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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description earns credit by disclosing what the operation actually returns — per-hop status codes and destinations — and by naming the specific conditions it flags (loops, chains of two or more redirects, temporary redirects, plain http landing pages). It does not mention hop limits, timeouts, or network failure handling, which are the main remaining behavioral gaps.

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 front-loaded sentence with the core action first, followed by the enumerated findings. Every clause carries information; no filler or repetition of the title. Slightly dense as a single run-on clause listing, but not bloated.

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 no output schema, the description usefully compensates by describing the returned hop list and the flagged conditions. For a single-parameter read-only network tool that is close to sufficient; only operational limits (max hops, timeout) are absent.

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 description coverage is 100% and the single url parameter already documents the https:// assumption, so the schema does the heavy lifting. The description adds no additional meaning about the parameter beyond what the schema states, which is the expected baseline here.

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 concrete verb and resource — following an address hop by hop and listing each hop with its status code and destination — and enumerates the findings it surfaces. That makes it clearly distinct from siblings like check_http_headers and check_page_seo, though it never names them explicitly.

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 usage is only implied: an agent can infer it should call this when it wants to see where a URL redirects and whether a chain is problematic. There is no explicit when-to-use framing, no when-not, and no mention of alternatives among the sibling checks.

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