Failed to send request: Error: Session 'default-copilot:copilotcli:/untitled-18474d52-54d9-450f-a779-978160e3ed78' not found

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#317,529 opened on May 20, 2026 0 comments 0 reactions 1 assignee View on GitHub

@alexdima is already working on this.

Since May 20, 2026.

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Description

agents-window local-harness

Agent sessions
I start a brand new local chat session. I send a message. Nothing gets rendered. I get the following error in developer tools
I just created this session, so I do not understand the not found error.

ERR Failed to send request: Error: Session 'default-copilot:copilotcli:/untitled-18474d52-54d9-450f-a779-978160e3ed78' not found
    at zv._createNewSessionFrom (sessions.desktop.main.js:sourcemap:3833:5513)
    at zv._sendSubsequentChat (sessions.desktop.main.js:sourcemap:3833:2895)
    at zv.sendAndCreateChat (sessions.desktop.main.js:sourcemap:3832:16329)
    at kst.sendAndCreateChat (sessions.desktop.main.js:sourcemap:3853:87730)
    at Krt._send (sessions.desktop.main.js:sourcemap:3824:171047)
    at Object.sendRequest (sessions.desktop.main.js:sourcemap:3824:167415)
    at xie._send (sessions.desktop.main.js:sourcemap:3824:164194)
    at Ffe.value (sessions.desktop.main.js:sourcemap:3824:160164)
    at rb._deliver (sessions.desktop.main.js:sourcemap:405:3268)
    at rb._deliverQueue (sessions.desktop.main.js:sourcemap:405:3357)
    at rb.fire (sessions.desktop.main.js:sourcemap:405:3692)
    at rb.fire (sessions.desktop.main.js:sourcemap:682:26338)
    at i.onKeyDown (sessions.desktop.main.js:sourcemap:682:23293)
    at a.emitKeyDown (sessions.desktop.main.js:sourcemap:489:34479)
    at a.emitKeyDown (sessions.desktop.main.js:sourcemap:489:22741)
    at vre._onKeyDown (sessions.desktop.main.js:sourcemap:641:4236)
    at HTMLDivElement.<anonymous> (sessions.desktop.main.js:sourcemap:640:7425)

Another error I see

ERR Failed to create new session: Error: Cannot resolve workspace for URI: unknown:/
    at zv.createNewSession (copilotChatSessionsProvider.ts:1748:1)
    at kst.createNewSession (sessionsManagementService.ts:333:28)
    at Krt._createNewSession (newChatViewPane.ts:205:1)
    at Krt._onWorkspaceSelected (newChatViewPane.ts:388:1)
    at async Ffe.value (newChatViewPane.ts:105:1)

Dominant language: TypeScript
Stars: 193k
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PR merge metrics: PR metrics pending

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