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

Annotations cover non-read-only, non-destructive, non-idempotent, open-world. The description adds placement behavior (append at end) and implicitly no return info. With annotations, the bar is lower; the description adds the append-at-end detail, which is useful.

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 sentence, front-loaded with verb and resource, and includes the placement scope. No waste.

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 creation tool with full schema coverage and annotations, the description is adequate but lacks guidance on when to use it vs update_link or how group_id interacts with page placement. Output schema absent, but return values are simple enough.

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 coverage is 100%, so parameters are well documented. The description only clarifies that group_id placement is optional by saying 'or at the end of one of its groups'. Baseline 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?

States a specific verb ('Adds') and resource ('a link') and clarifies placement ('at the end of the creator's page, or at the end of one of its groups'). Distinguishes from update_link/archive_link by implying creation, but doesn't explicitly name siblings.

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 explicit when-to-use vs alternatives; the agent must infer from sibling names. The placement clause gives some context but not a rule for choosing group_id vs page-level.

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