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

Adds substantial context beyond the annotations: nothing is generated, no credits are spent, and no sign-in is required, which tells the agent this call is effectively a dry-run prep step. It does not, however, explain what state is actually created given readOnlyHint=false and idempotentHint=false, so calling it twice or its persistence side effects remain unclear.

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?

Purpose and panel/style options are front-loaded, and the return-behavior, auth, and exclusion clauses each carry real information. The paragraph is dense and slightly run-on, but no sentence is filler.

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 details need not be spelled out, yet the description still summarizes the return (settings and required credits). Combined with cost, auth, and content-policy boundaries, an agent has everything needed to call this correctly.

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 100% and the description largely restates what the schema already documents (panel counts, style options, default model). The one genuinely additive note, that nano-banana-pro yields 'readable bubbles', is also present in the schema, so the description earns only the baseline.

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) plus the resource (comic strip) and enumerates the concrete inputs: panel counts, story, characters, dialogue, and styles. The Abracadabrax branding and the 'prepare, not generate' framing cleanly separate it from generate_media and the other media 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?

Gives explicit when-not guidance: no copyrighted characters, franchises, logos, trademarks, or real celebrities (offer an original alternative instead), and no uploaded/attached/reference images or videos, with a pointer to the Abracadabrax workspace for those cases. This is exactly the routing information an agent needs to avoid misuse.

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