diff --git a/docs/evidence/host-command-activity/README.md b/docs/evidence/host-command-activity/README.md
new file mode 100644
index 00000000..3726058b
--- /dev/null
+++ b/docs/evidence/host-command-activity/README.md
@@ -0,0 +1,21 @@
+# Host command activity response fix
+
+Captured in Chrome on Windows, 1280 × 900, using a built production web bundle and the production Go API with a disposable SQLite database. The offline provider invoked the real `command_runtime` tool under explicitly enabled Full access and the local execution profile. PowerShell printed three fixed verification lines; it exited successfully. No response mocking or DOM edits were used.
+
+Before: `52c7da77fd83251b61d1696735a3d98f521ce37f` web bundle. After: this fix on the same baseline. Both images use the same saved task and command execution:
+
+- Thread: `thread-run-20261021192104-36fa7ee25ab4`
+- Activity: `toolu_391dc09ee2e7d7d1678084ed`
+- Actual API: HTTP 200, `network: "host"`, `status: "completed"`, exit 0, one 87-byte stdout artifact.
+
+| Before | After |
+| --- | --- |
+| ![Execution detail rejected](before.png) | ![Execution detail and output loaded](after.png) |
+
+The before page displayed “执行详情加载失败。” even after Retry. The after page displayed all three output lines and opened the saved stdout:
+
+![Saved stdout opened](after-saved-output.png)
+
+Validation: the added host response and OpenAPI enum assertions failed against the old implementation, then passed after the fix. The disabled network case, unknown network rejection, and raw-field rejection remain covered. Four focused API client cases, the three OpenAPI document/golden/live-route tests, and the production TypeScript/Vite build passed. API TypeScript was regenerated from the Go-produced OpenAPI document. The change expands response parsing to an already supported runtime value; command execution authorization is unchanged.
+
+Screenshots demonstrate the Windows browser flow. The packaged desktop window was not run.
diff --git a/docs/evidence/host-command-activity/after-saved-output.png b/docs/evidence/host-command-activity/after-saved-output.png
new file mode 100644
index 00000000..bdde22c1
Binary files /dev/null and b/docs/evidence/host-command-activity/after-saved-output.png differ
diff --git a/docs/evidence/host-command-activity/after.png b/docs/evidence/host-command-activity/after.png
new file mode 100644
index 00000000..35828a1d
Binary files /dev/null and b/docs/evidence/host-command-activity/after.png differ
diff --git a/docs/evidence/host-command-activity/before.png b/docs/evidence/host-command-activity/before.png
new file mode 100644
index 00000000..e3774f1c
Binary files /dev/null and b/docs/evidence/host-command-activity/before.png differ
diff --git a/docs/openapi.json b/docs/openapi.json
index bc9d0939..7c8145b2 100644
--- a/docs/openapi.json
+++ b/docs/openapi.json
@@ -68418,7 +68418,8 @@
           },
           "network": {
             "enum": [
-              "disabled"
+              "disabled",
+              "host"
             ],
             "type": "string"
           },
diff --git a/internal/browserruntime/ui_evidence_runtime_windows_test.go b/internal/browserruntime/ui_evidence_runtime_windows_test.go
index 8a228c9f..933190bf 100644
--- a/internal/browserruntime/ui_evidence_runtime_windows_test.go
+++ b/internal/browserruntime/ui_evidence_runtime_windows_test.go
@@ -143,14 +143,15 @@ func TestInstalledEdgeUIEvidenceHeadlessMatrixAndRegression(t *testing.T) {
 
 	endpoint := waitForUIEvidenceSmokeEndpoint(t, profilePath, process,
 		artifactDirectory)
-	connection, err := dialRestrictedCDP(t.Context(), endpoint)
+	// Connect and initialize under the same bounded startup deadline.
+	operationContext, cancel := context.WithTimeout(t.Context(), 45*time.Second)
+	defer cancel()
+	connection, err := dialRestrictedCDP(operationContext, endpoint)
 	if err != nil {
 		t.Fatal(err)
 	}
 	client := &restrictedCDPClient{conn: connection, scope: scope,
 		maxRequests: 500, uiEvidence: true}
-	operationContext, cancel := context.WithTimeout(t.Context(), 45*time.Second)
-	defer cancel()
 	if err := client.initialize(operationContext); err != nil {
 		_ = connection.Close()
 		t.Fatalf("initialize real Edge restricted CDP: %v", err)
diff --git a/internal/httpapi/openapi.go b/internal/httpapi/openapi.go
index 406fca61..a44256d0 100644
--- a/internal/httpapi/openapi.go
+++ b/internal/httpapi/openapi.go
@@ -3551,7 +3551,7 @@ var openAPIFieldEnums = map[string][]string{
 	"ThreadActivityToolDetailView.agent_role":                  {string(domain.AgentRoleRoot), string(domain.AgentRoleSpecialist), "unknown"},
 	"ThreadActivityToolDetailView.status":                      {string(domain.SupervisorToolPending), string(domain.SupervisorToolCompleted), string(domain.SupervisorToolDenied), string(domain.SupervisorToolFailed)},
 	"ThreadActivityCommandDetailView.execution_environment":    {"Workspace Sandbox", "Host · Full Access", "Legacy execution boundary"},
-	"ThreadActivityCommandDetailView.network":                  {"disabled"},
+	"ThreadActivityCommandDetailView.network":                  {"disabled", "host"},
 	"ThreadActivityCommandDetailView.status":                   {string(domain.SupervisorToolPending), string(domain.SupervisorToolCompleted), string(domain.SupervisorToolDenied), string(domain.SupervisorToolFailed), string(runner.CommandRuntimeJobPrepared), string(runner.CommandRuntimeJobRunning), string(runner.CommandRuntimeJobStopping), string(runner.CommandRuntimeJobCompleted), string(runner.CommandRuntimeJobFailed), string(runner.CommandRuntimeJobTimedOut), string(runner.CommandRuntimeJobCancelled), string(runner.CommandRuntimeJobKilled), string(runner.CommandRuntimeJobInterrupted)},
 	"IndexView.api_version":                                    {Version},
 	"ProjectActionsView.protocol_version":                      {application.ProjectActionsProtocolVersion},
diff --git a/internal/httpapi/openapi_test.go b/internal/httpapi/openapi_test.go
index 65c24e73..dbf8db40 100644
--- a/internal/httpapi/openapi_test.go
+++ b/internal/httpapi/openapi_test.go
@@ -189,6 +189,8 @@ func TestOpenAPIDocumentIsDeterministicCapabilitySeparatedAndSecretFree(t *testi
 	}
 	assertOpenAPISchemaOptional(t, document.Components.Schemas,
 		"ThreadTranscriptItemView", "activity_detail_ref")
+	assertOpenAPIEnum(t, document.Components.Schemas, "ThreadActivityCommandDetailView", "network",
+		[]string{string(runner.CommandRuntimeNetworkDisabled), string(runner.CommandRuntimeNetworkHost)})
 	for _, field := range []string{"pid", "process_id", "executable", "executable_path",
 		"profile", "profile_path", "devtools_endpoint", "websocket_url", "token",
 		"execution_fence", "authorization_fingerprint"} {
diff --git a/web/src/api/client.test.ts b/web/src/api/client.test.ts
index 01a7c281..f547ab5b 100644
--- a/web/src/api/client.test.ts
+++ b/web/src/api/client.test.ts
@@ -1912,15 +1912,15 @@ describe("APIClient", () => {
       .rejects.toThrow("transcript provenance is invalid");
   });
 
-  it("lazily reads only the strict safe Thread command activity projection", async () => {
+  it.each(["disabled", "host"])("lazily reads the strict Thread command activity projection (%s network)", async (network) => {
     const detail = {
       version: "thread_activity_detail.v2", activity_ref: "call-command-1",
       run_id: "run-created", tools: [{ name: "command_runtime", label: "运行命令",
         agent_id: "agent-root", agent_role: "root", agent_label: "Root Agent", status: "completed",
         started_at: "2026-08-24T00:01:00Z", completed_at: "2026-08-24T00:01:02Z",
         duration_milliseconds: 2_000, detail: { kind: "command", command: { commands: [{ command: "pnpm test session",
-          working_directory: "packages/core", execution_environment: "Workspace Sandbox",
-           network: "disabled", status: "completed", exit_code: 0,
+          working_directory: "packages/core", execution_environment: network === "host" ? "Host · Full Access" : "Workspace Sandbox",
+           network, status: "completed", exit_code: 0,
            duration_milliseconds: 2_000, stdout_preview: "42 tests passed",
            stderr_preview: "", truncated: false, artifacts: [] }] } } }],
     };
@@ -1931,6 +1931,12 @@ describe("APIClient", () => {
       .mockResolvedValueOnce(new Response(JSON.stringify({
         version: "api.v1", request_id: "req-activity-detail-forged",
         data: { ...detail, tools: [{ ...detail.tools[0], environment: { API_KEY: "secret" } }] },
+      }), { status: 200, headers: { "Content-Type": "application/json" } }))
+      .mockResolvedValueOnce(new Response(JSON.stringify({
+        version: "api.v1", request_id: "req-activity-detail-unknown-network",
+        data: { ...detail, tools: [{ ...detail.tools[0], detail: { kind: "command", command: {
+          commands: [{ ...detail.tools[0].detail.command.commands[0], network: "allowlist" }],
+        } } }] },
       }), { status: 200, headers: { "Content-Type": "application/json" } }));
     vi.stubGlobal("fetch", fetchMock);
     const client = new APIClient("read-secret", "/api/v1", "control-secret");
@@ -1939,6 +1945,8 @@ describe("APIClient", () => {
       .resolves.toEqual(detail);
     await expect(client.threadActivityDetail("thread-created", "call-command-1"))
       .rejects.toThrow("tool detail is invalid");
+    await expect(client.threadActivityDetail("thread-created", "call-command-1"))
+      .rejects.toThrow("tool detail is invalid");
     expect(fetchMock.mock.calls[0]?.[0])
       .toBe("/api/v1/threads/thread-created/activities/call-command-1");
   });
diff --git a/web/src/api/client/responses/activity.ts b/web/src/api/client/responses/activity.ts
index 22c6cb09..d10bd8b0 100644
--- a/web/src/api/client/responses/activity.ts
+++ b/web/src/api/client/responses/activity.ts
@@ -94,7 +94,7 @@ export function validThreadActivityCommand(value: unknown): boolean {
     validThreadActivityString(value.command, 4_096) &&
     validThreadActivityString(value.working_directory, 1_024) &&
     threadActivityEnvironments.includes(String(value.execution_environment)) &&
-    value.network === "disabled" &&
+    (value.network === "disabled" || value.network === "host") &&
     threadActivityCommandStatuses.includes(String(value.status)) &&
     (value.exit_code === undefined ||
       (typeof value.exit_code === "number" && Number.isSafeInteger(value.exit_code))) &&
diff --git a/web/src/api/schema.d.ts b/web/src/api/schema.d.ts
index edb57dfd..97ae2278 100644
--- a/web/src/api/schema.d.ts
+++ b/web/src/api/schema.d.ts
@@ -14256,7 +14256,7 @@ export interface components {
             /** Format: int32 */
             exit_code?: number;
             /** @enum {string} */
-            network: "disabled";
+            network: "disabled" | "host";
             /** @enum {string} */
             status: "pending" | "completed" | "denied" | "failed" | "prepared" | "running" | "stopping" | "completed" | "failed" | "timed_out" | "cancelled" | "killed" | "interrupted";
             stderr_preview: string;