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

Annotations provide no helpful hints (readOnlyHint false, destructiveHint false, etc.), so the description carries the burden of explaining side effects, requirements, and outcome. It merely says 'apply' without stating whether the application replaces existing effects, is reversible, or requires specific conditions. The term 'quarantined' is vague and does not clarify behavior.

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 sentence with no filler, front-loading the key verb 'apply' and the object. It is appropriately brief for a two-parameter tool with schema-covered fields.

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?

The description is minimal and does not cover behavioral context such as whether the action is reversible, if it conflicts with other effects, or what the return value indicates. With no output schema and minimal annotations, the agent lacks critical information to safely invoke the tool. The room parameter suggests a location requirement that is not explained in the description.

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 both room and itemId are already documented in the schema. The description adds no additional parameter meaning beyond what the schema provides, and it does not clarify the relationship between the two parameters (e.g., whether itemId must belong to the given room). Baseline 3 is appropriate given full schema coverage.

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 states a clear verb ('apply') and resource ('held effect or style from your pocket'), distinguishing it from sibling tools like 'pocket' (list) and 'drop' (remove). However, the name 'open' conflicts with the description's 'apply' and the title says 'open a pocket item', creating mild ambiguity about the exact action. It is specific enough to understand the core purpose.

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 explicit guidance on when to use this tool versus alternatives. It does not mention prerequisites (e.g., must have an item in pocket, must be in a room) or when not to use it. The schema implies room and itemId but the description does not clarify the selection criteria relative to sibling tools like 'change_style' or 'reset_style'.

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