One EU country: head of government and state, coalition, national parliament seats by party with governing parties, next national election, European election 2024 results, unemployment, inflation, energy prices.
| Name | Required | Description | Default |
|---|---|---|---|
| country | Yes |
Changes observed during successful MCP inspections.
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations exist, so the description carries the full burden. It does disclose the breadth of returned data, which is genuinely useful since there is no output schema, but it says nothing about read-only nature, valid country identifier format, error behavior for non-EU or unknown countries, or data freshness.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
A single dense sentence with zero filler; the scope ('One EU country') is front-loaded before the content enumeration. It is a long comma list, but every item is informative rather than padding.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With no output schema, the description appropriately enumerates returned fields, which is the right move. However, it omits the country-identifier format and any failure modes, leaving real gaps for an agent that must construct the call correctly.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0% — the single 'country' parameter has only a title and no description. The phrase 'One EU country' implies the parameter selects a country but gives no format (ISO code vs. name vs. slug), so the description fails to compensate for the schema gap.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The name supplies the verb+resource ('get' an 'EU country') and the description enumerates exactly what that resource contains (head of state/government, coalition, parliament seats, elections, economic indicators). It is clearly a single-country profile tool, distinguishable from the plural sibling compare_eu_countries, though the description itself never states the purpose in a sentence.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
No guidance on when to use this versus alternatives. The most obvious alternative, compare_eu_countries, is never mentioned, nor is any condition (e.g. 'use for one country, use compare for multiple'). Usage must be inferred entirely from the field list.
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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