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 covered. The description adds value beyond that by confirming the operation is read-only and explicitly noting that upload/delete are not available as tools and must go through the REST API — a non-obvious routing fact an agent would otherwise have to guess.

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?

Three short sentences, zero waste: resource and returned fields first, then the use case, then the read-only/mutation boundary. Every sentence carries distinct information.

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 no output schema, the description compensates by enumerating the returned fields, and it clarifies scope and the mutation boundary. Minor gap: nothing is said about result volume, ordering, or whether the list is paginated, which matters for an org-wide listing.

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?

The tool takes zero parameters, so the baseline is 4. The description correctly implies no filtering or scoping arguments are needed, listing everything in the organization, which is consistent with the empty object schema.

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 ('List the files saved in the organization') and enumerates the returned attributes (id, name, size, content type, creation time). None of the sibling tools touch files, so there is no ambiguity to resolve, and the scope (organization-wide) is explicit.

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?

Explains the downstream use case ('Reference a file by id in a run's or workflow's files'), which tells the agent why and when to call it. It also names the alternative path for mutation ('upload and delete files through the REST API'), effectively excluding this tool from write scenarios, though it does not call out a specific sibling tool for comparison.

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