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

The annotations already provide readOnlyHint, idempotentHint, and destructiveHint, so the safety profile is covered. The description adds specific detail about what is displayed (platform and adapter versions), which goes slightly beyond the bare semantics, but it does not disclose additional behavioral traits such as latency, error modes, or prerequisites. Since annotations cover the main concerns, a score of 3 is appropriate.

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 a single, front-loaded sentence with no filler words. It perfectly conveys the tool's purpose in the minimum possible space, earning full marks for conciseness and structure.

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 the tool's extreme simplicity (no parameters, no output schema, read-only behavior already declared via annotations), the description fully covers the necessary context. It states what the tool does, and the annotations handle safety and idempotency. There is no missing information that would hinder an agent's ability to correctly select and invoke 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?

The tool has zero parameters, and the schema coverage is 100% (essentially no parameters to document). The description does not need to explain parameter semantics, so the baseline of 4 applies. The description correctly adds no redundant parameter details.

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 the tool's function: 'Show the current MCP platform and adapter versions.' It uses a specific verb (show) and identifies the resource (platform and adapter versions), and it is easily distinguished from sibling tools like authenticate, connect, or report_bug, which have entirely different purposes.

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 implies when to use the tool (when version information is needed) but does not explicitly mention alternatives or scenarios where it should not be used. For a simple, self-explanatory version-check tool, the usage context is reasonably clear from the description alone, but it lacks explicit guidance.

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