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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered structurally. The description adds no behavioral context beyond creation scope — it does not mention the idempotency-key replay behavior or what happens on a duplicate name, which would be the highest-value addition for a mutating tool.

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 semicolon-joined sentence with zero filler. The trigger condition comes first and the alternative-tool pointer follows, which is the right ordering for an agent scanning for a match.

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?

An output schema exists, so return values need not be explained, and all parameters are covered by the schema. For a simple three-parameter create tool with full annotations, the only meaningful omission is what the idempotency key buys the caller in practice.

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%, so all three parameters (name, category, idempotencyKey) are already documented in the schema, including the enum values. The description only echoes the category vocabulary and adds no constraints or format guidance beyond it — baseline 3 is appropriate.

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 names a specific verb and resource ('create a … list') and immediately scopes which kinds exist ('shopping, to-do, or miscellaneous'), which matches the category enum. It distinguishes the tool from the list-write siblings by noting they handle 'later changes', though it does not address the other create_* tools in the family.

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?

'Use this when you need to create a shopping, to-do, or miscellaneous list' gives a positive trigger condition, and the clause 'use focused list-write tools for later changes' rules out using this tool for subsequent edits. No explicit exclusions for e.g. batching or duplicate names, but the create-vs-modify boundary is clear.

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