mah_sign_in

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

The annotations already disclose readOnlyHint=false and destructiveHint=true, so the safety profile is covered. The description adds useful behavioral context about the verification-code branch and instructing the user, but it does not explain side effects such as session creation, state changes, or what happens after successful authentication.

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 two tight sentences, front-loading the main action and then the conditional verification detail. Every sentence earns its place with no redundant wording.

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 zero-parameter sign-in tool with no output schema, the description covers the main action and the important verification-code branch. It does not explain post-sign-in state or how it relates to subsequent sibling calls, but it is largely complete for calling the tool correctly.

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 tool takes zero parameters, so there are no parameter semantics for the description to clarify. Per the baseline for zero-parameter tools, a 4 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 states a specific action and target: 'Sign in to MyAtriumHealth server-side.' It clearly distinguishes the core sign-in operation from sibling tools like mah_auth_status and mah_verify_code, though it does not explicitly name those 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?

It implies when to call the tool by describing the sign-in flow, and it gives a conditional next step if a verification code is required. However, it does not state when to use this versus mah_auth_status, mah_verify_code, or mah_send_verification_code, nor does it provide exclusions or prerequisites.

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