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

Annotations already declare readOnlyHint=true, openWorldHint=true and destructiveHint=false, and the description adds nothing beyond restating the GET endpoint. No word on permissions, error behavior, or what a missing id yields.

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 short fragments with zero filler and the resource front-loaded. It is efficient, though the telegraphic style omits a verb that would make it read more naturally.

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 trivial single-parameter lookup this is minimally adequate, but there is no output schema and the description says nothing about the returned field shape. Annotations cover the safety profile, so the gap is modest rather than severe.

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 100% for the single data_field_id parameter, so the schema already carries the semantics. The description's 'by id' adds only marginal reinforcement, which is the baseline 3 case.

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 resource (a single data field) and scope (by id), which is enough for an agent to understand it retrieves one record. It does not explicitly contrast itself with the sibling waitwhile_list_data_fields, so it falls short of a 5.

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?

No when-to-use guidance, no prerequisites, and no statement of when the list variant is preferable. The agent must infer that this is for fetching one field when its id is already known.

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