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

No annotations are provided, so the description carries full burden. It discloses the behavioral trait of checking server liveness, which is useful context, but does not mention response format, timeout behavior, or error handling. For a zero-parameter tool with no annotations, this is adequate but leaves gaps in operational details.

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, efficient sentence that directly states the tool's function with zero waste. It is front-loaded and appropriately sized for a simple tool, making it easy to understand without unnecessary elaboration.

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 low complexity (0 parameters, no output schema, no annotations), the description is complete enough for its purpose. It clearly defines what the tool does, though it could benefit from slight elaboration on expected outcomes or usage scenarios to enhance agent decision-making.

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?

With 0 parameters and 100% schema description coverage, the baseline is 4. The description does not need to add parameter semantics, as there are no parameters to document, and it appropriately focuses on the tool's purpose without redundant information.

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 specific action ('Check if') and target resource ('Brian API server is alive'), distinguishing it from siblings like 'agent' and 'search' by focusing on health/availability testing rather than data operations. It uses precise language that conveys the exact function without ambiguity.

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 usage context (verifying server status), but does not explicitly state when to use this tool versus alternatives or provide exclusions. It suggests a diagnostic purpose, which gives clear context, but lacks explicit guidance on scenarios like pre-operation checks or troubleshooting steps.

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