setup_credentials

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

Annotations already provide destructiveHint, idempotentHint, and openWorldHint. The description adds value by mentioning encryption and secure storage, and explicitly states credentials are never stored in plain text or config files. However, it does not disclose what happens on existing credentials or potential side effects of the openWorldHint, so transparency is only moderately improved.

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?

Extremely concise: two sentences, no wasted words. The critical information (what the tool does and a key security guarantee) is front-loaded and easy to parse. Every sentence earns its place.

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?

For a simple credentials setup tool with two parameters and no output schema, the description covers the basic action and security. However, it lacks details on success/error behavior (e.g., confirmation, error messages) and does not mention how the openWorldHint affects external systems. Completeness is adequate but not thorough.

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 coverage is 100%—both parameters (email, password) are already well-described in the input schema. The description adds no additional semantic information beyond what the schema provides. 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?

The description uses a specific verb 'Configure' and clearly identifies the resource 'Diabetes:M login credentials' and the action. It distinguishes from sibling tools like check_credentials (verify) and clear_credentials (remove), making the purpose unambiguous.

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?

No explicit guidance on when to use this tool versus alternatives. For example, it doesn't mention that credentials should be set before using other tools, nor does it clarify behavior when credentials already exist (e.g., overwrite or error). The idempotentHint implies safe reuse, but the description does not convey this.

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