Tools - Zero Runtime

Tools let the agent take actions and fetch live data, for example to check an order’s status, book an appointment, or look up an account. The LLM decides when to call a tool based on the tool’s name and description. On the Pipeline tab, select Tools.

Tool library

Tools are shared across your account, so you can reuse one tool in many agents.

Select Assign to attach a tool to the current branch, or Unassign to remove it. Assignments are saved to the draft and versioned with your commits.
Filter by HTTP Method or by whether a tool is Assigned.
Use a tool’s ⋮ menu to Edit, Duplicate, or Delete it.

Add a tool

Select Add Tool and fill in the form.

Add Tool form with name, description, HTTP method, request URL, parameters, headers, messages, and timeout settings

Field	Description
Tool Name (required)	The name the LLM uses to call the tool, for example `get_weather`. Lowercase letters, digits, and underscores, starting with a letter.
Description (required)	What the tool does, when to use it, what it returns, and examples. The LLM relies on this to decide when to call the tool.
HTTP Method	`GET`, `POST` (default), `PUT`, `PATCH`, or `DELETE`.
Request URL (required)	The endpoint to call. It must start with `https://`.
Parameters	Arguments the LLM fills in when calling the tool. Each has a type (`String`, `Number`, or `Boolean`), a name, and a description.
Headers	HTTP headers the endpoint needs, such as authentication or content type.
Before Tool Call Message	What the agent says before calling the tool, for example “Please hold on while I fetch that.”
Tool Error Message	What the agent says if the tool returns an error.
Response Timeout	How long to wait for a response (10–60 s, default 10 s).
Timeout Message	What the agent says if the request times out.

Example description

Get the current weather for a city when the user asks about weather.
Returns temperature in Celsius and a short condition, for example "22, sunny".

Mention the tool in your system prompt too, for example “Use get_order_status whenever the caller asks where their order is.”