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Open with the business problem, not a feature list. Who will use this, how many times a day, and what does the process look like without it? A vendor who understands the goal will suggest an alternative that costs less; a team that receives only a list of screens can only price exactly what you asked for.

Set out the scope as concrete flows: what the user does and what the system does in response. Equally important, state explicitly what you are not building. An explicit list of exclusions saves more friction during acceptance than the rest of the brief combined. Indicate as well which items are decided and which are still under discussion — estimators price uncertainty, and concealing the open questions only hurts you.

Set out your constraints. These include the platforms and services involved, the data you already hold and its condition, regulatory obligations, expected load, hire dedicated aiohttp developer target platforms and infrastructure that is already decided. If a deadline is real, say why: social media marketing services an experienced team can often rearrange the plan to protect it, but not if the date is a secret.

Say what done means for the important items. Testable acceptance criteria do not need special syntax: a short list describing the expected behaviour is enough. That one addition reduces acceptance testing considerably and removes the usual argument at handover.

Finally, say what you expect back. Require a breakdown by feature or module, a written list of assumptions, the risks the team sees and a low number and a high number. Treat a wide range as a signal about the brief: it normally identifies where your description is thin. At that point rewrite that part and request a revised number — the revised figure is much more reliable.