umouse_list_devices

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

No annotations are provided, so the description carries the full burden. It does disclose the returned fields and their meaning — connMode (USB/BLE), battery (%), status (normal/meeting), lastSeen — which is real behavioral value, but it never says whether the call is read-only, whether it blocks, what happens when zero devices are online, or whether it triggers a scan.

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?

A single sentence with the resource stated first and the return shape appended as a bracketed field list — zero filler and well front-loaded. The bracket notation is slightly terse/cryptic, but every element 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 zero parameters and no output schema, the description correctly compensates by inlining the return structure and field meanings. What remains unstated is edge-case behavior (empty result, freshness of 'online', ordering), which is a minor gap for a no-arg list 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 tool takes no parameters and the schema is empty, so there is nothing for the description to disambiguate; baseline 4 applies. The description's field list describes output rather than input semantics, so it neither helps nor hurts here.

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 (enumerate/枚举) and a specific resource (currently online Shengyun smart mice), and the bracketed field list makes the payload concrete. It does not name a sibling or contrast with umouse_status / umouse_get_capabilities, which also expose device-level information, so an agent must infer the difference.

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 only implied: listing online devices is the natural first step before device-specific calls. There is no explicit when-to-use, no when-not-to-use, and no mention of the similarly scoped umouse_status or umouse_get_capabilities, leaving sibling selection to inference.

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