Create an MCP Server

POST

ai-gateway

gateways

{gatewayId}

mcp-servers

curl --request POST \
  --url https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Vendor tools",
  "slug": "vendor-tools",
  "upstream_url": "https://mcp.vendor.example/mcp",
  "allowed_tools": [
    "get_weather",
    "lookup_customer"
  ]
}
'

import requests

url = "https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers"

payload = {
    "name": "Vendor tools",
    "slug": "vendor-tools",
    "upstream_url": "https://mcp.vendor.example/mcp",
    "allowed_tools": ["get_weather", "lookup_customer"]
}
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: 'Vendor tools',
    slug: 'vendor-tools',
    upstream_url: 'https://mcp.vendor.example/mcp',
    allowed_tools: ['get_weather', 'lookup_customer']
  })
};

fetch('https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers', 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://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers",
  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' => 'Vendor tools',
    'slug' => 'vendor-tools',
    'upstream_url' => 'https://mcp.vendor.example/mcp',
    'allowed_tools' => [
        'get_weather',
        'lookup_customer'
    ]
  ]),
  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://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers"

	payload := strings.NewReader("{\n  \"name\": \"Vendor tools\",\n  \"slug\": \"vendor-tools\",\n  \"upstream_url\": \"https://mcp.vendor.example/mcp\",\n  \"allowed_tools\": [\n    \"get_weather\",\n    \"lookup_customer\"\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://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Vendor tools\",\n  \"slug\": \"vendor-tools\",\n  \"upstream_url\": \"https://mcp.vendor.example/mcp\",\n  \"allowed_tools\": [\n    \"get_weather\",\n    \"lookup_customer\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers")

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\": \"Vendor tools\",\n  \"slug\": \"vendor-tools\",\n  \"upstream_url\": \"https://mcp.vendor.example/mcp\",\n  \"allowed_tools\": [\n    \"get_weather\",\n    \"lookup_customer\"\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "gateway_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "slug": "<string>",
    "description": "<string>",
    "server_type": "upstream",
    "transport": "streamable_http",
    "upstream_url": "<string>",
    "allowed_tools": [
      "<string>"
    ],
    "pii_inspection": true,
    "pii_redact_policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "firewall_policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "guardrail_webhook_url": "<string>",
    "guardrail_webhook_secret_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "guardrail_webhook_mode": "off",
    "guardrail_webhook_timeout_ms": 5050,
    "guardrail_webhook_failure_action": "fail_open",
    "auth": {},
    "sandbox": true,
    "status": "active",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "connect_url": "<string>",
    "resource": "<string>"
  },
  "meta": {
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

Registers an upstream MCP server. Four things are worth knowing before you call it, each of which is a refusal rather than a surprise later:

allowed_tools defaults to empty, and empty means no tools. A server created without it advertises nothing on tools/list and refuses every tools/call. The response says so in meta.note when that happens. This is deliberate — a governed gateway does not open by default.
server_type: "collection" is refused with 422 unsupported_server_type. The forwarder does not serve that type, so the row would fail every call. Only upstream is served.
transport must be streamable_http. Anything else is 422 unsupported_transport; the gateway does not speak the legacy SSE transport.
upstream_url goes through the SSRF chokepoint at write time and again at connect time. A URL that resolves to a private or link-local address is refused, not dialled.

auth selects how the server reaches its upstream: {"mode": "secret"} (the default) resolves one credential from your secret store per connection, and {"mode": "passthrough"} makes each caller supply their own — see how the server authenticates upstream. A literal credential in auth.headers is refused at write time; reference a Secret with {{secret_id:<uuid>}}. MCP servers are a plan entitlement — creating one beyond your plan’s allowance is refused. Requires the create capability on ai_gateway. See the control-plane overview for authentication, the {data, meta} envelope, pagination and error types.

Authorizations

Authorization

string

header

required

OAuth 2.1 authentication — recommended for new integrations. Access tokens (kc_ prefix) are minted at the root-host token endpoint https://api.knoxcall.com/oauth/token and passed as Authorization: Bearer <access_token>. Public clients must use PKCE with the authorization_code grant; confidential clients may use client_credentials. The first-party SDKs and the knoxcall login CLI handle token minting, caching, refresh, and DPoP for you.

Path Parameters

gatewayId

string<uuid>

required

The parent AI gateway UUID.

Body

application/json

name

string

required

slug

string

required

Lowercase letters, numbers and hyphens.

upstream_url

string<uri>

required

A public https:// MCP endpoint. Private, loopback, link-local and cloud-metadata destinations are refused.

description

string | null

server_type

enum<string>

default:upstream

collection is rejected with 422 unsupported_server_type — the forwarder does not serve it yet.

Available options:

upstream

transport

enum<string>

default:streamable_http

Only streamable_http is accepted. The gateway's connect path always builds a Streamable HTTP transport, so accepting sse would store a silent protocol mismatch.

Available options:

streamable_http

allowed_tools

string[]

Empty (the default) means the server advertises nothing.

pii_inspection

boolean

default:true

auth

object

Upstream auth for an MCP server. A secret reference is the only supported path: every header value must contain a {{secret_id:<uuid>}} (or legacy {{secret:<name>}}) placeholder. A literal is refused with 422 plaintext_auth — it would sit in cleartext in the control plane.

Show child attributes

pii_redact_policy_id

string<uuid> | null

A PII policy THIS tenant owns (AIGW-151). A policy id you do not own is refused 422 — the FK is id-only, so the ownership check is the control.

firewall_policy_id

string<uuid> | null

guardrail_webhook_url

string<uri> | null

https only; no embedded credentials; SSRF-checked at write time.

guardrail_webhook_secret_id

string<uuid> | null

guardrail_webhook_mode

enum<string>

Available options:

off,

request,

response,

both

guardrail_webhook_timeout_ms

integer

Required range: 100 <= x <= 10000

guardrail_webhook_failure_action

enum<string>

Available options:

fail_open,

fail_closed

Response

The registered MCP server.

data

object

An MCP server KnoxCall proxies and governs. connect_url and resource are deliberately different values — see their descriptions.

Show child attributes

meta

object

Metadata included with every API response.

Show child attributes

curl --request POST \
  --url https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "Vendor tools",
  "slug": "vendor-tools",
  "upstream_url": "https://mcp.vendor.example/mcp",
  "allowed_tools": [
    "get_weather",
    "lookup_customer"
  ]
}
'

import requests

url = "https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers"

payload = {
    "name": "Vendor tools",
    "slug": "vendor-tools",
    "upstream_url": "https://mcp.vendor.example/mcp",
    "allowed_tools": ["get_weather", "lookup_customer"]
}
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: 'Vendor tools',
    slug: 'vendor-tools',
    upstream_url: 'https://mcp.vendor.example/mcp',
    allowed_tools: ['get_weather', 'lookup_customer']
  })
};

fetch('https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers', 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://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers",
  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' => 'Vendor tools',
    'slug' => 'vendor-tools',
    'upstream_url' => 'https://mcp.vendor.example/mcp',
    'allowed_tools' => [
        'get_weather',
        'lookup_customer'
    ]
  ]),
  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://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers"

	payload := strings.NewReader("{\n  \"name\": \"Vendor tools\",\n  \"slug\": \"vendor-tools\",\n  \"upstream_url\": \"https://mcp.vendor.example/mcp\",\n  \"allowed_tools\": [\n    \"get_weather\",\n    \"lookup_customer\"\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://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"Vendor tools\",\n  \"slug\": \"vendor-tools\",\n  \"upstream_url\": \"https://mcp.vendor.example/mcp\",\n  \"allowed_tools\": [\n    \"get_weather\",\n    \"lookup_customer\"\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.knoxcall.com/v1/ai-gateway/gateways/{gatewayId}/mcp-servers")

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\": \"Vendor tools\",\n  \"slug\": \"vendor-tools\",\n  \"upstream_url\": \"https://mcp.vendor.example/mcp\",\n  \"allowed_tools\": [\n    \"get_weather\",\n    \"lookup_customer\"\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "gateway_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "name": "<string>",
    "slug": "<string>",
    "description": "<string>",
    "server_type": "upstream",
    "transport": "streamable_http",
    "upstream_url": "<string>",
    "allowed_tools": [
      "<string>"
    ],
    "pii_inspection": true,
    "pii_redact_policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "firewall_policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "guardrail_webhook_url": "<string>",
    "guardrail_webhook_secret_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "guardrail_webhook_mode": "off",
    "guardrail_webhook_timeout_ms": 5050,
    "guardrail_webhook_failure_action": "fail_open",
    "auth": {},
    "sandbox": true,
    "status": "active",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "connect_url": "<string>",
    "resource": "<string>"
  },
  "meta": {
    "request_id": "550e8400-e29b-41d4-a716-446655440000"
  }
}

Overview

Routes

Secrets

Clients

Environments

API Keys

Webhooks

Ephemeral Proxy

AI Gateway

Audit Logs

Account

Tenant KMS

Secret Store Migrations

Changelog

Authorizations

Path Parameters

Body

Response