clinical_trials_enums

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

Annotations already declare readOnlyHint=true, indicating a safe read operation. The description adds that it returns every enum type with all valid values, which is some behavioral context but does not cover output format or pagination. Thus it adds moderate value beyond annotations.

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 two sentences: first states the action, second describes the return content and usage. No fluff, front-loaded with the core purpose, and every sentence earns 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 simple read-only enumeration tool with an optional filter, the description is mostly sufficient. It clearly communicates what is returned and when to use it. It does not describe the exact output structure, but given the low complexity and good schema coverage, this is a minor gap.

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%: the enum_type parameter is fully described in the schema. The description mentions example enum types (Status, Phase, StudyType, InterventionType) that align with the schema values, but does not add new semantics beyond what the schema provides. Baseline 3 is appropriate.

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 explicitly states 'List all valid enum values for ClinicalTrials.gov data fields', with a specific verb and resource. It distinguishes itself from siblings by focusing on enum types (Status, Phase, etc.) and clarifies it returns all valid values, which is unambiguous.

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?

Provides clear context: 'Use as a reference when building search filters or understanding field values.' This tells when to use the tool, but does not mention exclusions or alternatives (e.g., clinical_trials_field_values), so it lacks explicit when-not guidance.

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