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 still adds real value by spelling out the state fields returned (connectivity, battery, auto-lock settings), which the annotations say nothing about. It stops short of mentioning error/not-found behavior or freshness of state.

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 compact clauses — resource/scope and returned-state inventory — followed by the endpoint path. Front-loaded with the resource, zero filler, nothing repeated from the title.

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?

There is no output schema, so the description carries the burden of describing the return value — and it does so concretely by listing the state categories. Combined with complete parameter documentation and read-only annotations, an agent has everything needed to call this correctly.

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?

With a single parameter at 100% schema coverage and a schema description naming it a RemoteLock device UUID, the schema does the heavy lifting. The description only echoes 'by id' and adds no format, sourcing, or validation detail beyond the schema, so baseline 3 applies.

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?

States a specific verb ('get') and resource ('one device (lock) by id') and then enumerates exactly what the response contains: connectivity, battery/power, lock state, auto-lock settings, model, location. This clearly separates it from list_devices and the mutation siblings (lock_device/unlock_device).

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?

Usage is implied — fetch a single lock when you already have its id — but there is no explicit guidance on when to prefer this over remotelock_list_devices for discovering ids, and no note about what happens with an unknown id. Adequate but with a clear gap.

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