List segments

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

Annotations already declare readOnlyHint=true, idempotentHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is fully covered. 'Reads account data' merely echoes the read-only nature and adds nothing about pagination, rate limits, or account scoping that the annotations and schema do not already imply.

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 short and front-loaded, but the second sentence ('Reads account data.') contributes almost no information beyond the annotations. It is concise for the wrong reason: under-specification rather than disciplined editing.

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 tool with 7 parameters, no output schema, and only 43% schema description coverage, two terse sentences are insufficient. The description omits default page behavior, cursor semantics, and what a 'segment' contains, all of which an agent needs to call this list tool correctly.

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 only 43% (7 parameters, 4 undocumented: after, before, per_page, include_total_count), so the description should compensate for the gap. Instead it says nothing about any parameter, leaving the pagination and count parameters entirely opaque to the agent.

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 gives a verb and a resource ('List segments'), so the basic operation is identifiable, but it is essentially a restatement of the tool name and adds no scope, filter, or sibling differentiation. An agent cannot tell from this text how list_segments relates to list_sequences, list_subscribers, or the other list_* tools.

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?

There is no guidance on when to use this tool rather than another list tool, nor any prerequisites or exclusions. 'Reads account data' describes a trait, not a selection condition, so the agent is left to infer usage entirely from the name and siblings.

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