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

Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false, covering safety. The description adds the cost and network context, which is useful. However, it doesn't disclose behavior on invalid input, whether relative URLs are rejected, or what the return format is – gaps not covered by 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?

One sentence with no fluff – it is appropriately terse for a simple utility. The cost and network qualifier is front-loaded, but the sentence could be more informative without sacrificing brevity.

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 tool with no output schema and one parameter, the description leaves critical gaps: what the parsed output looks like (components, structure), handling of malformed URLs, and any limitations. The cost/network info is helpful but not sufficient for an agent to confidently call it.

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 0%, so the description must compensate. It implies the input should be an absolute URL ('absolute URL parser'), but doesn't specify format, examples, or error behavior. The description adds only a minimal constraint beyond the schema's maxLength.

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 states a clear verb+resource: 'URL parser' – it parses URLs. The qualifier 'absolute' adds specificity, distinguishing it from relative URL handling. It is distinct from sibling tools like base64_encode or keccak256, so the purpose is clear, though it doesn't detail what the parser outputs.

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 guidance on when to use this vs alternatives. It mentions the cost and networks (Base/Solana), but doesn't say 'use this to extract URL components' or point to any sibling like 'resolve' for fetching. An agent must infer usage from the name alone.

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