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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds the exact response shape, the echo behavior, and the intended networking context (verifying connectivity), which goes beyond the annotations. It does not cover failure/timeout behavior, but for a simple liveness check this is sufficient.

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?

Two sentences, zero waste. The response format is front-loaded, followed directly by the use case. Every word earns its place and no unnecessary elaboration is present.

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 a tool with one optional parameter seven and no output schema, the description fully covers the return value, the optional argument behavior, and when to invoke it. Nothing an agent needs to call this correctly is missing, and the annotations cover the safety profile.

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% and the single optional echo parameter is already well-described in the schema as 'Optional string echoed back in the response — useful for confirming round-trip integrity.' The description essentially restates this same fact, adding no meaningful semantic value beyond the schema, so the baseline 3 is appropriate.

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 a specific behavior: returns a JSON payload with "pong", "time", and optional "echo" fields. This clearly distinguishes it from sibling tools like prism_config, prism_info, and prism_metrics, which are configuration/information tools, while prism_ping is a connectivity liveness check.

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 explicitly says to use it to verify connectivity through the gateway before pointing it at an upstream MCP server. This provides a clear when-to-use context, though it does not mention exclusions or name alternative tools explicitly, 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.