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Reconstruct batch 019/124: 2026-08-20 → 2026-08-25 (chat, agenthost, launch skill, sessions) - #19
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…launch skill, sessions) Squashed reconstruction of 52 upstream commits (9ef9bc9..8836b94). 216 files changed, 3081 insertions(+), 1247 deletions(-) chat: - feat(chat): introduce compact codicons and update related components - fix(chat): address PR review feedback on compact codicons - Fix agent sessions midnight test flake (Written by Copilot) (microsoft#332216) - Add harness context to chat telemetry (microsoft#332100) - Chat - ensure that the WorktreeCreateNewBranch is not being shown as a picker in the chat input (microsoft#332239) - Enable Chat Customizations prompt migration by default (microsoft#332262) - chat: keep an agent turn's changes summary from flickering (microsoft#332297) - chat: Avoid duplicate generated image hover previews (microsoft#332322) - Fix underline in `X` (microsoft#332338) agenthost: - agentHost: Map resources through owning connection (microsoft#332088) - agentHost: Clarify Markdown file link formatting (microsoft#332213) - agentHost: add tool invocation telemetry (microsoft#332218) - Clarify Copilot Agent Host identity (microsoft#332240) - Add setting-gated subagent model guidance to the Copilot agent host prompt (microsoft#332089) - Fix false agent-host errors for legacy checkpoints (microsoft#331920) launch skill: - Launch skill: Poll CDP readiness more frequently (microsoft#332190) - Launch skill: Optimize launch debug port allocation (microsoft#332208) - Launch skill: Report startup timing phases (microsoft#332211) - Launch skill: Add prepared-build fast path (microsoft#332214) sessions: - De-flake response selection browser tests (Written by Copilot) (microsoft#332217) - Use descriptionForeground for new session prompt option title detail (microsoft#332260) - sessions: Shorten session action labels (microsoft#332284) - sessions: Preserve side pane size across custom views (microsoft#332337) modernui: - Add function to create editor tab labels and corresponding test for foreground colors - Potential fix for pull request finding - Fix comment extensions/copilot: - Rename auto tiers display names to "Optimize for" (microsoft#332005) - Remove unused code (microsoft#332219) - Bump version to 1.136.0 (microsoft#332243) agent host: - Agent Host: Export debug logs for the active chat (microsoft#332067) - agent host: self-heal Copilot client cold-start config-changed abort (microsoft#332256) - agent host: normalize empty Kerberos proxy SPN to avoid spurious restart (microsoft#332306) editor: - Update snippet.md (microsoft#231790) - Avoid false listener leak warnings for many inputs (microsoft#332253) - Normalize end of line cursor move operation (microsoft#296712) test: - fix(screenshots): update user data migration screenshots for accuracy - error correction instructions (microsoft#249715) modern ui: - Modern UI: Fix CSS specificity for tab action fading - Modern UI: Add tests for action background colors in editor tabs misc: - Fix typo in Settings UI description for editor.selectionHighlightMaxLength (microsoft#332162) - Update endgame notebook milestones to 1.135.0 (microsoft#332242) docs: - docs: remove dead Gitter badge (service shut down June 2023) (microsoft#322702) subagent ux: - subagent ux: fix border, better confirmation, show subagent type (microsoft#332203) server: - Add response headers for remote resources (microsoft#332168) chore: - chore: bump gulp-electron (microsoft#332041) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reconstruct batch 019/124: 2026-08-20 → 2026-08-25 (chat, agenthost, launch skill, sessions)
Overview
9ef9bc91641..8836b94dbc4main, 7 merges)reconstruct/batch-018Upstream PRs
This PR folds in 40 microsoft/vscode PRs.
XSummary of changes by area
chat (9)
a0368214c85)2d8595a3d63)f2180ea0bd4)0052619e71f)db26453d2cd)7c54fda801c)6d1faaf987b)44710170f4a)X(Fix underline inXmicrosoft/vscode#332338) (68beb0ef235)agenthost (6)
493f8124b81)a3397f62a1a)af0071dd538)f96aa07d98b)e1781d11734)a777794c6fe)launch skill (4)
1ad94e270d9)310a3f5c550)8bb368adb82)84aa315a34f)sessions (4)
b41c9d84149)35a289d4483)449d7cc584e)342c6c56db0)modernui (3)
1fbdfa8f105)47adb721cc0)21905a77a52)extensions/copilot (3)
ee6d34f3641)d0686fe12d6)5dc6b4bc933)agent host (3)
b8e7c56d672)ade09f53cb4)7786f1b09c1)editor (3)
dad00c660e0)03e0f5ddfb3)8d4b385871e)test (2)
c8a4f45fe81)e81f312e681)modern ui (2)
5fdeb79b22e)943380021ce)misc (2)
6a7ab60fa79)369a32d0d67)docs (1)
07d17622fdd)subagent ux (1)
60372624bf4)server (1)
75758f1c47a)chore (1)
97bca284d0c)Code changes
Where the changes landed (share of changed files, cumulative)
Largest file changes
package-lock.jsonsrc/vs/platform/agentHost/test/node/copilotAgent.test.tssrc/vs/workbench/contrib/chat/test/browser/widget/chatContentParts/chatSubagentContentPart.test.tssrc/vs/workbench/contrib/modernUI/test/browser/modernUI.contribution.test.tssrc/vs/platform/agentHost/test/node/agentHostToolCallTelemetry.test.tssrc/vs/sessions/contrib/agentFeedback/test/browser/agentFeedbackItemsBackend.test.ts.agents/skills/launch/scripts/launch.shsrc/vs/platform/agentHost/node/copilot/copilotAgent.tssrc/vs/workbench/contrib/chat/browser/widget/chatContentParts/chatSubagentContentPart.ts.agents/skills/launch/scripts/launch.ps1src/vs/workbench/contrib/chat/test/browser/widget/chatContentParts/chatTurnPillsPart.test.ts.agents/skills/launch/scripts/waitForCdp.tssrc/vs/workbench/contrib/chat/test/browser/agentHost/agentHostResponseFileChanges.test.tssrc/vs/workbench/contrib/notebook/common/notebookCommon.tssrc/vs/platform/agentHost/test/node/toolInstructions.test.tssrc/vs/workbench/contrib/chat/test/browser/exportAgentHostDebugLogs.test.tssrc/vs/workbench/contrib/chat/browser/attachments/chatAttachmentWidgets.tssrc/vs/workbench/contrib/chat/browser/actions/exportAgentHostDebugLogsAction.tssrc/vs/platform/agentHost/node/copilot/prompts/toolInstructions.tssrc/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostResponseFileChanges.tssrc/vs/workbench/contrib/chat/browser/agentSessions/agentHost/stateToProgressAdapter.tsextensions/vscode-api-tests/testWorkspace/test.ipynbextensions/copilot/src/extension/tools/node/editFileHealing.tsxsrc/vs/platform/agentHost/test/node/agentHostPromptRegistry.test.tssrc/vs/workbench/contrib/chat/browser/chatIcons.tssrc/vs/sessions/test/browser/workbench.test.tssrc/vs/platform/agentHost/node/agentHostTelemetryReporter.tssrc/vs/workbench/contrib/chat/common/model/chatViewModel.tssrc/vs/workbench/contrib/chat/test/browser/chatIcons.test.tssrc/vs/workbench/contrib/chat/browser/widget/media/chat.csssrc/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostSessionHandler.tssrc/vs/workbench/contrib/notebook/browser/contrib/profile/notebookProfile.tssrc/vs/platform/agentHost/test/node/protocolServerHandler.test.tssrc/vs/workbench/contrib/chat/test/browser/agentSessions/convertCarouselAnswers.test.tssrc/vs/workbench/contrib/notebook/browser/media/notebook.csssrc/vs/workbench/contrib/chat/browser/widget/chatContentParts/chatSubagentOpenChat.tsextensions/copilot/src/extension/prompts/node/panel/workspace/workspaceStructure.tsxsrc/vs/workbench/contrib/chat/test/browser/widget/chatContentParts/chatAttachmentsContentPart.test.tssrc/vs/workbench/services/preferences/common/preferences.tssrc/vs/platform/actions/browser/dropdownActionViewItemWithKeybinding.tsAll commits
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(microsoft#332338)97bca284d0c342c6c56db06e2918434858836b94dbc4🤖 Generated with Claude Code