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Mochi

by DevZonayed
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JavaScript
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browser_console_messages

Retrieve recent browser console messages and uncaught exceptions for the active tab. Filter by level or timestamp, and optionally clear the buffer after retrieval.

Instructions

Recent browser console + uncaught exceptions for the active tab. Capture starts when the session attaches CDP (eagerly on session_start). Returns the last N messages, optionally filtered by level or timestamp. Pass clear=true to drain.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "browser_console_messages"
  }
}

Input Schema

NameRequiredDescriptionDefault
tabIdNo
levelNoFilter: log | info | warn | error | debug.
sinceNoUnix-ms timestamp; only messages at or after this are returned.
limitNoMax messages returned (capped at 500).
clearNoEmpty the buffer after returning.

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A4.2/5.0
Behavior4/5

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

With no annotations provided, the description carries full burden. It discloses eager capture on CDP attach, limit to last N messages, and the clear behavior. This is sufficient for a read-focused tool, though rate limits or return format are not mentioned.

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 two sentences, front-loaded with purpose, and every clause adds value. No wasted 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?

Given 5 parameters, no output schema, and no annotations, the description covers the tool's behavior well (capture timing, filtering, clearing). It does not describe return structure, but that is acceptable without output schema.

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 high (80%), so baseline is 3. The description adds minimal value beyond schema: e.g., 'filter by level or timestamp' mirrors schema. The 'clear=true to drain' is already in schema. The description does not significantly enhance parameter understanding.

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 it retrieves recent browser console messages and uncaught exceptions for the active tab. This is a specific verb-resource pair, and since no sibling tool provides similar functionality, it is well-disambiguated.

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

Usage Guidelines4/5

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

The description indicates that capture starts eagerly on session start, implying usage after session attachment. It mentions optional filters and the clear parameter. However, it does not explicitly contrast with alternatives, though no sibling covers console messages.

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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