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nolanbaxter

Local Browser MCP

by nolanbaxter

console

Retrieve buffered console messages, including logs, warnings, and errors, captured from the current page to diagnose issues.

Instructions

Return buffered console messages (log/warn/error) captured from the page.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Addedv0.4.0

TDQS

A3.8/5.0
Behavior2/5

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

No annotations are provided, so the description carries the full burden. It states that messages are 'buffered' and captured from the page, but it does not disclose whether reading clears the buffer, whether repeated calls return the same messages, or what the exact return structure is. Some behavior is transparent, but key details are missing.

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?

The description is one concise sentence with no filler. It front-loads the core behavior and the qualifying details (buffer, levels, page origin) are packed efficiently.

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 zero-parameter retrieval tool with no nested schema and no output schema, the description is largely complete. An agent can understand what the tool returns and from where, though a bit more detail about return format or buffer semantics would fully round it out.

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?

The tool has zero parameters and schema coverage is 100%, so the description has no parameter burden to carry. The baseline of 4 applies because there are no parameters to explain.

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 uses a specific verb ('Return') with a clear resource ('buffered console messages') and specifies the message kinds included ('log/warn/error') and their origin ('captured from the page'). This clearly distinguishes it from siblings like network, dialogs, or downloads.

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?

The description makes it clear the tool is for retrieving page console output, so the intended context is implied. However, it does not explicitly state when to prefer this tool over alternatives such as network or eval, nor does it mention any prerequisites like having navigated first.

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