debug_localhost

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

No annotations are provided, so the description carries full burden for behavioral disclosure. It only says 'launch' and 'automatically connect', without noting side effects like opening a visible browser window, potential port conflicts, resource usage, or whether the connection is ephemeral. This is minimal for a tool with side effects.

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 a single, focused sentence that clearly states the action and purpose with no redundant words. It earns its place 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 tool with one required parameter and no output schema, the description covers the core purpose. However, without annotations, it lacks details on success/failure behavior, return values, or the debugging connection mechanics. It is adequate but not comprehensive.

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% with each parameter (port, path, protocol, debugPort, executablePath) described. The description adds no additional parameter semantics beyond 'localhost URL', so a baseline 3 is appropriate.

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 clearly states the tool launches a browser with a localhost URL and automatically connects for debugging. It distinguishes itself from siblings like browser_launch (launch only) and browser_connect (connect only) by combining both actions with a debugging focus.

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 description implies usage for localhost debugging but does not explicitly state when to use this tool over alternatives (e.g., browser_launch + browser_connect) or mention any exclusions or prerequisites. The debugging context is evident, but no clear guidance is given.

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