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mcp-whatsapp

mcp-whatsapp

by Sealjay
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set_group_announce

Idempotent

Toggle announce-only mode on a WhatsApp group to restrict posting to admins only, or allow all members to post.

Instructions

Toggle announce-only mode on a group; when enabled, non-admin send attempts are rejected by WhatsApp servers and members see a system message about the change. Reversible by calling again with the inverse value. Prerequisite: admin. See set_group_locked for restricting metadata edits. Returns the plain-text string Group <chat_jid> announce_only=<bool>.

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>",
      "announce_only": "<announce_only>"
    },
    "name": "set_group_announce"
  }
}

Input Schema

NameRequiredDescriptionDefault
chat_jidYesWhatsApp JID: individual as `<digits>@s.whatsapp.net` or bare phone digits, group as `<digits>-<timestamp>@g.us`
announce_onlyYestrue to lock posting to admins only, false to allow all members to post

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv0.3.0
    • changedInput schema / properties / announce_only / description
      Previous value: -"true to lock posting to admins only"New value: +"true to lock posting to admins only, false to allow all members to post"
  2. Added
  3. Removed
  4. First observedv0.1.0

TDQS

A4.9/5.0
Behavior5/5

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

Despite annotations already covering idempotentHint and destructiveHint, the description adds valuable behavioral details: non-admin attempts are rejected, members see a system message, and the return value string is specified.

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 main action, then elaborates on behavior and alternatives. No wasted 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?

Given the simplicity (2 params, no output schema), the description covers behavior, prerequisites, return value, and a sibling, making it fully actionable.

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?

Input schema already describes both parameters well (100% coverage). Description adds context (non-admin rejection) but does not significantly extend semantics beyond schema.

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 the tool toggles announce-only mode on a group, with specifics on behavior (reject non-admin, system message). It distinguishes itself from sibling set_group_locked by mentioning the alternative for restricting metadata edits.

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

Usage Guidelines5/5

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

Explicitly says when to use (toggle announce-only), lists prerequisite (admin), indicates reversibility, and points to set_group_locked for metadata edits, providing clear alternatives.

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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