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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint, lowering the burden. The description adds meaningful behavioral context by specifying exactly what data is returned (fields, geometry type, record count, capabilities), which goes beyond the annotations. However, it does not mention potential network latency or rate limits for external URLs.

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 conveys the action, target, and key output components without unnecessary words or repetition. Every part of the 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?

With a single parameter, strong annotations, and no output schema, the description fully covers what the agent needs to know: inputs (url) and outputs (fields, geometry type, record count, capabilities). It is complete for an information retrieval 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?

Schema coverage is 100% and the url parameter already has a clear description with an example. The tool description only restates 'by url' without adding new parameter semantics. Thus, the description adds no value beyond the schema.

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 a specific verb ('Get') and clearly identifies the resource (ArcGIS Feature/Map Service layer's schema) and the scope (fields, geometry type, record count, capabilities). It distinguishes itself from sibling tools like query_layer by focusing on metadata retrieval rather than data queries.

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 implies the tool is for retrieving schema/metadata via URL, but it does not explicitly state when to use this tool versus alternatives like query_layer or search_within. No exclusions or alternative references are provided, so usage context is implied rather than explicit.

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