Interpolating variable in the Custom MCP config

[mskitroot]

Describe the bug

When adding a Custom MCP in both AgentFlow and Chatflow, and trying to use variables for the Token, I get 401 on my MCP. Debugging on my MCP shows that the Authorization header is sent without the variable being interpolated.

Being no expert I debuged the server code and found that workspaceId is not sent to CustomMCP and when getVars is called it returns an empty set. See screenshots

To Reproduce

1. Create a variable i.e. mcptoken
2. Add in Chatflow a CustomMCP. Configure it to get the Bearer Token as per example

{
    "url": "http://localhost:3001/sse",
    "headers": {
        "Authorization": "Bearer {{$vars.mcptoken}}"
    }
}

3. Check on the MCP server side the value of Authorization Header

Expected behavior

The variable to be interpolated

Screenshots

MCP Server Logs

Snippet from packages/components/src/utils.ts:getVars

Snippet from packages/components/nodes/tools/MCP/CustomMCP/CustomMCP.ts:loadMethods

Debuging output

Flow

No response

Use Method

pnpm start

Flowise Version

3.0.10

Operating System

macOS

Browser

Safari

Additional context

No response

[mskitroot]

Further investigation showed that getSingleNodeAsyncOptions in packages/server/src/services/nodes/index.ts does not add workspaceId in the response.

Adding that line seems to have fixed the issue but I am not sure if that is the correct way to do it.