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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint, so the safety profile is covered. The description adds real value beyond them: the 20-URL batch ceiling, the fact that it returns the entire redirect chain, and that results can be verified against expected targets.

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?

Three short sentences, front-loaded with what the tool does, then use cases, then the verification option. Every sentence carries information and nothing is padded.

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?

With an output schema present, return-value details are covered elsewhere, and the description still adds batch limits and redirect-chain semantics. Combined with full annotations and 100% parameter coverage, an agent has everything needed to call this 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 coverage is 100%, so the baseline would be 3; the description slightly exceeds it by explaining the intent of 'expected' as verifying that each redirect lands where intended. It still leaves the ordering/integer semantics of 'expected' to 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?

The description gives a concrete verb+resource (check URLs) and names the exact outputs — final status code, full redirect chain, and final destination — so an agent immediately knows what this returns. It does not explicitly name or contrast any sibling tool (e.g., test_robots or scan_page), so differentiation is implied rather than stated.

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?

It supplies clear triggering scenarios — site migrations, broken-link sweeps, launch checks — and a concrete example question ('do all old URLs 301 to the right new page?'). It never states when NOT to use it or names an alternative, so it stops short of explicit routing guidance.

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