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

With no annotations, the description carries full responsibility for behavioral disclosure. It only says the event is marked as handled, but does not explain effects on the queue, idempotency, required permissions, what read_token is for, or failure behavior. This is a significant gap for a state-changing operation.

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, front-loaded sentence with no fluff. However, it is under-specified for a tool with three required parameters and no annotations; brevity comes at the cost of missing necessary behavioral and parameter context.

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?

With no output schema, no annotations, and no parameter descriptions, the tool definition is incomplete. The agent is left without the meaning of read_token, the distinction between address_id and event_id, the effect of acknowledgment, or what response to expect.

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 0% and the description adds no meaning for any parameter. The raw parameter names suggest some purpose, but the description does not explain address_id, event_id, or especially read_token, nor how they relate to each other.

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 uses a specific verb ('Mark') and a specific resource ('a queued event') with a clear outcome ('as handled'). The action is distinct from sibling tools like poll_events or create_return_address, so an agent can tell what this tool does even without extra context.

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 phrase 'queued event' implies this tool is used after handling an event, but there is no explicit when-to-use, when-not-to-use, or alternative guidance. It offers implied usage context rather than explicit routing among sibling tools.

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