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Fewsats

Fewsats MCP Server

Official
by Fewsats
OverviewSchemaRelated ServersScoreDiscussions
Python
Remote

balance

Check wallet balance to monitor funds and troubleshoot payment issues. This tool helps verify available funds before making purchases through the Fewsats MCP Server.

Instructions

Retrieve the balance of the user's wallet. You will rarely need to call this unless instructed by the user, or to troubleshoot payment issues. Fewsats will automatically add balance when needed.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • src/fewsats_mcp/server.py:14-19 (handler)
    The handler function for the 'balance' MCP tool. It is decorated with @mcp.tool() for registration and executes the logic by calling Fewsats().balance() via the handle_response helper.
    @mcp.tool()
async def balance() -> str:
    """Retrieve the balance of the user's wallet.
    You will rarely need to call this unless instructed by the user, or to troubleshoot payment issues.
    Fewsats will automatically add balance when needed."""
    return handle_response(Fewsats().balance())

Tool Definition Quality

A4.6/5.0
Behavior4/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes key behaviors: it's a read operation ('Retrieve'), it accesses user-specific data ('user's wallet'), and it mentions automatic balance management by Fewsats. However, it lacks details on error handling or response format, which could be useful for troubleshooting.

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?

The description is highly concise and well-structured, with three sentences that each serve a distinct purpose: stating the tool's function, providing usage guidelines, and explaining automated context. There is no wasted text, and key information is front-loaded for quick comprehension.

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

Completeness4/5

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

Given the tool's simplicity (0 parameters, no annotations, no output schema), the description is largely complete. It covers purpose, usage, and behavioral context. However, without an output schema, it doesn't specify what the balance retrieval returns (e.g., currency, format), which could be a minor gap for troubleshooting scenarios.

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?

The tool has 0 parameters, and schema description coverage is 100%, so no parameter documentation is needed. The description appropriately doesn't discuss parameters, focusing instead on the tool's purpose and usage. A baseline of 4 is applied since no parameters exist, and the description adds value without redundancy.

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?

The description clearly states the tool's purpose with a specific verb ('Retrieve') and resource ('balance of the user's wallet'), making it immediately understandable. It distinguishes this tool from siblings like 'billing_info' or 'payment_methods' by focusing on wallet balance retrieval rather than payment details or methods.

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

Usage Guidelines5/5

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

The description provides explicit usage guidelines, stating 'You will rarely need to call this unless instructed by the user, or to troubleshoot payment issues.' This clearly indicates when to use the tool (user instruction or troubleshooting) and implies when not to use it (routine operations, as Fewsats handles balance automatically).

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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