← Back to Skills Marketplace
315
Downloads
0
Stars
0
Active Installs
1
Versions
Install in OpenClaw
/install wa-number-checker
Description
Query whether a phone number is registered on WhatsApp. Use when the user asks to check if a number has WhatsApp, verify if a number exists on WhatsApp, "查这个...
Usage Guidance
This skill will send phone numbers you provide to an external API at wa-check-api.whatsabot.com and requires an API key (x-api-key) even though the skill metadata does not declare one. Before installing or using it: (1) verify the operator/owner of wa-check-api.whatsabot.com and their privacy policy; (2) require the skill to explicitly declare the required env var name (e.g., WA_CHECK_API_KEY) so you can store it safely, rather than relying on ambiguous examples like process.env.API_KEY; (3) avoid sending sensitive phone numbers until you trust the service; (4) confirm how the service logs or stores queried numbers (retention/usage); and (5) if you want stronger assurance, ask the publisher to publish code or a reputable homepage and to justify why an MCP or hosted API is needed rather than a local check. If the publisher cannot clarify the missing API key declaration and who runs the endpoint, treat the skill as untrusted.
Capability Analysis
Type: OpenClaw Skill
Name: wa-number-checker
Version: 1.0.0
The skill bundle provides a legitimate utility for checking if a phone number is registered on WhatsApp via the 'wa-check-api.whatsabot.com' service. The instructions in SKILL.md and references/api.md are transparent, describing standard REST API and MCP tool usage with appropriate error handling and no evidence of malicious intent, data exfiltration, or obfuscation.
Capability Assessment
Purpose & Capability
The name/description match the instructions: the skill either calls an MCP (if present) or a REST API to check WhatsApp registration. Using an external API for this purpose is coherent.
Instruction Scope
Instructions explicitly tell the agent to call an external endpoint (https://wa-check-api.whatsabot.com) and include an x-api-key header; they do not instruct reading unrelated files or system paths. However, the instructions will transmit users' phone numbers to a third‑party service — a privacy concern that should be disclosed and accepted by users.
Install Mechanism
No install spec and no code files are present (instruction-only). This minimizes on-disk risk; there is no arbitrary download or install behavior to review.
Credentials
The skill declares no required environment variables or primary credential, yet the REST instructions require an API key (x-api-key). The sample Node snippet references process.env.API_KEY (ambiguous name). Missing declaration of the API key and inconsistent env var naming are incoherent and could lead to accidental credential leakage or misconfiguration.
Persistence & Privilege
always is false and the skill does not request persistent system-level privileges or modify other skills. Autonomous invocation is allowed by default but is not combined with other high-risk privileges here.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install wa-number-checker - After installation, invoke the skill by name or use
/wa-number-checker - Provide required inputs per the skill's parameter spec and get structured output
Version History
v1.0.0
- Initial release of wa-number-checker-skills.
- Allows users to check if a phone number is registered on WhatsApp.
- Supports queries in English and Chinese for WhatsApp number verification.
- Integrates with MCP (wa-check-api) if available, otherwise uses REST API.
- Provides clear instructions for parameters, success responses, and error handling.
Metadata
Frequently Asked Questions
What is WhatsApp Number Checker?
Query whether a phone number is registered on WhatsApp. Use when the user asks to check if a number has WhatsApp, verify if a number exists on WhatsApp, "查这个... It is an AI Agent Skill for Claude Code / OpenClaw, with 315 downloads so far.
How do I install WhatsApp Number Checker?
Run "/install wa-number-checker" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is WhatsApp Number Checker free?
Yes, WhatsApp Number Checker is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does WhatsApp Number Checker support?
WhatsApp Number Checker is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created WhatsApp Number Checker?
It is built and maintained by Jason (@zhuqling); the current version is v1.0.0.
More Skills