CGM Libre status

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

With no annotations, description provides good behavioral context: it reports configuration (read-only). Lists what fields are reported. Could mention if external calls are made, but overall transparent for a status check.

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, front-loaded with key information, no wasted words. Efficient and structured.

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 zero parameters and no output schema, the description provides sufficient context about what the tool returns. Could mention response format or error cases, but listing specific config items is adequate.

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?

Zero parameters, so baseline 4 per guidelines. Schema coverage is 100% trivially, description adds no extra param info needed.

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 it reports FreeStyle Libre configuration, listing specific items (region, credentials, patient id, live/mock reads). It distinguishes from siblings by advising to use before calling glucose tools with CGM_PROVIDER=libre.

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?

Explicitly states 'Use this to confirm the Libre path is wired before calling glucose tools with CGM_PROVIDER=libre.' This gives clear when-to-use guidance and implies not to use for actual glucose data.

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