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Finance Fintech Mcp

by io.github.varvararatta
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get_crypto_price

Get cryptocurrency spot price via CoinGecko (no API key). symbol: btc, eth, sol, etc. Returns: {symbol, id, price, currency}

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": {
      "symbol": "<symbol>"
    },
    "name": "get_crypto_price"
  }
}

Input Schema

NameRequiredDescriptionDefault
symbolYes
vs_currencyNousd

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A4.3/5.0
Behavior4/5

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

With no annotations, the description carries the full burden. It discloses the external data source (CoinGecko), that no API key is required, and the return format partially. This provides useful behavioral context beyond the schema.

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 very concise: two sentences that efficiently convey purpose, source, input examples, and output format. No unnecessary words.

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 simple tool with 2 parameters and no output schema, the description adequately covers inputs (with examples) and output structure, enabling an agent to use it correctly.

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?

Schema has no descriptions for parameters (0% coverage). The description adds meaning to 'symbol' by listing examples (btc, eth, sol) and implies it's a crypto ticker. Though 'vs_currency' is not explained, its name and default value make it clear.

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 retrieves cryptocurrency spot prices via CoinGecko. It specifies verb 'Get', resource 'cryptocurrency spot price', and distinguishes from sibling tools (convert_currency, get_exchange_rates) by focusing on crypto prices.

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

Usage Guidelines3/5

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

The description implies usage by giving example symbols and noting no API key is needed, but does not explicitly state when to use this tool over alternatives like convert_currency, nor when not to use it.

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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