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

Annotations already provide readOnlyHint and idempotentHint, and the description adds useful context by specifying that the result concerns what the OAuth user can act as. It also explicitly warns that no sharing changes occur, which reinforces the read-only behavior without contradicting 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?

The description is two short sentences with no filler. The read-only label is front-loaded, and the exclusion of sharing modifications is stated in a compact, clear way.

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 parameters omitted and an output schema present, the description does not need to explain return values or parameter syntax. It conveys the essential behavior and scope, making it complete for an agent to select and invoke this tool correctly.

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 has zero parameters)Skip and the schema covers all properties (none), so parameter semantics are not a burden. Description is not required to add parameter detail, and the baseline for zero-parameter tools 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 clearly states a specific verb and resource: it lists permissions and clarifies scope as 'who this OAuth user can act as.' It does not explicitly differentiate from sibling tools, but the sibling list contains no overlapping permission tools, so the purpose is unambiguous.

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 description gives clear context by labeling the operation read-only and explicitly noting that sharing is not granted or revoked here. While it names no alternative tool, none of the siblings perform permission management, so the usage guidance is adequate.

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