[Regression] [Error] unhandlederror-Unsupported session type 'copilot-cloud-agent' for local workspaces

[vs-code-engineering]

Error Message

unhandlederror-Unsupported session type 'copilot-cloud-agent' for local workspaces

Stack Trace

    at wb.createNewSession (./src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts:1362:0)
    at krt.createNewSession (./src/vs/sessions/services/sessions/browser/sessionsManagementService.ts:301:27)
    at ort._createNewSession (./src/vs/sessions/contrib/chat/browser/newChatViewPane.ts:139:0)
    at ort._onWorkspaceSelected (./src/vs/sessions/contrib/chat/browser/newChatViewPane.ts:218:0)
    at async Vge.value (./src/vs/sessions/contrib/chat/browser/newChatViewPane.ts:70:0)

Raw Stack Trace (minified)

Error: Unsupported session type 'copilot-cloud-agent' for local workspaces     at wb.createNewSession (out/vs/sessions/sessions.desktop.main.js:3851:24570)     at krt.createNewSession (out/vs/sessions/sessions.desktop.main.js:3872:112597)     at ort._createNewSession (out/vs/sessions/sessions.desktop.main.js:3851:95693)     at ort._onWorkspaceSelected (out/vs/sessions/sessions.desktop.main.js:3851:97033)     at async Vge.value (out/vs/sessions/sessions.desktop.main.js:3851:94416)

Details

Property	Value
Bucket ID	48ca3e40-f24f-2e5a-0854-f0106ad3267d
Version	1.118.0-insider
Commit	659d444a
Last Seen	Thu Apr 23 2026 22:35:12 GMT+0000 (Coordinated Universal Time)
Platforms	Mac, Linux, Windows
Product	Agents

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This issue was automatically created from the VS Code Errors Dashboard

[vs-code-engineering]

Regression Details

• Product: Agents
• Regression type: new
• Last release without this error: 1.117.0-insider (7f0183b, Apr 21)
• First release with this error: 1.118.0-insider (102df5b, Apr 22)
• Commit range: 7f0183b5...102df5b5

Deminified Stack (top frames)

#	Source	Line
1	copilotChatSessionsProvider.ts	1362
2	sessionsManagementService.ts	301
3	newChatViewPane.ts	139
4	newChatViewPane.ts	218
5	newChatViewPane.ts	70

The error Unsupported session type 'copilot-cloud-agent' for local workspaces started appearing in the 1.118.0-insider builds (Apr 22). It occurs in copilotChatSessionsProvider.createNewSession when attempting to create a session of type copilot-cloud-agent in a local workspace context. Affects Windows, Mac, and Linux users.

Generated by errors-agents-regression-scan · ● 6.1M · ◷

[vs-code-engineering]

🔍 Error Investigation

Summary

The error Unsupported session type 'copilot-cloud-agent' for local workspaces is thrown when a user switches from a cloud/GitHub-remote workspace to a local workspace in the Agents new-chat view. The session type picker retains the stale copilot-cloud-agent type from the previous session, and the workspace selection handler passes it directly to createNewSession without validating it against the valid types for the newly selected workspace. This affects 63 users across 76 hits on 5 different Insiders builds (April 22–23).

A fix has already been merged: PR #312227 by @sandy081 (April 23).

Culprit Commit

Field	Value
Commit	b86cc10a (part of PR #309563)
Author	@sandy081
PR	#309563
Message	fix #309128 and add docs to the sessions provider
Why	This PR wired the SessionTypePicker.selectedType into the workspace selection handler (onDidSelectWorkspace) without validating the type against the new workspace's supported types. When a user switches from a cloud workspace to a local one, the stale copilot-cloud-agent type is passed through unchecked.

Fix already merged: PR #312227 by @sandy081 adds validation in the workspace selection handler to check the session type against getSessionTypes() for the selected workspace, falling back to the first valid type when the current selection is incompatible.

Code Flow

sequenceDiagram
    participant User as User Action
    participant WP as WorkspacePicker
    participant NCV as NewChatViewPane
    participant STP as SessionTypePicker
    participant SMS as SessionsManagementService
    participant CCSP as CopilotChatSessionsProvider

    User->>WP: Select local workspace
    WP->>NCV: onDidSelectWorkspace(localWorkspace)
    NCV->>STP: .selectedType
    Note over STP: ⚠️ Root cause:<br/>Returns stale 'copilot-cloud-agent'<br/>from previous cloud session
    NCV->>SMS: createNewSession(providerId, localUri, 'copilot-cloud-agent')
    SMS->>CCSP: createNewSession(localUri, 'copilot-cloud-agent')
    Note over CCSP: scheme ≠ GITHUB_REMOTE_FILE_SCHEME<br/>sessionTypeId ≠ 'copilotcli'
    Note over CCSP: 💥 Error thrown:<br/>"Unsupported session type<br/>'copilot-cloud-agent' for local workspaces"

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Affected Files

File	Role
src/vs/sessions/contrib/chat/browser/newChatViewPane.ts	Root cause — workspace selection handler passes stale session type without validation
src/vs/sessions/contrib/chat/browser/sessionTypePicker.ts	Data source — selectedType returns the active session's type, which can be stale
src/vs/sessions/services/sessions/browser/sessionsManagementService.ts	Pass-through — only falls back to default type when sessionTypeId is falsy
src/vs/sessions/contrib/copilotChatSessions/browser/copilotChatSessionsProvider.ts	Crash site — throws when receiving invalid session type for the workspace

Repro Steps

1. Open VS Code Insiders (Agents app) with cloud sessions enabled
2. Create a new session targeting a GitHub remote repository (this sets the session type to copilot-cloud-agent)
3. In the new-chat view, use the workspace picker to switch to a local folder
4. The workspace selection handler passes the stale copilot-cloud-agent type → error is thrown

Fix Proposal

Already fixed in PR #312227 (merged April 23, 2026).

Fix location: src/vs/sessions/contrib/chat/browser/newChatViewPane.ts → onDidSelectWorkspace handler
Approach: Before calling _onWorkspaceSelected, validate the session type picker's selectedType against getSessionTypes(workspaceUri) for the new workspace. If the type is not in the valid list, fall back to the first valid type. The fix also adds SessionType.CopilotCloud scheme recognition in getSessionTypes().

Note: Two other code paths still pass selectedType without workspace validation: (1) the onDidSelectSessionType handler (mitigated by the picker disabling unsupported types), and (2) the initial session creation on view load (mitigated by selectedType being undefined at startup). These are lower risk but worth monitoring.

Recommended Owner

@sandy081 — authored both the culprit PR (#309563) and the fix PR (#312227); most familiar with the session type picker and workspace selection logic.

Generated by errors-investigate · ● 16.1M · ◷