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

Annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered structurally. The description adds genuine value by disclosing the payload's shape (custom fields and statistics included), which matters since there is no output schema. It says nothing about behavior for unknown/invalid ids, auth requirements, or whether billing/notes data is included or requires separate calls.

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?

One short sentence that front-loads the resource and the distinguishing content of the response. No filler, no restatement of the name or title.

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 simple one-parameter read tool with full annotation coverage, an agent has enough to call it correctly and knows roughly what comes back. The remaining gap is disambiguation from find_user and the other per-user getters, which is a real risk in a 40-sibling namespace.

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% and the single parameter is documented well, including the accepted id formats and where the VibeAdmin id originates. The description adds no meaning beyond the schema, so the 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?

States a specific verb and resource ('Full details for one user') plus the notable payload contents (custom fields, statistics), so an agent knows this is a single-record fetch rather than a list. It does not differentiate itself from close siblings like find_user, get_user_activity, or get_user_billing, so the boundary is left to inference.

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?

No when-to-use guidance at all — nothing says to prefer this over find_user when you have an id, or over list_users when you don't. The only hint is the schema note that user_id may come 'from list_users', which implies a workflow but not an explicit rule.

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