d03123bb5c* docs: add local development MCP client configuration to READMEs Add instructions for configuring MCP clients to use locally-cloned and modified servers. This allows developers to test local changes with MCP clients like Claude Desktop or VS Code. - Top-level README: Added 'Local Development' section after npx config - All TypeScript examples: Added 'Local Development' subsection with bash one-liner that builds and runs the server - Python examples (qr-server, say-server): Added local path config * docs: include all servers in local development config * docs: use bash wrapper for Python server configs to enable tilde expansion
94 lines
3.3 KiB
Markdown
94 lines
3.3 KiB
Markdown
# Example: Cohort Heatmap App
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A demo MCP App that displays cohort retention data as an interactive heatmap, showing customer retention over time by signup month.
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<table>
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<tr>
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/01-initial-view.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/01-initial-view.png" alt="Initial view" width="100%"></a></td>
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/02-hover-state.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/02-hover-state.png" alt="Hover state" width="100%"></a></td>
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<td><a href="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/03-low-retention-hover.png"><img src="https://modelcontextprotocol.github.io/ext-apps/screenshots/cohort-heatmap-server/03-low-retention-hover.png" alt="Low retention hover" width="100%"></a></td>
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</tr>
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</table>
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## MCP Client Configuration
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Add to your MCP client configuration (stdio transport):
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```json
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{
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"mcpServers": {
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"cohort-heatmap": {
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"command": "npx",
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"args": [
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"-y",
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"--silent",
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"--registry=https://registry.npmjs.org/",
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"@modelcontextprotocol/server-cohort-heatmap",
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"--stdio"
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]
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}
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}
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}
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```
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### Local Development
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To test local modifications, use this configuration (replace `~/code/ext-apps` with your clone path):
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```json
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{
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"mcpServers": {
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"cohort-heatmap": {
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"command": "bash",
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"args": ["-c", "cd ~/code/ext-apps/examples/cohort-heatmap-server && npm run build >&2 && node dist/index.js --stdio"]
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}
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}
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}
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```
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## Features
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- **Cohort Retention Heatmap**: Color-coded grid showing retention percentages across cohorts and time periods
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- **Multiple Metrics**: Switch between Retention %, Revenue Retention, and Active Users
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- **Period Types**: View data by monthly or weekly intervals
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- **Interactive Exploration**: Hover cells for detailed tooltips, click to highlight rows/columns
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- **Color Scale**: Green (high retention) through yellow to red (low retention)
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- **Theme Support**: Adapts to light/dark mode preferences
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## Running
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1. Install dependencies:
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```bash
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npm install
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```
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2. Build and start the server:
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```bash
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npm run start:http # for Streamable HTTP transport
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# OR
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npm run start:stdio # for stdio transport
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```
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3. View using the [`basic-host`](https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/basic-host) example or another MCP Apps-compatible host.
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## Architecture
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### Server (`server.ts`)
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Exposes a single `get-cohort-data` tool that returns:
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- Cohort rows with signup month, original user count, and retention cells
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- Period headers and labels
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- Configurable parameters: metric type, period type, cohort count, max periods
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The tool generates synthetic cohort data using an exponential decay model with configurable retention curves per metric type.
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### App (`src/mcp-app.tsx`)
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- Uses React for the heatmap visualization
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- Fetches data on mount and when filters change
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- Displays retention percentages in a grid with HSL color interpolation
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- Shows detailed tooltips on hover with user counts and exact retention values
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- Supports row/column highlighting on cell click
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