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

With no annotations, the description carries the full behavioral burden and does disclose key behavior: a payment-required error without payment, a retry mechanism via _meta, an alternative auth path for registered agents, and a daily free quota. It does not describe the trust score's contents or response format, but the auth/error behavior is well covered.

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 compact and front-loads the purpose before the payment/auth mechanics. The jargon is dense, but every sentence carries operational information without 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?

Given no annotations and no output schema, the description covers the auth/payment flow reasonably well but leaves out what a trust score represents and how it differs from sibling tools. An agent can attempt the call, but lacks full context for interpreting or preferring this 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?

Schema coverage is 100% for agent_id, so the schema already documents the only declared parameter. However, the description instructs passing params._meta values even though the schema sets additionalProperties: false, which is a direct inconsistency that could mislead an agent about valid input.

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 states the specific resource and scope: 'Trust score for one agent.' It is clear what the tool returns, but it does not distinguish itself from siblings like get_agent_profile or verify_badge.

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 explains the payment and auth conditions for invoking the tool, but it does not say when an agent should use this tool versus the sibling tools. Usage is implied rather than explicitly guided.

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