When passing the onprogress method, the content passed in _meta will be lost.

[daidi]

this is right，the _meta could be passed to the svr

client?.callTool({
        name: toolName,
        arguments: input as Record<string, unknown>,
        _meta: {
          __test: 'test',
        },
      }, CallToolResultSchema, {}})

however:

client?.callTool({
        name: toolName,
        arguments: input as Record<string, unknown>,
        _meta: {
          __test: 'test',
        },
      }, CallToolResultSchema, {

onprogress: (progress: any) => {
}
}})

_meta disappeared...

[daidi]

the main problem should be here:

typescript-sdk/src/shared/protocol.ts

Line 544 in df0d9c4

_meta: { progressToken: messageId },

[daidi]

#560