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

Annotations declare readOnlyHint=false, idempotentHint=true, openWorldHint=true and destructiveHint=false, so the write-but-not-destructive profile is already given. The description adds genuinely useful context beyond that: owner-rights requirement, that price/cancellation/tracking config must be substantiated, and that errors remain open. It does not explain what happens on a revision mismatch or how partial failures are reported.

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?

Dense but front-loaded: the core action comes first, then the revision source, then the exclusions. The negation list is efficient. The opening sentence packs several clauses into one long construction, which costs some readability.

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 three-parameter mutation with no output schema and no schema descriptions, the description covers scope, prerequisites and exclusions well. Gaps remain around the parameters themselves and around what the call returns or how a failed evidence check surfaces, which matters since errors are said to stay open.

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 0% for three parameters, so the description carries the burden; it does helpfully ties expectedRevision to get_search_ads_evidence and its format. However, offerKey and surfaceKey are never explained, and the constraint that surfaceKey is optional and what it selects is left entirely implicit.

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 names concrete actions: derive evidence from the versioned tenant policy, read-verify the published tenant-bound HTTPS landing page, and document it in the existing search-ads draft. It distinguishes itself from get_search_ads_evidence by pointing there only as the source of expectedRevision. It is slightly diffuse because the verb chain is buried mid-sentence in a long German clause.

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 says to take expectedRevision from get_search_ads_evidence and lists what is out of scope: no self-submitted claims, no legal or budget approval, no Google write calls. It does not name a sibling to use when the caller merely wants to read evidence, which would have made routing unambiguous.

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