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POST
/
user
/
tools
Create mid call tool
curl --request POST \
  --url https://app.autocalls.ai/api/user/tools \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "description": "<string>",
  "endpoint": "<string>",
  "method": "<string>",
  "body_format": "<string>",
  "timeout": 123,
  "headers": [
    {
      "name": "<string>",
      "value": "<string>"
    }
  ],
  "static_fields": [
    {
      "key": "<string>",
      "value": "<string>"
    }
  ],
  "schema": [
    {
      "name": "<string>",
      "type": "<string>",
      "description": "<string>",
      "required": true
    }
  ]
}
'
import requests

url = "https://app.autocalls.ai/api/user/tools"

payload = {
    "name": "<string>",
    "description": "<string>",
    "endpoint": "<string>",
    "method": "<string>",
    "body_format": "<string>",
    "timeout": 123,
    "headers": [
        {
            "name": "<string>",
            "value": "<string>"
        }
    ],
    "static_fields": [
        {
            "key": "<string>",
            "value": "<string>"
        }
    ],
    "schema": [
        {
            "name": "<string>",
            "type": "<string>",
            "description": "<string>",
            "required": True
        }
    ]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    name: '<string>',
    description: '<string>',
    endpoint: '<string>',
    method: '<string>',
    body_format: '<string>',
    timeout: 123,
    headers: [{name: '<string>', value: '<string>'}],
    static_fields: [{key: '<string>', value: '<string>'}],
    schema: [{name: '<string>', type: '<string>', description: '<string>', required: true}]
  })
};

fetch('https://app.autocalls.ai/api/user/tools', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));
<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://app.autocalls.ai/api/user/tools",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'name' => '<string>',
    'description' => '<string>',
    'endpoint' => '<string>',
    'method' => '<string>',
    'body_format' => '<string>',
    'timeout' => 123,
    'headers' => [
        [
                'name' => '<string>',
                'value' => '<string>'
        ]
    ],
    'static_fields' => [
        [
                'key' => '<string>',
                'value' => '<string>'
        ]
    ],
    'schema' => [
        [
                'name' => '<string>',
                'type' => '<string>',
                'description' => '<string>',
                'required' => true
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://app.autocalls.ai/api/user/tools"

	payload := strings.NewReader("{\n  \"name\": \"<string>\",\n  \"description\": \"<string>\",\n  \"endpoint\": \"<string>\",\n  \"method\": \"<string>\",\n  \"body_format\": \"<string>\",\n  \"timeout\": 123,\n  \"headers\": [\n    {\n      \"name\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"static_fields\": [\n    {\n      \"key\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"schema\": [\n    {\n      \"name\": \"<string>\",\n      \"type\": \"<string>\",\n      \"description\": \"<string>\",\n      \"required\": true\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}
HttpResponse<String> response = Unirest.post("https://app.autocalls.ai/api/user/tools")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"<string>\",\n  \"description\": \"<string>\",\n  \"endpoint\": \"<string>\",\n  \"method\": \"<string>\",\n  \"body_format\": \"<string>\",\n  \"timeout\": 123,\n  \"headers\": [\n    {\n      \"name\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"static_fields\": [\n    {\n      \"key\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"schema\": [\n    {\n      \"name\": \"<string>\",\n      \"type\": \"<string>\",\n      \"description\": \"<string>\",\n      \"required\": true\n    }\n  ]\n}")
  .asString();
require 'uri'
require 'net/http'

url = URI("https://app.autocalls.ai/api/user/tools")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"name\": \"<string>\",\n  \"description\": \"<string>\",\n  \"endpoint\": \"<string>\",\n  \"method\": \"<string>\",\n  \"body_format\": \"<string>\",\n  \"timeout\": 123,\n  \"headers\": [\n    {\n      \"name\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"static_fields\": [\n    {\n      \"key\": \"<string>\",\n      \"value\": \"<string>\"\n    }\n  ],\n  \"schema\": [\n    {\n      \"name\": \"<string>\",\n      \"type\": \"<string>\",\n      \"description\": \"<string>\",\n      \"required\": true\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body
{
  "message": "Tool created successfully",
  "data": {
    "id": 1,
    "name": "check_order_status",
    "description": "Use this tool to check the status of a customer's order.",
    "type": "http",
    "endpoint": "https://api.yourstore.com/orders/{order_id}/status",
    "method": "GET",
    "body_format": "json",
    "timeout": 10,
    "headers": [
      {
        "name": "Content-Type",
        "value": "application/json"
      },
      {
        "name": "Authorization",
        "value": "Bearer {{crm_key}}"
      }
    ],
    "static_fields": [
      {
        "key": "source",
        "value": "autocalls"
      },
      {
        "key": "caller",
        "value": "{{customer_phone}}"
      }
    ],
    "schema": [
      {
        "name": "order_id",
        "type": "string",
        "description": "The customer's order ID",
        "required": true
      },
      {
        "name": "amount",
        "type": "float",
        "description": "Order total as a decimal, e.g. 19.99",
        "required": false
      },
      {
        "name": "priority_order",
        "type": "boolean",
        "description": "Whether this is a priority order",
        "required": false
      }
    ],
    "created_at": "2025-10-10T12:00:00.000000Z",
    "updated_at": "2025-10-10T12:00:00.000000Z"
  }
}

{
  "message": "Tool name must start with a letter or underscore and contain only letters, numbers, and underscores (max 64 characters).",
  "errors": {
    "name": [
      "Tool name must start with a letter or underscore and contain only letters, numbers, and underscores (max 64 characters)."
    ]
  }
}

{
  "message": "You have reached your plan limit of 5 mid call tools. Please upgrade your plan to create more tools."
}
This endpoint allows you to create a new mid call tool that can be used by your AI assistants to interact with external APIs during calls.

​
Body Parameters

The public API creates HTTP request tools. Automation Platform tools (which generate a linked flow) are created from the dashboard. Tool values support dynamic variables — use {param} for AI-extracted parameters in the URL, and {{variable}} (e.g. {{customer_phone}}) in the URL, header values, and static field values.
​
name
string
required
Tool name — letters, numbers and underscores, starting with a letter or underscore (max 64 characters, e.g., get_weather, book_appointment)
​
description
string
required
Detailed explanation of when and how the AI should use this tool (max 255 characters)
​
endpoint
string
required
Valid URL of the API endpoint to call (max 2048 characters)
​
method
string
required
HTTP method: GET, POST, PUT, PATCH, or DELETE
​
body_format
string
How the request body is encoded for write methods (POST/PUT/PATCH): json (default) or form (application/x-www-form-urlencoded)
​
timeout
integer
Request timeout in seconds (1-30, default: 10)
​
headers
array
HTTP headers to send with the request
​
static_fields
array
Fixed key/value pairs always sent with the request (the AI never changes them)
​
schema
array
Parameters that the AI will extract from conversation and send to the endpoint

​
Response fields

​
message
string
Success message
​
data
object
The created tool object
{
  "message": "Tool created successfully",
  "data": {
    "id": 1,
    "name": "check_order_status",
    "description": "Use this tool to check the status of a customer's order.",
    "type": "http",
    "endpoint": "https://api.yourstore.com/orders/{order_id}/status",
    "method": "GET",
    "body_format": "json",
    "timeout": 10,
    "headers": [
      {
        "name": "Content-Type",
        "value": "application/json"
      },
      {
        "name": "Authorization",
        "value": "Bearer {{crm_key}}"
      }
    ],
    "static_fields": [
      {
        "key": "source",
        "value": "autocalls"
      },
      {
        "key": "caller",
        "value": "{{customer_phone}}"
      }
    ],
    "schema": [
      {
        "name": "order_id",
        "type": "string",
        "description": "The customer's order ID",
        "required": true
      },
      {
        "name": "amount",
        "type": "float",
        "description": "Order total as a decimal, e.g. 19.99",
        "required": false
      },
      {
        "name": "priority_order",
        "type": "boolean",
        "description": "Whether this is a priority order",
        "required": false
      }
    ],
    "created_at": "2025-10-10T12:00:00.000000Z",
    "updated_at": "2025-10-10T12:00:00.000000Z"
  }
}

{
  "message": "Tool name must start with a letter or underscore and contain only letters, numbers, and underscores (max 64 characters).",
  "errors": {
    "name": [
      "Tool name must start with a letter or underscore and contain only letters, numbers, and underscores (max 64 characters)."
    ]
  }
}

{
  "message": "You have reached your plan limit of 5 mid call tools. Please upgrade your plan to create more tools."
}

​
Attaching Tools to Assistants

After creating a tool, you need to attach it to an assistant to use it during calls. Tools are managed through the Assistant API:
  • Create Assistant - Use the tool_ids parameter to attach tools when creating an assistant
  • Update Assistant - Use the tool_ids parameter to add, remove, or replace tools on an existing assistant