Reddit User

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

Annotations already carry the safety profile (readOnlyHint, idempotentHint, non-destructive), so the bar is lowered. The description adds useful context by scoping to 'public' data only, but discloses nothing about rate limits, handling of non-existent/usernames with wrong case, or response behavior. No contradiction with 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?

A single ten-word sentence that front-loads verb and resource, then adds scoping ('public') and concrete field examples. Every word earns its place with zero filler or redundancy.

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 single-parameter, read-only tool with rich annotations (read-only, idempotent, non-destructive) and an existing output schema, the description covers the essentials: what is fetched, the data scope, and example fields. It would be more complete with a routing note toward reddit_user_posts, but the tool's low complexity keeps this gap minor.

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 0%, so the description must compensate. It does so only indirectly: the tool name, title, and description make the 'username' parameter's purpose self-evident as the Reddit account whose profile metadata is fetched, but no explicit parameter-level guidance is added.

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 states a specific verb+resource ('Get public Reddit profile metadata') and enumerates the specific fields returned (account age, karma, mod status). This clearly differentiates it from close siblings like reddit_user_posts (posts vs. profile metadata) and other user-lookup tools, so an agent can select it correctly without opening the schema.

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 guidance is given on when to use this tool versus alternatives. It does not mention that reddit_user_posts should be used for post history, nor state any conditions or exclusions. Usage context is only implied by the name/description, not explicitly conveyed.

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