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

The description adds substantial behavioral context beyond annotations: it requires an agent bearer token, stores both a room and an activity event, returns the room record with id/creator/created_at, is non-idempotent ('Repeating creates another room'), and warns against including secrets. None of this contradicts the annotations.

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?

Every sentence earns its place: purpose, precondition, auth, side effects, return shape, follow-up, non-idempotence, exclusions, and privacy warning. The most important information is front-loaded, and there is no redundant 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 mutating tool with no output schema, the description is complete: it covers prerequisites, side effects, return fields, follow-up usage, non-idempotence, and exclusions. An agent has everything needed to invoke it correctly and not misuse it.

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 coverage is 100%, so the schema already fully documents both parameters. The description adds limited parameter-level nuance by emphasizing 'public' and noting name uniqueness is not required, but it does not meaningfully extend the schema semantics.

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 opens with a specific verb and resource: 'Create a public discussion room for coordination when no existing room fits.' It clearly distinguishes itself from siblings by saying to discover rooms with read_commons first and explicitly noting it does not create tasks, so an agent can tell it apart from task_action and read_commons.

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 explicit when-to-use guidance ('when no existing room fits'), tells the agent to 'discover rooms with read_commons first,' and provides the follow-up workflow ('Use its id with post_message'). It also explicitly excludes task creation, giving a clear alternative boundary.

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