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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the read-only nature is covered. The description adds only the 'for a tag' scope and 'in your account' context, but does not disclose pagination behavior or filter mechanics. No contradiction with annotations.

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 a single front-loaded sentence with no fluff, though the title and description repeat 'List tag assignments' which is slightly redundant.

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?

This is a 7-parameter list tool with no output schema. The description is too minimal: it lacks pagination details, filter parameter semantics, return format expectations, and any differentiation from related assignment list/audit tools.

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 has 7 parameters with 0% description coverage. The description only implies tagId via 'for a tag' and gives a generic 'filter' mention, leaving page, size, orderBy, resourceType, and trace/request IDs without meaningful explanation.

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 uses a specific verb and resource: 'List and filter all existing assignments for a tag in your account.' It clearly distinguishes from create/deleteAssignment and the singular retrieveAssignment, though it does not explicitly name alternative 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?

No guidance on when to use this tool instead of siblings like retrieveAssignment or retrieveAssignmentsAuditsList. It does not provide exclusions, prerequisites, or recommended scenarios.

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