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

Goes well past the annotations: discloses sanitisation rules (no scripts, styles, frames or forms), content moderation, noindex serving, the 7-day expiry, pricing at $0.01/call via x402 or a card key, and that failed calls are free. It also explains why repeats cost money, which gives concrete meaning to idempotentHint=false.

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?

Front-loads the action, limits and return value before the usage guidance and pricing. It is a dense single paragraph, but every clause carries information an agent needs; only the pricing sentence is slightly over-packed.

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 three-parameter tool with no output schema, the description covers the return value (a public URL), its lifetime, the content constraints, and the cost model. Nothing an agent needs in order to call it correctly is missing.

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 the schema already documents html, title and days with defaults and ranges. The description restates the 200,000-character limit and the 7-day validity but adds no format or syntax detail beyond what the schema supplies.

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 and resource ('Host a static web page'), names the inputs and the output ('a public URL at once'), and gives the lifetime. It never mentions the near-identical sibling page_publish, so an agent cannot tell the two apart from the description alone.

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 concrete use cases: handing a person a report, dashboard or summary, or sharing results between agents. It does not state when not to use it or name page_publish as the alternative, which is the main routing gap for this tool.

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