[pull] main from microsoft:main

.github/workflows/pr-linux-cli-test.yml

@@ -11,7 +11,7 @@ on:
 jobs:
   linux-cli-test:
     name: ${{ inputs.job_name }}
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=linux-cli-test-${{ inputs.job_name }}-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     env:
       RUSTUP_TOOLCHAIN: ${{ inputs.rustup_toolchain }}
     steps:

.github/workflows/pr-node-modules.yml

@@ -10,7 +10,7 @@ permissions: {}
 jobs:
   compile:
     name: Compile
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=compile-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     steps:
       - name: Checkout microsoft/vscode
         uses: actions/checkout@v6
@@ -86,7 +86,7 @@ jobs:
 
   linux:
     name: Linux
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=linux-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     env:
       NPM_ARCH: x64
       VSCODE_ARCH: x64
@@ -219,7 +219,7 @@ jobs:
 
   windows:
     name: Windows
-    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-windows-2022-x64 ]
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-windows-2022-x64, "JobId=windows-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     env:
       NPM_ARCH: x64
       VSCODE_ARCH: x64

.github/workflows/pr-win32-test.yml

@@ -17,7 +17,7 @@ on:
 jobs:
   windows-test:
     name: ${{ inputs.job_name }}
-    runs-on: windows-2022
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-windows-2022-x64, "JobId=windows-test-${{ inputs.job_name }}-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     env:
       ARTIFACT_NAME: ${{ (inputs.electron_tests && 'electron') || (inputs.browser_tests && 'browser') || (inputs.remote_tests && 'remote') || 'unknown' }}
       NPM_ARCH: x64

.github/workflows/pr.yml

@@ -19,7 +19,7 @@ env:
 jobs:
   compile:
     name: Compile & Hygiene
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=compile-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     steps:
       - name: Checkout microsoft/vscode
         uses: actions/checkout@v6
@@ -159,7 +159,7 @@ jobs:
 
   copilot-check-test-cache:
     name: Copilot - Check Test Cache
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=copilot-check-test-cache-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     permissions:
       contents: read
       pull-requests: read
@@ -205,7 +205,7 @@ jobs:
 
   copilot-check-telemetry:
     name: Copilot - Check Telemetry
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=copilot-check-telemetry-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     permissions:
       contents: read
     steps:
@@ -224,7 +224,7 @@ jobs:
 
   copilot-linux-tests:
     name: Copilot - Test (Linux)
-    runs-on: ubuntu-22.04
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-ubuntu-22.04-x64, "JobId=copilot-linux-tests-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     permissions:
       contents: read
     steps:
@@ -329,7 +329,7 @@ jobs:
 
   copilot-windows-tests:
     name: Copilot - Test (Windows)
-    runs-on: windows-2022
+    runs-on: [ self-hosted, 1ES.Pool=1es-vscode-oss-windows-2022-x64, "JobId=copilot-windows-tests-${{ github.run_id }}-${{ github.run_number }}-${{ github.run_attempt }}" ]
     permissions:
       contents: read
     steps:

.vscode/settings.json

@@ -2,7 +2,6 @@
 	// --- Chat ---
 	"inlineChat.enableV2": true,
 	"inlineChat.affordance": "editor",
-	"inlineChat.renderMode": "hover",
 	"chat.tools.terminal.autoApprove": {
 		"scripts/test.bat": true,
 		"scripts/test.sh": true,

extensions/copilot/assets/prompts/skills/agent-customization/SKILL.md

@@ -72,7 +72,7 @@ After creating:
 
 **Skill vs Custom Agent?** Same capabilities for all steps → Skill. Need context isolation (subagent returns single output) or different tool restrictions per stage → Custom Agent.
 
-**Hooks vs Instructions?** Instructions *guide* agent behavior (non-deterministic). Hooks *enforce* behavior via shell commands at lifecycle events like `PreToolUse` or `PostToolUse` — they can block operations, require approval, or run formatters deterministically. See [hooks reference](./references/hooks.md).
+**Hooks vs Instructions?** Instructions *guide* agent behavior (non-deterministic). Hooks *enforce* behavior via shell commands at lifecycle events like `PreToolUse` or `PostToolUse` — they can block operations, require approval, or run formatters deterministically. Hooks can be defined in standalone `.json` files (see [hooks reference](./references/hooks.md)) or inline in custom agent frontmatter via the `hooks` attribute (see [agents reference](./references/agents.md)).
 
 ## Common Pitfalls
 

extensions/copilot/assets/prompts/skills/agent-customization/references/agents.md

@@ -22,6 +22,13 @@ agents: [agent1, agent2]     # Optional, restrict allowed subagents by name (omi
 user-invocable: true         # Optional, show in agent picker (default: true)
 disable-model-invocation: false  # Optional, prevent subagent invocation (default: false)
 handoffs: [...]              # Optional, transitions to other agents
+hooks:                       # Optional, inline hooks for this agent's lifecycle events
+  PreToolUse:
+    - type: command
+      command: "./scripts/validate.sh"
+  PostToolUse:
+    - type: command
+      command: "./scripts/format.sh"
 ---
 ```
 
@@ -108,4 +115,31 @@ You are a specialist at {specific task}. Your job is to {clear purpose}.
 - **Swiss-army agents**: Too many tools, tries to do everything
 - **Vague descriptions**: "A helpful agent" doesn't guide delegation—be specific
 - **Role confusion**: Description doesn't match body persona
-- **Circular handoffs**: A → B → A without progress criteria
+- **Circular handoffs**: A → B → A without progress criteria
+
+## Inline Hooks
+
+Custom agents support inline `hooks` in frontmatter. These hooks execute shell commands at agent lifecycle points and are scoped to this agent only. The format matches standalone hook files (see [hooks reference](../hooks.md)).
+
+### Supported Events
+
+`SessionStart`, `UserPromptSubmit`, `PreToolUse`, `PostToolUse`, `PreCompact`, `SubagentStart`, `SubagentStop`, `Stop`
+
+### Example
+
+```yaml
+---
+description: "Secure code reviewer that blocks dangerous commands"
+tools: [read, search, execute]
+hooks:
+  PreToolUse:
+    - type: command
+      command: "./scripts/block-dangerous-cmds.sh"
+      timeout: 10
+  PostToolUse:
+    - type: command
+      command: "./scripts/auto-lint.sh"
+---
+```
+
+Each hook command supports: `type` (must be `command`), `command`, platform overrides (`windows`, `linux`, `osx`), `cwd`, `env`, `timeout`.

extensions/copilot/package.json

@@ -3776,6 +3776,15 @@
 							"onExp"
 						]
 					},
+					"github.copilot.chat.responsesApi.toolSearchTool.enabled": {
+						"type": "boolean",
+						"default": false,
+						"markdownDescription": "%github.copilot.config.responsesApi.toolSearchTool.enabled%",
+						"tags": [
+							"experimental",
+							"onExp"
+						]
+					},
 					"github.copilot.chat.updated53CodexPrompt.enabled": {
 						"type": "boolean",
 						"default": true,

extensions/copilot/package.nls.json

@@ -344,6 +344,7 @@
 	"github.copilot.config.responsesApiReasoningSummary": "Sets the reasoning summary style used for the Responses API. Requires `#github.copilot.chat.useResponsesApi#`.",
 	"github.copilot.config.responsesApiContextManagement.enabled": "Enables context management for the Responses API. Requires `#github.copilot.chat.useResponsesApi#`.",
 	"github.copilot.config.responsesApi.promptCacheKey.enabled": "Enables prompt cache key being set for the Responses API.",
+	"github.copilot.config.responsesApi.toolSearchTool.enabled": "Enable tool search for OpenAI Responses API models. When enabled, tools are dynamically discovered and loaded on-demand using embeddings-based search, reducing context window usage when many tools are available.",
 	"github.copilot.config.updated53CodexPrompt.enabled": "Enables the updated prompt for gpt-5.3-codex model.",
 	"github.copilot.config.gpt54ConcisePrompt.enabled": "Enables the concise prompt experiment for gpt-5.4 model.",
 	"github.copilot.config.gpt54LargePrompt.enabled": "Enables the large prompt experiment for gpt-5.4 model.",