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mcp-whatsapp

mcp-whatsapp

by Sealjay
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set_group_name

Idempotent

Rename a WhatsApp group by setting a new subject. Only admins can perform this action; members see a system message with the new name.

Instructions

Change a group's display name (its subject); members see a system message naming the new subject. Reversible by calling again with the previous name. Prerequisite: admin (or non-locked group). Returns the plain-text string Group <chat_jid> renamed to "<name>".

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": {
      "chat_jid": "<chat_jid>",
      "name": "<name>"
    },
    "name": "set_group_name"
  }
}

Input Schema

NameRequiredDescriptionDefault
nameYesnew group subject (display name)
chat_jidYesWhatsApp JID: individual as `<digits>@s.whatsapp.net` or bare phone digits, group as `<digits>-<timestamp>@g.us`

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.3.0
    • changedInput schema / properties / name / description
      Previous value: -"new group name"New value: +"new group subject (display name)"
  2. Added
  3. Removed
  4. First observedv0.1.0

TDQS

A4.5/5.0
Behavior5/5

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

Describes side effects (members see a system message), reversibility, and request/response behavior. Annotations already indicate idempotentHint=true, but description adds concrete meaning: calling again with previous name reverses it. No contradiction with annotations.

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?

Three sentences, each serving a purpose: action, effect plus reversibility, prerequisite and return format. No redundant words.

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

Completeness5/5

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

Complete for a simple tool: covers prerequisite, behavioral effects, return format (since no output schema). All relevant aspects are addressed.

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% with good descriptions for both parameters. Description adds no new parameter details beyond what schema provides, so baseline 3 is appropriate.

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?

Description clearly states the action (change display name) and resource (group). It uses specific verb 'Change' and resource 'group's display name (its `subject`)', distinguishing it from sibling tools like set_group_announce or set_group_locked.

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?

Explicitly mentions prerequisite 'admin (or non-locked group)' and implies when to use (to rename a group). Reversibility is noted, which guides use. No explicit alternatives are stated, but the specificity relative to siblings is clear.

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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