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

Goes well past the annotations by disclosing that the call is free, spends no credits, and creates no artifact, plus that the returned planId is valid 24 hours and single-use. These are exactly the operational facts an agent needs before quoting a price to a user, and none of them are recoverable from the schema or hints.

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 tight single paragraph where each sentence carries a distinct fact (auth, setup link, price-only semantics, return shape). It loses a point for leading with account/OAuth boilerplate ahead of the core purpose, pushing the actual 'what this does' later than ideal.

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 10 parameters, one nested object, no output schema, and a required-element handoff to a second tool, the description still covers prerequisites, cost behavior, return values (planId plus exact credit cost), and the next step. Nothing an agent needs to call it correctly is missing.

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 90%, so nearly every parameter is already documented in the schema and baseline 3 applies. The description adds only the notion that credit cost depends on 'the chosen model tier', without explaining the tier/cost relationship or the reference-image pairing rules that the schema covers.

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 — prices a single transparent WebM video — and goes further to say what it is NOT (a plain animated clip, not an AI Alert, no chroma-plate, no OBS wiring). That explicitly separates it from create_alert_pack and from the sibling create_transparent_video, which actually renders.

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?

Spells out the prerequisite (approved AlertForge account connection, OAuth sign-in), the sequencing rule (show the returned cost and get confirmation before calling create_transparent_video), and the alternative path by naming the exact follow-up tool and the planId handoff. Nothing about when to call it is left to inference.

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