[Bug] Filesystem MCP server crashes on startup with "Server transport closed unexpectedly"

Bug Description
I've been experiencing issues with Cowork (desktop app on Mac) since the outage on April 15. Even after a full Mac restart, I'm unable to add folders and keep getting two errors:
"Session VM process not available. The session may not be fully initialized."
"Failed to mount [folder path] – operation not permitted"
Looking at the MCP logs, the Filesystem server is crashing almost immediately after every startup with "Server transport closed unexpectedly" — it never stays connected long enough to complete initialization. This was working fine for weeks prior.
I've attached the relevant logs. Could you please investigate and reset my session?
Account email: milena.rangelov@smartepd.com

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.111
• Feedback ID: 14bf7419-1a4c-4584-9e30-44d87fe78b90

Errors

[{"error":"Error: Failed to delete keychain entry: security: SecKeychainSearchCopyNext: The specified item could not be found in the keychain.\n    at vMq (file:///Users/smartepdworkaccount/.nvm/versions/node/v22.22.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:301:272235)\n    at process.processTicksAndRejections (node:internal/process/task_queues:103:5)\n    at async BUq (file:///Users/smartepdworkaccount/.nvm/versions/node/v22.22.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:480:889)\n    at async eR1 (file:///Users/smartepdworkaccount/.nvm/versions/node/v22.22.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:480:787)\n    at async pq8 (file:///Users/smartepdworkaccount/.nvm/versions/node/v22.22.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:2986:2123)\n    at async fX6 (file:///Users/smartepdworkaccount/.nvm/versions/node/v22.22.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:3011:5687)\n    at async file:///Users/smartepdworkaccount/.nvm/versions/node/v22.22.1/lib/node_modules/@anthropic-ai/claude-code/cli.js:3035:3250","timestamp":"2026-04-16T16:48:42.109Z"},{"error":"RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded\n    at Socket.onChildStdout (node:child_process:484:14)\n    at Socket.emit (node:events:519:28)\n    at addChunk (node:internal/streams/readable:561:12)\n    at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)\n    at Readable.push (node:internal/streams/readable:392:5)\n    at Pipe.onStreamRead (node:internal/stream_base_commons:189:23)","timestamp":"2026-04-16T16:49:17.741Z"}]