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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered. The description earns credit for adding domain context beyond structured fields: it glosses each status ('in_review with our team', 'submitted to the carriers') and states the consequence rule that a toll-free number cannot text the public until verified.

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, front-loaded with the action and resource, and the parenthetical status list is compact rather than redundant because it expands the enum meanings. Slight bloat from re-listing enum values already in the schema.

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?

There is no output schema, so the description should say at least roughly what a returned verification record contains or how paging works; it only implies a status field. Adequate for routing, but thin for building a correct paginated call.

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 coverage is only 33% (only cursor is documented), so the description needs to compensate. It adds meaning for the status values but says nothing about limit, the default of 25, the 100 cap, or pagination semantics, leaving two of three parameters unexplained across both sources.

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?

Specific verb (list) plus resource (toll-free verifications) and an enumeration of the statuses the records can carry. It is distinguishable from the singular get_toll_free_verification by the plural 'list', though the description never says so explicitly.

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?

Listing implies browsing/enumerating, but the description never states when to use this versus get_toll_free_verification for a single record, nor how to combine the status filter with paging. Usage must be inferred from the name.

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