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

With no annotations provided, the description carries full burden and delivers meaningful disclosures: never mutates TikTok, returns a single-use approval_ref, and is bounded to tenant-owned entities. These go beyond what the schema reveals. Minor gap: 'bounded' and the validation semantics are not elaborated, but the safety profile (read-only preparation) is well communicated.

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?

Three sentences, zero filler, with purpose front-loaded and the entity_type caveat placed at the end. Each sentence earns its place; it is efficient without being under-specified on the points it does cover.

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 7-required-parameter tool with no output schema and no annotations, this is incomplete. The description explains only entity_type, does not clarify the relationship to delivery_status_confirm, and leaves the semantics of run_id, rule_id_and_version, idempotency_key, and entity_refs entirely to the agent's inference. A complex prepare tool needs more.

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 for all 7 required parameters, but it only addresses entity_type (ad_group vs adset alias). The other six — ad_account_id, entity_refs, target_status, run_id, rule_id_and_version, idempotency_key — receive no explanatory context in either the schema or description, leaving the agent to guess at their meaning and constraints.

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 action (validate/prepare a delivery-status change), the resource scope (bounded tenant-owned), and the output (single-use approval_ref). It reads distinctly from delivery_status_confirm and the other prepare tools. The purpose is immediately unambiguous.

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 declares non-mutation, which signals this is a validation/preparation step rather than a committing action, and gives entity_type guidance (native ad_group vs adset alias). However, it never names the natural partner delivery_status_confirm or states 'use this before confirming,' nor does it contrast with bid_prepare/budget_prepare for other change types.

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