Keel
A revenue workspace where a sales team works alongside five AI agents.
· Built by Claude Opus 5.5 in Claude Code
How it was made
- Model
- Claude Opus 5.5
- Build subagents
- 6
- Orchestrator
- 1
- Mobbin searches
- 57
- Design skills
- 11
- Agent time
- ≈ 4 h
- Reviews from me
- 1
7 h after the X postSep 24–25, 2026
- Views
- 25.5K
- Bookmarks
- 598
- Demo visitors
- 433
What it is
The people make the calls. Its five agents (Scout, Scribe, Ledger, Pilot and Echo) research accounts, draft follow-ups, watch renewals, keep the pipeline current and prep meetings, and every action they take carries its receipt.
Everything in it is fictional: the company, the team and all 24 accounts. The numbers agree on every screen, and a script checks them.
Claude Opus 5.5 agents built it in Claude Code in about four hours, from one brief and one review from me. It runs as a static site, so click anything: nothing is saved.
The screens
How it was built
One orchestrating agent ran the day. It wrote the plan, handed out the pages, reviewed every screen from screenshots and sent back fixes.
- 06:00
One brief goes in
The product, a fictional world whose numbers must agree, and the bar it had to beat.
- 06:05
The foundation agent
Design system, app shell, the whole dataset and the Today page. Done by 07:05.
- 07:10
Two agents in parallel
Records built the accounts table and record pages. Work & Crew built the delegation board and the agents.
- 08:00
One round of fixes
The orchestrating agent reviewed every page from screenshots and sent each agent its list.
- 08:05
First version done
Build and lint clean. Nothing posted yet.
- Afternoon
My one review
I looked at the first version and chose to build the two stub pages, People and Deals.
- 16:45
Three more agents
People, Deals, and a chart-and-color pass that gave every chart color one job. Done at 18:25.
- Evening
Live, then posted
Exported as a static site, deployed, and posted on X with the live link.
The crew
Six subagents, each owning its own pages and folders, plus the orchestrator. They ran 57 Mobbin searches between them, and logged each one.
| Agent | What it owned | Mobbin | When |
|---|---|---|---|
| Foundation | Design system, shell, ⌘K palette, the dataset, Today | 15 | 06:05, alone |
| Records | Accounts table, record pages, the Delegate dialog | 14 | 07:10, in parallel |
| Work & Crew | Delegation board, agents page, Hire an agent, Review draft | 14 | 07:10, in parallel |
| People | 34 contacts and the person sheet | 6 | 16:45, in parallel |
| Deals | The pipeline by stage against the Q4 forecast | 8 | 16:45, in parallel |
| Chart and color pass | One chart grammar across Today's six tiles | — | 16:45, in parallel |
| Orchestrator | The plan, the hand-offs, one review round, the final passes | — | all day |
| Total | 6 subagents + 1 | 57 |
The skills, and who wrote them
11 design skills did most of the taste work. Each is a folder of written rules the agent loads when the task matches. Credit where it's due:
- emil-design-eng
- apple-design
- animate
- improve-animations
- find-animation-opportunities
- animation-vocabulary
npx skills add emilkowalski/skills- better-ui
npx skills add jakubkrehel/skills- impeccable
npx impeccable install- frontend-design
npx skills add anthropics/skills- web-design-guidelines
npx skills add vercel-labs/agent-skillsBuilt into Claude Code
- dataviz
Nothing to install
Also loaded, for the code rather than the look: vercel:nextjs and vercel:react-best-practices.
What the reviews caught
Every agent reviewed its own pages from screenshots, two to four rounds each. Some of what those rounds found:
Foundation, round 1
The third decision card was cut off at 900px, so Today was not a composed first screen.
Fix: a fixed preview well and tighter cards.
Foundation, round 4
The keyboard focus ring was invisible on most controls: utility classes outranked the base rule.
Fix: an unlayered focus rule.
Records, round 3
No view tab looked active. A tooltip overwrote the tab's state, and it only showed once the shot was cropped.
Fix: the tooltip moved inside the tab.
Work & Crew, round 1
Seven pulsing dots on one board: a spinner zoo.
Fix: only live timers pulse; everything else is a static dot.
Work & Crew, round 2
Board cards reacted to hover but did nothing on click.
Fix: each card opens its run: the instruction, every step, cost and receipts.
People, round 2
Two quick K presses moved only one row.
Fix: stepping reads the URL, not stale state.
Chart pass, orchestrator's round
The new neutral charts read duller than the first version by eye.
Fix: primary marks to full ink, secondary marks a step down.
Get the recipe behind Keel.
The Build File is everything behind the build, ready to copy. The product stays open; the recipe costs one email.
The Keel Build File
Free. Copy any part of it, or download the whole file.
- The brief
- The single prompt that started it, word for word.
- The crew
- Six agents: what each owned, in what order, and the prompt they started from.
- The rules
- The foundation doc every agent read before building a page.
- The skills
- All 11 design skills with install lines, authors, and what each changed.
- The sources
- All 57 Mobbin searches, and what each one brought back.
- The rounds
- What every review caught, and the fix.
- Rebuild it
- The steps from an empty folder, with the screenshot tool the agents used.