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

The openWorldHint annotation signals potential external effects, and the description specifies the actual external side effect: sending a notification. It also adds auth and plan requirements. While it doesn't mention rate limits or whether channel configuration is modified, the description meaningfully extends beyond the annotation by naming the precise behavior.

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 with no filler. The action is front-loaded, and the prerequisite condition is stated compactly in the second sentence. Every word adds value, and the entire tool behavior fits in a tight, readable format.

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 single-parameter tool with a straightforward side effect, the description covers the essential operational context: what it does and what's required to call it. The absence of an output schema is a minor gap since a 'test' tool likely returns a success/failure indicator, but this doesn't materially impede correct invocation.

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%, with channel_id already fully documented as 'The ID of the notification channel to test.' The description adds no additional meaning about the parameter, so it appropriately leaves parameter semantics to the schema. Baseline 3 is correct 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?

The description states a specific action ('Send a test notification') with a clear resource ('through a configured notification channel'), immediately distinguishing it from sibling tools like create-notification-channel or disable-notification-channel. The 'test' modifier clarifies its diagnostic nature, so an agent can tell it apart without opening the 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?

The description mentions prerequisites (Full Access MCP token, eligible paid plan) but provides no explicit guidance on when to use this tool versus alternatives. It doesn't state that it should be used after creating a channel or before enabling it, nor does it exclude scenarios. The usage context is only weakly implied by the word 'test'.

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