Create User Permission

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

With no annotations provided, the description carries the full burden of behavioral disclosure, yet it only reveals that access is granted. It does not disclose what happens if the permission already exists (error vs. overwrite), whether granting is additive or replaces existing permissions, whether authorization is required, or how the operation affects the account.

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 single sentence with zero wasted words, front-loaded with the action verb and resource. It is appropriately sized and immediately scannable, though its brevity does sacrifice behavioral detail captured in other dimensions.

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?

The presence of an output schema and a richly detailed input schema (with examples and enum values) means return values and parameter construction are covered elsewhere. The gap is behavioral context: an agent gets no information about idempotency, duplicate handling, or prerequisites, which is notable for a permission-granting mutation.

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 the schema already documents both parameters thoroughly, including a detailed JSON example with enum values for account and container permissions. Per the baseline rule for high schema coverage, a 3 is appropriate; the description itself adds no parameter-level meaning.

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 states a specific verb ('Grant') with a clear resource ('user access to a Tag Manager account'), making the tool's function obvious. It is distinguishable from siblings like create_container or create_workspace by naming the permission domain, though it does not explicitly differentiate itself from update_user_permission or delete_user_permission.

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 provides no guidance on when to use this tool versus the closely related siblings update_user_permission, delete_user_permission, or list_user_permissions. There are no exclusions, prerequisites, or alternative-routing hints, leaving the agent to infer the usage context entirely from the tool's name.

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