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

Annotations only say readOnlyHint=false/openWorldHint=true/destructiveHint=false; the description adds meaningful context by clarifying that this call 'does not change delivery' and that it saves an approval draft rather than mutating live state, plus what the call returns (approval_ref, plan_digest). It still doesn't disclose the authorization/scope requirements hinted at by 'your authorized account'.

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?

Roughly four short clauses, all front-loaded with the core action first, then return values, then safety note, then alternative. No filler sentences.

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?

An output schema exists so return structure need not be explained, and the description still names the returned references and the approval handoff, covering the prepare/confirm workflow. The main gap is the complete absence of parameter-level information given 0% schema coverage.

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% across 4 parameters, and the description adds nothing about adset_id, ad_account_id, target_configured_status (enum ACTIVE/PAUSED), or the connection_context pattern. The description does not compensate for the schema's missing parameter documentation.

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 (prepare) and resource (ad set status change) with clear scope ('one ad set status change') and contrasts it with the follow-up tool operations_confirm_adset_status, so an agent can distinguish it from the many other prepare_* siblings.

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 apply only after approval via operations_confirm_adset_status and to prefer entities_prepare_update for new work, which gives both sequencing and an alternative. However, the phrase 'for new work' is vague about the exact boundary between this tool and entities_prepare_update.

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