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Jonathan Hefner 4ca20f21c4

Smoothen the process of getting started (#103 )

* Restructure threejs-server README to match marketing examples

- Update title format to "Example: Three.js App"
- Constrain screenshot width using table layout
- Add Features section with key capabilities
- Reorganize Running section with Tool Input subsection
- Add Architecture section describing server and app components
- Remove implementation-focused sections (WidgetProps, Creating a New Widget)

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add bun as devDependency to example packages

npm install now automatically installs bun, eliminating the need for
separate installation instructions. Removed manual bun install step
from customer-segmentation-server README.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add start:http and start:stdio npm scripts to examples

For the 6 examples supporting --stdio transport, add explicit scripts:
- serve:http / serve:stdio for running the server
- start:http / start:stdio for build + serve
- start now aliases to start:http for backward compatibility

Update READMEs to document both transport options.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Default basic-host SERVERS to localhost:3001/mcp

- Change threejs-server default port from 3109 to 3001 for consistency
- Add default SERVERS value in basic-host serve.ts
- Document SERVERS env var in basic-host README

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Improve Examples section in README

Frame the three basic examples as foundational starting points and
add a link to the examples directory for additional demo apps.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

2025-12-09 16:15:32 +01:00

2.6 KiB

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Example: Cohort Heatmap App

A demo MCP App that displays cohort retention data as an interactive heatmap, showing customer retention over time by signup month.

Features

Cohort Retention Heatmap: Color-coded grid showing retention percentages across cohorts and time periods
Multiple Metrics: Switch between Retention %, Revenue Retention, and Active Users
Period Types: View data by monthly or weekly intervals
Interactive Exploration: Hover cells for detailed tooltips, click to highlight rows/columns
Color Scale: Green (high retention) through yellow to red (low retention)
Theme Support: Adapts to light/dark mode preferences

Running

Install dependencies:
```
npm install
```

Build and start the server:

npm run start:http  # for Streamable HTTP transport
# OR
npm run start:stdio  # for stdio transport

View using the basic-host example or another MCP Apps-compatible host.

Architecture

Server (`server.ts`)

Exposes a single get-cohort-data tool that returns:

Cohort rows with signup month, original user count, and retention cells
Period headers and labels
Configurable parameters: metric type, period type, cohort count, max periods

The tool generates synthetic cohort data using an exponential decay model with configurable retention curves per metric type.

App (`src/mcp-app.tsx`)

Uses React for the heatmap visualization
Fetches data on mount and when filters change
Displays retention percentages in a grid with HSL color interpolation
Shows detailed tooltips on hover with user counts and exact retention values
Supports row/column highlighting on cell click

2.6 KiB Raw Blame History