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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered. The description adds genuinely useful context beyond that: 'Past results are kept' clarifies the blast radius of the destructive operation, and the id source hint is an extra. It doesn't cover reversibility or permission requirements.

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?

One compact sentence plus a short clause; the core action is front-loaded and there is no wasted wording.

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-param destructive mutation with no output schema and zero schema descriptions, the description handles the id source and retention behavior but leaves profile_id and permission/error behavior undocumented. Adequate but with clear gaps.

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 the full burden. It explains url_id's origin (get_voice_monitor) but says nothing about profile_id, leaving one of two required UUIDs completely opaque.

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?

States a specific verb+resource ('Stop watching a page') with a clear scope, and the implicit contrast with the sibling add_monitor_url is easy to infer. It stops short of naming the sibling outright, so it lands at clear-but-undifferentiated rather than a top score.

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 description implies usage by telling the agent where the id comes from ('url id from get_voice_monitor'), which is real precondition context. However, it offers no explicit when-to-use/when-not or fallback guidance beyond that single hint.

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