revert #6130: doesn't really work well

packages/coding-agent/src/eval/agent-bridge.ts

@@ -7,7 +7,6 @@ import {
 	runStructuredSubagent,
 	StructuredSubagentError,
 	type StructuredSubagentSchemaMode,
-	toStructuredSubagentIsolationControls,
 } from "../task/structured-subagent";
 import type { AgentProgress, SingleResult } from "../task/types";
 import type { NestedRepoPatch } from "../task/worktree";
@@ -15,7 +14,6 @@ import type { ToolSession } from "../tools";
 import { ToolError } from "../tools/tool-errors";
 import { withBridgeTimeoutPause } from "./bridge-timeout";
 import type { JsStatusEvent } from "./js/shared/types";
-
 // Import review tools for side effects (registers subagent tool handlers).
 import "../tools/review";
 
@@ -132,7 +130,14 @@ export async function runEvalAgent(args: unknown, options: EvalAgentBridgeOption
 			`agent() blocked: turn token budget exhausted (${turnBudget.spent}/${turnBudget.total} output tokens). Raise or drop the +Nk! ceiling to continue.`,
 		);
 	}
-	const isolation = toStructuredSubagentIsolationControls(parsed);
+	const isolation =
+		Object.hasOwn(parsed, "isolated") || Object.hasOwn(parsed, "apply") || Object.hasOwn(parsed, "merge")
+			? {
+					...(parsed.isolated !== undefined ? { requested: parsed.isolated } : {}),
+					...(parsed.merge === false ? { merge: "patch" as const } : {}),
+					...(parsed.apply !== undefined ? { apply: parsed.apply } : {}),
+				}
+			: undefined;
 
 	try {
 		const execution = await withBridgeTimeoutPause(