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

The description discloses a crucial behavioral trait: the operational cost ('cost: 1 credit'). This is specific behavioral metadata not captured in the schema or annotations, providing the agent with valuable context regarding resource consumption.

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 definition is extremely concise, using only two sentences, both of which are essential. The primary function is front-loaded and immediately understandable.

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 low-complexity utility, the definition is adequate. It identifies the function and the cost. However, it lacks operational detail common for network tools, such as error handling or timeout behavior.

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?

With schema description coverage at 100%, the baseline score of 3 applies. The description does not add specific meaning or constraints to the 'url' parameter beyond the functional requirement that the tool processes a URL.

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 defines the action ('Follow redirects') and the intended result ('to the final URL'). It successfully distinguishes itself from the data processing siblings by focusing on network traversal rather than simple data transformation.

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 others; it is a feature statement, not a usage guideline. Since there are no direct alternatives listed in the description, the agent has no contextual cue on when to pivot to a different tool.

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