kdp_set_cover_finish

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

With no annotations, the description must carry the behavioral load. It usefully discloses that this is a write requiring user authorization and that it verifies afterward, but it omits what happens on failure, whether a mismatched expected_finish aborts the write, or whether the operation is idempotent.

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?

Two short sentences, front-loaded with the operation and its scope; nothing is padded. The telegraphic style costs a little clarity but wastes no space.

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 need not be described, and the description covers goal, precondition, and auth. However, for a four-parameter mutation with 0% schema coverage and no annotations, leaving the parameter set and failure behavior unexplained is a meaningful gap.

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% across four required parameters, so the description is the only source of meaning. It hints that 'finish' takes MATTE or GLOSSY, but page_id, draft_id, and especially expected_finish are left completely undefined.

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 (Save) and resource (MATTE/GLOSSY cover finish) scoped to an existing draft, and adds a verify step. It is clearly distinct from kdp_tabs and kdp_draft_status, though it never explicitly names them.

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 a precondition ('on an uncertified existing draft') and an authorization rule ('User-authorized writes only'), which is real usage guidance. It stops short of saying when to prefer this over alternatives or what to do when the precondition fails.

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