Update Legend Items

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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered structurally. The description only adds generic boilerplate ('返回可验证的结构化结果；写入和路径限制以服务能力为准') that names no concrete behavior, side effect, or failure mode; it does not contradict the annotations.

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?

It is short, but every sentence is filler: a restatement of the title plus generic disclaimers. Nothing is front-loaded that helps an agent decide or act, so brevity here reflects under-specification rather than efficient structure.

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 mutating tool with four required parameters, one nested object, and 0% schema coverage, the description provides no information about what changes, how layer_visibility maps legend entries to visibility, or what constraints apply. The presence of an output schema excuses explaining return values, but not the near-total absence of invocation-relevant detail.

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 description coverage is 0% and the description supplies no parameter information at all, leaving aprx_path, layout_name, legend_name, and the nested layer_visibility map entirely undocumented in both places. This is a serious gap for a tool with a nested-object parameter.

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 essentially restates the tool name/title ('更新update legend items') without adding scope, target, or distinguishing detail from the many sibling layout/legend tools. It identifies neither what a legend item is nor what aspects get updated.

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 when-to-use guidance, no mention of prerequisites (e.g., an open project or layout), and no routing to alternatives such as arcgis_pro_list_layout_elements or arcgis_pro_update_layout_text_element. The reader gets no context for selecting this tool over siblings.

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