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

Even with readOnlyHint=true, the description adds substantial context: it makes zero provider calls, stores no hosted state, creates no Paddle account/catalog, charges nothing, accepts no secret values, is idempotent, reads current server state, and the hash is not an approval/signature. This goes well beyond the annotations and clarifies exactly what side effects do not occur.

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 long but well front-loaded with scope and prerequisites, and nearly every clause adds safety or workflow value. The 'Confirmation boundary' sentence is somewhat overwrought and the prerequisite text is slightly redundant, but the labeled sections make the dense information navigable.

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 complex 11-parameter tool with no output schema, the description covers effects, idempotency, prerequisites, and next steps well. However, it never describes the shape of the returned project/hash/manifest, which the agent needs to commit the manifest, and it leaves several required inputs unexplained. The workflow context is strong, but the output contract is too vague for a draft-generation tool.

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 only 18%, so the description needed to compensate for undocumented parameters, but it only refers to inputs generically. It adds that projectKey and inputs determine the deterministic result and that secret values should not be passed, but it does not explain key required parameters like businessModel, billingModel, customerType, or targetCountries beyond their enum names.

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 opens by naming the exact scope (Legacy Paddle path only) and a precise action: generate an integrity-hashed sandbox-only manifest after prepare_revenue_launch reports sandbox_build_ready. It also names the next workflow step, configure_payment_catalog, making the tool's role unambiguous among many payment siblings.

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?

It states explicit when-to-use conditions: legacy Paddle path, after prepare_revenue_launch returns sandbox_build_ready, and with authenticated active organization access. It does not explicitly name alternative tools, but the 'Legacy Paddle path only' restriction and the 'Next call' pointer provide strong routing.

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