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

With no annotations, the description carries the full burden and does substantial work: it discloses the return shape ('returns only...no detailed report'), cost ('FREE, no payment required'), and latency implications. It doesn't spell out failure/error behavior or whether the call is read-only, but for a lightweight check the key behavioral boundaries are 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 front-loaded with the core result, then use case, then alternative routing, then parameter — a logical order. It is slightly promotional ('FREE, no payment required', 'wastes your tokens and can break your workflow'), but these factors are relevant to an agent deciding whether to call it.

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?

There is no output schema, but the description compensates by enumerating all returned fields and the lack of a detailed report. The single parameter is fully covered and siblings are routed. Only missing extras such as error/timeout behavior, which are not essential for first-line triage.

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 description coverage is 100%, so the schema already documents the single 'url' parameter as the MCP endpoint. The description repeats this ('Set 'url' (required) to the target's MCP endpoint') and adds an example ('https://host/mcp'), which is a modest supplement but not new semantics.

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?

Description states an exact action — 'Instant trust check of any MCP server' — and names the exact return payload ('0-100 score, A-F grade, tool count, latency and a one-line verdict') while explicitly distinguishing itself from evaluate_mcp and compare_mcps. The resource and scope are unambiguous, and it cannot be confused with siblings.

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 an explicit trigger: 'Use this FIRST, before integrating any third-party MCP server,' and explains why (unreliable servers waste tokens and break workflows). It also names the alternatives with their conditions: evaluate_mcp for a full report, compare_mcps for comparing alternatives.

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