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ChatGPT + Wahlu

Post to Tumblr from ChatGPT with Wahlu

Connect ChatGPT to Wahlu once, then plan, draft and schedule posts for Tumblr blogs you can post to, one blog per connection from a conversation. Every schedule can wait for your approval.

Connect ChatGPTAll ChatGPT options
What ChatGPT can prepare on Tumblr

  • Text post

    Your words, with an optional title and link card.

  • Photo post

    1 to 10 photos, JPEG, PNG or GIF, up to 10 MB each, with alt text.

  • Video post

    One MP4 or MOV video, up to 100 MB.

Ask ChatGPT for Tumblr posts

Example prompts and the steps to expect. These are illustrations, not recorded conversations.

Example prompt

“Write a Tumblr post about Saturday's market with a title and a few tags, and hold it for my review on Friday at 8am.”

Example prompt

“Post these three photos to my Tumblr blog on Tuesday evening with alt text for each, and leave it for me to approve.”

Example prompt

“What's going to my Tumblr blog next week? Find the quiet day and draft a post to fill it.”

What Wahlu does on Tumblr

ChatGPT works through Wahlu's tools, so it can set the Tumblr options Wahlu supports.

Tumblr settings on a draft

Post type
Text, photo or video.
Title and link
An optional heading and a link shown as a card.
Tags
Up to 30 tags, without the #.
Alt text
A description of each photo for screen readers.

Tumblr only allows posts a person makes or schedules, so confirm each post; looping queues and Autopilot don't post to Tumblr. Reblogs aren't available, and Tumblr has no Insights in Wahlu.

The tool calls, in order

  1. 01

    list_targetsFinds the brand's connected Tumblr account and checks it's ready.

  2. 02

    import_media_from_url, upload_media or list_mediaBrings in the image or video, or picks one from your media library.

  3. 03

    create_draftCreates the draft with its caption and tumblr_settings, such as the post type.

  4. 04

    preflight_draftChecks the draft against Tumblr's rules without changing it.

  5. 05

    create_schedulePuts it on the calendar at pending_review, held for your approval.

Tumblr limits to know

Wahlu checks these before a post is scheduled, so the agent finds out early.

Getting images and video to Tumblr

The hosted connection can't open files on your computer. Give the agent a public link to import, pick from your brand's media library, or attach an image the agent can pass on as data. For video, a public link or your media library is usually easiest.

Connect ChatGPT to Wahlu

Set this up once and ChatGPT can work on every network you've connected, not just Tumblr.

  1. 1

    On chatgpt.com, open Settings → Security and login and turn on Developer mode.

  2. 2

    Go to chatgpt.com/plugins and select the + button.

  3. 3

    Name it Wahlu, paste https://mcp.wahlu.com/mcp as the MCP server URL and choose OAuth if asked how to authenticate.

  4. 4

    Create the connection and sign in to Wahlu when asked.

  5. 5

    Start a new conversation and add Wahlu from the tools menu.

Checked against the OpenAI developer docs on 24 September 2026. Menus can change; if a step doesn't match what you see, follow the vendor's current instructions.

Set this up on the ChatGPT website; the desktop apps don't have developer mode. Whether developer mode is available depends on your ChatGPT plan and workspace settings, and a workspace admin may need to allow it.

You stay in control.

Every Wahlu plan includes agent access, through MCP and the API. You choose the workspace, brands and permissions each connection gets, and can disconnect it at any time.

Held until you approve

Agents create schedules at pending_review unless you've told them to publish. A held schedule can't publish until you approve it in Wahlu or ask an agent with Publishing permission to approve it.

Publishing is its own permission

Publishing is separate from Manage your schedule. Leave it unticked and nothing your agent schedules can go out on its own.

Checked before it's scheduled

preflight_draft reports anything that would stop a post, such as media the network won't accept or a caption that's too long, without changing anything.

Some things stay in the app

Use the app for queues, draft media and platform settings, and connecting social accounts. Agents can change the name or caption of an unused draft and approve held schedules with the right permissions.

Keep going

Your next Tumblr post, drafted by ChatGPT.

Connect your Tumblr account in Wahlu, then give ChatGPT a specific brief.

Open WahluAll ChatGPT options