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freema

Firefox DevTools MCP

by freema

list_network_requests

List network requests from a Firefox browser session, with filters for URL, method, status, and time range, returning IDs for further inspection.

Instructions

List network requests. Returns IDs for get_network_request.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMax requests (default: 50)
sinceMsNoOnly last N ms
urlContainsNoURL filter (case-insensitive)
methodNoHTTP method filter
statusNoExact status code
statusMinNoMin status code
statusMaxNoMax status code
isXHRNoXHR/fetch only
resourceTypeNoResource type filter
sortByNoSort field (default: timestamp)
detailNoDetail level (default: summary)
formatNoOutput format (default: text)
Behavior2/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It only states that it returns IDs, but fails to disclose that it is a read-only operation, pagination behavior, or any side effects. The behavior is mostly assumed from the name.

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

Conciseness3/5

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

The description is very short (one sentence), which is concise but lacks completeness. It could be improved by adding more detail without becoming verbose. It front-loads the purpose but omits important context.

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?

Given 12 parameters, no output schema, and no annotations, the description is insufficient. It does not explain the output format, behavior of filters, or relationship to other tools like get_network_request. A more complete description would cover these aspects.

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%, so the input schema fully documents all 12 parameters. The description adds no additional semantic meaning beyond what the schema provides. Baseline of 3 is appropriate.

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

Purpose4/5

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

The description clearly states 'List network requests' as a specific verb+resource. It mentions returning IDs for get_network_request, which provides a hint of linkage but does not differentiate from sibling listing tools like list_console_messages or list_pages.

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 usage guidelines are provided. The description does not specify when to use this tool versus alternatives, nor does it mention prerequisites or when not to use it. The only implicit hint is that returned IDs can be used with get_network_request.

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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