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

The description adds value beyond annotations by disclosing that the segment is converted to static. Annotations already provide idempotentHint and non-destructive hints, but the description clarifies the overwrite behavior and conversion.

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, no fluff. Every word adds value: it states the action, target (static segment), and side effect (conversion). Front-loaded with key information.

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 description covers the core operation and side effect. Given that the schema and annotations provide parameter details and idempotency, the description is adequate. However, it could mention prerequisites like segment existence.

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?

With 100% schema coverage, the description adds the 'replace' semantic and clarifies that the operation overwrites existing members, which is not explicit in the parameter descriptions alone.

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 the action: replace members of a static customer segment with specified account IDs, and it distinguishes from siblings like get_segment_members and create_segment by focusing on the replacement operation.

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 implies when to use the tool (to set members), but it does not explicitly mention alternatives or when not to use it. The purpose is clear, but guidance could be stronger by referencing siblings like get_segment_members for reading.

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