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mcp-whatsapp

by Sealjay
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set_group_topic

Idempotent

Update a WhatsApp group's topic or description. Admin members can set a new topic or clear it with an empty string, visible to all group members.

Instructions

Change a group's description/topic; members see a system message indicating the description was updated. Reversible by calling again with the previous text or with an empty string to clear. Prerequisite: admin (or non-locked group). Returns the plain-text string Group <chat_jid> topic updated.

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": "set_group_topic"
  }
}

Input Schema

NameRequiredDescriptionDefault
topicNonew topic/description text; pass an empty string to clear the topic
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 / topic / description
      Previous value: -"new topic text; empty string clears"New value: +"new topic/description text; pass an empty string to clear the topic"
  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?

Discloses key behaviors beyond annotations: system message to members, reversibility, clearing via empty string, prerequisite, and the exact return string. No contradictions 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, front-loaded with purpose, no fluff. Every sentence adds value.

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: purpose, side effects, prerequisite, return value. No gaps given the annotations and schema coverage.

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 the description adds no new param info beyond what the schema already provides (e.g., empty string to clear is also in schema). 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?

Explicitly states 'Change a group's description/topic', distinguishing from sibling tools like set_group_name. The verb and resource are precise, and it mentions the system message side effect.

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?

Clearly states prerequisite (admin or non-locked group) and reversibility, providing context for when to use. However, it does not explicitly compare to alternative tools or give when-not-to-use guidance.

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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