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

Annotations already declare idempotentHint=true, destructiveHint=false, and openWorldHint=false, so the description's job is lighter. It does add value by stating the webhook must be https and that it is triggered by band changes, but it never says whether an existing webhook is overwritten or whether only one webhook can exist at a time.

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 front-loaded sentence with no wasted words; the action and trigger are stated immediately.

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 two-parameter, non-destructive, idempotent mutation with no output schema, the definition is minimally adequate but leaves open whether a prior webhook is replaced and what the call returns or errors on.

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 only 50%: 'key' is documented in the schema while 'webhook_url' is a bare string, and the description partially compensates by implying the URL must be https. The description adds no detail on the key parameter's role given the schema already covers the header alternative.

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?

Clear verb+resource: 'Add or change the https webhook notified on band changes' tells the agent exactly what is being configured and the event it fires on. It is not confused with the sibling key/score tools, though it never explicitly differentiates itself from them.

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?

'Add or change' implies both create and update usage, but there is no explicit statement of when to use this versus alternatives (there are none listed), nor any prerequisites such as needing an existing key.

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