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

Annotations already declare readOnly, idempotent, non-destructive, closed-world lookups, so the safety profile is covered. The description adds genuinely new behavioral information: the closed set of five possible status outcomes plus an accompanying explanation, which is important for an agent interpreting results since there is no output schema.

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 action and followed by the outcome vocabulary; every clause earns its place, including the illustrative device names. Minor slack in the trailing 'with an explanation', which is slightly vague about what the explanation contains.

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 one-parameter, no-output-schema lookup, the description covers input semantics and return values, which is nearly everything an agent needs. The remaining gap is ambiguity handling — how the tool behaves with a misspelled or unsupported device name beyond returning 'unknown'.

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 0% and the single 'device' parameter is an untyped string with only maxLength, so the description must carry the meaning — and it does, clarifying that the value is the device as the user names it, with concrete examples. It still doesn't say how loose matching is or what to do with an unrecognized name (beyond the 'unknown' return).

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+resource ('Check whether a device ... works with Screenbird') and enumerates the exact outcome vocabulary (works, coming_soon, does_not_work, works_in_browser, unknown). This clearly separates it from siblings like get_install_steps or search_help, which are about setup and documentation rather than compatibility lookup.

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?

Gives clear triggering context — a user-nameable device such as "Samsung TV", "Chromecast", "iPad" — which tells the agent when this tool applies. It stops short of naming an alternative or exclusion (e.g. when to prefer get_install_steps or search_help instead), so it is clear but not fully routing.

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