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

Annotations only set readOnlyHint, idempotentHint, and destructiveHint to false, leaving the description to carry behavioral detail. The description adds that the topic id is generated and returned and that a missing section causes a 404. This is useful, though it does not cover duplicate-name behavior or the full response shape.

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 sentences with no filler: the first states the action and scope, the second reports the generated id and the key failure mode. All information earns its place and the purpose is front-loaded.

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 creation tool with seven parameters and no output schema, the description covers the essential context: creation inside a section, the generated id being returned, and the 404 error case. The remaining details are handled by the fully documented schema, so nothing critical is missing, though duplicate handling is not addressed.

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 explains every parameter including required fields, enums, and defaults such as routing_options defaulting to empty. The description adds no parameter-specific meaning beyond the schema, matching the baseline for full coverage.

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 opens with a specific verb-and-resource statement — 'Create a subscription preference topic inside a section' — which clearly distinguishes this from section-level operations like create_preference_section. It also adds the unique outcome of a generated, returned topic id.

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 establishes the parent context by requiring an existing section and explicitly calling out the 404 failure when the section is missing, which signals a prerequisite. It does not explicitly name alternatives such as create_preference_section, but the context makes the routing decision clear.

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