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Create Tool

Listed
vapiai·vlatest·agents

Vapiai's create-tool generates custom scripts or functions to automate complex tasks based on user instructions.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add vapiai/skills --skill create-tool -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

vapiai

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill failed 1 of 6 checks. A failure is not proof of bad intent; it means something in the code needs a human to look at it before you run it.

  • No undeclared network calls: failed

    Contacts 1 host that is neither well-known infrastructure nor declared in the skill's frontmatter: api.vapi.ai.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

    Hosts contacted

    api.vapi.aiundeclared

    What it found (3 of 6)

    • create-tool/references/api-examples.md:58contacts api.vapi.ai
      curl --fail-with-body -X POST https://api.vapi.ai/tool \
    • create-tool/references/api-examples.md:67contacts api.vapi.ai
      curl --fail-with-body https://api.vapi.ai/tool/<tool-id> \
    • create-tool/references/api-examples.md:70contacts api.vapi.ai
      curl --fail-with-body https://api.vapi.ai/assistant/<assistant-id> \

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned vapiai/skills at d91f18561f.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
d91f18561f
Manifest
create-tool/SKILL.md
Scanned
11 files, 825 lines
Copies in repo
2 — all of them scanned
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill, Vapiai's create-tool, allows AI agents to define and register custom tools that can be used during calls. These tools enable actions like looking up data, booking appointments, transferring calls, sending messages, and more, extending the agent’s capabilities beyond basic conversation. The tool creation process involves defining a tool type (e.g., Function Tool, Transfer Call Tool, End Call Tool) and configuring its parameters via API requests or server-side SDKs.

When to use it

  • Automating call center tasks: Create tools for looking up order statuses, checking account balances, or initiating refunds.
  • Integrating with backend systems: Define function tools that interact with your servers to retrieve information or perform actions based on user requests during a call.
  • Routing calls intelligently: Use Transfer Call Tools to direct callers to specific departments or agents based on their needs.
  • Providing self-service options: Enable users to complete tasks like booking appointments without human intervention.

Key capabilities

  • Function Tool Creation: Define tools with a name, description, and parameters for data retrieval or action execution via server calls.
  • Transfer Call Tool Definition: Configure call transfers to specific phone numbers or SIP endpoints with associated messages.
  • End Call Tool Implementation: Allows the AI agent to terminate an active call.
  • API-based tool creation: Tools can be created using a REST API endpoint.
  • Server SDK Support: Tools can be created programmatically using a TypeScript server SDK.

Example prompts

  • "Create a function tool called 'get_weather' that takes a location as input and retrieves the current weather."
  • "Define a Transfer Call Tool to route callers with billing questions to extension +1234567890."
  • "I need an End Call Tool so the assistant can conclude calls automatically."

Tips & gotchas

  • VAPI_API_KEY Required: You must set the VAPI_API_KEY environment variable for authentication. Refer to the "setup-api-key" skill if needed.
  • Server Implementation: Function tools require a server endpoint (url in the tool definition) to handle requests and return results. This server needs to be implemented separately.