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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered structurally. The description adds useful domain context (datafiles are CDN-served published JSON for page hydration), but says nothing about pagination behavior, result ordering, or what's omitted when unpublished — gaps the annotations don't fill.

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 sentences, zero waste, with the operation and scope front-loaded and the resource definition following immediately. Nothing is repeated from the title or annotations.

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?

With full annotation coverage and an output schema, the description needn't explain safety or return shape, and the datafile definition closes the conceptual gap. The only shortfall is the absence of when-to-use routing among many list_* siblings, which is the one thing structured fields can't supply.

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%, and the schema's own descriptions (especially the detailed slug_prefix segment-matching note and include_total semantics) are unusually rich, so the schema carries the full parameter burden. The description contributes nothing about any of the four parameters, which is acceptable but not additive — baseline 3.

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 (List) and resource (datafiles) and scopes it to the authenticated tenant, and the second sentence defines what a datafile actually is. The 'list' vs 'get_datafile' distinction is inferable from the verb, but no sibling is named explicitly, keeping it at 4 rather than 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?

There is no guidance on when to use this versus get_datafile, list_assets, or any other sibling, and no mention of the pagination/folder-prefix workflow that governs how you'd actually page through results. The tenant scoping is the only contextual signal, so usage is left to inference.

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