x_open_home

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

No annotations exist, so the description carries the full burden. It usefully discloses one behavioral trait — the call blocks until a 'settled X page state' — which tells the agent it is a synchronizing navigation step. But it says nothing about authentication requirements, failure/timeout behavior, or what a 'settled' state means in practice.

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 with no filler. The action and its completion semantics are stated together efficiently.

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 parameter-less navigation tool with no annotations and no output schema, the description covers the essential action but omits the outcome an agent would want — what state or handle results from the call, and how failures surface. Adequate minimum, but not fully self-sufficient.

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, which is the baseline-4 case. There is nothing for the description to clarify beyond what the empty schema already conveys.

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 gives a specific verb ('Open') and a specific resource ('the X home timeline'), so an agent can distinguish it from x_open_notifications, x_open_search, or x_open_profile. It does not, however, clarify how it relates to the similarly named sibling x_get_timeline, leaving a real ambiguity unaddressed.

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?

There is no explicit guidance on when to use this tool versus the many other open/get tools (x_get_timeline, x_open, x_open_search). Usage is only implied by the word 'Open'. No prerequisites or alternatives are named.

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