open_model

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

Annotations already declare readOnlyHint=false and destructiveHint=true, and the description adds nothing about why opening is destructive (presumably it replaces the current document and discards unsaved work). It also omits any note about path resolution or failure modes. It does not contradict the annotations, but it contributes no behavioral context beyond them.

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?

One short, front-loaded sentence with no filler. It is appropriately sized, though the brevity comes at the cost of the missing behavioral detail noted elsewhere.

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 document-replacing mutation with a destructive annotation, no output schema, and an undocumented parameter, the description is too thin. An agent cannot tell whether current unsaved work is lost, what path format is required, or what happens on failure.

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 0% and the single parameter carries no description. The mention of a '.skp file' implies the path targets a SketchUp file, which is marginal added meaning, but nothing is said about absolute vs relative paths or validated extensions.

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?

States a specific verb (open) and resource (.skp file in SketchUp), which is enough to separate it from save_model and new_model by inference. It does not explicitly name which sibling it complements or replaces, so it falls short of a 5.

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?

No when-to-use guidance, no prerequisites, and no mention of alternatives such as new_model or install_sketchup_bridge. An agent must infer that this is the entry point for loading an existing project.

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