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

Discloses behavior well beyond the annotations: a lead is consumed from a monthly pool, already-delivered creators are free, a plan tier is required, and the call is a two-step preview/confirm flow. It names the concrete error code and its remedy. Annotations only say it is non-destructive and idempotent; the description carries the real cost and sequencing semantics.

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?

Four sentences, front-loaded with the action and lookup key, then cost/eligibility, then the two-step protocol, then the failure mode and remedy. No filler and no repetition of the schema.

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?

With no output schema, the description does cover the first-call return (preview plus confirmation_token) and the second-call requirement, which is the critical thing an agent needs. It does not say what the final saved record looks like or how tags/stage/list_ids affect the save, a minor gap for an 8-parameter mutation.

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 63%, roughly baseline territory. The description explains the confirmation_token protocol ('call again with the token only after the user agrees to spend the lead') and that the lookup key is platform + handle, but tags, stage, list_ids, uid and bearer_token get no mention, so half the non-required surface is left to the schema alone.

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 and resource: 'Save one creator from the UGC Database into the user's Creator CRM by platform and handle.' It also identifies the operation as the app's unlock, which separates it from generic CRM write siblings like update_crm_lead and remove_crm_lead.

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?

Gives clear gating conditions (plan must be Pro or higher; lead cost) and an explicit alternative for the failure path: 'Fails with creator_not_found ... (run a search instead).' It does not, however, explain how this differs from the sibling unlock_ugc_database_creators, which appears to perform the same unlock operation.

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