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

The annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, and openWorldHint=false. The description adds useful context beyond that: it requires a Vault plan and that match confirmation happens outside the tool in the CrateWire app. It does not contradict any annotation.

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 purpose is front-loaded and the description is only three sentences. The sentence about period and scope largely repeats the schema enums, so not every sentence adds unique value, but overall it remains tight.

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, but the description outlines what the Radar returns and clarifies that confirming matches is out of scope. Combined with the annotations covering safety and the schema covering parameters, it is largely complete, with only minor missing detail around defaults and pagination.

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 schema already documents limit, scope, and period. The description repeats the period and scope enum values but adds no new semantics for limit, defaults, or formatting; it relies on the schema for parameter detail.

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 gives a specific verb and resource: 'Read this account's Radar', and explains what the Radar contains (watched artists/tracks, recent DJ plays, first-time plays). It distinguishes itself from the mutation siblings add_radar_watch and remove_radar_watch implicitly through 'Read', but does not explicitly route agents away from those siblings.

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 establishes clear usage context and includes a boundary: 'Confirming possible matches stays in the CrateWire app.' It does not explicitly say when to use this instead of add_radar_watch, remove_radar_watch, or get_my_feed, so it falls short of full when/when-not/alternatives guidance.

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