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

With no annotations, the description carries the full behavioral burden. It implies an irreversible destructive mutation but says nothing about whether deletion is recoverable, whether ownership or permission is required, or what happens if the slug does not exist or has already expired. 'Before it expires' is the only behavioral hint and it is ambiguous.

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 tight, front-loaded sentence with no filler; the verb and resource come first. The trailing qualifier is serviceable but slightly vague, keeping it just short of a 5.

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?

An output schema exists so return values need no explanation, and the single required parameter is fully documented. However, for a destructive operation with zero annotation coverage, the description should disclose irreversibility, permission needs, or error behavior, which it does not.

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?

There is a single parameter and schema description coverage is 100%, with the schema already documenting 'The shortlink slug to delete.' Baseline 3 applies because the description adds no syntax, format, or identification detail beyond the schema.

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 (delete) and resource (shortlink), with the added qualifier 'before it expires' that scopes the operation. It is distinguishable from create_shortlink/resolve_shortlink/shortlink_status, though it never names a sibling explicitly, so it does not reach the 5 level.

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 phrase 'before it expires' hints at timing but gives no actual when-to-use guidance, no exclusions, and no alternatives among the three sibling tools. Nothing tells the agent when deletion is appropriate versus letting a link expire naturally.

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