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# MCP endpoint - list tools & call tool

POST https://ah-api.merge.dev/api/v1/tool-packs/{tool_pack_id}/registered-users/{registered_user_id}/mcp/
Content-Type: application/json

Endpoint to list tools and call a tool. Use the `tools/list` method to retrieve available tools, and the `tools/call` method to execute a specific tool. Implements the JSON-RPC 2.0 MCP specification.

Reference: https://docs.merge.dev/merge-agent-handler/agent-handler/mcp/endpoint-post

## Authentication

- `Authorization` header (bearer token, required) — Token-based authentication with required prefix "Bearer"

## Request

### Path parameters

- `registered_user_id` (string, required)
- `tool_pack_id` (string, required)

### Query parameters

- `authenticated_only` (boolean, optional, default: false) — When true, only return tools for connectors the registered user has already authenticated, and hide per-connector `authenticate_*` tools.
- `connectors` (list of string, optional) — Restrict `tools/list` and `tools/call` to one or more connectors. For multiple values, repeat the param (`?connectors=slack&connectors=github`) or use comma-separate values (`?connectors=slack,github`).
- `format` (enum, optional)
  - Allowed values: `event-stream`, `json`

### Body (application/json)

This endpoint expects an object.

- `jsonrpc` (string, required)
- `method` (enum, required)
  - Allowed values: `initialize`, `tools/list`, `tools/call`
- `id` (integer, optional)
- `params` (ApiV1ToolPacksToolPackIdRegisteredUsersRegisteredUserIdMcpPostRequestBodyContentApplicationJsonSchemaParams, optional)

## Response

### 200

JSON-RPC 2.0 response

- `jsonrpc` (string, optional)
- `id` (integer, optional)
- `result` (ApiV1ToolPacksToolPackIdRegisteredUsersRegisteredUserIdMcpPostResponsesContentApplicationJsonSchemaResult, optional)

## Types

### ApiV1ToolPacksToolPackIdRegisteredUsersRegisteredUserIdMcpPostRequestBodyContentApplicationJsonSchemaParams

### ApiV1ToolPacksToolPackIdRegisteredUsersRegisteredUserIdMcpPostResponsesContentApplicationJsonSchemaResult

## Examples

### List available tools

**Request**

```json
{
  "jsonrpc": "2.0",
  "method": "tools/list",
  "id": 1
}
```

**Response**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "tools": [
      {
        "description": "Create a new issue",
        "inputSchema": {
          "properties": {
            "title": {
              "type": "string"
            }
          },
          "type": "object"
        },
        "name": "create_issue"
      }
    ]
  }
}
```

**SDK Code**

```python List available tools
import requests

url = "https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/"

payload = {
    "jsonrpc": "2.0",
    "method": "tools/list",
    "id": 1
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript List available tools
const url = 'https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"jsonrpc":"2.0","method":"tools/list","id":1}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go List available tools
package main

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

func main() {

	url := "https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/"

	payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/list\",\n  \"id\": 1\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(res)
	fmt.Println(string(body))

}
```

```ruby List available tools
require 'uri'
require 'net/http'

url = URI("https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/")

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  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/list\",\n  \"id\": 1\n}"

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

```java List available tools
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/list\",\n  \"id\": 1\n}")
  .asString();
```

```php List available tools
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/', [
  'body' => '{
  "jsonrpc": "2.0",
  "method": "tools/list",
  "id": 1
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp List available tools
using RestSharp;

var client = new RestClient("https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/list\",\n  \"id\": 1\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift List available tools
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "jsonrpc": "2.0",
  "method": "tools/list",
  "id": 1
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```

### Call a tool

**Request**

```json
{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "id": 1,
  "params": {
    "arguments": {
      "input": "comment text"
    },
    "name": "create_comment"
  }
}
```

**Response**

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "content": [
      {
        "text": "Comment created successfully.",
        "type": "text"
      }
    ],
    "isError": false
  }
}
```

**SDK Code**

```python Call a tool
import requests

url = "https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/"

payload = {
    "jsonrpc": "2.0",
    "method": "tools/call",
    "id": 1,
    "params": {
        "arguments": { "input": "comment text" },
        "name": "create_comment"
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript Call a tool
const url = 'https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"jsonrpc":"2.0","method":"tools/call","id":1,"params":{"arguments":{"input":"comment text"},"name":"create_comment"}}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go Call a tool
package main

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

func main() {

	url := "https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/"

	payload := strings.NewReader("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/call\",\n  \"id\": 1,\n  \"params\": {\n    \"arguments\": {\n      \"input\": \"comment text\"\n    },\n    \"name\": \"create_comment\"\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(res)
	fmt.Println(string(body))

}
```

```ruby Call a tool
require 'uri'
require 'net/http'

url = URI("https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/")

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  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/call\",\n  \"id\": 1,\n  \"params\": {\n    \"arguments\": {\n      \"input\": \"comment text\"\n    },\n    \"name\": \"create_comment\"\n  }\n}"

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

```java Call a tool
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/call\",\n  \"id\": 1,\n  \"params\": {\n    \"arguments\": {\n      \"input\": \"comment text\"\n    },\n    \"name\": \"create_comment\"\n  }\n}")
  .asString();
```

```php Call a tool
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/', [
  'body' => '{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "id": 1,
  "params": {
    "arguments": {
      "input": "comment text"
    },
    "name": "create_comment"
  }
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp Call a tool
using RestSharp;

var client = new RestClient("https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"jsonrpc\": \"2.0\",\n  \"method\": \"tools/call\",\n  \"id\": 1,\n  \"params\": {\n    \"arguments\": {\n      \"input\": \"comment text\"\n    },\n    \"name\": \"create_comment\"\n  }\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift Call a tool
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "jsonrpc": "2.0",
  "method": "tools/call",
  "id": 1,
  "params": [
    "arguments": ["input": "comment text"],
    "name": "create_comment"
  ]
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://ah-api.merge.dev/api/v1/tool-packs/tool_pack_id/registered-users/registered_user_id/mcp/")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```