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

With no annotations, the description carries the full behavioral burden. It usefully implies that an authenticated merchant context is required, which is real added context. It does not say whether the call is side-effect free, what it returns, or what failure looks like.

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?

A single front-loaded sentence with zero filler. Nothing is repeated from the title, and the authenticated-merchant qualifier is the most useful part of the statement.

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 no-arg health-check tool with a fully covered (empty) schema, the description is nearly sufficient. The only real gap is the return value — with no output schema, the agent is not told whether it gets a boolean, a status string, or the merchant identity.

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 takes zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies; the description correctly avoids inventing inputs.

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?

States a specific verb ("Confirm") and resource ("Qrblox MCP server is reachable") and adds a scope qualifier ("for the authenticated merchant"). It is clearly distinguishable from the CRUD/analytics siblings, though it does not explicitly name what it is not.

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?

Usage is only implied by the verb "Confirm" — an agent can infer this is a connectivity/preflight check, but the description gives no when-to-use condition, no prerequisites, and no alternatives to compare against. No explicit exclusions are stated.

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