claude-code - 💡(How to fix) Fix [Bug] Claude infers Slack workspace membership from URL subdomain without verification, presents unverifiable assumptions as facts [1 participants]

[{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {"error":"upstream_connection_failure","flag":"UF","message":"Could not connect to upstream service. Verify the service is running and reachable.","request_id":"1a551b64-9756-9994-8b05-5c0ec389a1a2","request_url":"antmcp.forge.black.ant.dev/antmcp/google-workspace/mcp","service":"antmcp","timestamp":"2026-04-21T17:25:48.733Z"}\r\n\r\n\n at send (/$bunfs/root/src/entrypoints/cli.js:577:33615)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T17:25:49.140Z"},{"error":"AbortError: The operation was aborted.\n at unknown\n at abortChildProcess (node:child_process:935:42)\n at onAbortListener2 (node:child_process:35:24)","timestamp":"2026-04-21T17:33:01.573Z"},{"error":"Error: ripgrep exited with code null\n at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:100:18219)\n at emit (node:events:98:22)\n at #maybeClose (node:child_process:766:16)\n at #handleOnExit (node:child_process:520:72)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T17:33:01.578Z"},{"error":"TelemetrySafeError: Error executing tool sheets_update_values: sheets values.update 1av9aAjaRj52f7_OSSv_tsw9LUFNkQ24gumuKWgAsmkU!Spinups!N2: 503 Service Unavailable: {"error":"upstream_connection_failure","flag":"UF","message":"Could not connect to upstream service. Verify the service is running and reachable.","request_id":"12d5ffdc-df18-9879-850a-e356a99fd63e","request_url":"antmcp.forge.black.ant.dev/outbound-proxy/https:/sheets.googleapis.com/v4/spreadsheets/1av9aAjaRj52f7_OSSv_tsw9LUFNkQ24gumuKWgAsmkU/values/Spinups%21N2?valueInputOption=USER_ENTERED","service":"antmcp","timestamp":"2026-04-21T17:36:50.478Z"}\n\n at y19 (/$bunfs/root/src/entrypoints/cli.js:6171:26837)\n at async SnK (/$bunfs/root/src/entrypoints/cli.js:6171:23931)\n at async call (/$bunfs/root/src/entrypoints/cli.js:6171:43424)\n at async LvK (/$bunfs/root/src/entrypoints/cli.js:3904:15032)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T17:36:51.998Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {"error":"upstream_connection_failure","flag":"UF","message":"Could not connect to upstream service. Verify the service is running and reachable.","request_id":"59973ab5-763f-9610-84c3-901d770c195a","request_url":"antmcp.forge.black.ant.dev/antmcp/google-workspace/mcp","service":"antmcp","timestamp":"2026-04-21T17:36:54.235Z"}\r\n\r\n\n at send (/$bunfs/root/src/entrypoints/cli.js:577:33615)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T17:36:55.625Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {"error":"upstream_connection_failure","flag":"UF","message":"Could not connect to upstream service. Verify the service is running and reachable.","request_id":"f5261466-f94f-9e0b-8404-9c8ad768711f","request_url":"antmcp.forge.black.ant.dev/antmcp/google-workspace/mcp","service":"antmcp","timestamp":"2026-04-21T17:37:09.329Z"}\r\n\r\n\n at send (/$bunfs/root/src/entrypoints/cli.js:577:33615)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-21T17:37:11.182Z"},{"error":"Error: Streamable HTTP error: Error POSTing to endpoint: event: message\r\ndata: {"error":"upstream_connection_failure","flag":"UF","message":"Could not connect to upstream service. Verify the service is running and reachable.","request_id":"b9af0fe2-0096-9ca5-b34b-488666c9b0b0","request_url":"antmcp.forge.black.ant.dev/antmcp/google-workspace/mcp","service":"antmcp","timestamp"…

TL;DR

The issue is likely due to Claude's overconfidence in determining Slack retention settings, and a workaround would be to verify the workspace membership of the channels before making any changes.

Guidance

• Review Claude's inference process to identify where it failed to account for the possibility of channels being in a different workspace.
• Verify the workspace membership of the channels #rl-*-runops and #prod-run-* to ensure they are indeed in the CSys workspace with a 5-year retention policy.
• Update Claude's logic to handle cases where the workspace membership is unknown or cannot be determined.
• Consider adding a flag or warning when Claude is unsure about the workspace membership to prevent similar overconfidence issues in the future.

Example

No code example is provided as the issue is more related to the logic and inference process of Claude rather than a specific code snippet.

Notes

The provided issue content is truncated, which might limit the ability to provide a comprehensive solution. However, the guidance provided should help in identifying and mitigating the issue.

Recommendation

Apply a workaround by verifying the workspace membership of the channels and updating Claude's logic to handle unknown or undetermined workspace memberships, as the root cause seems to be related to overconfidence in inference rather than a specific version issue.