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

readOnlyHint already marks this safe; the description adds substantial value beyond that: pricing behavior ($0.005 per request, $0.0002 per record, $0.50 cap), included plan tiers, an estimate endpoint, and the return contents ('agent score + band alongside the Kin Score'). No contradiction with annotations.

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 dense but efficient: the 'UNDERSTANDING' category and scope are front-loaded, the examples earn their place, and pricing is relevant for cost-sensitive calls. It is slightly long, but no sentence is wasted.

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 an 8-parameter tool with no output schema, the description covers the core result shape, filter semantics, and pricing. It could be more complete on alternate sibling routing and the exact return structure, but the schema covers most parameters and the main behavior is well specified.

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 75%, so the description still carries some weight. It adds real semantics for the two primary filters — has and missing — with worked examples and implicit AND behavior. It does not explain page or limit, but those are largely self-evident from schema defaults and constraints.

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 a specific action — 'Rank providers by agent readiness' — over a clear resource ('the agent-readiness leaderboard across the whole catalog'), and distinguishes itself from sibling find_agents or get_agent_readiness by emphasizing whole-catalog ranking and cohort filtering with has/missing.

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?

It gives clear context and concrete use cases: has='mcp_server,protected_resource_metadata' is the OAuth-capable MCP cohort; missing='agent_card' is the addressable market for a fix. It does not explicitly name alternatives or say when not to use this tool, so it stops short of a 5.

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