uselink_set_url_handle

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

With no annotations, the description carries the full burden. It discloses the timing requirement, input format constraints, and return value ('Returns the updated user'). However, it doesn't explicitly state whether the handle can be changed after being set, which could be a relevant behavioral detail, but the core behavior is well covered.

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?

Three sentences, all information-bearing: purpose, when to use, format, and return value. No redundancy or filler. Front-loaded with the primary action.

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 tool with no annotations or output schema, the description provides everything an agent needs: the action, the trigger condition, format validation details, and the return value. It is complete for the tool's complexity.

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% for the single parameter, including format details. The description restates the format but adds no new parameter-specific semantics beyond the schema, so the baseline score of 3 is appropriate.

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 'Set the user's public URL handle' with a specific verb and resource. It distinguishes itself from sibling tools by focusing on the user handle, and the additional context about being required before first publish and the USERNAME_REQUIRED error makes its purpose unambiguous.

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?

Explicitly says 'Required once before publishing the first document' and 'Call this when publish returns USERNAME_REQUIRED', giving clear when-to-use guidance. Although it doesn't mention alternatives, no sibling tool performs this exact function, so the instruction is sufficient.

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