ruyi_set_fingerprint

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It states that fingerprint spoofing is applied to the current page and mentions the need to configure hardware fingerprint randomization at page creation, which is useful. However, it does not disclose whether the settings persist across navigations, how to reset them, or any potential side effects on page behavior. This lack of reversibility/persistence information is a notable gap for a mutation tool.

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 sentences long and front-loads the primary purpose. The first sentence states the main action, and the second adds a useful contextual note about hardware fingerprint randomization. Every word earns its place; there is no redundancy or fluff.

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?

Given the tool's complexity (10 parameters, nested objects), the schema carries most of the explanatory weight. The description provides a clear high-level overview and adds the limitation about hardware fingerprint randomization requiring configuration at page creation. It does not explain the interaction between this tool and sibling emulation tools, but the current page scope is stated, making it reasonably complete. A 5 would require more explicit guidance on when to use this combined tool vs. individual ones.

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 schema already provides highly detailed descriptions for all parameters (90% coverage), so the description does not need to explain them individually. The description adds a high-level summary of the parameter categories but contributes little beyond the schema. It does mention the 22-dimensional hardware fingerprint randomization, but that is not a parameter of this tool, so it adds marginal semantic value.

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 clearly states the tool's function: apply fingerprint spoofing to the current page. It enumerates the specific spoofable dimensions (geolocation, timezone, language, UserAgent, viewport, outer window, screen, CSP bypass), distinguishing it from single-purpose sibling tools. The verb 'apply' and resource 'current page' are specific and 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?

The description implies this is a combined tool for setting multiple fingerprint dimensions independently, which suggests it can be used instead of individual emulation tools. However, it does not explicitly state when to prefer this over dedicated siblings like ruyi_emulate_geolocation, nor does it provide exclusions or alternative recommendations. The context is clear but the guidance is implicit rather than explicit.

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