diff --git a/dist/live-checkpoint-ClPCSdrW.js b/dist/live-checkpoint-ClPCSdrW.js
index 243c9d13bcba520923b63adfddad75cf2d94362d..336a1699b80b9e99416f9da4346ca73ee2ad1626 100644
--- a/dist/live-checkpoint-ClPCSdrW.js
+++ b/dist/live-checkpoint-ClPCSdrW.js
@@ -1532,7 +1532,7 @@ const ZED_TAG_KEYS = /* @__PURE__ */ new Set([
 	"RedactedThinking",
 	"ToolUse"
 ]);
-const MAP_OBJECT_PATHS = /* @__PURE__ */ new Set(["request_token_usage", "messages.Agent.tool_results"]);
+const MAP_OBJECT_PATHS = /* @__PURE__ */ new Set(["request_token_usage", "messages.Agent.tool_results", "acpx.session_options.env"]);
 const OPAQUE_VALUE_PATHS = /* @__PURE__ */ new Set([
 	"agent_capabilities",
 	"messages.Agent.content.ToolUse.input",
@@ -2557,7 +2557,7 @@ function readCommandLineChar(state) {
 		escaping: false,
 		hasPart: true
 	};
-	if (state.ch === "\\" && state.quote !== "'") return {
+	if (process.platform !== "win32" && state.ch === "\\" && state.quote !== "'") return {
 		current: state.current,
 		quote: state.quote,
 		escaping: true,
@@ -3959,7 +3959,24 @@ var AcpClient = class {
-		this.attachAgentLifecycleObservers(child);
+		this.attachAgentLifecycleObservers(child);
+		if (this.options.onAgentSpawn) {
+			try {
+				if (typeof child.pid !== "number" || child.pid <= 0) {
+					throw new Error("ACPX agent spawn did not expose a valid process id.");
+				}
+				await this.options.onAgentSpawn({ pid: child.pid, startedAt: this.agentStartedAt });
+			} catch (error) {
+				try {
+					child.kill("SIGKILL");
+				} catch {}
+				throw error;
+			}
+		}
 		const startupStderr = [];
 		child.stderr.on("data", (chunk) => {
 			this.captureStartupStderr(startupStderr, chunk);
+			if (this.options.onAgentStderr) {
+				this.options.onAgentStderr(chunk.toString());
+				return;
+			}
 			if (!this.options.verbose) return;
 			process.stderr.write(chunk);
 		});
@@ -3994,7 +4011,7 @@ var AcpClient = class {
 			geminiAcp: isGeminiAcpCommand(spawnCommand, args),
 			copilotAcp: isCopilotAcpCommand(spawnCommand, args),
 			claudeAcp: isClaudeAcpCommand(spawnCommand, args),
-			spawnOptions: buildAgentSpawnOptions(this.options.cwd, this.options.authCredentials, this.options.sessionOptions?.env)
+			spawnOptions: buildAgentSpawnOptions(this.options.spawnCwd ?? this.options.cwd, this.options.authCredentials, this.options.sessionOptions?.env)
 		};
 	}
 	logAgentLaunch(plan) {
diff --git a/dist/runtime.d.ts b/dist/runtime.d.ts
index ccdbe5b032521518022223733049b8b38793473b..3d4e04231e78efeecd8540735b08e1e43547ff2d 100644
--- a/dist/runtime.d.ts
+++ b/dist/runtime.d.ts
@@ -266,6 +266,9 @@ type AcpRuntimeOptions = {
   timeoutMs?: number;
   probeAgent?: string;
   verbose?: boolean;
+  onAgentStderr?: (chunk: string) => void;
+  onAgentSpawn?: (meta: { pid: number; startedAt: string }) => Promise<void>;
+  spawnCwd?: string;
   onPermissionRequest?: (req: AcpPermissionRequest, ctx: {
     signal: AbortSignal;
   }) => Promise<AcpPermissionDecision | undefined>;
diff --git a/dist/runtime.js b/dist/runtime.js
index 6c9cc999e50a11c399c68b3a0f1b7af4bc2317c0..33b5054b2906502d1d4b512bfa259bd2ba5a9f05 100644
--- a/dist/runtime.js
+++ b/dist/runtime.js
@@ -744,7 +744,8 @@ var AcpRuntimeManager = class {
 		this.deps = deps;
 	}
 	createClient(options) {
-		return this.deps.clientFactory?.(options) ?? new AcpClient(options);
+		const clientOptions = { ...options, onAgentStderr: this.options.onAgentStderr, onAgentSpawn: this.options.onAgentSpawn, spawnCwd: this.options.spawnCwd };
+		return this.deps.clientFactory?.(clientOptions) ?? new AcpClient(clientOptions);
 	}
 	async readPendingPersistentClient(record, options) {
 		const pendingClient = this.pendingPersistentClients.get(record.acpxRecordId);
diff --git a/dist/session-options-jkYbBxGE.d.ts b/dist/session-options-jkYbBxGE.d.ts
index 9d37f377fb6a0828e0d2bc5a48754f3aa71509a4..680bc080fc5d6ffd266ed1b27d3d5056add9d980 100644
--- a/dist/session-options-jkYbBxGE.d.ts
+++ b/dist/session-options-jkYbBxGE.d.ts
@@ -84,6 +84,9 @@ type AcpClientOptions = {
   terminal?: boolean;
   suppressSdkConsoleErrors?: boolean;
   verbose?: boolean;
+  onAgentStderr?: (chunk: string) => void;
+  onAgentSpawn?: (meta: { pid: number; startedAt: string }) => Promise<void>;
+  spawnCwd?: string;
   sessionOptions?: {
     model?: string;
     allowedTools?: string[];