xupersplit

Add a participant

add_participant

Add someone to an existing split. Works on simple, accountless splits. Secure splits (created by a signed-in user) are read-only here and must be opened in a browser.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "split": "<split>",
      "name": "<name>"
    },
    "name": "add_participant"
  }
}

Input Schema

Name	Required	Description	Default
`name`	Yes
`split`	Yes	The split key, or the whole https://split.xuper.fun/k/<key> link.

Output Schema

Name	Required	Description	Default
`key`	Yes
`url`	Yes
`title`	Yes
`secure`	Yes
`entries`	Yes
`settled`	Yes
`currency`	Yes
`created_at`	Yes
`settlement`	Yes
`total_spent`	Yes
`participants`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed4 schema fields changedNov 2, 2026
- removedOutput schema / properties / entries / items / properties / description / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / entries / items / properties / description / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / entries / items / properties / to / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / entries / items / properties / to / type
```
Added value: +[
+  "string",
+  "null"
+]
```
First observedAug 3, 2026

TDQS

A4.1/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare it is a non-read-only, non-destructive mutation, and the description adds real context beyond that: the split-type restriction and that secure splits silently won't work here. It does not describe the response shape, but an output schema exists to cover that.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Two tight sentences, front-loading the action and then the scoping constraint. No filler or repetition.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a two-parameter mutation with annotations covering safety and an output schema covering returns, the description supplies the key missing piece: which split types it works on and where secure splits must be handled instead. Nothing an agent needs to call it correctly is absent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 50%: the 'split' parameter documents accepting a key or full URL, but 'name' has no description. The description says "someone" and "existing split" but adds no format or constraint detail for either parameter, so it only marginally compensates for the gap.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource ("Add someone to an existing split"), so the action is unambiguous. It does not explicitly contrast with siblings like remove_participant or rename_participant, but the add-vs-remove/rename distinction is obvious from the verb.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly scopes applicability: works on simple, accountless splits; secure splits are read-only here and must be opened in a browser. This is a clear when/when-not statement, though the secure-split case points to a browser rather than naming any sibling tool.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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