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

With no annotations, the description carries the burden of disclosing behavior. It states that the tool returns server status and supports an optional echo, which conveys read-only behavior and basic functionality. However, it lacks detail about response format, possible failure modes, or whether echo alters the response.

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 extremely concise, consisting of two short sentences that immediately state the tool's purpose and behavior. No filler or redundant information 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?

Given the tool's low complexity, a single optional parameter, and no nested structures, the description covers the essentials. It does not describe the exact shape of 'server status', but for a health check this is a minor gap, and the description is sufficient for an agent to understand and invoke the 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 schema fully describes the sole parameter `echo` as an optional string to echo back, and the description confirms this behavior. Since schema coverage is 100%, the description adds no substantial semantic value beyond the schema.

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 identifies the tool as a health check that returns server status, which is a specific resource and verb. It distinguishes from the sibling web search tools by indicating this is a system-level status endpoint, though it does not explicitly contrast with alternatives.

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 context is implied: use this when you need server health or status. No explicit when-to-use or when-not-to-use guidance is provided, nor are alternatives mentioned, but the tool's purpose is straightforward enough that the description is adequate.

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