> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://developer.projectmanager.com/api-reference/task-assignee/create-or-update-task-assignee/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://developer.projectmanager.com/_mcp/server.

# Create Or Update TaskAssignee

PUT https://api.projectmanager.com/api/data/tasks/{taskId}/assignees
Content-Type: application/json

Adds or updates a TaskAssignee to a Task.  If the TaskAssignee is already assigned to the Task, update
their allocation.  If the TaskAssignee is not yet assigned to the Task, assign them and set their
allocation level to the correct amount.
            
A TaskAssignee is an assignment of a Resource to a Task.  You can assign multiple Resources
to a Task and designate what proportion of their time will be allocated to this Task.

Reference: https://developer.projectmanager.com/api-reference/task-assignee/create-or-update-task-assignee

## Authentication

- `Authorization` header (bearer token, required) — Bearer authentication of the form `Bearer <token>`, where token is your auth token.

## Request

### Path parameters

- `taskId` (string, required) — The unique identifier of the Task to add or update an assignment

### Headers

- `x-integration-name` (string, optional) — The name of the calling system passed along as a header parameter

### Body (application/json)

This endpoint expects a list of AssigneeUpsertDto.

- `list of AssigneeUpsertDto`

## Response

### 200

Success

- `error` (AstroError, optional, nullable) — If the API call failed, this will contain information about the error that occurred.
- `success` (boolean, optional) — True if the API call succeeded; false otherwise.
- `hasError` (boolean, optional) — True if the API call failed.
- `statusCode` (enum, optional) — The HTTP code of the response.
  - Allowed values: `Continue`, `SwitchingProtocols`, `Processing`, `EarlyHints`, `OK`, `Created`, `Accepted`, `NonAuthoritativeInformation`, `NoContent`, `ResetContent`, `PartialContent`, `MultiStatus`, `AlreadyReported`, `IMUsed`, `MultipleChoices`, `MovedPermanently`, `Found`, `SeeOther`, `NotModified`, `UseProxy`, `Unused`, `TemporaryRedirect`, `PermanentRedirect`, `BadRequest`, `Unauthorized`, `PaymentRequired`, `Forbidden`, `NotFound`, `MethodNotAllowed`, `NotAcceptable`, `ProxyAuthenticationRequired`, `RequestTimeout`, `Conflict`, `Gone`, `LengthRequired`, `PreconditionFailed`, `RequestEntityTooLarge`, `RequestUriTooLong`, `UnsupportedMediaType`, `RequestedRangeNotSatisfiable`, `ExpectationFailed`, `MisdirectedRequest`, `UnprocessableEntity`, `Locked`, `FailedDependency`, `UpgradeRequired`, `PreconditionRequired`, `TooManyRequests`, `RequestHeaderFieldsTooLarge`, `UnavailableForLegalReasons`, `InternalServerError`, `NotImplemented`, `BadGateway`, `ServiceUnavailable`, `GatewayTimeout`, `HttpVersionNotSupported`, `VariantAlsoNegotiates`, `InsufficientStorage`, `LoopDetected`, `NotExtended`, `NetworkAuthenticationRequired`
- `data` (ChangeSetStatusDto, optional) — Returns the id of a specific ChangeSet

## Types

### AssigneeUpsertDto

An AssigneeUpsert is a create-or-update process that will either create a new assignment of effort to a TaskAssignee or update an existing effort amount for an existing TaskAssignee.

- `id` (string, required) — The unique identifier of the TaskAssignee to which work is being assigned.
- `assignedEffort` (integer, optional, nullable) — The new amount of effort to assign for this Resource. This value is measured in minutes. If AssignedEffort is null, we try either use the existing AssignedEffort (if there is one), or the Default Planned Effort.

### AstroError

Information about an error that occurred within the ProjectManager API.

- `technicalError` (string, optional, nullable) — A technical description of the error that occurred. Not suitable for display to end users.
- `additionalErrors` (list of string, optional, nullable) — If additional errors beyond the main error in `Message` occurred, they will be listed here as individual messages.
- `validationErrors` (map from string to list of string, optional, nullable) — This contains a dictionary of validation errors. The key is the name of the field
- `message` (string, optional, nullable) — A description of the error that occurred. If your application has a user interface, show this message to explain what went wrong.

### ChangeSetStatusDto

Returns the id of a specific ChangeSet

- `changeSetId` (string, optional) — The unique identifier of this Changeset
- `id` (string, optional) — The unique identifier of the entity affected by this Changeset. For example, if this Changeset was created for a Task, this value will be the unique identifier for the Task.

## Examples

**Request**

```json
[
  {
    "id": "string"
  }
]
```

**Response**

```json
{
  "error": {
    "technicalError": "string",
    "additionalErrors": [
      "string"
    ],
    "validationErrors": {},
    "message": "string"
  },
  "success": true,
  "hasError": true,
  "statusCode": "Continue",
  "data": {
    "changeSetId": "string",
    "id": "string"
  }
}
```

**SDK Code**

```python
import requests

url = "https://api.projectmanager.com/api/data/tasks/taskId/assignees"

payload = [{ "id": "string" }]
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://api.projectmanager.com/api/data/tasks/taskId/assignees';
const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '[{"id":"string"}]'
};

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

```go
package main

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

func main() {

	url := "https://api.projectmanager.com/api/data/tasks/taskId/assignees"

	payload := strings.NewReader("[\n  {\n    \"id\": \"string\"\n  }\n]")

	req, _ := http.NewRequest("PUT", 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
require 'uri'
require 'net/http'

url = URI("https://api.projectmanager.com/api/data/tasks/taskId/assignees")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "[\n  {\n    \"id\": \"string\"\n  }\n]"

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

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.put("https://api.projectmanager.com/api/data/tasks/taskId/assignees")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("[\n  {\n    \"id\": \"string\"\n  }\n]")
  .asString();
```

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

$client = new \GuzzleHttp\Client();

$response = $client->request('PUT', 'https://api.projectmanager.com/api/data/tasks/taskId/assignees', [
  'body' => '[
  {
    "id": "string"
  }
]',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

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

```csharp
using RestSharp;

var client = new RestClient("https://api.projectmanager.com/api/data/tasks/taskId/assignees");
var request = new RestRequest(Method.PUT);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "[\n  {\n    \"id\": \"string\"\n  }\n]", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [["id": "string"]] as [String : Any]

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

let request = NSMutableURLRequest(url: NSURL(string: "https://api.projectmanager.com/api/data/tasks/taskId/assignees")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "PUT"
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()
```