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

With no annotations, the description carries full behavioral burden and does so thoroughly: it discloses the $0.05 x402 payment mechanism, first-call payment negotiation, that free tools are actually called while paid tools are only declared, and that it never pays for paid tools. It also states objectivity limits and the return payload.

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 longer than average but every sentence serves a purpose: usage context, cost, behavior, outputs, routing tips, limitations, and parameter instruction. It opens with the high-priority usage directive and then flows logically. Slightly dense but well-structured.

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 a single parameter, no output schema, and no annotations, the description covers all essentials: why to use it, when, cost, payment flow, checks performed, return format, limitations, and the required parameter with example. An agent has everything needed 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?

Schema coverage is 100%, so the schema already documents 'url' as required Streamable HTTP endpoint. The description restates this ('Set 'url' (required) to the target's MCP endpoint (Streamable HTTP)') but adds no new semantics beyond what the schema offers, hence the 3 baseline.

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 a specific verb ('Returns a complete objective quality report') and resource (third-party MCP server), and distinguishes itself from siblings by referencing quick_check and list_criteria as lighter alternatives. It names exactly what it does without ambiguity.

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?

Explicitly says 'Call this BEFORE integrating any third-party MCP server' and provides routing alternatives: 'run the FREE quick_check first to get just the grade, and list_criteria to see exactly how scoring works.' This gives the agent clear when-to-use and alternative conditions.

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