not just the brand.
2. Start with the ingredient list: use the exact bottle as the starting point.
3. Retinol counts as a retinoid: explain an ingredient distinction readers may miss.
4. An acid is not one single rule: avoid replacing one broad claim with another.
5. Check one bottle before buying another: show where Doola Scan helps and when to ask a clinician or pharmacist.

Because this topic concerns pregnancy, Codex checked the wording against the American Academy of Dermatology’s pregnancy skin-care guidance and acne-treatment guidance. We did not turn a source post’s product recommendations into medical clearance.

For another topic, the same review question works: after the cover, does every slide explain something the reader can use?

4. Open the Post beside your Codex chat

Codex saved five ordered images and the caption to a private ReelGenie Post, then returned its review link. Open that link in Codex’s browser panel. You can inspect the image, discuss a change and keep the Post in view in the same window.

Save these five slides and the caption as a review draft in [workspace]. Open its ReelGenie post-details page in the browser beside this chat. Do not approve or publish it yet.

Click through all the slides, then read the full caption. Check the workspace name and make sure the ending describes something your product really does. If an image needs a correction, ask Codex to replace it while the Post is still a draft, then refresh and check the saved version.

Codex checked the workspace, image order and caption after saving our post. The screenshot at the top shows this same setup after publication; it is not a screenshot of the earlier review status.

5. Approve the accounts and check each result

After we reviewed both Doola AU and Lumo, the user said, “approve and post them.” Codex explained the destinations first: Doola AU would publish to Instagram @pregnancy_doola and send a draft to TikTok’s Doola inbox. Lumo would send to Damon’s TikTok inbox.

The Doola AU carousel published on Instagram. Both TikTok deliveries returned inbox drafts; we still needed to open TikTok and finish publishing there.

For your own post, be specific:

Approve this version for [account]. Publish now, or schedule it for [date, time and timezone]. Tell me whether the account supports direct publication or an inbox draft, then show me the result.

The publishing guide walks through those checks and scheduling.

Try it with one post

The useful part of this setup is having the conversation and the saved Post beside each other. You can point to a weak slide, ask for a change and inspect what was actually saved before sending it.

Create a free workspace and connect ReelGenie to Codex. Start with one topic and one reference you like. If you are creating for different brands, see how we kept Doola and Lumo separate.