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

Annotations already declare readOnlyHint=false, destructiveHint=false, and idempotentHint=false, so the mutation/safety profile is covered. The description adds modest context: the link is public, performs a redirect, and is tied to a campaign. However, it does not disclose workflows implied by the schema, such as the confirmation_token flow or idempotency_key semantics, so it only partially supplements the 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 17-word sentence that is front-loaded with the core action ('Create a public short link') followed by scoping modifiers. There is no filler, redundancy, or structural waste; information gaps are real but belong to other dimensions.

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?

This is a write operation with 8 parameters and zero schema-level parameter descriptions, yet the description covers only a fraction of its semantics. The output schema covers return values, but the missing confirmation workflow, idempotency-key behavior, parameter explanations, and lack of differentiation from shortlink_rotate leave an agent under-equipped to invoke it correctly.

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, but it only alludes to destination_url ('destination') and campaign_id ('campaign'). The remaining six parameters—slug, project_id, utm_params, vanity_domain, idempotency_key, and confirmation_token—are unexplained in both the schema and the description, which is a significant gap in a 0%-coverage environment.

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 names a specific verb (create) and resource (public short link), plus the redirect-to-destination behavior and campaign scoping. It is clear but does not explicitly differentiate from its closest sibling, shortlink_rotate, so it stops short of a 5.

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 when-to-use or when-not-to-use guidance is provided. The description never mentions alternatives such as shortlink_rotate, nor any conditions for choosing this tool over a generic URL shortener. The 'selected campaign' phrase only implies campaign-scoped usage without instructing the agent on tradeoffs.

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