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

Annotations declare a mutating, non-idempotent operation; the description adds substantive context: tariff-based rejection of too many or unsupported question types, forbidden duplicate ids, the requirement to generate a fresh UUID per new widget, and that the response returns the actually saved composition to verify against. The one gap is that replace semantics are not spelled out – it never says widgets omitted from ids/entities are removed.

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?

Front-loaded with the action, then prerequisites, then constraints, then the verification step. Dense and mostly free of filler, though the UUID format example and the special-option flag sentence stack up enough that it runs long.

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 a huge nested schema, three required params and no output schema, the description covers the highest-risk failure modes (UUID generation, finish widget, special answers as flags, tariff rejection, saved-count verification). What is missing is the destructive side of a full-structure save: what happens to widgets dropped from the arrays.

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 coverage is 100%, so baseline is 3. The description goes beyond the schema by defining the ordering contract (welcome first, submit last, UUIDs in between), the uniqueness constraint, and the non-obvious rule that a thank-you screen is a separate finish widget with its own UUID rather than a submit field edit.

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 and resource: saving the widget structure of a quiz as ids + entities. The pre-read directive referencing quiz://{id}/structure and the contrast with publish-time behavior makes it distinguishable from get_quiz_structure and update_quiz_texts.

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?

Explicitly tells the agent to read the current structure first, which is a real precondition for a full-replace save. It does not name a sibling alternative for partial edits (e.g. update_quiz_logic / update_quiz_texts), so the when-not-to-use case is left implicit.

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