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

No annotations are supplied, so the description carries the burden. It does disclose the nature of the response (identity plus links to sitemap, docs, contact, discovery documents), which is meaningful behavioral context, but says nothing about whether it is read-only, side-effect free, or requires authentication.

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?

A single sentence with no waste; the core purpose (what Vigil is) is front-loaded and the enumeration of returned links follows immediately. Every clause earns its place.

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 and no annotations, the description must cover the return value, and it does so at a high level by naming the categories of links returned. It is nearly complete for a trivial zero-argument discovery tool, with only minor ambiguity about the exact response shape.

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?

The tool takes zero parameters, so the baseline is 4. There is nothing parameter-related the description could or should add, and the schema correctly declares an empty object with additionalProperties false.

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 specific resource (site information for Vigil/blvigil.com) and enumerates the payload: sitemap, docs, contact and discovery documents. It is clear what an agent gets back, though it does not explicitly contrast itself with siblings like read_page or search_pages.

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 guidance on when to call this tool versus read_page or search_pages, nor any prerequisite or exclusion. The agent must infer that this is the entry-point/discovery tool from the description alone.

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