A voice trainer for the hard conversation: rehearse out loud, it answers with no pause

Here's the idea in one line: an agent you rehearse a hard conversation with out loud — a job interview, asking for a raise, an awkward "no" — and it answers by voice right away, no "recorded, hold on." And at the end it tells you where you wobbled.

A year ago you couldn't build that sparring partner in an evening. A voice bot was a three-part construction site: speech → text → model → speech again. At the seams it lagged and talked over itself, and it never felt like a real conversation.

On July 1 xAI opened a voice-agent builder. You describe the agent in plain words — and in about two minutes it calls and talks on its own, one speech-to-speech model, answering in under a second. Five cents a minute of talk. That's what makes this a weekend build.

Why it's a good project

It's small but real — and, better, you'll actually use it before every important call.

• It's an agent, not a chat. It has a role, a script and a goal — not "let's hang out."
• Feedback. It doesn't just reply — it grades you: where you froze, where you dodged the question.
• Voice, live. You train what text can't train: pauses, "umm," tone under pressure.

What you'll learn

• Describing an agent's behavior in words — that's a prompt, just for voice.
• Setting a script: where to start, how to dig into a weak answer, when to stop.
• Adding a wrap-up — a simple 2–3 point debrief at the end.

A ready starter prompt

Don't tell the builder "make an interview agent" — it'll guess the role and tone. Give it a role, a script and debrief rules:

See the difference? The strong one isn't "settings" — it's a behavior spec: role, script, what to do with a weak answer, and how to end. That's how the builder turns two paragraphs into a live interviewer.

What the result looks like

You open the app, the agent "calls." It asks "tell me about yourself," listens, catches the fuzzy part: "okay, which project exactly?" You talk your way out of it — like a real interview. After five questions it sums up: "Confident on teamwork. Dodged the deadlines question. Tip: keep one concrete example per answer."

Five minutes, five cents — and you've already heard your weakest answer before a real person did.

The weekend plan

• Saturday. Describe the agent in words (use the prompt above), build the first call, run one interview start to finish.
• Sunday. Tune the script to your situation — swap the role for "a manager you're asking for a raise" or "a landlord you're calling about a listing." Add call recording so you can replay it. Show a friend — let them run their own scary call.

One agent, one script — and tomorrow you build a second one for a different conversation.

Source: Grok Voice Agent Builder: launch breakdown (eesel AI)