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 explicitly states the return type: 'Returns the GeoJSON FeatureCollection as a JSON string.' This adds meaningful detail beyond the schema. It does not mention potential limitations (e.g., attribute preservation), but for a straightforward conversion tool this level of disclosure is adequate.

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?

The description is concise and front-loaded with the core action. The first sentence clearly states purpose and provides useful examples; the second sentence reveals the return format. There is no redundant content, and every sentence earns its place.

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?

For a simple single-parameter conversion tool with an output schema, the description covers the essential aspects: what it converts, what it returns, and typical use cases. It lacks explicit details about input format expectations (path vs. content) but overall is sufficiently complete for an agent to select and correctly invoke the tool.

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?

The input schema has only one parameter 'gpx' with no description, and the schema description coverage is 0%. The tool description implicitly explains that the parameter is the GPX file content by naming it and referencing track/route files, but it does not explicitly state that the string should contain GPX data or clarify whether it expects file contents or a path. The description adds some meaning but does not fully compensate for the missing schema documentation.

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 description clearly states the tool's function: converting a GPX file to GeoJSON. It names the source format (GPX) and target format (GeoJSON), distinguishes it from siblings like gpx_to_kml and kml_to_geojson, and provides example user intents ('convert my GPS track to GeoJSON', 'GPX to GeoJSON').

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?

The description gives clear context by mentioning common GPX sources (Garmin, Strava exports, hiking/cycling apps) and example phrasings that signal when to use the tool. It does not explicitly name alternative tools or state when not to use it, but the format-specific purpose makes the usage context evident.

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