Aug 28, 2026 – Sep 3, 2026

fix(ext/node): allow repeated child process signalsTypeScript · 68 + / 27 −

Introduces 3 new declarations in ext/node/polyfills/internal/child_process.ts.

Adds new language design rather than adjusting what was there. Tests changed with it, with code of their own.

ext/node/polyfills/internal/child_process.ts ↗ · 2 files

@@ -873,20 +890,19 @@ class ChildProcess extends EventEmitter {       }     } -    /* Cancel any pending IPC I/O */-    if (this[kCanDisconnect]) {-      this.disconnect?.();+    if (isWindows) {+      // See the `#windowsSignalFallback` use in the status handler above.+      this.#windowsSignalFallback = signalName;+    }+    if (signalName === "SIGKILL") {+      this[kSigkillIssued] = true;     }-     this.killed = true;-    this.signalCode = signalName;     return true;   }    [SymbolDispose]() {-    if (!this.killed) {-      this.kill();-    }+    this.kill();   }    ref() {

[Fix] Sparse TikToken tokenizers silently failPython · 113 + / 70 −

Introduces 4 new declarations in src/transformers/tokenization_utils_tokenizers.py.

Adds new core implementation rather than adjusting what was there. Tests changed with it, with code of their own.

src/transformers/tokenization_utils_tokenizers.py ↗ · 3 files

@@ -325,6 +269,102 @@ def _iter_special_tokens(values: Iterable[Any]) -> list[str]:             local_kwargs["merges"] = merges         return local_kwargs +    @classmethod+    def _convert_from_tiktoken(cls, vocab_file: str, local_kwargs: dict[str, Any]) -> dict[str, Any]:+        """Path to a vocab file and a list of extra special tokens."""+        from .convert_slow_tokenizer import TikTokenConverter++        # `added_tokens_decoder` is a (token_id -> token) dict of tokens that may not be contiguous+        added_tokens_decoder: dict[int, str] = {+            int(token_id): token["content"] if isinstance(token, dict) else str(token)+            for token_id, token in (local_kwargs.get("added_tokens_decoder") or {}).items()+        }+        # `extra_special_tokens` is a list of tokens to append to the base vocabulary+        extra_special_tokens: list[str] = local_kwargs.get("extra_special_tokens") or []+        if isinstance(extra_special_tokens, dict):+            extra_special_tokens = list(extra_special_tokens.keys())++        # Retrieve the vocab size from the vocab file+        base_vocab_size = len(TikTokenConverter.load_tiktoken_bpe(vocab_file))++        # If any of the tokens in `added_tokens_decoder` are not in the base vocabulary, they need to be added. To do so+        # we bake them in the `extra_special_tokens` list, with placeholder if `added_tokens_decoder` is not contiguous+        max_added_token_id = max(added_tokens_decoder.keys()) if added_tokens_decoder else 0+        if max_added_token_id >= base_vocab_size:+            new_extras = [+                added_tokens_decoder.get(index, f"<|reserved_token_{index}|>")+                for index in range(base_vocab_size, max_added_token_id + 1)+            ]+            set_new_extras = set(new_extras)+            for special_token in extra_special_tokens:+                if special_token not in set_new_extras:+                    new_extras.append(special_token)

Activate Python environments in Agent Host shell commands with shell init scriptsTypeScript · 618 + / 16 −

Introduces 21 new declarations in src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostShellInitSynchronizer.ts.

Adds new core implementation rather than adjusting what was there. Tests changed with it, with code of their own.

src/vs/workbench/contrib/chat/browser/agentSessions/agentHost/agentHostShellInitSynchronizer.ts ↗ · 28 files

@@ -0,0 +1,183 @@+/*---------------------------------------------------------------------------------------------+ *  Copyright (c) Microsoft Corporation. All rights reserved.+ *  Licensed under the MIT License. See License.txt in the project root for license information.+ *--------------------------------------------------------------------------------------------*/++import { RunOnceScheduler } from '../../../../../../base/common/async.js';+import { structuralEquals } from '../../../../../../base/common/equals.js';+import { Disposable, DisposableStore, IDisposable, toDisposable } from '../../../../../../base/common/lifecycle.js';+import { isWindows } from '../../../../../../base/common/platform.js';+import { URI } from '../../../../../../base/common/uri.js';+import { IAgentHostService } from '../../../../../../platform/agentHost/common/agentService.js';+import { AgentHostShellToolInitScriptEnabledSettingId } from '../../../../../../platform/agentHost/common/copilotCliConfig.js';+import { SessionConfigKey } from '../../../../../../platform/agentHost/common/sessionConfigKeys.js';+import { createShellInitScript, type IShellInitScript, type ShellInitScriptShell } from '../../../../../../platform/agentHost/common/shellInitScript.js';+import { IAgentSubscription } from '../../../../../../platform/agentHost/common/state/agentSubscription.js';+import { ActionType } from '../../../../../../platform/agentHost/common/state/protocol/actions.js';+import { SessionState } from '../../../../../../platform/agentHost/common/state/sessionState.js';+import { IConfigurationService } from '../../../../../../platform/configuration/common/configuration.js';+import { InstantiationType, registerSingleton } from '../../../../../../platform/instantiation/common/extensions.js';+import { createDecorator } from '../../../../../../platform/instantiation/common/instantiation.js';+import { IWorkspaceContextService, IWorkspaceFolder } from '../../../../../../platform/workspace/common/workspace.js';+import { IEnvironmentVariableService } from '../../../../terminal/common/environmentVariable.js';+import { IWorkbenchEnvironmentService } from '../../../../../services/environment/common/environmentService.js';++const PYTHON_ENV_EXTENSION_ID = 'ms-python.vscode-python-envs';+// Only the variable matching the tool shell: the extension publishes+// shell-specific activation, so no cross-shell fallback is read.+const PYTHON_ACTIVATION_VARIABLES: readonly string[] = isWindows+	? ['VSCODE_PYTHON_PWSH_ACTIVATE']+	: ['VSCODE_PYTHON_BASH_ACTIVATE'];+const TOOL_SHELL: ShellInitScriptShell = isWindows ? 'powershell' : 'bash';++export const IAgentHostShellInitSynchronizer = createDecorator<IAgentHostShellInitSynchronizer>('agentHostShellInitSynchronizer');

mtmd: support DeepSeek-V4-Flash-Vision-ExpC++ · 396 + / 5 −

Introduces 4 new declarations in tools/mtmd/clip.cpp.

Adds new runtime rather than adjusting what was there. Read the linked PR for the surrounding test context.

tools/mtmd/clip.cpp ↗ · 13 files

@@ -5021,6 +5069,58 @@ bool clip_encode(struct clip_ctx * ctx, struct clip_encode_params * params) {                 }                 set_input_i32("pos_w", pos_data);             } break;+        case PROJECTOR_TYPE_DEEPSEEK4V:+            {+                // set the 2D positions (mrope layout, only the first 2 channels are used)+                int n_patches_per_row = image_size_width / patch_size;+                std::vector<int32_t> positions(n_pos * 4, 0);+                for (int i = 0; i < n_pos; i++) {+                    positions[i]         = i / n_patches_per_row; // row+                    positions[n_pos + i] = i % n_patches_per_row; // col+                }+                set_input_i32("positions", positions);++                // token block layout index (see clip_graph_deepseek4v::build)+                // rows [0, n_grid) are the aligner output, the sentinels follow+                const int n_merge = hparams.n_merge;+                const int n_llm_w = CLIP_ALIGN(pos_w, n_merge) / n_merge;+                const int n_llm_h = CLIP_ALIGN(pos_h, n_merge) / n_merge;+                const int n_grid  = n_llm_w * n_llm_h;+                const int idx_start   = n_grid;+                const int idx_end     = n_grid + 1;+                const int idx_newline = n_grid + 2;+                const int idx_pad     = n_grid + 3;++                const int lead_pad = imgs.entries[0].lead_pad;+                const auto bl = dsv4_get_block_layout(n_llm_w, n_llm_h, lead_pad);++                std::vector<int32_t> idx;+                idx.reserve(bl.n_out);+                for (int i = 0; i < lead_pad; i++) {+                    idx.push_back(idx_pad);+                }

agentHost: classify inline chat telemetryTypeScript · 48 + / 21 −

Introduces 2 new declarations in src/vs/platform/agentHost/node/agentHostTelemetryReporter.ts.

Adds new core implementation rather than adjusting what was there. Tests changed with it, with code of their own.

src/vs/platform/agentHost/node/agentHostTelemetryReporter.ts ↗ · 7 files

@@ -24,16 +24,18 @@ import { AgentHostClientConnectionKind, AgentHostLaunchKind, AgentHostTransportK export type AgentHostUserMessageSentSource = 'direct' | 'queued';  /**- * Who produced the message that started a turn. Extends the protocol's- * {@link MessageKind} with `agentMerge`: Agent Merge drives its repair turns- * with a host-generated message that carries the `systemNotification` origin,- * and reporting those under their own value keeps automated merge work- * separable from turns a person or an agent asked for.+ * The message origin used for telemetry. Extends the protocol's+ * {@link MessageKind} with host-owned classifications for Agent Merge repair+ * turns and VS Code sessions marked ephemeral, which telemetry reports as+ * `inline`.  */-export type AgentHostMessageOriginTelemetryKind = MessageKind | 'agentMerge';+export type AgentHostMessageOriginTelemetryKind = MessageKind | 'agentMerge' | 'inline'; -/** Classifies the actor that produced a turn's message for telemetry. */-export function getMessageOriginTelemetryKind(message: Message): AgentHostMessageOriginTelemetryKind {+/** Classifies a turn's message origin, including host-owned session classifications. */+export function getMessageOriginTelemetryKind(message: Message, isEphemeralSession: boolean): AgentHostMessageOriginTelemetryKind {+	if (isEphemeralSession) {+		return 'inline';+	} 	// The marker only counts on the origin the host stamps it with, so a client 	// cannot dress a user message up as automated merge work. 	if (message.origin.kind === MessageKind.SystemNotification && isAgentMergeMessage(message)) {

discovery: graduate declarative validation to stableGo · 25 + / 52 −

Reworks 25 lines of existing logic in pkg/apis/discovery/validation/validation.go.

Changes how existing systems design behaves. Tests changed with it, with code of their own.

pkg/apis/discovery/validation/validation.go ↗ · 9 files

@@ -202,18 +187,6 @@ func validatePorts(endpointPorts []discovery.EndpointPort, fldPath *field.Path) 	return allErrs } -func validateAddressType(addressType discovery.AddressType) field.ErrorList {-	allErrs := field.ErrorList{}--	if addressType == "" {-		allErrs = append(allErrs, field.Required(field.NewPath("addressType"), "").MarkCoveredByDeclarative())-	} else if !supportedAddressTypes.Has(addressType) {-		allErrs = append(allErrs, field.NotSupported(field.NewPath("addressType"), addressType, sets.List(supportedAddressTypes)).MarkCoveredByDeclarative())-	}--	return allErrs-}- func validateHints(endpointHints *discovery.EndpointHints, fldPath *field.Path) field.ErrorList { 	allErrs := field.ErrorList{} 

[rust-compiler] Propagate block lowering errorsRust · 38 + / 27 −

Introduces 1 new declaration in compiler/crates/react_compiler_lowering/src/build_hir.rs.

Adds new language design rather than adjusting what was there. Read the linked PR for the surrounding test context.

compiler/crates/react_compiler_lowering/src/build_hir.rs ↗ · 2 files

@@ -2589,17 +2588,25 @@ fn lower_block_statement(     block: &react_compiler_ast::statements::BlockStatement,     parent_scope: Option<react_compiler_ast::scope::ScopeId>, ) -> Result<(), CompilerError> {-    let _ = lower_block_statement_inner(builder, block, None, parent_scope);-    Ok(())+    Ok(lower_block_statement_inner(+        builder,+        block,+        None,+        parent_scope,+    )?) }  fn lower_block_statement_with_scope(     builder: &mut HirBuilder,     block: &react_compiler_ast::statements::BlockStatement,     scope_override: react_compiler_ast::scope::ScopeId, ) -> Result<(), CompilerError> {-    let _ = lower_block_statement_inner(builder, block, Some(scope_override), None);-    Ok(())+    Ok(lower_block_statement_inner(+        builder,+        block,+        Some(scope_override),+        None,+    )?) }  fn lower_block_statement_inner(