Send a test notification; returns the delivery (null when deduplicated)

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

Beyond the readOnlyHint=false/openWorldHint=true annotations, it discloses that the call is gated behind confirm:true, that there is no server-side dry run, and that the return is a delivery object or null when deduplicated. That is meaningful write-path and return-shape context an agent cannot get from the annotations alone.

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 compact sentences, front-loaded with what the tool does and its return value, followed by the write-safety constraint. The endpoint path is a useful anchor and nothing is wasted.

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 three-parameter write tool with no output schema, the description covers the safety gate, the absence of a dry run, and the return semantics including the null/deduplicated case. Only the identity of the required id parameter and idempotency behavior are left implicit.

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 67%, and the schema already documents confirm and idempotencyKey, so most parameter meaning is structured. The description reinforces the confirm gate but says nothing about the required id path parameter or the deduplication role of idempotencyKey, so it adds only marginal value over the schema.

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 ('Send a test notification') plus the underlying endpoint POST /v1/notification-channels/{id}/test, which pins down that it targets a single channel. It is clearly distinct from siblings like notifications_listChannels or notifications_retryDelivery, though it never names an alternative explicitly.

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 states a concrete precondition ('not executed unless confirm: true') and warns there is no server-side dry run, which is real usage guidance. However, it never says when to choose this over a real delivery retry (notifications_retryDelivery) or when a test is inappropriate, so the when-not side is left to inference.

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