Can a server update the progress token in the response to tasks/get

[stindall]

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• I have checked that this question would not be more appropriate as an issue in a specific repository
• I have searched existing discussions and documentation for answers

Question Category

• Protocol Specification
• SDK Usage
• Server Implementation
• General Implementation
• Documentation
• Other

Your Question

Can Progress token be used in conjunction with Tasks such that the progres is displayed in calls to tasks/get rather than sent as a notification. For example, consider the following task request and response and the subsequent tasks/get response. Is the response valid?

REQUEST
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/call",
"params": {
"name": "get_weather",
"arguments": {
"city": "New York",
"_meta": {
"progressToken": "abc123"
}
},
"task": {
"ttl": 60000
}
}
}

RESPONSE
{
"jsonrpc": "2.0",
"id": 1,
"result": {
"task": {
"taskId": "786512e2-9e0d-44bd-8f29-789f320fe840",
"status": "working",
"statusMessage": "The operation is now in progress.",
"createdAt": "2025-11-25T10:30:00Z",
"lastUpdatedAt": "2025-11-25T10:40:00Z",
"ttl": 60000,
"pollInterval": 5000
}
}
}

CALL TO TASKS/GET
{
"jsonrpc": "2.0",
"id": 3,
"method": "tasks/get",
"params": {
"taskId": "786512e2-9e0d-44bd-8f29-789f320fe840"
}
}

RESPONSE
{
"jsonrpc": "2.0",
"id": 3,
"result": {
"taskId": "786512e2-9e0d-44bd-8f29-789f320fe840",
"status": "working",
"statusMessage": "The operation is still in progress.",
"createdAt": "2025-11-25T10:30:00Z",
"lastUpdatedAt": "2025-11-25T10:40:00Z",
"ttl": 30000,
"pollInterval": 5000
}
"params": {
"progressToken": "abc123",
"progress": 50,
"total": 100,
"message": "Still working on it..."
}
}

Essentially, I am asking if progress token can be combined with tasks/get responses.

Thanks in advance.