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

Annotations already declare read-only and closed-world behavior, but the description adds valuable context by listing the return fields, explaining adsPublisherId as a BYO Google Ads ID, and warning to verify the target game before shipping the key. It does not cover auth/permission requirements, but this is reasonable given the read-only annotation.

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 compact sentences, front-loaded with the returned fields. Each sentence earns its place: return shape, adsPublisherId detail, and the target verification warning.

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?

No output schema exists, so the description appropriately lists the main return fields and explains adsPublisherId. However, it mentions a returned target field that is not included in the enumerated return list, leaving a small inconsistency about the full response shape.

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 both parameters are already documented in the input schema. The description adds meaning around the returned adsPublisherId field but does not add further semantics for the game or roomName parameters beyond what the schema provides.

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 action and enumerates the returned fields (wsEndpoint, roomName, publishableKey, adsPublisherId) for wiring a client. It is clear on its own but does not explicitly distinguish itself from sibling tools like get_client_snippet or get_sdk_reference.

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?

Gives a clear usage context ("for wiring a client") and a caution to verify the returned target before shipping the key. It lacks explicit when-not guidance or named alternatives, but the context is clear and actionable.

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