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by io.github.whiteknightonhorse
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List Tatoeba Languages

language.tatoeba.languages
Read-onlyIdempotent

List all 429 supported languages on Tatoeba with ISO 639-3 codes and sentence counts. Tatoeba CC-BY 2.0 FR

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": "language.tatoeba.languages"
  }
}

Input Schema

NameRequiredDescriptionDefault
refreshNoSet to true to bypass cache and fetch the latest list of supported languages with sentence counts.

Output Schema

NameRequiredDescriptionDefault
errorNoPresent only when the call failed. Includes error code, message, request_id, and any provider-specific extras.
resultNoTool response payload. Shape varies per tool — consult the tool description and inputSchema. May be an object, array, string, or number depending on the upstream provider response.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observed

TDQS

A3.9/5.0
Behavior3/5

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

Annotations already provide readOnlyHint=true, destructiveHint=false, idempotentHint=true, openWorldHint=true. The description adds licensing info (CC-BY 2.0 FR) and the number of languages, but does not contradict annotations. It lacks behavioral details beyond annotations, so it meets expectations.

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 two sentences, front-loaded with the core action and result. Every sentence adds value: the first lists purpose and output, the second adds attribution. No fluff.

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?

Given the output schema exists and annotations cover safety, the description is complete for a simple listing tool. It specifies the count, data fields, and licensing. No gaps noted.

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% (refresh parameter documented). The tool description does not add additional meaning beyond the schema. Baseline 3 is appropriate.

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 lists all 429 supported languages on Tatoeba with ISO 639-3 codes and sentence counts. It differentiates from sibling tools like language.tatoeba.search and language.tatoeba.sentence by its specific resource (languages vs sentences).

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 does not provide explicit when-to-use or when-not-to-use guidance, nor alternatives. However, the name and content imply its use case (listing languages). Without explicit context, it is adequate but not strong.

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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