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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is covered without description help. The description adds that results carry file status and metadata, which is useful context beyond the annotations, but it says nothing about result volume, pagination behavior, or how status values should be interpreted.

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?

A single front-loaded sentence with the verb first and zero filler or repetition. It is appropriately sized, though it leaves little room for the usage routing an agent would benefit from.

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 paginated read tool with full schema coverage and rich annotations, the description is adequate but thin. It does not mention pagination expectations or what the returned status/metadata fields represent, which an agent would need to interpret results without an output schema.

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%, with limit, offset, and datastoreId each documented in the schema including defaults. The description adds no additional meaning about filtering, ordering, or the significance of datastoreId, so the baseline 3 applies.

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 states a specific verb ("List") and a specific resource ("files in a Business Context datastore") plus what comes back ("status and metadata"), so an agent can tell it enumerates files rather than fetching a single document. It does not explicitly distinguish itself from near-siblings such as datastore_get_document, datastore_get_chunks, or datastore_query, which keeps it below 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?

There is no explicit when-to-use guidance and no named alternative. An agent must infer that this is the enumeration path and that datastore_get_document or datastore_query are the choices for single-item retrieval or searching, which is left entirely to inference.

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