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

Annotations already declare the safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=false). The description's only addition is the semantic clarification that creating a library is not an approval action, which is useful but thin; nothing is said about permissions, duplicate-name behavior, or side effects.

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?

Two short sentences with the action front-loaded and no filler. The second sentence is oddly granular in its list of non-approvable items, but it is brief and does not bloat the definition.

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 values need not be described, and annotations carry the safety profile. Still, for a create tool with two undocumented parameters and no explanation of what a 'library' represents or how duplicates are handled, the description leaves meaningful gaps.

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% and neither 'name' nor 'description' is annotated in the schema. The description adds no meaning to either parameter — no naming conventions, uniqueness expectations, or what the optional description field is for — leaving both under-specified.

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 ('Create') and resource ('a library for sendable wording'), which is enough to distinguish it from read/list siblings like list_outbound_libraries and get_sendable_wording. The term 'sendable wording' is domain jargon but is consistent with the sibling naming convention.

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 second sentence acts as a when-not clause ('does not approve... any other sentence'), which implicitly routes approval intent to approve_sendable_wording. However, it never states when to use this tool versus list_outbound_libraries or the save/suggest tools, so the guidance is implied rather than explicit.

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