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

Annotations already declare destructiveHint=true, readOnlyHint=false and openWorldHint=true, so the safety profile is known. The description usefully adds that credentials stay server-side and that mutations need preview plus confirmation, but the confirmation workflow is largely duplicated by the confirmationToken parameter's own schema description, so net added value is modest.

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?

Three short sentences with no rambling, but the leading sentence carries zero information beyond the title. The genuinely useful content (connection, credentials, confirmation requirement) is buried after the redundant opener rather than front-loaded.

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?

This is an 11-parameter raw passthrough proxy with no output schema, and the description never explains the passthrough semantics, response shape, resource-version content types, or pagination differences across SD resources. Given the tool's complexity, the definition leaves the agent to reconstruct behavior entirely from the schema.

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%; every one of the 11 parameters, including method, fetchAll, maxResults and confirmationToken, is documented in the schema. The description adds nothing about how to shape body/queryString for SD creatives, so the baseline 3 applies.

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 first sentence is a verbatim restatement of the title ('Amazon Ads: sd/creatives API'), and the rest says only that it is a Nexscope-proxied Amazon Ads call. The SD/creatives resource family is identifiable against siblings like sd_campaigns or sd_targets, but the description never states what a creative is or which operations (list/create/modify) are exposed through this entry point.

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?

There is no statement of when to use this tool versus the many sibling SD tools, the higher-level nexscope_amazon_ads_manager, or the other developer_proxy endpoints. The only contextual hints (connection ownership, preview/confirmation) are preconditions, not selection guidance.

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