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

Goes beyond annotations by disclosing the confirm-based preview-vs-create behavior and the workspace lifecycle role, which the readOnly/destructive/idempotent hints do not convey. It doesn't address idempotency (creating a duplicate-named workspace) or auth requirements, so not a 5.

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 core action and definition, then details container format and safety. Dense but every clause carries information; the only minor cost is a compound first sentence that packs definition, staging purpose, and parallelism together.

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 an output schema present, return values needn't be explained, and annotations cover the safety profile. Purpose, container identification, and the confirm preview are covered; the gaps are the undocumented name/account parameters and idempotency behavior.

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. It documents container format well ('GTM-XXXX' / container name / full path, empty if only one) and the confirm flag, but leaves the required 'name' and 'account' parameters entirely unexplained.

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 ('Creates a new WORKSPACE in a container') and defines what a GTM workspace is — an isolated draft area staged before publishing. This clearly separates it from create_gtm_container/tag/trigger, though it does not name any sibling for explicit contrast.

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 usable context — a workspace is where you stage tag/trigger/variable changes before publishing, and GTM allows several in parallel. It also defines the confirm workflow (false=preview, true=create). No explicit when-not-to-use guidance or named alternatives, so not a 5.

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