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

Annotations already declare destructiveHint=true, readOnlyHint=false, and openWorldHint=true. The description adds two pieces of genuinely new context: routing is derived server-side (agent need not build paths) and mutations are two-step preview/confirm. It stops short of saying what a preview returns or what happens if confirmationToken is omitted.

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 with no filler, and the scoping constraint (operation IDs) is front-loaded before the workflow rule. Efficient, though borderline terse given the tool's complexity.

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 7-parameter destructive dispatcher with no output schema, the description plus rich schema fields cover the core mechanics, but it omits return-shape expectations, preview output, and sibling differentiation. Adequate but with clear gaps an agent must resolve by opening 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 coverage is 100%, so every parameter is already documented in the schema. The description adds a constraint on operationId (must be a documented ads_manager.sb/sd/sp ID), which is mildly useful beyond the schema example, but contributes nothing on payload, action, or confirmationToken semantics. 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 description explains the mechanism (accepts ads_manager.sb/sd/sp operation IDs, server-side routing) but never states in plain terms that this is a generic dispatcher/proxy to the Amazon Ads API. An agent can infer the resource (Amazon ads) but cannot easily tell it apart from siblings like nexscope_amazon_ads_manager, nexscope_amazon_ads_api_access, or nexscope_route_api.

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 gives one concrete rule: mutations must be previewed then confirmed. That is real usage guidance. However, there is no statement of when to pick this tool over the numerous amazon_ads developer-proxy siblings or ads_manager, and no guidance on read-only operations.

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