send_reminder
Send an overdue reminder email for a specific invoice. Requires the invoice has balanceDue > 0 and the customer has an email on file. Uses the org's SMTP config or fallback.
What send_reminder does
Sends or emails the reminder to the customer using the organization's configured SMTP settings.
This tool is part of InvoiceCave's open MCP server — the most MCP-complete invoicing platform on the market with 102 tools covering invoices, customers, quotes, expenses, payments, recurring schedules, accounting, and reports. Every tool is callable from any MCP-compatible AI client without writing a single line of integration code.
How an AI uses send_reminder
Use after creating or updating a record when the AI needs to actually deliver it. Email logs are recorded against the org and visible in the dashboard. If SMTP isn't set up, the call fails fast with a clear error so the AI can prompt the user to configure it.
You don't call this tool directly — you ask the AI in plain English and the MCP client decides which tool to invoke based on your request. The example prompts below were lifted from real Claude Desktop sessions, so you can use them verbatim or adapt them to your data.
Parameters
send_reminder accepts 3 parameters — 1 required, 2 optional. The AI fills these in from your natural-language prompt; you never write them by hand.
| Parameter | Type | Required | Description |
|---|---|---|---|
| invoiceId | string | required | Invoice ID to send reminder for |
| customSubject | string | optional | Override the default reminder subject |
| customMessage | string | optional | Override the default reminder message |
Request example
Under the hood, your AI client sends a JSON-RPC 2.0 tools/call request to InvoiceCave's MCP endpoint at https://www.invoicecave.com/api/mcp/mcp. Here's what a send_reminder call looks like:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "send_reminder",
"arguments": {
"invoiceId": "inv_a1b2c3d4",
"customSubject": "Thanks for your business",
"customMessage": "Thanks for your business"
}
}
}You won't write this yourself — it's shown so developers can see exactly what the MCP client generates. The arguments object maps 1:1 to the parameters above. Authentication is handled by the Authorization: Bearer header with your API key.
Example AI prompts
Type any of these into Claude Desktop, Claude Code, or Cursor — InvoiceCave's MCP server will route them to send_reminder automatically.
“Send an overdue reminder to every customer with invoices past 30 days due.”
Use it in 30 seconds
Related tools
More from the Reminders & Late Fees category.
set_reminder_settingsConfigure automatic overdue-reminder settings (which days after due date, default subject/message, sendTime).
set_late_fee_settingsConfigure late-fee policy (flat or percentage, grace period, once or recurring).
apply_late_feeManually apply the configured late fee to an invoice. Requires set_late_fee_settings(enabled=true) and a value > 0. Adds the fee as an adjustment, recalculates total + balance.
FAQ — send_reminder
What is send_reminder?▾
send_reminder is one of 102 tools in InvoiceCave's MCP server. Sends or emails the reminder to the customer using the organization's configured SMTP settings. It's invoked automatically when an AI client like Claude or Cursor decides the user's request maps to this action.
Which AI clients can call send_reminder?▾
Any MCP-compatible client. We've tested it with Claude Desktop, Claude Code, Cursor, Windsurf, and Codex. The MCP protocol is open, so any AI tool that speaks MCP can call this endpoint with a valid InvoiceCave API key.
Is calling send_reminder secure?▾
Yes. Every call is authenticated by the API key you mint in the dashboard, scoped to a single organization, rate-limited per key, and recorded in the audit log with source='mcp'. Sensitive fields (SMTP passwords, encryption keys) are never returned to the AI client.
What parameters does send_reminder take?▾
send_reminder accepts 3 parameters — 1 required (invoiceId) and 2 optional. The AI populates these from your plain-English prompt — see the parameter table and request example above.
Does send_reminder count against any quota?▾
MCP tool calls are unmetered on the free plan up to a generous monthly limit. Once you connect Stripe and start charging your customers, every call still counts against the same per-key rate limit but doesn't add to your bill.
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