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

Goes well beyond the annotations: discloses that credits are spent, that the definition gets locked, that cost changes invalidate approval, and gives explicit output-handling guidance (show the returned url link, never expose backend run/test IDs). The destructiveHint/openWorldHint annotations are corroborated and enriched rather than merely restated.

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?

Four tight sentences, action-front-loaded, with the cost/approval gate next and output guidance last. No sentence is filler.

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?

An output schema exists so return values needn't be documented, and the description still adds useful display guidance. The mutation and credit-spend semantics are covered; only the meaning of definitionRevision/testId is left implicit.

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 param meaning. It does define maximumCharge as the approved cost amount, but testId and definitionRevision are left unexplained, so compensation is only partial.

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+resource ('Launch the previewed revision and spend credits') and pins the scope to the previewed revision, which cleanly separates it from preview_test_launch. An agent knows exactly what this does without opening the schema.

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?

Establishes the prerequisite flow by naming preview_test_launch as the source of the approved cost and warning that cost changes require new approval. It doesn't phrase an explicit 'do not call before previewing' exclusion, but the sequencing is clear enough to route the agent correctly.

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