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Polygon-io MCP Server

Polygon-io MCP Server

Official
by massive-com
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

get_real_time_currency_conversion

Convert currencies in real-time using Polygon-io MCP Server. Input source and target currencies with optional amount and precision for accurate exchange rate results.

Instructions

Get real-time currency conversion.

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": {
      "from_": "<from_>",
      "to": "<to>"
    },
    "name": "get_real_time_currency_conversion"
  }
}

Input Schema

NameRequiredDescriptionDefault
amountNo
from_Yes
paramsNo
precisionNo
toYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.6/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the action ('Get real-time currency conversion') without details on permissions, rate limits, data sources, or output format. This is insufficient for a tool with potential real-time data implications.

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 extremely concise with a single sentence ('Get real-time currency conversion.'), which is front-loaded and wastes no words. It efficiently states the core purpose without unnecessary elaboration.

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?

Given the complexity (real-time data conversion), lack of annotations, 0% schema coverage, no output schema, and five parameters, the description is incomplete. It fails to provide necessary context on behavior, parameters, or output, making it inadequate for effective tool use.

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

Parameters2/5

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

Schema description coverage is 0%, so the description must compensate for all parameters. It mentions 'currency conversion' but does not explain the five parameters (e.g., 'from_', 'to', 'amount', 'precision', 'params'), their roles, or expected formats. This leaves parameters largely undocumented.

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

Purpose3/5

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

The description states the tool's purpose ('Get real-time currency conversion'), which is clear but vague. It specifies the verb ('Get') and resource ('currency conversion'), but lacks detail on scope or differentiation from siblings like 'get_last_forex_quote'. It's not tautological but remains generic.

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 is provided on when to use this tool versus alternatives. The description does not mention any context, prerequisites, or exclusions, nor does it reference sibling tools. This leaves the agent without direction for tool selection.

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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