amrshah/callferos-test/custom-webhook

Claude Code and agent skill by amrshah/callferos-test

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Call any custom HTTPS endpoint

Install

npx vskill@latest install amrshah/callferos-test/custom-webhook

SKILL.md

Custom Webhook Skill

When to use

When the user wants their voice agent to call a custom API or webhook that is not one of the built-in integrations. This is the escape hatch for any HTTPS endpoint. Common triggers:

  • "call my API when..."
  • "send data to my webhook"
  • "integrate with our internal system"

What to do

  1. Ask for details: What is the HTTPS endpoint URL? What HTTP method?

What data should be sent? What does the response look like?

  1. Use `secret("custom_webhook")` in tool scripts if authentication is

needed. The system will automatically emit the correct action card based on the platform configuration. Do NOT emit action cards manually. If the webhook uses a custom auth header name, read it from secret('custom_webhook.header_name') instead of hardcoding the header.

  1. Generate tool config: Use a QuickJS script field. The endpoint MUST use HTTPS.

Example tool configs

No authentication
json
{
  "name": "webhook.notify",
  "description": "POST caller data to the webhook",
  "params": [
    {"name": "caller_name", "type": "string", "required": true},
    {"name": "summary", "type": "string", "required": false}
  ],
  "script": "let resp = http_post('https://hooks.example.com/incoming', {caller_name: caller_name, summary: summary});\nif (resp.status >= 200 && resp.status < 300) { return 'Done'; }\nthrow new Error(`Webhook ${resp.status}: ${resp.body}`);",
  "side_effect": true
}
Bearer token authentication
json
{
  "name": "webhook.notify",
  "description": "POST caller data to the webhook using bearer auth",
  "params": [
    {"name": "caller_name", "type": "string", "required": true},
    {"name": "summary", "type": "string", "required": false}
  ],
  "script": "let key = secret('custom_webhook');\nlet resp = http_post_h('https://api.example.com/hook', {caller_name: caller_name, summary: summary}, {'Authorization': 'Bearer ' + key});\nif (resp.status >= 200 && resp.status < 300) { return 'Sent'; }\nthrow new Error(`Webhook ${resp.status}: ${resp.body}`);",
  "side_effect": true
}
Custom header authentication
json
{
  "name": "webhook.notify",
  "description": "POST data using a custom auth header",
  "params": [
    {"name": "data", "type": "string", "required": true}
  ],
  "script": "let key = secret('custom_webhook');\nlet header = secret('custom_webhook.header_name') || 'X-API-Key';\nlet headers = {};\nheaders[header] = key;\nlet resp = http_post_h('https://api.example.com/webhook', {data: data}, headers);\nif (resp.status >= 200 && resp.status < 300) { return 'OK'; }\nthrow new Error(`Webhook ${resp.status}: ${resp.body}`);",
  "side_effect": true
}

Rules

  • Endpoint MUST use HTTPS (the existing SSRF validator enforces this)
  • NEVER put API keys or tokens in plain script strings
  • Use secret('custom_webhook') for the primary key/token
  • Use secret('custom_webhook.header_name') to read the custom header name field
  • NEVER hardcode a user-provided custom auth header name. The header name belongs in the

connection config so the credential card can update it later.

  • NEVER ask for credentials in chat
  • If no auth is needed, omit the secret() call entirely
  • For script tools, treat non-2xx HTTP responses as failures and throw using resp.status/resp.body instead of returning a plain-text error string

Security

  • Security scanPassed, 90 of 100Pattern checks on the skill's files.
  • Model reviewPassed

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