set_fixed_position

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

No annotations are provided, so the description carries the behavioral disclosure burden. It discloses the core effect (pinning during scroll) but does not mention potential side effects such as overriding constraints, layout behavior, stacking order, or prerequisites like a scrollable parent. Adequate but minimal.

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?

A single, front-loaded sentence that states the action, the effect, and relevant examples. Every word contributes to understanding the tool, with no filler or 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?

The tool is simple with only two parameters and no output schema, and the description plus schema provide enough information for correct invocation. Minor gaps like the default position when omitted or interaction with layout constraints keep it from being fully complete.

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%, so the schema already documents both parameters adequately. The description adds no extra parameter-level meaning beyond what the schema provides; the position parameter is left entirely to the enum values.

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?

Uses a specific verb ('Pin') with a clear resource ('layer') and a concrete behavioral outcome ('stays fixed during scroll'). The examples ('sticky nav, floating button') make the tool's purpose immediately obvious and distinguish it from layout/constraint siblings.

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?

Provides clear context for when to use the tool: when a layer should remain fixed during scrolling. It also gives concrete use cases, but does not explicitly mention alternatives or when not to use it, so it stops short of a perfect score.

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