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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is fully covered without the description. The description adds only the workspace scope; it says nothing about whether results are paginated or how filtering affects the returned set.

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?

A single front-loaded sentence with zero filler, though its terseness means it carries no supporting context. It is efficient but borders on under-specification rather than optimized conciseness.

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?

With seven optional parameters enabling pagination, sorting, free-text search and structured filtering, the description never signals those capabilities, so an agent must open the schema to discover the tool is queryable. Annotations and schema fill the gaps, but the description alone is only minimally adequate.

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%: page, limit, sort, order, match, search and filters are all documented in the schema, including enum meanings and filter conditions. The description contributes no additional parameter meaning, so the baseline 3 applies.

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 and resource ('List sending domains') plus the scope 'in the workspace', which lets an agent distinguish it from get-domain or create-domain by name alone. It does not explicitly name those siblings, so it stops short of a 5.

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 listing verb plus pagination/filter parameters implicitly convey when to use it, and no exclusion or prerequisite is stated. There is no explicit pointer to get-domain for fetching a single domain or to the sibling list tools, leaving routing to inference.

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