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

Annotations already declare readOnlyHint=false and openWorldHint=true, so the safety bar is partly covered. The description adds real context beyond them: credentials stay server-side, and mutations must go through a preview-then-confirm flow, which tells the agent how destructive operations are gated. It still omits what a mutation affects or rate-limit behavior.

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 short sentences, with the resource identity front-loaded and no filler. The credential and preview/confirmation notes are efficient, though the opening sentence is redundant with the title.

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?

With 11 parameters, no output schema, and a raw API-proxy surface, the description covers the auth and mutation-safety story but says nothing about what the SD creatives resource returns or what the extended path yields. It is minimally sufficient alongside the fully described schema, but not complete.

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 100%, so all 11 parameters (method, fetchAll, confirmationToken, includeExtendedDataFields, etc.) are already documented in the schema. The description adds no parameter-level meaning, which is acceptable at full coverage but earns only the baseline.

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 restates the tool name and title ('Amazon Ads: sd/creatives API') without adding a verb or explaining what a Sponsored Display creative actually is. The resource name does let an agent distinguish it from siblings like sd_campaigns or sd_targets, but the statement of purpose is essentially tautological.

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?

'Mutations require preview and confirmation' implies a two-step workflow for writes, which is genuine usage guidance. However, there is no explicit when-to-use versus alternatives (e.g., when to reach for sd_creatives vs sb_ads_creatives_list), and no prerequisite or scope conditions beyond the connection reference.

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