Open sign-in form

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

No annotations are provided, so the description carries the burden of disclosing behavior. It does clarify that the tool displays an interactive form rather than performing authentication, which is useful. However, it does not disclose side effects, what happens after display, or whether any state changes occur.

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 one short, front-loaded sentence with no filler. Every word adds meaning, and the sentence structure is immediately scannable for an agent.

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, parameterless display tool, the description is mostly complete: it names the action and UI element shown. An output schema exists, so return-value details are presumably covered there. The main omission is usage context, but that is already reflected in the usage-guidelines score.

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 has zero parameters and an empty input schema, so there is no parameter semantics burden. The baseline for 0-parameter tools is 4, and the description reasonably does not need to document inputs.

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 verb, 'Display', and a specific resource, 'an interactive username and password form'. This both matches the tool name and disambiguates it from a sign-in/authentication action. There are no sibling tools, so no differentiation is needed.

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?

The description gives no guidance on when to call this tool or when to avoid it. It only says what the tool does; there is no mention of prerequisites, context, or alternatives. With no siblings, some usage context would still help the agent decide when displaying a sign-in form is appropriate.

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