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

Annotations already declare readOnly, idempotent, open-world, non-destructive, so the safety profile is covered. The description adds genuinely useful context beyond that: paid keys unlock extra senses, and the `ok` field has a narrowly scoped meaning that should not be read as content validation. It omits error/timeout behavior and what happens with unpaid keys on media targets.

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?

Two dense sentences with the capability list front-loaded and the `verify` caveat at the end. Every clause carries information, though the compressed 'sight, or hearing for media' phrasing is slightly opaque on first read.

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?

Without an output schema, the description does a good job naming the readings an agent will receive and scoping what `ok` means. The main remaining gap is what the paid-tier 'sight/hearing' output actually looks like and how failures are surfaced.

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 100%, so both `intent` and `target` are documented in the schema, including that intent is recorded but not judged. The description adds no parameter-level detail beyond that baseline, which is acceptable when the schema carries the load.

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 concretely enumerates what the tool returns (up/down, speed, security headers, content excerpt) and notes that paid keys add sight or hearing for media, which implicitly separates it from the see/hear siblings. It also names `verify` as the different tool for content claims. It stops short of explicitly contrasting with `read`, `see`, `hear`, and `senses`, so an agent must infer the boundary.

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?

Gives a clear exclusion: `ok` covers only the readings and does NOT check content claims, so use `verify` instead. That is a real routing rule. It does not say when to prefer perceive over see/hear/read directly, which leaves part of the sibling selection to inference.

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