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

Annotations already indicate a non-read-only, non-destructive operation. The description adds the phrase 'prepare or update,' which introduces ambiguity about whether the action is staged or immediately applied, but it does not explain the workflow or any side effects. It fails to clarify what 'prepare' means in this context.

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?

The description is a single, front-loaded sentence with no filler words. It is concise and easy to parse, though the phrase 'prepare or update' could be replaced with a more precise verb to improve clarity without adding length.

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 mutation tool with four parameters and zero schema coverage, the description is incomplete. It does not explain the prepare/update workflow, how current_bid_amount is used, or any operational context such as whether confirmation is required. The output schema exists, so return-value detail is not required, but the missing workflow and parameter context leave significant gaps.

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%, so the description must compensate, but it only maps 'bid amount' to the bid_amount parameter. It does not explain adset_id, ad_account_id, or current_bid_amount, and there is no guidance on how the parameters relate to the 'prepare' versus 'update' distinction.

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 a specific verb-resource pair ('prepare or update' + 'one ad-set bid amount'), and the resource term 'bid amount' distinguishes it from sibling tools like overview_update_adset_budget and overview_update_adset_status. The word 'prepare' is slightly ambiguous, but the core purpose is clear.

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 description gives no explicit guidance on when to use this tool versus alternatives, nor does it mention any exclusions or conditions. The only implied usage is that it applies to a single ad set's bid, but there is no actionable routing information.

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