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

Annotations already declare idempotent=true and destructiveHint=false. The description adds meaningful behavioral context by stating that this is a replacement operation and that an empty list detaches all destinations, which is important for an agent to know.

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 description is three short sentences with no wasted language. The main replacement behavior is front-loaded, followed by the id source and the empty-list edge case.

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 simple two-parameter mutation with annotations and no output schema, the description covers the core replace semantics and empty-list behavior. However, it leaves the required slug parameter unexplained and does not describe the response or confirmation behavior.

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 0%, so the description must carry parameter meaning. It explains destination_ids well, including that ids should come from list_alert_destinations and that an empty array detaches all, but it says nothing about the required slug parameter or its expected format.

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 uses a specific verb, 'Replace', and a precise resource, 'alert destinations attached to a status page'. It also names the related list_alert_destinations tool, making the write-versus-read distinction clear.

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 explicitly tells the agent to use list_alert_destinations to obtain destination ids and explains that an empty list detaches all destinations. It does not discuss prerequisites or alternatives such as update_status_page, but the intended usage is clear.

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