Your Entire Business. One Conversation.

YC MCP Apps Hackathon | Feb 21, 2026 | Y Combinator, SF

We replaced 8 SaaS tools with 7 natural-language prompts. In 90 seconds, a founder goes from "How's my business?" to closing a $150K deal — with real pipeline data, real intent signals, and a pricing simulator that tells you whether to discount or hold firm. All inside Claude.

This is not a hackathon prototype. This is 2 years of production infrastructure — 41 customers, $15.6K MRR, 82% gross margins — exposed through MCP in a single weekend.

---

Why This Matters

The $1T+ SaaS market is collapsing. HubSpot down 70%. ZoomInfo down 49%. Five CEO departures in 2025. Every founder still stitches together 8-12 disconnected tools that don't talk to each other.

Meanwhile, 800M people use ChatGPT weekly. Claude is where developers live. Both have zero business context — no pipeline, no customers, no revenue.

We fixed that. 32 MCP tools. 8 business domains. 12 interactive scenes. One conversation.

The founder asks a question. The AI workspace answers with live data, interactive charts, and actionable recommendations — not generic advice, but "Reema Batta at Figma has intent score 87/100, she visited your pricing page 6 times this week, here are your talking points for the call, and here's what happens to your runway if you offer 20% off."

---

The Demo (7 prompts, 90 seconds)

#	What you say	What happens
1	"How's my business doing this morning?"	Full business dashboard: $15.6K MRR, 82% margins, 41 customers, pipeline, tasks, notifications
2	"Tell me about Figma"	Live company profile via Apollo enrichment, auto-syncs $150K deal, key contacts
3	"What signals do we have on Figma?"	Reema Batta — VP Growth, intent 87/100, "Ready to Buy." 6 pricing page visits this week
4	"What if I offer 20% discount?"	Interactive slider. Drag to 10% → "TAKE THE DEAL." Drag to 35% → "DON'T DISCOUNT." Live Chart.js EV curves
5	"Show me the deal impact"	Financial narrative: MRR shift, margin impact, runway change, framing for Reema
6	"Prep me for the call"	Executive brief: talking points, do-not-do list, call script, warmest contact analysis
7	"I have an hour, what should I do?"	Time-boxed action plan: 5 tasks, $350K at stake, Go buttons that execute each task

Every scene links to every other scene. The slider talks back to the server. The Go buttons trigger real tool calls.

---

What Makes This Different

Bidirectional UI inside the AI workspace. The pricing simulator slider doesn't just display data — it calls app.callServerTool() to re-run financial models on every drag. The server responds, charts update, the verdict changes. This is not a static embed. This is a reactive application living inside Claude.

Real business, real data. $875K pipeline across 8 active deals. Person-level intent signals with behavioral scoring. Financial models that calculate close probability, expected value curves, and LTV impact. Not mock data for a demo — production APIs serving a live business.

32 tools, zero new infrastructure. Every tool is a thin MCP wrapper around existing Markster Panel REST APIs that serve 41 customers today. The hackathon didn't build a product. It proved a distribution model.

---

Architecture

+-----------------------------------------------------------+
|                   Claude / ChatGPT                         |
|                   (AI Workspace)                           |
+--------------------------+--------------------------------+
                           | MCP Protocol
+--------------------------+--------------------------------+
|              Markster MCP Server                           |
|  Express 5 + StreamableHTTPServerTransport                 |
|  32 tools + UI resource (single-file HTML bundle)          |
+------------------------------------------------------------+
|  +-----------+ +-----------+ +-----------+ +-----------+   |
|  | Customer  | | Content   | | Outreach  | |  Tasks    |   |
|  | Workspace | | Calendar  | | Pipeline  | | AI Team   |   |
|  +-----+-----+ +-----+-----+ +-----+-----+ +-----+-----+  |
|        |              |             |              |        |
|  +-----+--------------+-------------+--------------+----+  |
|  |           Markster Panel REST API                     |  |
|  |           panel.markster.io (production)              |  |
|  +-------------------------------------------------------+  |
|                                                             |
|  +-----------+ +-----------+ +-----------+ +-----------+   |
|  | Apollo    | | Impact    | | Pricing   | | Signals   |   |
|  | Enrich    | | Engine    | | Sim       | | Engine    |   |
|  +-----------+ +-----------+ +-----------+ +-----------+   |
|  Custom tools: live enrichment + financial modeling         |
+------------------------------------------------------------+
|  Interactive UI (Vite + vite-plugin-singlefile)            |
|  Chart.js | Bidirectional callServerTool() | 12 scenes     |
+------------------------------------------------------------+

12 Interactive Scenes

Scene	What it does	Interactive elements
Overview	Business bootstrap — KPIs, tasks, notifications	Traffic-light metrics, quick actions
Research	Company profiles, Apollo live enrichment	Real-time API calls, deal sync
People	Contact search, intent scoring	Profile cards, role context
Signals	Person-level buying signals	Ranked by intent score
Pricing	Discount simulation, EV curves	Slider, live charts, verdict
Deal Impact	Financial narrative per deal	Contextual framing per contact
Call Prep	Executive brief, talking points	Stitched from all available data
Outreach	Sequences, enrollment	Draft + send
Pipeline	Deals by stage, at-risk flags	$875K across 8 deals
Content	Calendar across 4 platforms, 15 posts	Status badges, live links
Cold Mail	Domain health, mailbox warmup	Infrastructure monitoring
Action Plan	Time-boxed priorities by revenue impact	Go buttons → execute tasks

---

32 Tool Inventory

Customer and CRM (8 tools)

Tool	Description
customer_workspace_snapshot	Unified customer state: profile, notifications, tasks, KPIs
customer_profile_manage	Read/update customer profile and onboarding data
contact_profile_workspace	Search, fetch, and manage contact profiles
company_profile_workspace	Search, fetch, and manage company profiles
onboarding_flow_manage	Start onboarding, persist step answers
onboarding_ai_assist	AI prefill, scoring, voice-pack generation
dashboard_insights	Dashboard slices, time-series, refresh
pipeline_workspace	CRM pipeline, trend history, at-risk deals

Tasks and AI Team (5 tools)

Tool	Description
task_workspace	Task overview, progress, initialization
task_action	Start, complete, reopen tasks, update notes
task_content_regenerate	Regenerate onboarding-generated content
ai_team_workspace	List AI agents, manage conversations
ai_team_chat_turn	Send message turn with SSE streaming

Content and Social (4 tools)

Tool	Description
content_calendar_workspace	Generate, list, get content calendars
content_post_workspace	Generate, edit, regenerate, approve social posts
content_audio_library	List, upload, delete audio tracks
content_social_accounts	Fetch CRM-connected social accounts

Outreach and Prospecting (4 tools)

Tool	Description
outreach_brand_assets_workspace	Manage brands, offers, personas
outreach_icp_workspace	Create, list, filter ideal customer profiles
outreach_sequence_workspace	Manage outbound sequence lifecycle
outreach_enrollment	Enroll leads into outreach campaigns

Knowledge and Artifacts (3 tools)

Tool	Description
customer_artifact_workspace	Create, list, edit, archive artifacts
customer_document_workspace	CRUD for customer documents
customer_data_change_review	Proposal queue + approval/rejection

Email Infrastructure (3 tools)

Tool	Description
domain_mailbox_manage	CRUD domain/mailbox with health checks
cold_mail_health	Setup status, warmup progress, inbox rate
customer_image_assets	Upload, delete profile photos and logos

Voice and Brand (1 tool)

Tool	Description
voice_pack_workspace	Voice-pack CRUD, set company default voice

Deal Intelligence (4 custom tools)

Tool	Description
sales_intelligence	Multi-mode: research (Apollo live), signals, pricing simulation
deal_impact	MRR, margin, runway, commission impact modeling
simulate_pricing	Discount simulation with close probability + EV curves
daily_priorities	Time-boxed action plans ranked by revenue impact

---

Tech Stack

Layer	Technology
MCP Server	@modelcontextprotocol/sdk 1.19.3 + Express 5.0.1
MCP Apps UI	@modelcontextprotocol/ext-apps 1.0.1
Deploy	@mcp-use/cli 2.13.5 (Manufact Cloud)
Auth	@workos-inc/node 8.5.0 (OAuth 2.1, AuthKit)
Bundler	Vite 6.3.5 + vite-plugin-singlefile (zero CSP, single HTML)
Charts	Chart.js (inline, bundled)
Validation	Zod 3.24.4 + OpenAPI schema generation
Language	TypeScript 5.8.3
Enrichment	Apollo API (live, any domain)
Financial Engine	Custom: close probability, EV curves, LTV modeling

Sponsor Technology Integration

Sponsor	How we use it
Anthropic	Claude is the primary AI workspace. MCP is the protocol.
OpenAI	ChatGPT is the second platform. Same server, same tools, same UI.
Puzzle	Financial metrics use Puzzle terminology: burn_multiple, spotlight_anomalies, cash_out_date. Direct API swap when available.
WorkOS	AuthKit + OAuth 2.1 for multi-tenant MCP authentication. RBAC in JWTs.
Cloudflare	DNS and email infrastructure. Domain health monitoring via cold_mail_health.
Manufact	One-command deploy to Manufact Cloud. MCP Apps scaffold via @mcp-use/cli.

---

Quick Start

npm install
npm run build
PORT=3002 npm run start

Verify:

curl -s http://127.0.0.1:3002/
curl -sS -H 'Accept: application/json, text/event-stream' \
  -H 'content-type: application/json' \
  -X POST http://127.0.0.1:3002/mcp \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'

Environment Variables

Variable	Required	Description
MARKSTER_API_BASE_URL	For live mode	Markster Panel API base URL
MARKSTER_CUSTOMER_API_KEY	For live mode	Customer token from Markster Panel
MARKSTER_MOCK_MODE	No	Set true for local mock responses
MARKSTER_TOOL_CALL_LOGGING	No	Set true for verbose tool logging
WORKOS_CLIENT_ID	For auth	WorkOS client ID
WORKOS_REDIRECT_URI	For auth	OAuth redirect URI
WORKOS_COOKIE_PASSWORD	For auth	Session cookie encryption key
PORT	No	Server port (default: 3000)

Deploy

npm run deploy   # One-command deploy to Manufact Cloud

MCP Validation CLI

npm run mcp:test -- check --endpoint http://127.0.0.1:3002/mcp
npm run mcp:test -- list-tools --endpoint http://127.0.0.1:3002/mcp
npm run mcp:test -- call --tool sales_intelligence \
  --args '{"mode":"research","company_name":"Anthropic"}' \
  --endpoint http://127.0.0.1:3002/mcp

---

Numbers

Metric	Value
MCP tools registered	32
UI scenes	12 interactive
Sponsor integrations	6 of 6
Bidirectional UI	Yes (slider talks back to server)
Live MRR	$15,628
Customers	41
Gross margin	82%
First client growth	9.2x in 15 months ($71K to $1.3M)
Pipeline	$875K across 8 deals
Employees	0 (both founders code daily)

---

Project Structure

.
├── server.ts                 # MCP server setup + tool registration
├── main.ts                   # Express app, auth, logo proxy, MCP routes
├── src/
│   ├── tools/
│   │   ├── markster-business-os.ts   # 28 Markster tool executors + registration
│   │   ├── daily-priorities.ts       # Action plan tool
│   │   ├── simulate-pricing.ts       # Pricing simulator
│   │   ├── deal-impact.ts            # Financial deal modeling
│   │   ├── prep-call.ts              # Call prep briefing
│   │   └── get-signals.ts            # Person-level signals
│   ├── services/
│   │   ├── impactEngine.ts           # Close probability, EV curves, LTV model
│   │   └── mockData.ts               # Pre-seeded company data, deal defaults
│   ├── ui/
│   │   └── app.ts                    # 4500+ line interactive UI (12 scenes)
│   ├── shared/
│   │   ├── marksterToolManifest.ts   # Tool catalog + schema definitions
│   │   └── markster-brand-pack.ts    # Visual system tokens
│   ├── markster/
│   │   └── client.ts                 # Markster Panel API client
│   └── types/
│       └── contracts.ts              # Zod schemas + TypeScript types
├── data/
│   ├── financials.json               # Puzzle-style financial baseline
│   ├── mock-signals.json             # Person-level intent signals
│   └── preseeded/                    # Apollo company cache (10 companies)
├── resources/
│   └── app.html                      # UI entry point (Vite builds to dist/)
└── docs/
    ├── demo-storyboard.md            # Demo script + Q&A playbook
    ├── design.md                     # Full architecture + positioning
    ├── ecosystem-poster.html         # Visual ecosystem map
    └── demo-page.html                # One-page project overview

---

Team

Ivan Ivanka (CEO) — on-site at YC SF. Pitch, demo, strategy. Attila Sukosd (CTO) — remote from Copenhagen. Engineering, MCP wiring, deploy.

Zero employees. Both founders code daily. First client grew 9.2x in 15 months.

markster.ai

---

28 production tools. Your entire business operating system. One conversation. We showed you one flow — try the rest.