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

The verb 'List' implies a read-only, non-mutating operation, but the description does not disclose connection/auth expectations, pagination, or what the returned items look like. With no annotations present, the description carries the full behavioral-transparency burden and only partially meets it.

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 filler. Every word contributes meaning ('optional', 'A2A work', 'addressed to this agent'), though 'optional' could be clearer.

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 list tool with one optional parameter, the description plus the rich schema note on connection is mostly sufficient to select and invoke it. The lack of an output schema and any description of return shape leaves a minor gap, but not enough to impair calling the tool.

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 input schema already describes the only parameter, connection, including its origin, purpose, and security handling, so schema coverage is effectively 100%. The tool description adds no parameter-level information, placing it at the baseline 3.

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 ('List') and a clear resource ('optional A2A work addressed to this agent'), which conveys the tool's output and scope. It is distinguishable from siblings like a2a_task_update and a2a_enable by the list action and the 'addressed to this agent' qualifier, though 'optional' remains slightly ambiguous and no sibling is named explicitly.

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 implies when to use the tool: when the agent needs to see incoming optional A2A work addressed to it. However, it offers no explicit comparison to alternatives such as a2a_task_update or task_context_list, nor any 'when not to use' guidance.

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