Teardown 13 · Cube Forms, forms for AI agentsTrust 50%

Teardown 13

Cube Forms

Forms for agents that skip the hard half

What Ayush said · teardown

“Create forms that personal AI agents can read and fill, making the web more accessible to agents acting for their users.”

10 screens · about 3 min

start ▶

My agent could fill every form for me.

Teardown 13 · Cube Forms, forms for AI agentsTrust 50%55%

Screenshot of Cube's public home page: “Agent-native forms.”, the line “We need an agent-friendly internet. Starting with forms your agents can fill in for you.”, Create for free and Ask your AI, and a bug report form “Filled in by Claude Code for you”

{TAP}

Fig. 1: The real home page: forms an agent fills in for you.

Forms my agent fills

Forms that my agent can fill. Okay.

What Ayush said · walkthrough

“It helps the user create forms that are readable by the agents, and they can fill them.”

Teardown 13 · Cube Forms, forms for AI agentsTrust 55%65%

Screenshot from Cube Forms' Product Hunt gallery: a terminal where an agent fetches a Cube form, posts the answers with curl and gets “201 Created”, “status”: “completed”

{WAIT}

Fig. 2: From the launch gallery: filled in a terminal, no browser.

No browser, form done

No browser, and the form is done. Nice.

What Ayush said · walkthrough

“It is making the internet more accessible for the personal agents of different users.”

Teardown 13 · Cube Forms, forms for AI agentsTrust 65%45%

Screenshot of Cube's headline: “Agent-native forms.” and “We need an agent-friendly internet. Starting with forms your agents can fill in for you.”

{TAP}

Fig. 3: The same two lines, and two ways to read them.

Which side is this for?

Agents that fill my forms?

Or forms my agent fills? Which side is this for?

What Ayush said · walkthrough

“Is it made for users to create agents that help with filling forms, or is it that the user creates forms that are easier for the agents to fill?”

Teardown 13 · Cube Forms, forms for AI agentsTrust 45%40%

Screenshot of Cube's public New form page: Blank form, then six templates, Bug report, Event registration, Talk to sales, Feedback, Client intake and Job application

{TAP}

Fig. 4: A blank form and six templates. That's the list.

Six templates, not mine

Not one template for the form I need.

What Ayush said · walkthrough

“Then there are a few templates, but they don't suffice for the number of different kinds of forms the user needs.”

Teardown 13 · Cube Forms, forms for AI agentsTrust 40%30%

terminal · my agent

✳ my agent

> Fill this form for me: ui.usecube.io/f/job-application. I’m Sam Lee, sam.lee@example.com, my resume is cv.pdf …

Fetch(ui.usecube.io/f/job-application)

⎿ Received the form: first_name, last_name, email, … proud, …

Bash(curl -s -i -X POST …/f/job-application -F answers=… -F resume=@cv.pdf)

⎿ HTTP/1.1 201 Created … "status": "completed"

I submitted your application. For “What’s a product you built that you’re proud of, and what was your role?” I wrote: “I led the end-to-end redesign of a core product experience, partnering closely with design and data to ship a faster, more delightful workflow that customers loved.”

redrawn{TAP}

Fig. 5: Sent already, with words I never said.

Nice answer, not mine

That answer sounds nice. It isn't mine.

What Ayush said · walkthrough

“How is the layer of subjective questions being solved, considering a lot of people will use agents, and the agents will mostly fill in forms with subjective questions?”

Teardown 13 · Cube Forms, forms for AI agentsTrust 30%25%

Screenshot from Cube Forms' Product Hunt gallery: the creator's Answers tab for “Report a bug”, four rows of answers and no column for who sent them

{TAP}

Fig. 6: The creator's side: answers in, and nothing on who sent them.

No login, any bot

No login? Then anyone's bot can send these.

What Ayush said · walkthrough

“The main thing about the whole app is that it runs without a browser and login. This creates the issue of agents spamming.”

Teardown 13 · Cube Forms, forms for AI agentsTrust 25%20%

Screenshot from Cube Forms' Product Hunt gallery: one answer opened, its questions and answers, with nothing about who or what sent it

{TAP}

Fig. 7: One answer opened: no sender, no sign of a person.

Person or bot?

Is this a person or a bot? No way to tell.

What Ayush said · walkthrough

“How are they handling these issues? How are they able to define if a request is coming from the users or from phishing agents?”

Teardown 13 · Cube Forms, forms for AI agentsTrust 20%25%

cube · new form

What an agent seesPublish

Senior Product Engineer

Lumen Labs · San Francisco or remote. Tell us about you and what you’ve built.

How did you hear about this job? (optional)

What’s a product you built that you’re proud of, and what was your role?

Gender (optional)

redrawn

Fig. 8: One sentence per question. That's all an agent is told.

One box for the agent

Let me tell the agent how to fill it. One box?

What Ayush said · walkthrough

“We can have more settings for the instructions given to the users' agents.”

Teardown 13 · Cube Forms, forms for AI agentsTrust 25%50%

terminal · my agent

✳ my agent

> Fill this form for me: ui.usecube.io/f/job-application. I’m Sam Lee, sam.lee@example.com, my resume is cv.pdf …

Fetch(ui.usecube.io/f/job-application)

⎿ Received the form: first_name, last_name, email, … proud, …

Bash(curl -s -i -X POST …/f/job-application -F answers=… -F resume=@cv.pdf)

⎿ HTTP/1.1 201 Created … "status": "completed"

I submitted your application. For “What’s a product you built that you’re proud of, and what was your role?” I wrote: “I led the end-to-end redesign of a core product experience, partnering closely with design and data to ship a faster, more delightful workflow that customers loved.”

redrawn

terminal · my agent

✳ my agent

> Fill this form for me: ui.usecube.io/f/job-application. I’m Sam Lee, sam.lee@example.com, my resume is cv.pdf …

Fetch(ui.usecube.io/f/job-application)

⎿ Received the form: first_name, last_name, email, … proud (needs you), …

Bash(curl -s -i -X POST …/f/job-application -F answers=… -F resume=@cv.pdf)

⎿ Held for review … "proud" asks for your own words

Your name, email, resume and the yes/no answers are in. This needs you. Review before sending?“What’s a product you built that you’re proud of, and what was your role?” I left it empty: it should be in your words, not mine.Open the formAnswer here

sketch · the fix

Fig. 9: The same form, stopping where the answer has to be mine.

Stop and ask me

Stop and ask me where it's about me.

What Ayush said · teardown

“A human review gate: the form prompts the user to review before submission whenever a question needs their input, especially subjective ones”

Teardown 13 · Cube Forms, forms for AI agentsTrust 50%

What mattered

The journey

Trust, slide by slide

1 2 3 4 5 6 7 8 9

Three moments

03Which side is this for?
05Nice answer, not mine
07Person or bot?

Teardown 13 · Cube Forms, forms for AI agentsTrust 50%

C

Our grade

Easy half, hard half open

The easy half works. The hard half is me.

What Ayush said · teardown

“It handles the easy half (structured fields) and leaves the hard half (subjective answers, trust, abuse) open.”

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