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Tool reference

get_retention

Returns revenueRetention, revenueRetentionDefinition, installCohorts and funnel.

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Purpose

Revenue retention (NRR/GRR, expansion/contraction/churn by month) and install cohort survival. Call for retention, NRR, GRR, expansion, or cohort questions.

Credentials and scope

Owner workspace credential. The credential determines tool visibility. For tools with appId, use the HeyCrust app UUID from list_apps; the dashboard app selector does not supply MCP arguments for you.

Inputs

  • appId: optional; string or null

Example request

The identifiers and merchant are fictional. Replace them with records returned for your own workspace; this example is schema-checked, not a promise that the fictional record exists.

json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_retention",
    "arguments": {
      "appId": "11111111-1111-4111-8111-111111111111"
    }
  }
}

POST this JSON to https://heycrust.com/api/mcp with Content-Type: application/json and Authorization: Bearer <YOUR_CREDENTIAL>. The tool result normally contains JSON encoded as text in result.content; inspect JSON-RPC errors and result.isError before using it.

Result

Returns revenueRetention, revenueRetentionDefinition, installCohorts and funnel. GRR/NRR and gross/net MRR loss include freeze effects, while the separate churned component excludes them.

Effects and verification

Reads existing records or definitions. It does not create a payment or send a message. Verify the returned app/merchant identity and source coverage before interpreting the result.

Troubleshooting

A missing tool can mean that the credential lacks its catalog or required scopes. Invalid arguments are different from unavailable source data or a record outside the workspace. A handler can return a business error even when the argument schema is valid. Read MCP overview and Help.

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