@retentioncheck/mcp-server

MCP server for AI-powered churn analysis. Analyze customer cancellation feedback to identify churn patterns, severity ratings, and actionable recommendations.

Tools

analyze_churn

Analyze cancellation feedback to identify why customers are leaving.

Input:

• feedback (string, required) , cancellation responses, one per line
• focus (string, optional) , narrow analysis to a specific area (e.g., "pricing")

Output: Structured JSON with executive summary, priority action, and categorized insights (reason, count, percentage, severity, confidence, examples, recommendation).

analyze_stripe_churn

Pull canceled subscriptions directly from Stripe and analyze them , no middleware, no DB hookup. Each cancellation is enriched with plan, MRR, sub age, and voluntary vs. involuntary context before being fed to Claude.

Input:

• lookback_days (number, optional) , how many days back to analyze. Defaults to 90. Min 7. Max 365.
• focus (string, optional) , narrow analysis to a specific area (e.g., "pricing")

Requires: STRIPE_SECRET_KEY env var. Use a restricted (read-only) key, not your live secret key. Create one at dashboard.stripe.com/apikeys/create with these permissions:

• Subscriptions: Read
• Customers: Read
• Prices: Read

Output: Same shape as analyze_churn, plus a stripeContext block with totalCanceled, activeSubs, voluntaryCount, involuntaryCount, totalMrrLost, truncated, lowSample, nonUsdSkipped, and noFeedbackRate. When there's not enough data, the Churn Health Score is null rather than fabricated.

analyze_sql_churn

Pull canceled subscriptions directly from Postgres or MySQL and analyze them , zero middleware, zero backend. You describe your schema in plain arguments (table name, column names) and the tool generates a safe parameterized SELECT query internally.

Input:

• dialect ("postgres" | "mysql", required) , which SQL database you're using.
• schema (object, required):
  • table (string, required) , table containing subscription/cancellation records.
  • cancelled_at_column (string, required) , column storing cancellation timestamp.
  • reason_column (string, optional) , column storing cancellation reason.
  • comment_column (string, optional) , column storing free-text comments.
  • mrr_column (string, optional) , column storing monthly revenue.
  • mrr_unit ("dollars" | "cents", optional) , defaults to "dollars". Use "cents" for Stripe-style integer storage.
  • customer_tenure_days_column (string, optional) , column for sub age in days.
  • status_filter (object, optional) , { column, value } filter for canceled-only rows.
• lookback_days (number, optional) , defaults to 90. Min 7. Max 365.
• focus (string, optional) , narrow analysis to a specific area.

Requires: POSTGRES_URL or MYSQL_URL env var (matching the dialect). Use a read-only database user, not your app DB user. Example Postgres setup:

CREATE USER retentioncheck_readonly WITH PASSWORD 'use-a-strong-password';
GRANT CONNECT ON DATABASE your_db TO retentioncheck_readonly;
GRANT USAGE ON SCHEMA public TO retentioncheck_readonly;
GRANT SELECT ON subscriptions TO retentioncheck_readonly;

Example MySQL setup:

CREATE USER 'retentioncheck_readonly'@'%' IDENTIFIED BY 'use-a-strong-password';
GRANT SELECT ON your_db.subscriptions TO 'retentioncheck_readonly'@'%';
FLUSH PRIVILEGES;

Safety: 500-row hard cap, 15-second statement timeout, identifier allowlist validation (rejects any table/column name outside [a-zA-Z_][a-zA-Z0-9_]*), all literal values parameterized, three schema-mismatch probes before the main query to give actionable errors instead of silent empty output, SSL warning when the connection isn't encrypted. Read-only user is the single most important safety layer. Full design notes in docs/2026-04-08-analyze-sql-churn-design.md.

Output: Same shape as analyze_churn, plus a sqlContext block with dialect, dateRange, totalCanceled, totalMrr, truncated, lowSample, noFeedbackRate, and sslEnabled.

get_example_analysis

See a pre-computed example analysis. No API key required.

Input:

• scenario (string, optional) , "b2b-saas" (default), "consumer-app", or "pricing"

Installation

Claude Desktop / Claude Code

Add to your MCP config (claude_desktop_config.json or .claude.json):

{
  "mcpServers": {
    "retentioncheck": {
      "command": "npx",
      "args": ["-y", "@retentioncheck/mcp-server"],
      "env": {
        "ANTHROPIC_API_KEY": "your-anthropic-key",
        "STRIPE_SECRET_KEY": "rk_live_...",
        "POSTGRES_URL": "postgres://ro_user:pass@host:5432/db?sslmode=require",
        "MYSQL_URL": "mysql://ro_user:pass@host:3306/db?ssl=true"
      }
    }
  }
}

Only ANTHROPIC_API_KEY is required. STRIPE_SECRET_KEY is needed for analyze_stripe_churn. POSTGRES_URL or MYSQL_URL is needed for analyze_sql_churn (depending on which dialect you use). Omit any you don't need.

Cursor

Add to Cursor MCP settings with the same configuration.

Requirements

• Node.js 20+
• Anthropic API key (for analyze_churn, analyze_stripe_churn, and analyze_sql_churn)
• Stripe restricted key (optional, for analyze_stripe_churn)
• Postgres or MySQL read-only database user (optional, for analyze_sql_churn)

Example Usage

Ask your AI assistant:

• "Analyze my cancellation feedback" (then paste your data)
• "Show me an example churn analysis"
• "Why are my customers churning?" (then provide feedback)

Full App

For history, trend tracking, PDF exports, team sharing, and more: retentioncheck.com

Anonymous Telemetry

Starting in 0.2.0, this package sends anonymous usage events to help us understand which tools are used and how. We track:

• A randomly generated install ID (UUID, persisted to ~/.retentioncheck-mcp/install-id.json)
• Which tool was called (analyze_churn, analyze_stripe_churn, analyze_sql_churn, or get_example_analysis)
• Whether the call succeeded or failed (and a generic error category if it failed)
• Item count for analysis tools (how many feedback rows/subscriptions were analyzed)
• For analyze_sql_churn: dialect (postgres or mysql) and whether SSL was enabled
• For analyze_stripe_churn: mode (live or test)
• MCP server version, Node version, platform/arch

We do NOT track:

• The feedback text itself
• Your Anthropic API key or any credentials
• Any PII, IP address, hostname, or user identity

To opt out, set RETENTIONCHECK_TELEMETRY=0 in your MCP server's env config:

{
  "mcpServers": {
    "retentioncheck": {
      "command": "npx",
      "args": ["-y", "@retentioncheck/mcp-server"],
      "env": {
        "ANTHROPIC_API_KEY": "your-api-key-here",
        "RETENTIONCHECK_TELEMETRY": "0"
      }
    }
  }
}

You can also delete ~/.retentioncheck-mcp/install-id.json at any time to reset your anonymous install ID.

License

MIT