Bricked session for no apparent reason

[HarlanGIT]

Describe the bug

My session got bricked for no apparent reason. Last time it was because of a failed MCP call. This time nothing seem to have failed. Here is the flow:

• I asked for a code review with no edits.
• I ran 2 terminal commands ( make ) with !
• Asked for something else
• Session bricked

Session logs

2025-10-20T14:11:01.325Z [INFO] Starting Copilot CLI: 0.0.346
Commit: 74e4d22
2025-10-20T14:11:01.326Z [INFO] Node.js version: v22.20.0
2025-10-20T14:11:02.394Z [LOG] Starting remote MCP client for ReVa_Ghidra with url: http://localhost:8080/mcp/message
2025-10-20T14:11:02.395Z [LOG] Creating MCP client for ReVa_Ghidra...
2025-10-20T14:11:02.401Z [LOG] Connecting MCP client for ReVa_Ghidra...
2025-10-20T14:11:02.521Z [LOG] MCP transport for ReVa_Ghidra closed
2025-10-20T14:11:02.522Z [ERROR] Failed to start MCP client for remote server ReVa_Ghidra: TypeError: fetch failed
2025-10-20T14:11:02.831Z [LOG] Using Copilot API endpoint: https://api.individual.githubcopilot.com/mcp/readonly
2025-10-20T14:11:02.832Z [LOG] Starting remote MCP client for github-mcp-server with url: https://api.individual.githubcopilot.com/mcp/readonly
2025-10-20T14:11:02.832Z [LOG] Creating MCP client for github-mcp-server...
2025-10-20T14:11:02.832Z [LOG] Connecting MCP client for github-mcp-server...
2025-10-20T14:11:03.406Z [LOG] MCP client for github-mcp-server connected, took 574ms
2025-10-20T14:11:03.406Z [LOG] Started MCP client for remote server github-mcp-server
2025-10-20T14:11:03.406Z [LOG] GitHub MCP server configured after authentication
2025-10-20T14:13:06.013Z [INFO] Using default model: claude-sonnet-4.5
2025-10-20T14:13:06.335Z [INFO]  
2025-10-20T14:13:12.888Z [INFO] [log_188c2d, x-request-id: "00000-dbd2b19e-ba77-43be-99c0-9e8946c4edda"] post https://api.individual.githubcopilot.com/chat/completions succeeded with status 200 in 4989ms

2025-10-20T14:13:21.891Z [INFO] [log_e8f820, x-request-id: "00000-ad05a836-2b2c-49a8-9c7a-e4a9ca291fe7"] post https://api.individual.githubcopilot.com/chat/completions succeeded with status 200 in 3879ms

2025-10-20T14:13:24.558Z [INFO] [log_751801, x-request-id: "00000-429e181b-6adc-4b2c-b70e-0326e8854555"] post https://api.individual.githubcopilot.com/chat/completions succeeded with status 200 in 2583ms

2025-10-20T14:13:28.240Z [INFO] [log_dac5c8, x-request-id: "00000-7acb179c-dd51-453f-a6ff-4584144d437b"] post https://api.individual.githubcopilot.com/chat/completions succeeded with status 200 in 3605ms

2025-10-20T14:13:32.645Z [INFO] [log_638ee3, x-request-id: "00000-43306cfb-e5e2-46dd-a46e-8eaa4035fe66"] post https://api.individual.githubcopilot.com/chat/completions succeeded with status 200 in 4142ms

2025-10-20T14:14:05.104Z [INFO] [log_2af35b, x-request-id: "00000-4bb3a44a-7771-4675-bf70-c1fcd8984fc3"] post https://api.individual.githubcopilot.com/chat/completions succeeded with status 200 in 31808ms

2025-10-20T14:34:53.038Z [INFO] Using default model: claude-sonnet-4.5
2025-10-20T14:34:53.039Z [INFO]  
2025-10-20T14:34:54.476Z [INFO] [log_2e11e4, x-request-id: "00000-c4a2592f-6449-4012-880f-04045b58b801"] post https://api.individual.githubcopilot.com/chat/completions failed with status 400 in 575ms - error; not retryable

2025-10-20T14:34:54.478Z [ERROR] error (Request-ID C95F:1249D3:21164D6:2829F2D:68F64890)
2025-10-20T14:34:54.478Z [ERROR] {
  "status": 400,
  "headers": {},
  "requestID": "00000-c4a2592f-6449-4012-880f-04045b58b801",
  "error": {
    "message": "messages.14.content.0: unexpected `tool_use_id` found in `tool_result` blocks: c6b5f2a4-7692-44d0-8291-a3f8ed2e9a7d. Each `tool_result` block must have a corresponding `tool_use` block in the previous message.",
    "code": "invalid_request_body"
  },
  "code": "invalid_request_body",
  "request_id": "00000-c4a2592f-6449-4012-880f-04045b58b801",
  "ghRequestId": "C95F:1249D3:21164D6:2829F2D:68F64890",
  "name": "CAPIError"
}
2025-10-20T14:35:01.632Z [INFO] [log_9529da, x-request-id: "00000-c3e226b7-eb62-4b2d-904c-8cb4bdd372d0"] post https://api.individual.githubcopilot.com/chat/completions failed with status 400 in 398ms - error; not retryable

2025-10-20T14:35:01.634Z [ERROR] error (Request-ID C95F:1249D3:211807C:282BECB:68F64890)
2025-10-20T14:35:01.634Z [ERROR] {
  "status": 400,
  "headers": {},
  "requestID": "00000-c3e226b7-eb62-4b2d-904c-8cb4bdd372d0",
  "error": {
    "message": "messages.14.content.0: unexpected `tool_use_id` found in `tool_result` blocks: c6b5f2a4-7692-44d0-8291-a3f8ed2e9a7d. Each `tool_result` block must have a corresponding `tool_use` block in the previous message.",
    "code": "invalid_request_body"
  },
  "code": "invalid_request_body",
  "request_id": "00000-c3e226b7-eb62-4b2d-904c-8cb4bdd372d0",
  "ghRequestId": "C95F:1249D3:211807C:282BECB:68F64890",
  "name": "CAPIError"
}
2025-10-20T14:39:50.581Z [INFO] Starting Copilot CLI: 0.0.346
Commit: 74e4d22
2025-10-20T14:39:50.581Z [INFO] Node.js version: v22.20.0
2025-10-20T14:39:51.118Z [LOG] Starting remote MCP client for ReVa_Ghidra with url: http://localhost:8080/mcp/message
2025-10-20T14:39:51.119Z [LOG] Creating MCP client for ReVa_Ghidra...
2025-10-20T14:39:51.126Z [LOG] Connecting MCP client for ReVa_Ghidra...
2025-10-20T14:39:52.076Z [LOG] MCP transport for ReVa_Ghidra closed
2025-10-20T14:39:52.077Z [ERROR] Failed to start MCP client for remote server ReVa_Ghidra: TypeError: fetch failed
2025-10-20T14:39:52.540Z [LOG] Using Copilot API endpoint: https://api.individual.githubcopilot.com/mcp/readonly
2025-10-20T14:39:52.540Z [LOG] Starting remote MCP client for github-mcp-server with url: https://api.individual.githubcopilot.com/mcp/readonly
2025-10-20T14:39:52.540Z [LOG] Creating MCP client for github-mcp-server...
2025-10-20T14:39:52.541Z [LOG] Connecting MCP client for github-mcp-server...
2025-10-20T14:39:54.131Z [LOG] MCP client for github-mcp-server connected, took 1590ms
2025-10-20T14:39:54.132Z [LOG] Started MCP client for remote server github-mcp-server
2025-10-20T14:39:54.132Z [LOG] GitHub MCP server configured after authentication
2025-10-20T14:39:57.700Z [INFO] Using default model: claude-sonnet-4.5
2025-10-20T14:39:57.985Z [INFO]  
2025-10-20T14:39:59.823Z [INFO] [log_75a7bc, x-request-id: "00000-f0e13b57-66dd-4882-adfb-17055c871359"] post https://api.individual.githubcopilot.com/chat/completions failed with status 400 in 1519ms - error; not retryable

2025-10-20T14:39:59.826Z [ERROR] error (Request-ID CC0B:369FAA:212C9A1:28502D7:68F649C0)
2025-10-20T14:39:59.826Z [ERROR] {
  "status": 400,
  "headers": {},
  "requestID": "00000-f0e13b57-66dd-4882-adfb-17055c871359",
  "error": {
    "message": "messages.14.content.0: unexpected `tool_use_id` found in `tool_result` blocks: c6b5f2a4-7692-44d0-8291-a3f8ed2e9a7d. Each `tool_result` block must have a corresponding `tool_use` block in the previous message.",
    "code": "invalid_request_body"
  },
  "code": "invalid_request_body",
  "request_id": "00000-f0e13b57-66dd-4882-adfb-17055c871359",
  "ghRequestId": "CC0B:369FAA:212C9A1:28502D7:68F649C0",
  "name": "CAPIError"
}

If you need more details, please ask.

Affected version

0.0.346 Commit: 74e4d22

Steps to reproduce the behavior

No response

Expected behavior

No response

Additional context

• MacOs, Intel cpu
• Default terminal
• Claude Sonnet 4.5

[williammartin]

Almost definitely a duplicate of #364, which will be fixed in today's release. Thanks for the report!

[HarlanGIT]

Oops sorry I didn't realize. But Local shell execution seems to be involved.

[williammartin]

Yep for sure, super reproducible with:

> Hello
> !ls
> Write that to a file

The underlying issue is that when we were reworking our session management we began treating the result of ! as a tool call result, and now the API is getting mad because we're saying: "here's a result for a tool", and it's like "what are you talking about?".

This might end up going out tomorrow though, the AWS outage gives us pause on releasing for observability reasons.

[SteveSandersonMS]

The fix for this is merged and will be included in today's release (for team tracking: it's PR 7618).

Thanks @HarlanGIT for the report! Please let us know if you still encounter issues after updating to latest tomorrow.

[RyanHecht]

The aforementioned release is now available! https://github.com/github/copilot-cli/releases/tag/v0.0.348