Koskamo

Dunn MCP

An official MCP server by Dunn that provides tools for calculating invoice due dates based on payment terms, computing late fees, determining how late an invoice is, and generating polite or firm payment reminder emails. It performs calculations and text generation without storing user data or requiring authentication.

Visit Defiance Media LLC

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Dunn MCP logo, by Defiance Media LLCVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by Defiance Media LLC
MCP endpoint (Streamable HTTP)
https://getdunn.org/mcp
Vendor documentation

What its tools do

4 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (4)

4 of 4 have a description · 4 of 4 declare behavior hints · 3 of 4 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to getdunn.org ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Calculate exact due dates for terms like net 30 or EOM
  • Compute late fees and new invoice totals
  • Determine days late and next steps for overdue invoices
  • Generate payment reminder emails for clients

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: org.getdunn/dunn@1.0.0Project website

Protocol and capabilities

Server
Dunn 1.0.0
MCP protocol negotiated in check
2025-11-25
Tools
4 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Dunn helps freelancers and small businesses get paid on time. Use these tools for exact invoice due dates, late-fee amounts and dates, how late an invoice is, and reminder emails. Dates are YYYY-MM-DD; "today" defaults to the date in New York.

Tools

4 advertised

invoice_due_date — Due date from payment terms
Advertised by the server during the last successful anonymous check.
Advertised read-only

Exact due date for an invoice from its date and payment terms ("net 30", "due on receipt", "EOM", "net 30 EOM", "2/10 net 30"), including any early-payment discount date.

invoice_due_date input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "invoice_date",
    "terms"
  ],
  "properties": {
    "terms": {
      "type": "string",
      "description": "Payment terms, e.g. \"net 30\""
    },
    "invoice_date": {
      "type": "string",
      "description": "A calendar date, YYYY-MM-DD"
    }
  }
}
invoice_due_date annotations
{
  "title": "Due date from payment terms",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
late_fee_calculator — Late fee calculator
Advertised by the server during the last successful anonymous check.
Advertised read-only

Works out a late fee: the amount, the new total, the exact day it applies, a ready-to-use line for the invoice, and whether the fee is in the usual range.

late_fee_calculator input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "amount",
    "due_date",
    "fee_kind",
    "fee_value",
    "grace_days"
  ],
  "properties": {
    "amount": {
      "type": "number",
      "description": "Invoice amount in US dollars"
    },
    "due_date": {
      "type": "string",
      "description": "A calendar date, YYYY-MM-DD"
    },
    "fee_kind": {
      "enum": [
        "flat",
        "percent"
      ],
      "type": "string",
      "description": "flat = a dollar amount, percent = % of the invoice"
    },
    "fee_value": {
      "type": "number",
      "description": "Dollars for flat (e.g. 25) or the percent for percent (e.g. 1.5)"
    },
    "grace_days": {
      "type": "integer",
      "maximum": 9007199254740991,
      "minimum": -9007199254740991,
      "description": "Days after the due date before the fee applies; 0 = the day after the due date"
    }
  }
}
late_fee_calculator annotations
{
  "title": "Late fee calculator",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
how_late_is_this_invoice — How late is this invoice?
Advertised by the server during the last successful anonymous check.
Advertised read-only

How many days late an invoice is (or until it is due), and what to send the client now and next, following a proven reminder schedule.

how_late_is_this_invoice input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "due_date"
  ],
  "properties": {
    "today": {
      "type": "string",
      "description": "Today's date, YYYY-MM-DD (defaults to today in New York)"
    },
    "due_date": {
      "type": "string",
      "description": "A calendar date, YYYY-MM-DD"
    }
  }
}
how_late_is_this_invoice annotations
{
  "title": "How late is this invoice?",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
payment_reminder_email — Payment reminder email
Advertised by the server during the last successful anonymous check.
Advertised read-only

Writes the right payment reminder for where the invoice is now (before due, due today, late, or a final notice), with subject line. Polite by default; firm on request.

payment_reminder_email input schema
{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "client_name",
    "sender_name",
    "amount",
    "due_date"
  ],
  "properties": {
    "tone": {
      "enum": [
        "friendly",
        "firm"
      ],
      "type": "string"
    },
    "today": {
      "type": "string",
      "description": "A calendar date, YYYY-MM-DD"
    },
    "amount": {
      "type": "number",
      "description": "Invoice amount in US dollars"
    },
    "due_date": {
      "type": "string",
      "description": "A calendar date, YYYY-MM-DD"
    },
    "late_fee": {
      "type": "string",
      "description": "The agreed late-fee terms, e.g. \"a $25 late fee applies if unpaid 7 days after the due date.\""
    },
    "pay_link": {
      "type": "string",
      "description": "Payment link to include, if any"
    },
    "client_name": {
      "type": "string",
      "description": "The client's name, as you'd greet them"
    },
    "sender_name": {
      "type": "string",
      "description": "Your name, to sign the email"
    },
    "business_name": {
      "type": "string"
    },
    "invoice_number": {
      "type": "string"
    }
  }
}
payment_reminder_email annotations
{
  "title": "Payment reminder email",
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

  1. 2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
600 ms
95th percentile latency
600 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 600 ms · metadata changed · 4 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http dunn-mcp https://getdunn.org/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add dunn-mcp --url https://getdunn.org/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable dunn-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "dunn-mcp": {
      "url": "https://getdunn.org/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "dunn-mcp": {
      "type": "streamableHttp",
      "url": "https://getdunn.org/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start dunn-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "dunn-mcp": {
      "type": "http",
      "url": "https://getdunn.org/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http dunn-mcp https://getdunn.org/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://getdunn.org/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "dunn-mcp": {
      "serverUrl": "https://getdunn.org/mcp"
    }
  }
}

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