watchlist_test

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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true. The description adds value beyond them by disclosing that the event is signed and by stating the rate limit ('5 a minute'), which an agent needs to avoid throttling. It could say more about effects on the alert's real state, but it is solid.

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 compact sentence with the action front-loaded and the two most actionable facts (signed sample, rate limit) trailing. Every clause earns its place; nothing is padded.

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 action tool with no output schema, the description covers what it does, when to use it, and its rate limit. It does not describe what the test returns or whether the sample is recorded in deliveries, but no output schema exists to require that.

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 100% and there is a single parameter, so the schema already documents the id fully. The phrase 'the alert's webhook' loosely ties the id to a watchlist/alert, but adds no syntax or format detail beyond the schema. 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?

The description states a specific verb and resource: 'Send a signed sample event to the alert's webhook now.' This clearly distinguishes it from siblings like watchlist_get, watchlist_create, and watchlist_deliveries without needing to open any schema.

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 gives clear context for use: 'to build and verify the receiver,' implying it is a setup/verification action rather than a production send. It does not explicitly name alternatives or state when not to use it, but the intended moment is unambiguous.

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