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

Annotations declare destructiveHint=true and idempotentHint=true, and the description adds real substance on top: publishedUrls replaces the entire list (so existing entries must be retained), existing measurement dates cannot be overwritten, and it requires the actions.write scope. It also discloses that measurement starts at the went-live date independently of crawling/page-tracking, which materially affects consequences of the call.

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?

Five short sentences, with the core action and the approval prerequisite front-loaded. Every sentence carries operational content; the measurement-date-start sentence is slightly tangential but still relevant to outcome tracking.

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 destructive, auth-gated mutation with no output schema, the description covers permissions, list-replacement semantics, immutability of existing dates, and measurement timing. The main gap is that changeEventId's purpose is never explained, so an agent still cannot reason about that optional parameter.

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 0%, and the description only clarifies one of four parameters meaningfully (publishedUrls replaces the list; retain existing entries). actionId, url, and especially the optional changeEventId are left entirely to the schema types with no semantic explanation.

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 verb (attach) and resource (published URL) scoped to a completed action, which is far more precise than the generic siblings like devtune_update_action. It never names the alternative sibling it should be chosen over, so it falls short of a 5.

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?

The prerequisite 'Obtain human approval first' and the constraint that the action must be completed give practical context for when this applies. However, it gives no explicit when-not guidance and never contrasts itself with devtune_update_action or the outcomes-ledger reads, leaving selection partly to inference.

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