chat: delegate agent-host sessions#321702
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DonJayamanne merged 8 commits intoJun 17, 2026
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- Pass transcript handoff as an attachment so the prompt stays user-authored. - Route agent-host delegation through the correct session-opening path in VS Code and Agents Window. - Preserve attachment round-tripping and existing Agents Window behavior while matching the updated SDK behavior. Fixes #319819 (Commit message generated by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Pull request overview
Adds “Continue in…” delegation support for agent-host-backed sessions (local agent-host-* and remote remote-*) across the main VS Code window and the Agents window, while keeping transcript handoff user-authored by moving prior conversation context into a paste attachment.
Changes:
- Build and hand off a bounded “delegation transcript”, passed as a paste attachment for agent-host targets (and inlined into the prompt for non-agent-host targets).
- Route agent-host delegation via a single generic command in the Agents window, and via
openChatSessionin the main window; update UI state/menus to reflect pending delegation selection. - Add paste-attachment metadata + restoration logic to preserve attachment round-tripping, and extend/adjust tests accordingly.
Show a summary per file
| File | Description |
|---|---|
| src/vs/workbench/contrib/chat/test/browser/chatContinueInAction.test.ts | New unit tests for delegation transcript building and transcript-as-paste attachment wrapping. |
| src/vs/workbench/contrib/chat/test/browser/agentSessions/agentSessionViewModel.test.ts | Expands coverage for getAgentCanContinueIn to include agent-host session types. |
| src/vs/workbench/contrib/chat/test/browser/agentSessions/agentHostChatContribution.test.ts | Tests paste variables → simple attachments and restoration back to paste variables. |
| src/vs/workbench/contrib/chat/common/attachments/chatVariableEntries.ts | Introduces paste attachment metadata constants and helpers to create/restore paste variable entries. |
| src/vs/workbench/contrib/chat/common/actions/chatContextKeys.ts | Adds a context key to track a pending delegation target (pre-submit). |
| src/vs/workbench/contrib/chat/browser/widget/input/delegationSessionPickerActionItem.ts | Enables delegation from agent-host sources and tweaks visibility rules for sessions window targets. |
| src/vs/workbench/contrib/chat/browser/widget/input/chatInputPart.ts | Tracks pending delegation target + context key, and centralizes active session-type resolution for delegation. |
| src/vs/workbench/contrib/chat/browser/chatSessions/chatSessions.contribution.ts | After initial send, swaps the UI to newSessionResource when the send commits a new session resource. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentSessions.ts | Adds a generic agent-host delegation command id + request shape; broadens “can continue in” for agent-host targets. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/stateToProgressAdapter.ts | Restores paste attachments back into paste variable entries; adds tooltip for generic simple attachments. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostSessionHandler.ts | Emits paste variables as simple attachments tagged with displayKind: 'paste' and adds extra trace diagnostics. |
| src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostChatContribution.ts | Marks agent-host contributions as delegation-capable in both VS Code and Agents window. |
| src/vs/workbench/contrib/chat/browser/actions/chatExecuteActions.ts | Lets delegation resolve targets by either provider mapping or exact session type id; hides model/mode pickers while pending. |
| src/vs/workbench/contrib/chat/browser/actions/chatContinueInAction.ts | Implements transcript generation/attachment handoff; routes agent-host delegation via generic command or openChatSession. |
| src/vs/sessions/SESSIONS.md | Documents delegation flow in the Agents window architecture notes. |
| src/vs/sessions/contrib/providers/remoteAgentHost/browser/remoteAgentHost.contribution.ts | Enables delegation support for remote agent-host session contributions. |
| src/vs/sessions/contrib/providers/agentHost/browser/baseAgentHostSessionsProvider.ts | Adds trace logging for attached context in provider send path. |
| src/vs/sessions/contrib/providers/agentHost/browser/agentHostSessionConfigPicker.ts | Hides agent-mode picker while a delegation target is pending. |
| src/vs/sessions/contrib/providers/agentHost/browser/agentHostAgentPicker.ts | Hides agent picker while a delegation target is pending. |
| src/vs/sessions/contrib/chat/browser/chat.contribution.ts | Wires in the new Agents-window agent-host delegation command handler. |
| src/vs/sessions/contrib/chat/browser/agentHostDelegation.ts | Implements the generic command handler to create a new session beside the source and send the initial request with attachments. |
| src/vs/platform/extensions/common/extensionsApiProposals.ts | Updates the generated API proposals typing to match current generator output. |
| src/vs/platform/agentHost/test/node/copilotAgentSession.test.ts | Adds test coverage for paste/simple attachment mapping to SDK blob attachments. |
| src/vs/platform/agentHost/node/copilot/copilotAgentSession.ts | Adds attachment summarization helpers + logs for protocol/SDK attachments during send. |
| .github/skills/sessions/SKILL.md | Updates sessions guidance on not collapsing distinct provider identities in pickers. |
Copilot's findings
- Files reviewed: 25/25 changed files
- Comments generated: 3
- Keeps normal pasted chat context as opaque simple attachments so existing paste chips render as before. - Uses delegation transcript metadata, not display kind, to restore transcript handoff attachments. - Updates attachment restore coverage to distinguish tagged transcripts from display-kind-only paste attachments. (Commit message generated by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
- Avoids changing generic restored attachment UI while preserving metadata-based delegation transcript restore. - Keeps normal simple attachment rendering behavior narrowly scoped to the existing generic path. (Commit message generated by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Removes temporary attachment and delegation trace logging added while diagnosing transcript handoff. - Restores the Copilot attachment log to its previous low-detail trace shape. - Reverts the unintended API proposal type change so proposal versions remain supported. (Commit message generated by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Completes the paste attachment request test with the chat turn completion event used by the state-driven test helper. - Keeps the assertion that normal paste variables stay simple attachments without paste display kind. (Commit message generated by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Avoids computing chat initial session options for the Agents Window agent-host delegation path where they are not consumed. - Keeps repository options for paths that pass them through workbench chat session creation. (Commit message generated by Copilot) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This reverts commit b67d77c.
amunger
approved these changes
Jun 17, 2026
DonJayamanne
deleted the
agents/have-a-look-at-https-github-com-microsoft-5c8ec2c5
branch
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Fixes #319819
(Commit message generated by Copilot)