configure_credentials

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

The description discloses that credentials are stored securely and only on the local machine, a valuable privacy detail not available from annotations. It also hints that the tool can create or update credentials, but doesn't elaborate on validation or error behavior.

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 compact: two sentences that cover purpose, usage prerequisite, and security. It front-loads the main action and avoids redundancy.

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 no annotations or output schema, the description covers the core essentials: what it does, when to use, and a security property. It lacks details on outcomes or confirmation, but this is acceptable for a simple configuration 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 input schema covers all parameters with 100% description coverage, so the description adds no extra parameter semantics. The baseline of 3 applies since schema does the heavy lifting.

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 tool's function with a specific verb ('Set up or update') and resource ('LibreLink account credentials'), linked to data access. It distinguishes itself from sibling tools that retrieve glucose data, making its purpose unmistakable.

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?

It explicitly states that credentials are required before using any glucose reading tools, establishing a clear prerequisite. While it doesn't mention alternatives (there are none for credential setup), the context is strong enough to guide the agent.

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