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

Annotations already declare readOnlyHint, idempotentHint, and openWorldHint=false, so the safety profile is covered. The description's one useful addition is the required storage:read scope, which tells the agent what permission must be present. It says nothing about pagination, defaults, or what a page contains, so it does not go far beyond the 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?

Two short fragments with no filler and the resource stated first. The terseness is efficient rather than padded, though the lack of a verb phrase makes it feel like a label more than a description.

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?

There is no output schema, so the description is the only place return values, page shape, and next_cursor semantics could be explained, and it says nothing about them. For a paginated list tool with five optional parameters, this leaves the agent to infer the response structure entirely.

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 coverage is 100% and each of the five optional parameters has its own description, including defaults and the cursor convention, so the schema carries the meaning. The description only echoes 'on a branch' without adding format or interaction detail, so 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?

'Storage buckets on a branch' identifies the resource and scope, but it is a noun fragment with no verb, so the listing action is only inferred from the tool name. It also does not distinguish this tool from the sibling storage.buckets.create.

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 'Scope: storage:read' note is the only guidance, and it is an authorization scope rather than a when-to-use rule. There is no statement of when to pick this over storage.buckets.create or when listing is the wrong call.

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