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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint=false, covering the safety profile. The description adds value by specifying exactly what information is returned (fields, geometry type, record count, capabilities), which is beyond the annotations and aligns with them. No contradictions.

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 a single, front-loaded sentence that efficiently communicates the tool's purpose and expected output. Every word adds value with no redundancy or filler.

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 schema-retrieval tool with one parameter and no output schema, the description provides a sufficient list of the returned data categories (fields, geometry type, record count, capabilities). It is complete enough for an agent to understand what to expect without needing additional details.

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 provides full coverage for the single 'url' parameter with a clear description and example. The tool description adds nothing beyond repeating 'by url', so the schema carries the semantic burden. This aligns with the baseline of 3 for high schema coverage.

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 uses the specific verb 'Get' and identifies the resource as 'an ArcGIS Feature/Map Service layer's schema'. It explicitly lists the returned details: fields (name + type), geometry type, total record count, and capabilities. This distinguishes it from sibling tools like query_layer, which likely retrieves data rather than schema.

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 clearly indicates this tool is for obtaining schema information by URL, making the usage context evident. However, it does not explicitly mention when not to use this tool or name alternatives directly, though siblings like query_layer imply data retrieval. This is a clear context without explicit exclusions.

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