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

Annotations already establish that this is a read-only, non-destructive operation, and the description adds useful scope: it reads the workspace draft and includes pending unpublished changes plus the live version. That is meaningful behavioral context beyond the annotations, though it does not address operational details such as permissions or output limits.

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?

The description is a single front-loaded sentence with a compact semicolon-separated inventory of what is included. Every clause adds useful scope information and there is no filler or repetition.

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?

For a read-only overview tool with no output schema, the description usefully enumerates what the inventory contains, including pending changes and the live version. Combined with the annotations and fully described input schema, it is nearly complete, with the main gap being sibling differentiation and usage routing.

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%, so all five parameters are already well documented in the schema. The description only loosely maps to container and workspace concepts and adds no detail about the detail, folder, or language parameters beyond what the schema provides, so it sits at 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?

The description clearly states that the tool inventories a container's workspace draft and enumerates the included entities: tags, triggers, variables, pending changes, and live version. It is specific about the resource and scope, but it does not explicitly distinguish this overview from siblings such as gtm_pending_changes, gtm_versions, or gtm_audit.

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?

The description gives no explicit when-to-use guidance, no when-not-to-use guidance, and no alternatives among the many sibling GTM tools. An agent must infer from the word 'Inventory' that this is an overview tool, but nothing routes it away from more targeted tools like gtm_pending_changes or gtm_tag_details.

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