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

The readOnlyHint=true annotation already establishes the safety profile, so the description's job is lighter. It adds value by disclosing the returned content (observations, reproduction command, source evidence), which matters because there is no output schema, but it says nothing about not-found behavior or whether reports are immutable/snapshot-based.

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 tight sentence with the action front-loaded and the return contents enumerated. Nothing is redundant, though the phrasing is terse enough that it leans on the reader to infer the identifier source.

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 single-parameter read tool with no output schema, listing the three returned artifacts is close to sufficient, and annotations cover the safety profile. The only real gap is guidance on obtaining a valid slug and on failure behavior.

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 single "slug" parameter (string, 1-120 chars) must be explained in prose. The description clarifies that the slug must identify an exact report, which is meaningful beyond the bare type constraint, but it does not state the slug format or where an agent obtains one (presumably from search_compatibility_reports).

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 ("Retrieve") and names the payload contents — observations, reproduction command, and source evidence — for a report slug. The phrase "exact report slug" implicitly separates it from the sibling search_compatibility_reports, though it never names that alternative.

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?

"Exact report slug" hints that this is a lookup-by-identifier tool rather than a search, which is useful routing context. However, there is no explicit statement of when to use it versus search_compatibility_reports, and no mention of what happens if the slug does not exist.

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