setup_extension

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

With no annotations, the description carries the burden and does disclose two useful traits: it opens the extension directory and it does not modify project files, plus it targets both Chrome and Firefox. However, it doesn't clarify whether it launches a browser process, blocks for user action, or what output the agent gets, leaving meaningful side-effect ambiguity.

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?

Two tight sentences with no filler, and the core purpose is front-loaded before the behavioral detail. The only redundancy is restating 'instructions' and 'opens the directory,' which is minor.

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 zero-parameter, no-output-schema setup tool, the description gives enough to understand what it does and its non-invasive nature, though the side-effect profile (directory opening, waiting on user) could be more explicit given no annotations exist.

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 has zero parameters and full description coverage, so there is nothing for the description to compensate for; the baseline of 4 applies.

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 names a specific verb (install) and resource (the browser extension for widget injection), which clearly distinguishes it from siblings like install_widget and get_widget_snippet. It could be sharper about the explicit contrast with install_widget, but the resource difference is unmistakable.

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 phrase 'without modifying project files' implies a usage constraint and context (a non-invasive setup path), but there is no explicit when-to-use or when-not-to-use guidance and no mention of alternatives among the many sibling tools.

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