client_setDisplayName

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

The description explains the effect of the display name (shown to users who haven't added you as a contact), which is useful context. But it does not disclose that the schema includes picture parameters, nor any side effects, return values, or session requirements. With no annotations, the description carries the full burden and falls short.

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 brief (two sentences) and front-loaded with a category tag, but the first sentence is vague and arguably redundant with the second. It is concise but not maximally informative, and the content could be clearer.

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?

The description explains the purpose at a high level but fails to reconcile the schema's picture parameters with the display name concept. There is no output schema, no annotations, and no details about the required sessionId or how the picture is used. This is incomplete for a tool with 3 parameters and a confusing parameter set.

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 schema has 100% coverage for its parameters, but the description's emphasis on 'name' conflicts with the actual picture-related parameters (pictureData, pictureMimetype). The description does not add any parameter clarity and actively misleads by implying a name parameter that does not exist.

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 says 'Set the current user' which is vague, but the second sentence clarifies it sets the display name. However, the schema parameters (pictureData, pictureMimetype) suggest it actually sets a profile picture, creating a conflicting purpose. The tool name 'setDisplayName' does not align with the schema, making the stated purpose misleading.

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 provided on when to use this tool versus alternatives. There are siblings like client_setProfilePicture and client_setStatus, but the description does not differentiate or mention when this tool should be preferred.

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