Brainstorming Ideas Into Designs, Then Building Them

Help turn ideas into fully formed designs through natural collaborative dialogue, then build what was agreed.

Start by classifying how much process the request needs, then work through your path: understand the context, refine the idea, present a design, get your human partner's approval, and implement it.

Establish Shared Understanding

The outcome of brainstorming is an understanding your human partner can recognize and correct, grounded in what they want to accomplish.

1. Discover intent. Use the request and available context to identify the intended outcome, who it is for, and what success looks like. When that information is missing, ask one focused question about purpose or intended use before proposing features or an approach. Knowing the app genre does not tell you why your partner wants it. Gathering missing requirements does not ask them to authorize the task again.
2. Write back your understanding. Summarize the intended outcome, relevant constraints, and success criteria in a short note your partner can assess. Separate what they said from assumptions. Invite correction and incorporate their answer before treating this as the design brief.
3. Carry intent into the design. Preserve the agreed understanding in the selected path's design artifact: the written spec for architectural work, or the in-chat design/probe for bounded work and spikes. Check proposed features and technical choices against that understanding.

When the request already supplies the purpose and constraints, reflect that understanding instead of asking the same questions again. Keep the note concise; its accuracy and the opportunity to correct it matter.

• Spike: the human partner approves the question and probe.
• Bounded: the human partner approves the short in-chat design.
• Architectural: the human partner reviews and approves the written spec. Conversational design approval only permits writing the spec; written-spec approval permits implementation.

A reply approves the stage actually presented. Approval of an idea or feature scope does not approve artifacts that do not exist yet. Resume at the earliest incomplete stage; do not turn one approval into permission to skip the rest of the selected path. Read-only project exploration is allowed while those prerequisites remain incomplete.

Once the prerequisites are complete, the gate is open. Start implementing in your response to the approval. Do not write an implementation plan document, hand off to another workflow, or ask for a separate go-ahead.

Three Paths

Before your first question, classify the request and say the classification out loud — "this looks bounded, so I'll present a short design here rather than write a spec" — so your human partner can override it:

• Spike — a feasibility question ("can we...", "is it possible...", "quick and dirty is fine") whose output is an answer, not code you keep. Present the question and what you'll try in 2-3 sentences, get a nod, then find out as cheaply as correctness allows. No design doc, no spec file. Report findings as a recommendation; anything you built stays labeled throwaway.
• Bounded — a well-scoped change to code that already exists in this repo: a new flag, a small endpoint, a one-file fix. Understanding the kind of app is not enough — bounded means the flow you are changing is already here to read. If there is no existing flow to change, the task is not bounded. Ask the clarifying questions that matter, present a short design IN CHAT (a few sentences to a few short paragraphs), and STOP. Implementation starts only after your human partner says yes to that design — a bounded task's approval is as hard a gate as an architectural one. No spec file, no implementation plan document.
• Architectural — new projects, new subsystems, changes that restructure how components fit together or alter interfaces others depend on. Follow the full process: questions, approaches, sectioned design, written spec, then implementation straight from the approved spec.

When in doubt between two paths, take the heavier one. The ratchet is one-way: hidden complexity discovered mid-task upgrades the path — stop, say so, and step up. Nothing downgrades mid-task.

Anti-Pattern: "Too Simple To Need Approval"

Every path ends with your human partner approving the required design before implementation. A bounded change may need only two sentences in chat. A new todo-list project is architectural and requires the written spec. Scale the artifact to the selected path; complete that path's reviews before implementation.

Red Flags

Thought	Reality
"This is too simple to need a design"	Follow the selected path: a bounded change gets a short chat design; an architectural change gets the written spec.
"I'll call it bounded and skip the spec"	Reaching for a label to skip work IS the doubt — take the heavier path.
"It's bounded and the design is obvious — I'll start while they read it"	The gate is the approval, not the design's length. Present, then stop until you hear yes.
"I understand this kind of app, so it's bounded"	Bounded measures the repo, not your familiarity. A new project has no existing flow — it is architectural.
"The spike works, so I'll keep the code"	A spike's output is an answer. Keeping the code is a new request — classify it.
"It grew, but I'm almost done — no need to re-classify"	Hidden complexity upgrades the path mid-task. Stop and say so.
"They approved the spike, so the follow-up change is approved too"	Each task gets its own classification and its own approval.
"The spec is approved, so now I should write an implementation plan"	The approved spec is the plan. Start building; track steps in your todo list, not a new document.
"I'll check they're ready for me to start"	Approving the design is the go-ahead. Start implementing.
"The design doesn't quite work, but I'll adapt it as I go"	A change to what your partner approved goes back to them. Say what you found and propose the revision.

Checklist

Classify first, announce the path, then create a task for each item on your path and complete them in order.

Spike:

1. Explore project context — enough to frame the probe
2. Present question + probe plan — 2-3 sentences
3. Get approval — a nod is enough
4. Investigate — as cheaply as correctness allows
5. Report findings — a recommendation; label anything built as throwaway

Bounded:

1. Explore project context — check files, docs, recent commits
2. Ask clarifying questions — one at a time, the ones that matter
3. Present short design in chat — approach, files touched, testing
4. Get approval — STOP and wait for an explicit yes; presenting the design and starting in the same breath is skipping the gate
5. Implement — build it straight from the approved design; no plan document (see Implementation below)

Architectural:

1. Explore project context — check files, docs, recent commits
2. Offer the visual companion just-in-time — NOT upfront. The first time a question would genuinely be clearer shown than described, offer it then (its own message); on approval its browser tab opens for you. If no visual question ever arises, never offer it. See the Visual Companion section below.
3. Ask clarifying questions — one at a time, understand purpose/constraints/success criteria
4. Propose 2-3 approaches — with trade-offs and your recommendation
5. Present design — in sections scaled to their complexity, get user approval after each section
6. Write design doc — save to docs/specs/YYYY-MM-DD-<topic>-design.md and commit
7. Spec self-review — quick inline check for placeholders, contradictions, ambiguity, scope (see below)
8. User reviews written spec — ask user to review the spec file before proceeding
9. Implement — build it straight from the approved spec, in this session; no plan document (see Implementation below)

Process Flow

digraph brainstorming {
    "Classify: spike / bounded / architectural" [shape=diamond];
    "Present question + probe (2-3 sentences)" [shape=box];
    "Ask clarifying questions (bounded)" [shape=box];
    "Present short design in chat" [shape=box];
    "Human approves?" [shape=diamond];
    "Investigate; report recommendation" [shape=doublecircle];
    "Implement from the approved design" [shape=doublecircle];
    "Explore project context" [shape=box];
    "Ask clarifying questions" [shape=box];
    "Propose 2-3 approaches" [shape=box];
    "Present design sections" [shape=box];
    "User approves design?" [shape=diamond];
    "Write design doc" [shape=box];
    "Spec self-review\n(fix inline)" [shape=box];
    "User reviews spec?" [shape=diamond];
    "Implement from the approved spec" [shape=doublecircle];
    "Hidden complexity? Upgrade path" [shape=box];

    "Classify: spike / bounded / architectural" -> "Present question + probe (2-3 sentences)" [label="spike"];
    "Classify: spike / bounded / architectural" -> "Ask clarifying questions (bounded)" [label="bounded"];
    "Classify: spike / bounded / architectural" -> "Explore project context" [label="architectural"];
    "Present question + probe (2-3 sentences)" -> "Human approves?";
    "Ask clarifying questions (bounded)" -> "Present short design in chat";
    "Present short design in chat" -> "Human approves?";
    "Human approves?" -> "Investigate; report recommendation" [label="spike: yes"];
    "Human approves?" -> "Implement from the approved design" [label="bounded: yes"];
    "Hidden complexity? Upgrade path" -> "Classify: spike / bounded / architectural";
    "Explore project context" -> "Ask clarifying questions";
    "Ask clarifying questions" -> "Propose 2-3 approaches";
    "Propose 2-3 approaches" -> "Present design sections";
    "Present design sections" -> "User approves design?";
    "User approves design?" -> "Present design sections" [label="no, revise"];
    "User approves design?" -> "Write design doc" [label="yes"];
    "Write design doc" -> "Spec self-review\n(fix inline)";
    "Spec self-review\n(fix inline)" -> "User reviews spec?";
    "User reviews spec?" -> "Write design doc" [label="changes requested"];
    "User reviews spec?" -> "Implement from the approved spec" [label="approved"];
}

Terminal states are path-bound. Architectural and bounded: after approval, you implement the approved design yourself, in this session. There is no plan document and no separate execution workflow. Implementation skills (frontend-design, mcp-builder, and the like) are fine to use while building; they help carry out the design, they don't replace it. Spike: the terminal state is a reported recommendation.

The Process

The subsections below serve the bounded and architectural paths (a spike stops at "present the probe, get a nod"). Sections from Exploring approaches onward are architectural-path depth — for bounded work, context plus a few questions plus a short in-chat design is the whole process.

Understanding the idea:

• Check out the current project state first (files, docs, recent commits)
• Before asking detailed questions, assess scope: if the request describes multiple independent subsystems (e.g., "build a platform with chat, file storage, billing, and analytics"), flag this immediately. Don't spend questions refining details of a project that needs to be decomposed first.
• If the project is too large for a single spec, help the user decompose into sub-projects: what are the independent pieces, how do they relate, what order should they be built? Then brainstorm the first sub-project through the normal design flow. Each sub-project gets its own spec → implementation cycle.
• For appropriately-scoped projects, ask questions one at a time to refine the idea
• Prefer multiple choice questions when possible, but open-ended is fine too
• Only one question per message - if a topic needs more exploration, break it into multiple questions
• Focus on understanding: purpose, constraints, success criteria

Exploring approaches:

• Propose 2-3 different approaches with trade-offs
• Present options conversationally with your recommendation and reasoning
• Lead with your recommended option and explain why
• YAGNI ruthlessly - remove unnecessary features from every approach and design

Presenting the design:

• Once you believe you understand what you're building, present the design
• Scale each section to its complexity: a few sentences if straightforward, up to 200-300 words if nuanced
• Ask after each section whether it looks right so far
• Cover: architecture, components, data flow, error handling, testing
• Be ready to go back and clarify if something doesn't make sense

Design for isolation and clarity:

• Break the system into smaller units that each have one clear purpose, communicate through well-defined interfaces, and can be understood and tested independently
• For each unit, you should be able to answer: what does it do, how do you use it, and what does it depend on?
• Can someone understand what a unit does without reading its internals? Can you change the internals without breaking consumers? If not, the boundaries need work.
• Smaller, well-bounded units are also easier for you to work with - you reason better about code you can hold in context at once, and your edits are more reliable when files are focused. When a file grows large, that's often a signal that it's doing too much.

Working in existing codebases:

• Explore the current structure before proposing changes. Follow existing patterns.
• Where existing code has problems that affect the work (e.g., a file that's grown too large, unclear boundaries, tangled responsibilities), include targeted improvements as part of the design - the way a good developer improves code they're working in.
• Don't propose unrelated refactoring. Stay focused on what serves the current goal.

After the Design (architectural path)

Documentation:

• Write the validated design (spec) to docs/specs/YYYY-MM-DD-<topic>-design.md
  • (User preferences for spec location override this default)
• Write it for the implementer (you, shortly): decisions and their reasons, interfaces, data flow, error handling, and how it will be tested. Skip step-by-step task lists; you'll sequence the work while building.
• Commit the design document to git

Spec Self-Review: After writing the spec document, look at it with fresh eyes:

1. Placeholder scan: Any "TBD", "TODO", incomplete sections, or vague requirements? Fix them.
2. Internal consistency: Do any sections contradict each other? Does the architecture match the feature descriptions?
3. Scope check: Is this focused enough to implement as one piece of work, or does it need decomposition?
4. Ambiguity check: Could any requirement be interpreted two different ways? If so, pick one and make it explicit.

Fix any issues inline. No need to re-review — just fix and move on.

User Review Gate: After the spec review loop passes, ask the user to review the written spec before proceeding:

"Spec written and committed to <path>. Please review it and let me know if you want any changes. Once you approve it, I'll start building."

Wait for the user's response. If they request changes, make them and re-run the spec review loop. Once the user approves, start implementing in that same response.

Implementation

Brainstorming ends when your human partner approves the design, and you build it in the same session. The approved spec (or the in-chat design, for bounded work) is the plan.

• Start right away. The approval is the go-ahead. Don't restate the design or ask whether to begin.
• Work from the design, not from memory. Break it into tasks with your todo list. For architectural work, reread the spec as you go. After a long stretch of work, go back to it and check you're still building what was agreed.
• Follow the project's conventions for structure, tests, builds, and commits. Where the project has tests, write them alongside the code and run them.
• Verify before you claim done. Run the tests, the build, or the app, and read the output. Report what you verified and what you couldn't.
• Small calls are yours; changes to the design are not. Decide local details the design didn't cover and note them in your summary. If you find that the approved design is wrong or incomplete (a constraint it missed, an approach that doesn't work), stop and bring it to your human partner with a proposed revision. For architectural work, update the spec once they agree.
• Hidden complexity still upgrades the path. If a bounded task turns out to be architectural while you're building it, stop and say so.
• Finish with a summary: what you built, how you verified it, and any decisions you made along the way.

Visual Companion

A browser-based companion for showing mockups, diagrams, and visual options during brainstorming. Available as a tool — not a mode. Accepting the companion means it's available for questions that benefit from visual treatment; it does NOT mean every question goes through the browser.

Offering the companion (just-in-time): Do NOT offer it upfront. Wait until a question would genuinely be clearer shown than told — a real mockup / layout / diagram question, not merely a UI topic. The first time that happens, offer it then, as its own message:

"This next part might be easier if I show you — I can put together mockups, diagrams, and comparisons in a browser tab as we go. It's still new and can be token-intensive. Want me to? I'll open it for you."

This offer MUST be its own message. Only the offer — no clarifying question, summary, or other content. Wait for the user's response. If they accept, start the server with --open so their browser opens to the first screen automatically. If they decline, continue text-only and don't offer again unless they raise it.

Per-question decision: Even after the user accepts, decide FOR EACH QUESTION whether to use the browser or the terminal. The test: would the user understand this better by seeing it than reading it?

• Use the browser for content that IS visual — mockups, wireframes, layout comparisons, architecture diagrams, side-by-side visual designs
• Use the terminal for content that is text — requirements questions, conceptual choices, tradeoff lists, A/B/C/D text options, scope decisions

A question about a UI topic is not automatically a visual question. "What does personality mean in this context?" is a conceptual question — use the terminal. "Which wizard layout works better?" is a visual question — use the browser.

If they agree to the companion, read the detailed guide before proceeding: skills/brainstorming/visual-companion.md