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

Adds substantial behavior beyond the annotations: it CREATES the workspace when none exists, it is free, it requires the `creative:generate` scope, and it returns `created: true` when freshly made. Those facts (write side effect, auth requirement, cost, idempotent create semantics) are exactly what an agent needs and are not derivable from the annotation block alone.

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?

Front-loads the resource identity, then the create-on-first-ask caveat, then the permission and the returned flag — a sensible order with little redundancy. It is a single long em-dash-heavy sentence chain, which is dense but every clause contributes.

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?

No output schema exists, and the description still covers the one return value that matters (`created: true`) plus how to consume the id downstream. Along with the permission and side-effect disclosure, an agent has everything needed to call this correctly and interpret the result.

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 100%, so both parameters are already documented; the description restates the site_id provenance (already in the schema) and says nothing about `user_goal`. Baseline 3 applies since the schema carries the parameter burden.

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+resource: fetch the Creative Studio brand workspace for a site, and makes the key nuance explicit (it creates the workspace on first ask). This is clearly distinguishable from siblings like get_brand, create_brand and list_brands, which the description implicitly routes around by naming list_brands `websites_without_brand` as the id source.

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 concrete usage context: pull site_id from list_brands `websites_without_brand` or list_sites, then use the returned id as `brand_id` for visuals, films and calendar. It explains the first-ask behavior well but never explicitly contrasts with create_brand or get_brand (i.e., when to prefer an explicit brand read over this lazy-create path), so the alternative-selection guidance is only partially covered.

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