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

Annotations already cover readOnly/destructive/openWorld, but the description adds genuine behavioral value beyond them: it discloses the conditional return field panel_url and the condition under which it appears ('when the guide names the screen'). This matters because there is no output schema. It says nothing about behavior when the URL is invalid or not a guide, which limits it to a 4.

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 sentences with zero filler; the identity of the resource and its source tool come first, followed by the useful return-field note. Every clause carries information.

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-only tool with no output schema, the definition covers what it reads, where the input comes from, and the one non-obvious response field. Nothing an agent needs in order to invoke 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 baseline is 3, but the description adds a concrete URL format example (https://ajuda.all4clinic.com.br/agenda/agendar) that clarifies what a valid link looks like beyond the schema's 'link returned by search_help'.

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?

Specific verb+resource ('Read the full text of one All4Clinic help guide') with an explicit scope of 'one' guide. It names the sibling search_help as the origin of the input, so the agent can tell it apart from list_help_topics and get_faq.

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 phrase 'given its link from search_help' establishes the prerequisite workflow node and indirectly excludes direct use without a search result. It stops short of stating when NOT to use it (e.g. browsing topics via list_help_topics or answering from get_faq), so no explicit exclusion is given.

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