configure_credentials

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

Discloses security details (AES-256-GCM encryption, OS keychain) beyond destructiveHint annotation. Does not contradict annotations. Lacks info on error behavior or validation, but still informative.

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 concise sentences with no redundant information. Every sentence adds value: purpose, prerequisite, security detail.

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?

Adequately covers the tool's role, prerequisite, and security. No output schema needed. Could mention validation or error handling, but not required for basic understanding.

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?

Schema covers all parameter descriptions (100% coverage). Description adds no additional semantics beyond the overall purpose. Baseline score of 3 is appropriate.

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?

Clearly states 'Set up or update your LibreLinkUp account credentials for data access' and distinguishes from sibling tools by noting it is a prerequisite for glucose reading tools.

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 says 'Required before using any glucose reading tools', providing clear when-to-use context. Does not specify when not to use, but the context implies one-time setup or credential update.

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