The AI Agent That Assumes: Why Automation Needs to Ask, Not Guess
AI agents are good at filling in gaps quietly, which is exactly the problem. Here's why business automation needs to be built to ask rather than assume, with real examples.
Software brief generator
Turn a rough idea into a proper software brief.
Describe what you want in a sentence or paste a messy spec. Answer a few mostly point-and-click questions, and get a clear, development-ready software brief you can share and build from. No sign-up, no jargon.
01What it is
What is a software brief, and why does it matter?
A software brief is a clear, structured description of what a piece of software needs to do. Not the code, and not the design, but the intent: who uses it, what it has to do for them, the rules it must follow and where the edges of the project are.
Most software problems do not start in the build. They start with a vague idea that different people picture differently. One person imagines a simple booking form, another a full CRM. Without a shared, written understanding you get scope creep, surprise costs, and a finished product that does not quite fit. A good brief is the cheapest insurance you can buy against all of that.
The trouble is that writing a good brief is genuinely hard, especially if software is not your day job. You do not know what you do not know. This tool does that thinking for you: it reads your idea, works out what still needs deciding, and asks about the things that actually change the shape of the build.
Brief, requirements document or scope of work?
You will see the same idea called a software brief, a requirements document, a software requirements specification (SRS) or a scope of work. The label matters far less than whether it is clear. Whatever you call it, the job is the same: capture what the software has to do so everyone shares one understanding before anycustom software gets built. This generator gives you that in minutes, in plain language a client and a developer can both follow, rather than a heavy formal template most people never finish.
02What you get
A brief a developer could actually build from
When you are ready, the tool writes a professional brief that only includes the sections relevant to your project. Depending on what you are building, that can cover:
- Project overview and objectives
- Users and roles
- Functional requirements and features
- User journeys and workflows
- Business rules
- Data and integrations
- Authentication and permissions
- Payments and notifications, where relevant
- Edge cases and error handling
- Assumptions and out of scope
- Outstanding questions
- Acceptance criteria
Where something is still undecided, it is listed as an outstanding question rather than invented. Honest beats impressive.
03How it works
Three steps, mostly clicking
- 01
Describe your idea
Type a sentence or paste a rough spec. Anything from "a booking system for dog groomers" to several pages of notes works.
- 02
Answer a few guided questions
The tool reads what you gave it and asks the highest-value questions, one at a time. Most are answered by clicking an option rather than typing.
- 03
Generate your brief
When enough is understood, generate a clear, professional software brief you can read, share and build from. Unresolved points are flagged, not invented.
Who it is for
Founders and business owners scoping a first build, operations managersreplacing a spreadsheet or a manual process, and agencies or teams who want to pin down requirements before theyask for a quote. If you are still deciding whether to build at all, thebuild vs buy calculator is a good place to start first. If you can describe the problem, the tool can help you describe the solution.
04Related tools
Two free tools to help you decide
Not sure a custom build is the right call at all? Thebuild vs buy calculatorweighs off-the-shelf software against a bespoke build for your situation. And if the thing you want to fix is a repetitive manual process, themanual admin cost calculatorworks out what it is costing you in staff time each year, and what automation could recover.
Insights
Related reading
You Inherited a System Nobody Can Explain. Now What?
When you inherit software with no documentation and no developer to ask, the temptation is to rewrite it fast. Here's a safer way to work out what it actually does first.
Your AI Coding Assistant Doesn't Remember Last Week's Decisions
AI coding agents don't carry memory of past decisions between sessions the way a human developer does. That gap shows up as inconsistency in your codebase, and it matters more than most people realise.
05FAQs
Common questions
What is a software brief?
A software brief is a clear, structured description of what a piece of software needs to do: the goals, the users, the features, the rules and the boundaries. A good one gives you and whoever builds it a shared, unambiguous understanding of the work, so there are fewer surprises, less rework and a more accurate quote.
Do I need to know what I want before I start?
No. That is the point of the tool. You can start from a single sentence. It works out what is already known, what is implied and what is missing, then asks about the decisions that actually matter. It is designed to draw the requirements out of you, including things a non-technical person would not think to specify.
Do I have to type a lot?
As little as possible. Most questions are answered by picking from a few sensible options, with a recommended choice where there is a conventional default. You can type a custom answer when you want to, and skip or flag anything you are not sure about.
Is it free?
You can run the whole interview and see a preview of your brief for nothing. Unlocking the full brief and the branded PDF is a one-off payment, with no account and no subscription. If you would like Thackr to build what the brief describes, get in touch separately.
How accurate is the brief?
It is only as good as the answers you give, and it is written to reflect exactly that. Where something is genuinely undecided it is listed under outstanding questions rather than guessed at. It is a strong, developer-readable starting point, not a fixed contract, and a real project still benefits from a proper conversation.
Is this a software requirements document, an SRS or a spec?
Those terms overlap. A software brief, a requirements document, a software requirements specification (SRS) and a scope of work are all attempts to write down what a system needs to do before it is built. This tool produces a plain-English brief covering the same ground: objectives, users, features, rules, data and boundaries. It is readable by a non-technical owner and detailed enough for a developer to quote and build from, without the heavy formal template most people never finish.
Can I use it for a mobile app or a website, not just a system?
Yes. It works for a web app, a mobile app, an internal business system, a customer portal or a website with real functionality behind it. The interview adapts to what you are describing and only includes the sections that are relevant, so an app brief and a booking-system brief come out looking quite different.
How much will it cost to build what the brief describes?
The brief itself does not put a price on the work, because an honest figure needs a proper look at the detail. As a rough guide, bespoke projects usually run from a few thousand to tens of thousands of pounds depending on scope. Once you have a brief, get in touch and I will turn it into a delivery plan with timescales and a realistic budget.
What happens to what I type?
Your input is sent to Thackr's own systems to run the interview and produce the brief. It is not sold or shared. There is no account and no email required to use it.
Can Thackr build the software for me?
Yes. Thackr is Josh Thackeray, an independent UK software developer who builds bespoke web apps, internal systems and automation. Once you have a brief, get in touch and we can turn it into a delivery plan with timescales and a realistic budget.
Got the brief? Let's build it.
Once you've generated a brief, the next step is a straight conversation about what it would take to build, from the person who'd actually do the work.
Or email me at josh@thackr.co.uk