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

No annotations are provided, so the description carries the burden. 'Get details' implies a read-only operation, and 'authenticated' signals an auth requirement. However, the description does not explicitly state that there are no side effects, nor does it describe what fields will be returned.

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 concise sentences, front-loaded with the core purpose and followed by useful usage guidance. It contains no filler or redundant 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?

For a zero-parameter read-only tool, the description gives enough context for selection and invocation. However, there is no output schema and the description does not specify what 'details' includes, so an agent may not know what to expect in the response.

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 input schema has zero parameters and 100% schema coverage, so there is nothing for the description to add about parameter semantics. The baseline for zero-parameter tools is 4, and the description correctly avoids inventing unnecessary parameter details.

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 and resource: 'Get details of the authenticated GitHub user.' This clearly distinguishes the tool from sibling tools like github_readonly.get_file_contents and github_readonly.pull_request_read, which focus on files and pull requests rather than the user's own profile.

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 explicitly states when to use the tool: when a request concerns the user's own GitHub profile, or when information is missing to construct other tool calls. It does not explicitly name alternatives or exclusion conditions, but the given context is sufficiently clear for this simple tool.

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