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

The description goes well beyond the annotations by revealing that the first enable mints a unique inbound address, that subsequent enables preserve it, and that the return block contains the address players CC. It also discloses the GM-only access restriction. No contradiction with the idempotentHint annotation.

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?

Three dense sentences with the core purpose front-loaded offense, followed by the most decision-relevant behavior and access restriction. Every sentence adds value with no filler.

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 one-parameter tool with a rich output schema and annotations, the description provides the required accessibility role, idempotence behavior, return-value context, and parameter context. 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?

The schema already fully documents the single parameter as the Mongo _id of the play campaign, so the description does not need to add much. It only reinforces that the action targets a campaign, which is adequate given 100% schema description 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 precise action ('Enable the play-by-email inbox') on a clear resource ('a campaign') and adds distinctive details about address minting. This distinguishes it from related siblings like play_disable_pbem_inbox and play_regenerate_pbem_address.

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?

It clearly specifies that this is a GM-only operation and describes what happens on repeated enables. It does not explicitly compare against sibling PBEM tools such as play_regenerate_pbem_address or play_consume_pbem_emails, but the intended invocation context is clear.

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