agentcard

get_balance

Idempotent

The user's cash balance: the money that funds new cards. Provisions the balance account on first use. Users add cash with Apple Pay or Google Pay in USD; funds are held as USDC. (Their wallet, meaning the cards themselves, is list_cards.)

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "get_balance"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Output Schema

Name	Required	Description
`status`	No	Balance account status.
`message`	Yes	Human-readable balance summary.
`balanceUsd`	No	Spendable cash balance in USD (string decimal).
`confirmingUsd`	No	Deposit clearing on-chain, not yet spendable (present only mid-deposit).

Schema Changelog

Changes observed during successful MCP inspections.

First observedJul 28, 2026

TDQS

A4.5/5.0

Behavior4/5

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

Discloses that the tool provisions the balance account on first use, a behavioral trait beyond annotations. Explains fund flow (Apple Pay/Google Pay to USDC). Annotations are consistent.

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 sentences, front-loaded with primary purpose, efficient and waste-free.

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?

Complete description for a simple read tool with no params and an output schema. Explains balance nature, provisioning, and sibling differentiation.

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

Parameters4/5

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

No parameters, so baseline 4. Description adds value by explaining what the returned balance represents and its source, compensating for lack of params.

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

Purpose5/5

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

Clearly states the tool returns the user's cash balance for funding cards. Differentiates from list_cards by specifying that cards themselves are listed elsewhere, providing clear sibling distinction.

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?

Provides context that balance account is provisioned on first use and describes funding sources. However, lacks explicit when-to-use vs alternatives like get_card_balance, though differentiation is implied.

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

All agentcard tools Inspect

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