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

Annotations already declare destructiveHint=true, readOnlyHint=false and openWorldHint=false, so the safety profile is covered structurally. The description adds nothing beyond that: it does not state that the change is applied irreversibly, what gets mutated, or whether confirmation consumes/invalidates the draft.

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?

A single front-loaded sentence with no filler or redundancy. It is appropriately terse, though the brevity borders on under-specification rather than deliberate economy.

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 mutation in a two-phase confirm flow with no output schema and sparse parameter documentation, the description omits prerequisites (draft must exist), the irreversible nature of confirmation, and any indication of what the agent receives back. It is not sufficient to call the tool correctly with confidence.

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 only 33% (only customer_id is documented). draft_id and connection_context have no schema description, and the description supplies no meaning for them, nor does it clarify that draft_id comes from the prepare step. The description fails to compensate for the low coverage.

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 ('Confirm') and resource ('bidding update draft'), and the name pair with google_ads_bidding_update_prepare makes the two-phase flow evident. However, the description never explains what confirming actually does (execute/apply the drafted bid change), so it is clear but not fully differentiated in the text itself.

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?

No when-to-use guidance, no stated prerequisite that a draft must first exist via google_ads_bidding_update_prepare, and no mention of when confirmation is inappropriate. The agent must infer the entire prepare-then-confirm workflow from sibling naming.

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