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

Annotations already declare readOnlyHint, destructiveHint=false, and openWorldHint=false, so the description's 'Read-only' is largely redundant. It does add genuinely new behavior: the default sort key and direction ('warranty_until' ascending, soonest expiry first), the workspace scoping, and the return shape {items,total,has_more}. Missing are pagination limits beyond the schema max and any default values.

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 compact block with zero filler: scope and ordering are front-loaded, filters follow, and the return contract closes it out. Every clause conveys actionable 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?

There is no output schema, but the description explicitly declares the return shape {items,total,has_more}, and it covers ordering, scoping, filtering, and pagination for a zero-required-parameter list tool. An agent has everything needed to call it correctly on the first attempt.

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 0%, so the description carries the full burden and largely succeeds: it defines the meaning of all five parameters, including the precise semantics of 'expiring_within_days' (still-active only) which the bare schema name would not convey. It does not state defaults for limit/offset or whether 'query' matches across other fields, leaving a small gap.

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 the caller's tracked warranties'), plus the scope ('from their active workspace') and default ordering. It is clearly distinguishable from siblings like get_warranty_item, add_warranty_item, and delete_warranty_item without opening any schema.

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?

Gives clear conditions for each filter: 'active_only' for warranties still in force today, 'expiring_within_days' for still-active items expiring within N days, and 'query' for case-insensitive title matching. It does not explicitly route the agent to alternatives (e.g., get_warranty_item for a single record) or state when-not to use it, so it falls short of a 5.

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