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

The annotations already declare readOnly, idempotent, non-destructive and closed-world, so the safety profile is fully covered. The description adds useful substance beyond them by disclosing the payload shape: step-by-step guide, red flags, and links to official consumer resources, which matters because there is no output schema.

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, front-loaded with what the tool returns and followed by when to call it. Every clause carries information (the four topics, the three content types, the three trigger scenarios) with no filler.

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-optional-enum, read-only lookup with no output schema, the description supplies both the return content and the usage triggers across all four topics. Nothing an agent needs in order to select and 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 description coverage is 0%, so the description carries the burden for the single 'topic' parameter, and it does so by mapping each enum value to an intent: overview for reading an EOB, dispute for a wrong bill, appeal for a denial, glossary for arithmetic-driving terms. The mapping is conveyed implicitly through parallel parenthetical ordering rather than by naming the parameter, and the default of 'overview' is never mentioned.

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 names a specific verb and resource ('Returns KeepMD's step-by-step guide, red flags and links') and enumerates the four content areas it covers, so an agent knows exactly what comes back. It stops short of explicitly differentiating itself from the sibling explain_insurance_term, which the 'glossary' topic partially overlaps with.

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 second sentence gives concrete triggering conditions: how to read an EOB, what to do about a wrong bill, how to appeal a denial. That is clear when-to-use guidance. It names no alternatives or exclusions, so an agent facing a term-definition question has no signal for choosing this over explain_insurance_term.

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