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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the repeated 'Read-only' adds nothing, though 'free' contributes useful cost/rate-limit context. The description does not disclose what the check yields (boolean, status, fetched card contents) or how redirects/missing files are reported, leaving the agent guessing at the outcome shape.

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?

One front-loaded sentence naming the check and its exact paths, plus a two-word cost/safety tag – no filler. The mixed Spanish/English label is the only thing that makes the reader pause.

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, read-only probe with no output schema and full annotation coverage, the definition supplies the target endpoints, the input expectation, and the cost. Little else is needed for an agent to invoke it correctly.

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?

There is a single parameter ('url', 'Domain or https URL') at 100% schema coverage, so the schema already does the work and baseline 3 applies. The description adds no detail on whether a bare domain is normalized, whether a full https URL must be well-formed, or whether subpaths are ignored.

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?

States a concrete verb (check) and resource (the A2A agent card at /.well-known/agent-card.json or /.well-known/agent.json), which distinguishes it from path-adjacent siblings like bursia_check_agents_json and bursia_check_llms_txt. It never names those siblings explicitly, and the Spanish phrase 'Ficha de agente A2A' is mildly jarring next to the English rest of the text, but the endpoints make the scope 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?

'Check one agent-readiness item' implies this is a single-item probe that feeds a broader readiness assessment, and the sibling bursia_agent_readiness exists for the aggregate case, but neither is stated. There is no when-not guidance, no note on which of the two well-known paths takes precedence, and no mention of prerequisites such as the site needing to be publicly reachable.

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