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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, fully covering the safe non-mutating profile. The description adds the semantic nuance that results reflect 'currently permitted' access, but no deeper behavioral traits are disclosed. There is no contradiction with annotations.

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?

The description is a single front-loaded sentence with no filler or repetition of the title or schema. Every word contributes to stating what the tool returns.

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?

The tool is simple, has an output schema, fully documented parameters, and annotation-covered safety behavior. The only minor gap is that 'buckets' is plural while the required bucket_name implies this tool likely reports permissions for a single named bucket, which could be slightly clearer.

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 both bucket_name and bucket_token already explained in the schema. The description does not add parameter syntax or role details beyond that, so the baseline score of 3 is appropriate.

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 uses a specific verb, 'Return', and clearly identifies the resource: currently permitted buckets and operations. This distinguishes it from sibling tools like get_bucket (which likely returns bucket metadata) and the mutation-oriented tools such as create_bucket and delete_object.

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?

The usage context is implied: this tool is for checking which buckets and operations are permitted. However, the description does not explicitly contrast it with alternatives like get_bucket, nor does it state when not to use it. The guidance is adequate but left to inference.

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