update_fictional_user

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

The description adds no behavioral information beyond the annotations. Annotations indicate readOnlyHint=false and destructiveHint=false, but the description does not clarify side effects, the uniqueness constraint (which is only noted in the schema's email parameter), or the effect of omitting optional parameters. It fails to indicate that this is a non-destructive write operation that requires an existing user.

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 extremely short at five words, but it is under-specified rather than concise. It repeats the tool name and provides no meaningful content, so it does not earn its place as an informative description. The low information density makes it inadequate.

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 an update operation with 6 parameters and no output schema, the description should at least indicate that it modifies an existing fictional user and that required fields must be provided. It does not mention the email uniqueness constraint, the need for fictional_user_id, or any behavioral expectations. The description is too sparse to be contextually complete.

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 83% (5 of 6 parameters documented in the schema). The tool description does not elaborate on any parameters, so it adds no value beyond the schema. Per the baseline for high schema coverage, a score of 3 is appropriate, but the description itself is unhelpful.

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 'Update a fictional User' simply restates the tool name, making it a tautology. It does not provide any additional specification or distinguish this update tool from the many other update_* siblings beyond the resource name. This offers no new information to an agent.

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 provides no guidance on when to use this tool versus alternatives such as create_fictional_user or delete_fictional_user. It does not mention that the fictional user must already exist, nor any prerequisites or exclusions. There is no context for selection.

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