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

Annotations already declare readOnlyHint=true, openWorldHint=true, idempotentHint=true, and destructiveHint=false, fully covering the safety profile. The description adds useful behavior context — that it returns both the latest launch AND the latest approved launch for comparison — but doesn't disclose details like pagination, result limits, or error handling for missing launches. With strong annotation coverage, the added value is modest but present.

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?

The description is information-dense and well-structured — a single cohesive paragraph that front-loads the purpose, lists return contents, states the use case, notes the comparative launch, and ends with the input requirements. Every sentence earns its place, though it's slightly longer than the tightest possible form and could be split into clearer sections.

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?

Given the output schema exists (so return format is documented elsewhere) and annotations fully cover the safety profile, the description adequately handles the tool's moderate complexity. It covers purpose, inputs, use case, and comparative output. It could be slightly more complete by noting what happens when no prior launch exists or clarifying the diff edge cases, but for a comparably rich read-only inspection tool, it's substantial.

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 input schema provides only field names (graphId, variant) with no type detail or descriptions. The description compensates partially by instructing 'Provide the graph ID and variant name' and explaining the variant context, but per the rubric, with 0% coverage the description must fully compensate. It does identify what each parameter is conceptually, though not with deep syntax or format detail.

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 is highly specific: it names the exact verb+resource (inspect the most recent launch), enumerates the specific data points returned (status, completion time, subgraph changes, composition errors, schema diff summary with additions/removals/edits/deprecations, affected operations), and provides a clear comparison distinction (latest approved launch). This clearly distinguishes it from siblings like GetLaunch and GetLaunchHistory, which focus on individual or historical launches.

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 description gives clear context for when to use the tool ('assess schema composition health and the impact of recent schema changes') and explicitly provides the required inputs ('Provide the graph ID and variant name'). It doesn't explicitly name alternatives to exclude, but the distinct purpose (comparing latest launch vs latest approved launch, schema diff focus) is sufficiently differentiated from sibling tools like GetLaunch and GetLaunchHistory.

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