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freema

Firefox DevTools MCP

by freema

list_console_messages

Retrieve console messages from Firefox with filters by level, time, text, or source to debug web applications.

Instructions

List console messages. Supports filtering by level, time, text, source.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
levelNoFilter by level
limitNoMax messages (default: 50)
sinceMsNoOnly last N ms
textContainsNoText filter (case-insensitive)
sourceNoFilter by source
formatNoOutput format (default: text)
Behavior2/5

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

No annotations provided, so the description must carry full behavioral burden. It states 'List console messages' which implies a read operation, but doesn't mention ordering, pagination, or that it returns recent messages by default. The schema adds some parameter details, but the description lacks context about output format or 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.

Conciseness4/5

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

The description is a single sentence that efficiently summarizes the tool's purpose and key filtering capabilities. It avoids verbosity, though it could be slightly improved by front-loading the core action.

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

Completeness3/5

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

With 6 parameters fully described in the schema and no output schema, the description provides basic context for a list/filter tool. It covers the available filters but lacks details on default behavior, sorting, or performance implications, making it adequate but not comprehensive.

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 description coverage is 100%, so baseline is 3. The description repeats the filterable fields (level, time, text, source) but adds no additional meaning beyond the schema.

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 clearly states the action 'List' and the resource 'console messages', and mentions supported filters (level, time, text, source), which differentiates it from sibling tools like clear_console_messages or list_network_requests.

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 explicit guidance on when to use this tool versus alternatives (e.g., clear_console_messages, list_network_requests). No exclusions or prerequisites 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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