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

With no annotations, the description carries the full load. It usefully discloses the 8-hop cap and the per-hop return content (status code and Location), but says nothing about HTTP method used, timeout behavior, error handling, or what happens when the hop limit is exceeded.

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?

Two tight sentences with zero waste; the mechanism and hop limit are front-loaded before the diagnostic use case.

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?

No output schema exists, so the description must explain returns, and it does so adequately by describing per-hop status codes and Location targets. Edge-case behavior such as errors and hop-limit overflow is the only notable gap.

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?

A single parameter with 100% schema coverage, and the schema already documents that it accepts a URL or bare domain. The description adds no syntax, format, or normalization details beyond what the schema provides, so baseline 3 applies.

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 (follow), resource (URL redirect chain), and scope (up to 8 hops), plus what gets reported per hop. An agent can distinguish this from http_head or seo_snapshot without opening the schema.

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?

Explicitly names the diagnostic use cases: redirect loops, http->https, and www canonicalisation issues. It gives clear positive context but never contrasts against siblings like http_head or seo_snapshot, so the when-not guidance is absent.

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