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

Goes well past the annotations (which only declare read-only/idempotent safety) by disclosing that output is freeform and shape-dependent on the Twig definition, and by disclosing the hard 50-item cap plus the truncation hint. Those are exactly the behaviors an agent needs and cannot infer from structured fields.

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?

Four tight sentences, each doing distinct work: purpose, output shape, prerequisite, and truncation/routing. The cap and the fallback to query_view are front-loaded before any incidental detail.

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?

Although an output schema exists, the description correctly warns that the return shape is effectively freeform and view-dependent, plus it covers truncation and the prerequisite call. Nothing an agent needs to invoke this 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 100%, so the baseline is 3; the description confirms the 'by id' lookup but adds no syntax or format guidance for params. The schema itself already documents format and locale as no-effect forward-compat fields, so the description's silence is acceptable but not additive.

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 verb and resource: 'Fetch a data view's full cached result by id'. The 'full cached result' phrasing contrasts with the per-item paginated access of query_view, so the agent can separate the two siblings without reading schemas.

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?

Gives explicit sequencing ('Call describe_view first to learn the expected shape') and an explicit alternative with its selecting condition ('For per-item paginated access use query_view directly'). Both when-to-use and when-to-use-something-else are covered.

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