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wwebjs-mcp

wwebjs-mcp

by victor-halla
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Remote

groupChat_runMethod

Execute a specified method on a WhatsApp group chat and return the result.

Instructions

[Group Chat] Execute a method on the group. Execute a method on the group and return the result

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "sessionId": "<sessionId>"
    },
    "name": "groupChat_runMethod"
  }
}

Input Schema

NameRequiredDescriptionDefault
chatIdNoUnique WhatsApp id for the given chat group
methodNoThe name of the method to execute
optionsNoThe options to pass to the method
sessionIdYesUnique identifier for the session (alphanumeric and - allowed)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.2/5.0
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 disclosing side effects. It only states that the result is returned, but does not warn that methods may be mutating, require permissions, fail, or have timing/rate limits. This is a generic dynamic execution tool, so behavioral ambiguity is significant.

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

Conciseness2/5

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

The description is only two sentences, but the second sentence repeats the first with the minor addition 'and return the result'. This redundancy wastes space without adding information; it could be condensed into one sentence.

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?

For an open-ended method runner with no output schema, no annotations, and a free-form 'method' string, the description should explain how to discover valid methods and what result shape to expect. The current text gives no such context, leaving the agent under-informed for correct invocation.

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% and each parameter (sessionId, chatId, method, options) already has a description in the schema. The tool description adds no new meaning to the parameters beyond echoing 'method' and 'options', so the baseline of 3 is appropriate.

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

Purpose2/5

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

The description 'Execute a method on the group' essentially restates the tool name groupChat_runMethod and is repeated verbatim with only 'and return the result' appended. It provides no examples of valid methods or distinction from sibling tools like chat_runMethod or client_runMethod.

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 guidance is given for when to use this generic runner versus the many specific sibling methods (groupChat_setSubject, chat_getLabels, etc.). There is no mention of exclusions, prerequisites, or a pointer to documentation for available methods.

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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