400 websocket_error: ApiIdParam id exceeds 64 chars during iOS streaming

[hoopdad]

Summary

When connected and streaming from an up-to-date iOS app, short commands triggered a 400 bad_request with a websocket_error. One command was simply go.

Error

✗ Execution failed: CAPIError: 400 {"error":{"code":"bad_request","type":"websocket_error","message":"[ApiIdParam] [input[1].id] [string_above_max_length] Invalid 'input[1].id': string too long. Expected a string with maximum length 64, but got a string with length 380 instead."}} (Request ID: 00000-ef2d3e2a-2e1c-4bdd-b810-4006d9f709c7)

Context

• Connected and streaming from the iOS app
• The app was up to date
• Commands were short
• One command was just go

Expected

Commands should execute normally, or the client should validate the websocket id before sending it.

Actual

The request failed with a 400 because input[1].id was 380 characters, above the 64-character limit.

[IeuanWalker]

Also getting this but via the SDK -

[
  {
    "type": "session.error",
    "data": {
      "errorType": "query",
      "message": "Execution failed: CAPIError: 400 Invalid \u0027input[6].id\u0027: string too long. Expected a string with maximum length 64, but got a string with length 1108 instead. (Request ID: 0F05:37CBDA:D36B143:E1F8094:6A2089F7)",
      "providerCallId": "0F05:37CBDA:D36B143:E1F8094:6A2089F7",
      "serviceRequestId": "9d3b98ac-ba7f-48bb-8112-1e51895c9e2c",
      "stack": "CAPIError: 400 Invalid \u0027input[6].id\u0027: string too long. Expected a string with maximum length 64, but got a string with length 1108 instead.\n    at t.fromAPIError (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:1024:1099)\n    at K_t.getCompletionWithTools (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:4111:33090)\n    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)\n    at async BGe.getCompletionWithTools (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:4142:3399)\n    at async t.runAgenticLoop (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:5103:63174)\n    at async t.processQueuedItems (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:5103:13095)\n    at async t.processQueue (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:5103:3476)\n    at async t.send (file:///C:/Users/ieuan/AppData/Local/copilot/pkg/win32-x64/1.0.57/app.js:5101:4400)",
      "statusCode": 400
    },
    "id": "1d089098-d9b0-40a4-be4c-07b63fab7279",
    "parentId": "a28404ca-42e1-4a8e-a189-323fe9093d8c",
    "timestamp": "2026-06-03T20:09:29.153\u002B00:00"
  }
]