298e884ec3* chore: add stable spec release 2026-01-26 - Use git mv to copy specification from draft to specification/2026-01-26/apps.mdx (preserves history) - Update status from 'Draft' to 'Stable (2026-01-26)' - Add specification version table to README - Update Resources section with links to both stable and draft specs * chore: bump version to 1.0.0 - Update main package version from 0.4.2 to 1.0.0 - Update all example package versions to 1.0.0 - Regenerate package-lock.json * prettier * chore: align protocol version with spec release 2026-01-26 - Add 'Protocol Version: 2026-01-26' to spec header - Update LATEST_PROTOCOL_VERSION from '2025-11-21' to '2026-01-26' - Update spec examples to use '2026-01-26' protocol version - Add '2025-11-21' to SUPPORTED_PROTOCOL_VERSIONS for backwards compatibility * chore: update spec references to stable 2026-01-26 - Update typedoc.config.mjs navigation link - Update docs/overview.md spec links (10 occurrences) - Update plugins/mcp-apps/skills/create-mcp-app/SKILL.md spec link - Update src/spec.types.ts @see links - Update AGENTS.md spec path - Regenerate src/generated/schema.ts with updated links * chore: simplify versioning - first stable release - Remove backwards compatibility version (2025-11-21) - this is the first stable release - Remove redundant 'Protocol Version' header - spec version IS the protocol version * chore: add history reference comment to stable spec
97 lines
3.3 KiB
Markdown
97 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": [
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"-c",
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"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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```
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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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