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

Annotations already indicate read-only, idempotent, and non-destructive behavior, so the description only needs to add context beyond those. It does by restricting the URL to a specific domain, naming the output formats, and stating the 40,000-character cap. It does not specify what happens over the limit, but annotations lower the bar for safety-related behavior.

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?

The description is a single, front-loaded sentence with no filler. It states the action, the resource scope, the output form, and the size limit, with every clause earning its place.

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 one-parameter read tool with no output schema, the description covers the essential details: what to pass, what domain is allowed, what format comes back, and the result size limit. It is slightly incomplete about how the Markdown vs stripped-text mode is chosen and about truncation behavior, but overall it gives enough to call the tool correctly.

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?

The schema only says 'url' is a string with format 'uri', which is minimal. The description adds important meaning by requiring the URL to be an https://sign.blacklabeltec.com page, effectively constraining the single parameter beyond the schema. It does not fully explain URL edge cases, but it compensates reasonably for the 0% schema coverage.

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 clearly states a specific action—reading one web page—along with the exact domain, output format, and character limit. It is easy to distinguish from search_pages and site_info because it says 'one page' and describes page-content retrieval rather than searching or site-level metadata.

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 gives no explicit guidance about when to choose read_page over search_pages or site_info. It does not mention alternatives, prerequisites, or when not to use this tool, leaving the agent to infer usage solely from the tool name and description.

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