ChurnLens

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Buyer-side SaaS due-diligence maths: NRR, GRR, revenue concentration, zombie MRR, LTV:CAC.

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Copy this into your MCP client config:

{
  "mcpServers": {
    "ChurnLens": {
      "url": "https://churnlens.site/api/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (6)

• calculate_churn_rate

  Calculate net revenue retention (NRR), gross revenue retention (GRR), revenue churn and implied customer lifetime from one period's MRR movements. Also reports the NRR-minus-GRR spread, which reveals how much churn is being masked by expansion revenue.

  Parameters:

  • starting_mrr (required) — number — MRR at the start of the period, in any single currency unit.
  • churned_mrr — number — MRR lost to full cancellations.
  • expansion_mrr — number — MRR gained from upgrades and expansion within the existing base. Excludes new customers.
  • contraction_mrr — number — MRR lost to downgrades (customer retained).

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• analyze_revenue_concentration

  Assess customer concentration risk across a book of revenue using the Herfindahl-Hirschman Index (HHI), top-N share and whale detection. Answers the question every acquirer asks first: how much revenue walks out with one logo?

  Parameters:

  • customer_mrrs (required) — array — Per-customer MRR values. Order does not matter.
  • top_n — number — How many top customers to aggregate for the top-N share. Default 5.
  • whale_threshold_pct — number — Revenue share above which a customer counts as a whale. Default 25.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• detect_zombie_mrr

  Identify dormant-but-paying accounts — revenue that still counts in MRR but whose customers have stopped showing up. Zombie revenue is one renewal notice from cancelling and is invisible to standard revenue dashboards.

  Parameters:

  • accounts (required) — array — One entry per paying account.
  • threshold_days — number — Days of inactivity before an account counts as dormant. Default 90.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• score_saas_health

  Score a SaaS business 0-100 across five dimensions — retention, growth, concentration, efficiency and durability — and return the composite. Every mapping is published, so the score can be reconstructed by hand.

  Parameters:

  • monthly_churn_rate_pct (required) — number — Monthly revenue churn, as a percentage (5 means 5%).
  • nrr_pct (required) — number — Net revenue retention, as a percentage.
  • top_customer_share_pct (required) — number — Largest single customer's share of revenue, as a percentage.
  • ltv_to_cac_ratio (required) — number — Lifetime value divided by customer acquisition cost.
  • annual_plan_share_pct (required) — number — Share of revenue on annual contracts, as a percentage.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• calculate_ltv

  Calculate gross-margin-adjusted customer lifetime value, the LTV:CAC ratio and CAC payback in months. Omitting gross margin yields lifetime revenue rather than lifetime value — usually a third of the number.

  Parameters:

  • arpa (required) — number — Average revenue per account, per month.
  • monthly_churn_rate_pct (required) — number — Monthly churn, as a percentage.
  • cac — number — Customer acquisition cost. Optional — supply it to get the ratio and payback.
  • gross_margin_pct — number — Gross margin percentage. Defaults to 100, which gives lifetime revenue.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• get_scoring_bands

  Return the scoring thresholds ChurnLens applies to NRR, revenue concentration and the composite health score. These are bands, not measured benchmark data — the sourced benchmark figures are cited at https://churnlens.site/benchmarks.

  Parameters:

  • metric — string — Which band set to return: 'nrr', 'concentration', 'health', or omit for all.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

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