claw-mcp-toolkit

finance_forex_rate

Retrieve current exchange rates between currencies to calculate conversion amounts for financial planning or transactions.

Instructions

Get current exchange rate between two currencies

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": "finance_forex_rate"
  }
}

Input Schema

Name	Required	Description	Default
`from`	No	Source currency code	USD
`to`	No	Target currency code	BRL
`amount`	No	Amount to convert

Schema Changelog

Changes observed during successful MCP inspections.

First observedv1.0.0Mar 23, 2026

TDQS

C2.9/5.0

Behavior2/5

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 states 'current' but provides no context on data freshness (real-time vs daily fix), rate type (bid/ask/mid), supported currency pairs, or error handling for invalid codes. This leaves significant behavioral gaps.

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

Conciseness4/5

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

The description is extremely concise at 7 words with no redundancy. Every word serves a purpose. However, given the lack of annotations and output schema, the brevity slightly undermines contextual completeness—one additional sentence on behavior or return values would improve utility without sacrificing clarity.

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

Completeness2/5

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

With no output schema and no annotations, the description should disclose what the tool returns (exchange rate value? converted amount? timestamp?). It also fails to clarify that the tool supports amount conversion (implied by the 'amount' parameter) rather than just rate lookup, leaving functional ambiguity.

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 description coverage is 100%, establishing a baseline of 3. The description mentions 'between two currencies' which aligns with the 'from' and 'to' parameters, but it fails to acknowledge the 'amount' parameter's role in conversion versus simple rate retrieval, adding minimal semantic value beyond the schema itself.

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?

The description uses a specific verb ('Get') and clearly identifies the resource ('exchange rate between two currencies'). It implicitly distinguishes from crypto-focused siblings (crypto_price, stbtcx_price) by using 'currencies' instead of 'crypto', though explicit differentiation would strengthen it further.

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

Usage Guidelines2/5

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

No guidance provided on when to use this versus sibling tools like finance_stock_price or crypto_price. No mention of prerequisites, such as needing valid ISO currency codes, or when this data source is preferable to others.

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