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

The description adds specific behavioral detail beyond what annotations already provide: the item is retained, its status becomes 'dismissed', and it is not deleted. It also discloses the GM-only permission requirement, which is not present in annotations or schema. The description aligns with destructiveHint=false and idempotentHint=true, with no contradiction.

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 extremely concise: two sentences, no filler, and every element earns its place. The action is front-loaded, followed by the retention behavior and the GM-only restriction. This is efficient and easy for an agent to parse.

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?

For a simple one-parameter tool with full schema coverage, annotations, and an output schema present, the description covers the action, the state change, the non-destructive nature, and the required role. Nothing essential is missing for correct invocation.

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%, and the single parameter itemId is already described as the Mongo _id of the inbox item. The description does not add further parameter-level detail, but since the schema fully documents the parameter, no additional compensation is required. 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 states a specific verb and resource: 'Mark an inbox email dismissed'. It also clarifies the purpose (misdirected mail, noise) and distinguishes the action from deletion by adding 'retained with status dismissed, not deleted'. This is clear and differentiates the tool from related PBEM email operations.

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 description gives clear context for when to use the tool (misdirected/noise emails) and an access restriction ('GM-only'). It does not explicitly name alternative tools like play_resolve_pbem_email or state when not to use it, but the context is sufficient for an agent to make a reasonable choice.

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