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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so the safety profile is covered. The description adds useful context about returned device fields and the GET /devices endpoint, but does not discuss pagination behavior, rate limits, or response semantics beyond field names.

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?

Two sentences, front-loaded with the operation and returned data, followed by filtering behavior and the endpoint. There is no filler, and every sentence contributes to invocation.

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?

The description covers device categories, returned attributes, and core filtering, which is important because there is no output schema. Pagination and sorting are left entirely to the schema, but they are well documented there, so the definition is nearly complete for correct use.

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 100%, so the six parameters are already fully documented, including pagination, sorting, and type enums. The description reinforces that type and location filters exist, but adds no syntax or meaning 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 states a specific verb and resource ("List devices") and enumerates the device categories and returned fields, making the scope clear. It implicitly distinguishes list from sibling get_device by verb, but does not explicitly name alternatives or boundaries.

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?

It tells the agent that results can be filtered by type or location, which implies typical usage. However, it does not say when to choose this over get_device or list_locations, nor does it state prerequisites or exclusions.

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