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

The annotations already declare readOnlyHint=true and openWorldHint=false, and the description adds useful behavioral context: it uses the Moving Load Wizard's own layout engine and requires no model. It also says it lists the case groups each loading needs, though it does not describe defaults or invocation edge cases.

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 front-loaded with the action and resource, and it uses only two sentences. The long parenthetical repeats loading types already enumerated in the schema, but the content is still purposeful for a standards-based engineering tool.

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?

With no output schema, the description still explains that the tool lays out the cross-section and lists the case groups each loading needs. It also clarifies that no model is required, though it does not explain what happens when lanes or section are omitted.

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 100%, and the schema already explains the picked loading values and section fields. The description names broad concepts like lanes, footways, and strips but adds no syntax, defaults, or parameter behavior beyond the schema.

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 and resource: 'Lays out CS 454 notional lanes, remaining areas, footways and strips on a carriageway cross-section.' It also distinguishes the tool from cs454_moving_loads by explaining that it needs no model and is used before that tool.

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?

It explicitly says to use the tool to answer layout questions or to choose inputs before cs454_moving_loads, and notes that it needs no model. That gives clear sequencing and an alternative, but it does not explicitly state when not to use it or name other alternatives such as ec_lane_layout.

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