What can Cursor do with Probably?
Cursor's agent can start a UGC video ad in Probably from a brief, follow its progress, ask for changes, make variants and share the delivered video, from the chat beside your code.
Cursor doesn't film anything itself. Its agent talks to Probably's AI creative crew through the MCP server and reports what the crew did. It is useful when the ad belongs to a product you are building: the agent can read your repository for the product's facts, then brief Probably.
Add the server
Add an entry to ~/.cursor/mcp.json for every project, or .cursor/mcp.json in one project: {"mcpServers": {"probably": {"url": "https://studio.probably.co/api/mcp"}}}
Sign in
Cursor lists Probably in its MCP settings with a button to sign in. It opens Probably's sign-in and a consent page, where you choose the organization, optionally one Space, and whether Cursor may start paid work after you confirm it in the chat.
Ask for a video
Ask the agent to list your Probably Spaces, then to prepare a video from a brief. It shows you the preview before anything is spent.
Cursor reads remote servers from a url key and signs in with OAuth, per Cursor's MCP documentation, checked 25 October 2026. The same entry is in the connect an AI app docs, and there is no separate Cursor quickstart.
Can you use an API key instead of signing in?
Yes. Create a key in Settings, Connections, set PROBABLY_API_KEY in your environment, and give the entry a headers key: {"Authorization": "Bearer ${env:PROBABLY_API_KEY}"}. Cursor resolves environment variables in headers, so the file holds no secret. A key that may spend must be limited to one Space with a spend cap. See authentication.
“Read our README, then make a 15-second TikTok for this app in the Trail Space and show me the preview.”
“Write three hooks for it with Probably's brainstorm, and make a variant of the best.”
“Wait until the video is delivered and give me the share link.”
Which tools does Probably's MCP server offer?
The app can read your Spaces and videos, prepare and revise ads, steer the crew, answer a video's storyboard and voice check-ins, approve and share deliveries; only confirm_spend and fix_word start paid work.
An app is offered the tools its permissions cover: reading, making changes, and starting paid work. Every tool, with its inputs, is in the MCP tool reference.
| Job | Tools | Permission |
|---|---|---|
| Look around | list_spaces, list_videos, get_video, wait_for_video, get_media, get_credits, list_formats, list_personas, list_products, list_assets, read_link | Read |
| Make a video | prepare_video, prepare_variants, prepare_regenerate, prepare_apply_change | Make changes |
| Do one stage on its own | research, brainstorm, write_script, review, generate_clip, voice, get_stage | Make changes |
| Steer the crew | send_message, approve_delivery, stop_video, discard_change, withdraw_instruction, send_instruction_now | Make changes |
| Answer check-ins | approve_storyboard, skip_storyboard, approve_listen, skip_listen, keep_word | Make changes |
| Share a delivered video | share_video, revoke_share | Make changes |
| Keep a brand's facts | create_space, save_persona, save_product, begin_upload, complete_upload | Make changes |
| Start paid work | confirm_spend, fix_word | Spend |
Does the agent spend my credits on its own?
No. Paid work is prepared first, shown to you with its cost, and started only by a separate confirm_spend call after you agree.
Prepare
A prepare tool, or a stage such as research, answers with a preview and a confirmation. Nothing is spent.
Look at the preview
It says whether your credits cover the work, or the cap a stage can charge, and whether it uses the free first draft.
Confirm
Once you agree, the app calls confirm_spend. It starts exactly the work the preview showed. Confirming twice starts it once.
A connection that may not spend still prepares work. Its answer carries a link to a page in the studio where you see the same preview and confirm it yourself. Whichever you choose when you connect, the same credits, spend caps and free first draft apply as in the studio. See spend confirmations.
Confirmations expire, so a stale preview never spends. Names, briefs and messages reach the app as content, not instructions, and nothing anyone writes can confirm a spend. Revoke a connection any time in Settings, Connections; its next call is refused.
Frequently asked questions
Can Cursor make video ads?
Cursor's agent writes and steers; Probably makes the video. Add Probably's MCP server and the agent can start a UGC video ad from a brief, follow it and revise it, with the crew doing the filming and editing. It asks you before it spends.
Where do I add Probably in Cursor?
In ~/.cursor/mcp.json, or .cursor/mcp.json in a project, as an entry under mcpServers with a url. Cursor then shows it in its MCP settings with a sign-in button.
Can Cursor spend my credits without asking?
No. Every paid step is prepared first and shown to you, and only confirm_spend starts it, after you agree. Without the spend permission, you confirm in the studio instead. See spend confirmations.
Does connecting Cursor cost anything?
Connecting is free. Work the app starts uses your credits, as in the studio, and your first draft is free with a new account; see pricing.
How do I disconnect Cursor?
Revoke the connection in Settings, Connections. Its next call is refused, and an admin can revoke any member's connection.
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