Doubao Prompt Builder

Persona and tone are what make a Doubao chat feel right

Doubao (豆包) is ByteDance's conversational AI assistant, and it shines at the things people actually do in chat all day: natural back-and-forth, role-play and companion characters, creative and everyday writing, and quick office tasks. Because it is conversational first, the quality of a Doubao reply depends far more on how clearly you set up the persona and tone than on any clever one-off phrase. A structured prompt names who the assistant is, fixes how it should sound, states the task, supplies the context, sets the output format, and lists the constraints. This builder keeps that structure for you: fill the fields, and it joins them into a clean prompt with a leading "你是…" persona line followed by clearly headed sections, each prefixed with a Markdown-style heading the model can read at a glance, ready to paste into the Doubao chat box. The result is the kind of prompt a careful writer would craft by hand, only assembled in seconds.

For a conversational model, the single highest-leverage line is the persona. "你是一位温柔耐心的英语口语陪练" steers Doubao's voice, attitude and viewpoint in one sentence — far more efficiently than a paragraph of adjectives. Right after the persona comes the conversational tone: telling Doubao to sound lively, or professional, or like a close friend keeps every reply consistent instead of swinging between warm and stiff. Then the task and context do the heavy lifting: the task says exactly what to produce, and the context gives the model the facts it needs so it guesses less and stays grounded, even in a casual chat. A good rule of thumb is to make each field concrete and specific: instead of "be friendly", say "speak warmly and casually, like a patient friend who never makes me feel silly for asking".

Constraints and format keep a chatty assistant on track

The fields people skip and regret are tone, output format and constraints. The tone keeps the character on-brand; the format ("reply in dialogue", "answer in bullet points", "under 200 字") turns rambling chat into something you can actually use; and the constraints — "never break character", "say 不确定 when unsure", "do not invent facts" — are what keep even a playful assistant dependable. None of this limits Doubao; it focuses it. For role-play in particular, a single line of "always stay in character" is consistently the cheapest way to stop the model drifting out of its persona halfway through a conversation.

Because the output is structured plain text, the same prompt is portable. It is built for Doubao, but it pastes just as well into DeepSeek, Qwen (通义千问), Kimi, ERNIE, ChatGPT, Claude or Gemini — the structure travels regardless of vendor. Write it in Chinese when you want natural, idiomatic Chinese replies with a strong conversational feel. You can also drop the assembled persona, task and constraints straight into a Doubao custom agent or persona setting, so the same character stays consistent across many turns. And because the whole tool runs locally in your browser, you can iterate freely — tweak the persona, copy again, and test — without anything you type ever leaving your device, being sent to a model, or being stored. Treat the first prompt as a draft: chat with it, notice where the character slips, and tighten the matching field. Two or three rounds of that usually turn a generic assistant into exactly the companion you wanted, and you keep a clean, reusable prompt at the end.