MCP-A2A-Gateway

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

With no annotations provided, the description carries the full burden and does well by disclosing key behavioral traits: it's a read-only operation (implied by 'Lists'), returns structured data (list of dictionaries with URL and AgentCard), and includes a dummy parameter for compatibility. However, it lacks details on potential errors, rate limits, or authentication needs.

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 front-loaded with the core purpose, followed by clear sections for Args and Returns. It avoids unnecessary fluff, but the explanation of the dummy parameter could be slightly more concise without losing clarity.

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?

Given the tool's low complexity (1 parameter, no output schema, no annotations), the description is reasonably complete: it explains the purpose, parameter usage, and return format. However, it could improve by addressing potential edge cases or linking to sibling tools for broader context.

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 description coverage is 0%, but the description compensates by explaining the single parameter 'dummy' as a compatibility requirement to pass an empty string. This adds meaningful context beyond the schema's basic type information, though it doesn't cover all possible parameter nuances.

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 clearly states the specific action ('Lists all A2A agents') and resource ('currently registered with the bridge server'), distinguishing it from siblings like register_agent (creation) or unregister_agent (deletion). It explicitly mentions what is returned (URL and AgentCard information), making the purpose unambiguous.

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 usage by stating it returns all registered agents, but does not explicitly guide when to use this tool versus alternatives like get_task_list or send_message. No exclusions or prerequisites are mentioned, leaving usage context somewhat open-ended.

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