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

Annotations already declare readOnlyHint=true and destructiveHint=false. The description adds value by specifying what behavior to expect: it returns authenticated user details and associated account information, including account status, enabled channels, and plan. This explains the read-only scope without repeating annotation values.

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 compact and front-loaded with a one-sentence summary. The USE FOR list is helpful, though the final sentence slightly overlaps with the opening summary ('Current user and account information' vs. 'Returns authenticated user details and associated account information'), making it less crisp than it could be.

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 no-parameter read-only getter with no output schema, the description adequately explains what the tool returns: authenticated user details, account status, channels, and plan. It does not detail exact response fields or note that no parameters are required, but the schema covers the parameter aspect and the tool is simple enough that this is sufficient.

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 and schema description coverage is 100%, so the schema fully documents the empty parameter set. With no parameters to explain, the description does not need to add parameter meaning. The baseline of 4 applies here.

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 the tool returns current user and account information, with specific use-case questions like 'Which account am I using?' and 'What's my account name/status?'. It is distinguishable from sibling tools such as list_user_accounts, which handles account listings, though it does not explicitly contrast itself with those siblings.

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 'USE FOR' section provides concrete example queries that signal when this tool is appropriate, such as identifying the active account or checking subscription/plan. It does not explicitly mention when not to use it or name alternatives, but the context is clear enough for an agent to route to this tool correctly.

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