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

Annotations already declare readOnly/idempotent/openWorld/non-destructive, so the description correctly spends its words elsewhere: it discloses the return format (full markdown), that links inside the content can be followed for navigation, and that it returns the complete page rather than a snippet. No rate limits or failure modes (e.g. behavior on a non-doc URL) are mentioned, which keeps it just short of a 5.

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?

Four short sentences, front-loaded with the core action, followed by the usage condition, the sibling distinction, and the return shape. Every sentence carries distinct information with no repetition.

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 single-parameter read tool with no output schema, the description covers what it returns (full markdown, links), how to obtain the input (full page URL, with example), and when to prefer the sibling. Nothing material 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% and already documents `url` as 'The URL of the page to fetch'. The description adds genuine meaning beyond that: it accepts full URLs and supplies a concrete example format (https://mariadb.com/docs/getting-started).

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 ('Fetch the full markdown content of a specific documentation page from MariaDB Documentation') and explicitly contrasts with the sibling `searchDocumentation`'s partial results. An agent can distinguish it from siblings without opening the 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?

Gives an explicit trigger ('when you have a page URL and want to read its content') and an explicit alternative ('Since searchDocumentation returns partial content, use getPage to retrieve the complete page when you need more details'). That is a clean when/when-else routing rule.

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