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

With no annotations, the description carries the full burden, and it discloses almost nothing: not whether the call makes a live network request, how redirects/hops are followed, whether it fails on non-short-link inputs, or whether results are cached. 'Runs the same code the tool page runs' is mysterious rather than informative and doesn't help an agent predict behavior.

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?

It's short and front-loaded with the action in the first sentence. The trailing 'Scope: check' fragment adds little but costs little; 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?

For a one-parameter resolver with no output schema, the description should at least hint at what comes back (final destination URL, redirect chain, hop count). It says nothing about the return value or about the near-duplicate sibling check_resolve_url, leaving real ambiguity for the agent.

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 required parameter is documented as 'Full URL including scheme,' so the schema does the work. The description adds no extra meaning about the url parameter, 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?

The description gives a specific verb and resource: 'Resolve a short link.' An agent immediately understands the operation. However, it does not differentiate itself from the sibling check_resolve_url, which by name appears to do the same or a very similar thing.

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?

There is no when-to-use guidance at all. It never says to pick this over check_resolve_url or check_redirects, nor does it state any preconditions (e.g. that the input must be a shortened URL rather than a full one). 'Scope: check' is not actionable guidance.

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