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

Annotations already declare readOnlyHint=false and idempotentHint=true, so repeat-delete safety and mutation status are covered structurally. The description adds one genuine behavioral detail beyond annotations – that future checks are cancelled – but omits whether deletion is permanent, whether gathered results are removed, and what the token requirement implies for authorization.

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 zero filler; the destructive action and its side effect 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?

An output schema exists, so return values need not be described, and annotations carry the safety profile. However, for a destructive two-parameter tool with 0% parameter coverage, the description leaves gaps around authorization (token), irreversibility, and whether previously collected data survives deletion.

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% and the description does not mention either parameter. Neither watch_id nor token is explained in prose, so an agent gets no semantic guidance on what identifier to supply or why a 64-hex token is required, despite the low schema coverage demanding compensation.

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?

Specific verb (delete) plus resource (previously created public-source watch) and even the consequence (cancel future checks). An agent can distinguish it immediately from source_watch_create, source_watch_check, and source_watch_status without opening any 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 phrase 'previously created' implies the watch must already exist, giving implied usage context, but there is no explicit when-to-use guidance, no mention of alternatives (e.g., source_watch_status to verify before deleting), and no stated prerequisites.

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