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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is fully covered without the description. The description adds the default-resolution behavior (latest crawl when no snapshot is given), which is genuine context beyond the annotations, but says nothing about response shape or limits.

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 compressed sentence with the resource and payload front-loaded and no filler. It is slightly telegraphic as a noun phrase rather than a full clause, but nothing is wasted.

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 two-parameter, read-only tool with no output schema, the description covers the core scope and default behavior adequately. It leaves gaps around the sibling render_site_health relationship and what the returned 'top issues' actually contain.

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 0%, so the description must carry parameter meaning. It clarifies that snapshot_id selects a specific snapshot versus defaulting to the latest crawl, but says nothing about project_id (the required parameter) or the UUID format expectations.

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 (read) and resource (Site Health) and names the concrete payload: scores, coverage, and top issues. It does not differentiate itself from the sibling render_site_health, so an agent must guess at the read-vs-render split.

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 phrase 'for the latest crawl, or a chosen snapshot_id' implies the two usage modes (default to newest, or target a specific snapshot), which is useful conditional guidance. However, it never states when to prefer this over render_site_health or the other read_* visibility tools, so alternatives are left to inference.

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