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freema

Firefox DevTools MCP

by freema

navigate_page

Navigate the active browser tab to a target URL for loading web pages during development or testing.

Instructions

Navigate selected tab to URL.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesTarget URL
Behavior2/5

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

No annotations provided. The description only states it 'navigates' but lacks details on side effects (e.g., page load, history push, blocking behavior). Minimal disclosure for a mutation tool.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Single sentence, no wasted words. However, being too brief reduces informativeness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Lacks details on return value (no output schema), error handling, async behavior, or state changes. For a tool that modifies page state, this is insufficient.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% and describes 'url' as 'Target URL'. The description 'Navigate selected tab to URL' adds no extra meaning beyond the schema. Baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description 'Navigate selected tab to URL.' uses a specific verb (navigate) and resource (selected tab) with clear target (URL). It distinguishes itself from siblings like navigate_history (history navigation) and new_page (creating a new tab).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool vs alternatives such as navigate_history, new_page, or click_by_uid. Prerequisites like having a selected tab are not mentioned.

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

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