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freema

Firefox DevTools MCP

by freema

get_firefox_info

Read-only

Retrieve the current Firefox instance's configuration, including binary path, environment variables, and output file location, to diagnose or verify browser setup.

Instructions

Get information about the current Firefox instance configuration, including binary path, environment variables, and output file location.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

Annotations declare readOnlyHint=true, and the description confirms a read operation by listing what info is retrieved. No contradictions. The description adds context beyond annotations by specifying the data categories.

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

Conciseness5/5

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

Single sentence, concise, front-loaded with the core action 'Get information'. No unnecessary words.

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

Completeness4/5

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

For a simple read-only config tool with no parameters and no output schema, the description is sufficient. It covers the purpose and output categories, though more detail on return format could improve completeness.

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

Parameters4/5

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

Tool has zero parameters, so description need not add parameter meaning. Baseline 4 applies; the description appropriately omits parameter details.

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?

Description clearly states tool retrieves Firefox configuration info and lists specific items (binary path, env vars, output file location). This distinguishes it from sibling tools like get_firefox_output and actions like fill_form_by_uid.

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

Usage Guidelines3/5

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

Description does not provide explicit guidance on when to use versus alternatives (e.g., get_firefox_output). Usage is implied by the read-only nature, but no exclusions or context for when not to use.

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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