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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states that a watch is deleted by client_key, but does not mention that the deletion is permanent, what happens to associated data, or whether the operation is idempotent. This leaves the agent unaware of important destructive side effects.

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 a single sentence, concise and front-loaded with the core action. It avoids any filler. However, it is so brief that additional relevant details (e.g., api_key purpose) could be included without harming conciseness, so it earns a 4 rather than a 5.

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?

The tool is simple, and an output schema exists, so return values need not be explained. However, the description lacks critical context: it does not explain the api_key parameter, does not indicate that deletion is irreversible, and provides no usage guidance. Given the moderate complexity of two parameters and a destructive action, the description is incomplete.

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 compensate for explaining the parameters. It explicitly explains client_key as the watch identifier, but api_key is left completely unexplained. Since one of the two parameters is undocumented, the parameter semantics are only partially addressed.

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 clearly states the action (Delete) and the resource (watches) using the client_key as the identifier. It is specific and unambiguous, and it naturally distinguishes from sibling tools like list_watches and set_watch by the delete verb.

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?

No guidance is given on when to use this tool versus alternatives. There is no mention of prerequisites, such as needing the client_key from list_watches, nor any conditions under which deletion is appropriate. The description simply states the action without contextual cues.

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