diff --git a/packages/typescript/src/__tests__/comma-separated-action-params.test.ts b/packages/typescript/src/__tests__/comma-separated-action-params.test.ts
new file mode 100644
index 0000000000000..9e6f2a3b067ba
--- /dev/null
+++ b/packages/typescript/src/__tests__/comma-separated-action-params.test.ts
@@ -0,0 +1,155 @@
+/**
+ * Regression test: action params must be extracted from standalone XML blocks
+ * when the LLM outputs actions as a comma-separated list.
+ *
+ * The LLM may respond with:
+ *   <actions>REPLY,START_CODING_TASK</actions>
+ *   <START_CODING_TASK>
+ *     <repo>https://github.com/org/repo</repo>
+ *     <agents>claude:Fix auth | codex:Write tests</agents>
+ *   </START_CODING_TASK>
+ *
+ * The XML parser puts "START_CODING_TASK" as a top-level key on parsedXml.
+ * extractStandaloneActionParams collects these into the legacy flat format
+ * that parseActionParams can consume downstream.
+ */
+
+import { describe, expect, it } from "vitest";
+import { parseActionParams } from "../actions";
+import {
+	extractStandaloneActionParams,
+	RESERVED_XML_KEYS,
+} from "../services/message";
+
+// ---------------------------------------------------------------------------
+// extractStandaloneActionParams
+// ---------------------------------------------------------------------------
+
+describe("extractStandaloneActionParams", () => {
+	it("extracts params from a matching parsedXml key", () => {
+		const parsedXml = {
+			actions: "REPLY,START_CODING_TASK",
+			thought: "Spawning agents",
+			START_CODING_TASK:
+				"<repo>https://github.com/org/repo</repo><task>Fix it</task>",
+		};
+		const result = extractStandaloneActionParams(
+			["REPLY", "START_CODING_TASK"],
+			parsedXml,
+		);
+		expect(result).toContain("<START_CODING_TASK>");
+		expect(result).toContain("<repo>https://github.com/org/repo</repo>");
+		expect(result).toContain("<task>Fix it</task>");
+	});
+
+	it("matches action names case-insensitively", () => {
+		const parsedXml = {
+			start_coding_task: "<task>Fix</task>",
+		};
+		const result = extractStandaloneActionParams(
+			["START_CODING_TASK"],
+			parsedXml,
+		);
+		expect(result).toContain("<START_CODING_TASK>");
+		expect(result).toContain("<task>Fix</task>");
+	});
+
+	it("skips reserved keys even if they match action names", () => {
+		const parsedXml = {
+			actions: "REPLY",
+			thought: "something",
+			text: "<bold>hello</bold>",
+		};
+		const result = extractStandaloneActionParams(
+			["actions", "thought", "text"],
+			parsedXml,
+		);
+		expect(result).toBe("");
+	});
+
+	it("skips keys that do not contain XML (plain text values)", () => {
+		const parsedXml = {
+			MY_ACTION: "just a plain string without XML",
+		};
+		const result = extractStandaloneActionParams(["MY_ACTION"], parsedXml);
+		expect(result).toBe("");
+	});
+
+	it("handles multiple actions with params", () => {
+		const parsedXml = {
+			START_CODING_TASK: "<repo>https://github.com/org/repo</repo>",
+			FINALIZE_WORKSPACE: "<workspaceId>ws-123</workspaceId>",
+		};
+		const result = extractStandaloneActionParams(
+			["START_CODING_TASK", "FINALIZE_WORKSPACE"],
+			parsedXml,
+		);
+		expect(result).toContain("<START_CODING_TASK>");
+		expect(result).toContain("<FINALIZE_WORKSPACE>");
+	});
+
+	it("returns empty string when no matches found", () => {
+		const result = extractStandaloneActionParams(["REPLY", "NONE"], {});
+		expect(result).toBe("");
+	});
+});
+
+// ---------------------------------------------------------------------------
+// RESERVED_XML_KEYS
+// ---------------------------------------------------------------------------
+
+describe("RESERVED_XML_KEYS", () => {
+	it("includes standard response schema fields", () => {
+		expect(RESERVED_XML_KEYS.has("actions")).toBe(true);
+		expect(RESERVED_XML_KEYS.has("thought")).toBe(true);
+		expect(RESERVED_XML_KEYS.has("text")).toBe(true);
+		expect(RESERVED_XML_KEYS.has("simple")).toBe(true);
+		expect(RESERVED_XML_KEYS.has("providers")).toBe(true);
+	});
+});
+
+// ---------------------------------------------------------------------------
+// parseActionParams integration (end-to-end with the assembled format)
+// ---------------------------------------------------------------------------
+
+describe("parseActionParams with standalone action block format", () => {
+	it("extracts params from assembled <ACTION_NAME>...</ACTION_NAME> format", () => {
+		// This is the format that extractStandaloneActionParams produces
+		const paramsXml = `<START_CODING_TASK>
+			<repo>https://github.com/org/repo</repo>
+			<agents>claude:Fix auth | codex:Write tests</agents>
+			<task>Fix the login bug</task>
+		</START_CODING_TASK>`;
+
+		const result = parseActionParams(paramsXml);
+		expect(result.has("START_CODING_TASK")).toBe(true);
+
+		const params = result.get("START_CODING_TASK");
+		expect(params).toBeTruthy();
+		expect(params?.repo).toBe("https://github.com/org/repo");
+		expect(params?.agents).toBe("claude:Fix auth | codex:Write tests");
+		expect(params?.task).toBe("Fix the login bug");
+	});
+
+	it("handles multiple action blocks", () => {
+		const paramsXml = `<START_CODING_TASK>
+			<repo>https://github.com/org/repo</repo>
+			<task>Fix bugs</task>
+		</START_CODING_TASK>
+		<FINALIZE_WORKSPACE>
+			<workspaceId>ws-123</workspaceId>
+		</FINALIZE_WORKSPACE>`;
+
+		const result = parseActionParams(paramsXml);
+		expect(result.has("START_CODING_TASK")).toBe(true);
+		expect(result.has("FINALIZE_WORKSPACE")).toBe(true);
+		expect(result.get("START_CODING_TASK")?.task).toBe("Fix bugs");
+		expect(result.get("FINALIZE_WORKSPACE")?.workspaceId).toBe("ws-123");
+	});
+
+	it("returns empty map for empty input", () => {
+		expect(parseActionParams("").size).toBe(0);
+		expect(parseActionParams(undefined).size).toBe(0);
+		expect(parseActionParams(null).size).toBe(0);
+	});
+});
diff --git a/packages/typescript/src/services/message.ts b/packages/typescript/src/services/message.ts
index 70ceeee13f32d..685c9d55a6403 100644
--- a/packages/typescript/src/services/message.ts
+++ b/packages/typescript/src/services/message.ts
@@ -49,6 +49,51 @@ import {
 	hasFirstSentence,
 } from "../utils/text-splitting";
 
+/**
+ * Reserved XML response keys that are NOT action names.
+ * Used when scanning parsedXml for standalone action param blocks.
+ */
+export const RESERVED_XML_KEYS = new Set([
+	"actions",
+	"thought",
+	"text",
+	"simple",
+	"providers",
+]);
+
+/**
+ * Extract action params from standalone XML blocks in a parsedXml object.
+ *
+ * When the LLM outputs `<actions>REPLY,START_CODING_TASK</actions>` alongside
+ * `<START_CODING_TASK><repo>...</repo></START_CODING_TASK>`, the XML parser
+ * puts the action block as a top-level key on parsedXml. This function finds
+ * those keys and assembles them into the legacy flat params format that
+ * `parseActionParams` consumes.
+ *
+ * Returns the assembled params string, or empty string if none found.
+ */
+export function extractStandaloneActionParams(
+	actionNames: string[],
+	parsedXml: Record<string, unknown>,
+): string {
+	const fragments: string[] = [];
+	for (const actionName of actionNames) {
+		const upperName = actionName.toUpperCase();
+		const matchingKey = Object.keys(parsedXml).find(
+			(k) => k.toUpperCase() === upperName,
+		);
+		if (
+			matchingKey &&
+			!RESERVED_XML_KEYS.has(matchingKey.toLowerCase()) &&
+			typeof parsedXml[matchingKey] === "string" &&
+			(parsedXml[matchingKey] as string).includes("<")
+		) {
+			fragments.push(`<${upperName}>${parsedXml[matchingKey]}</${upperName}>`);
+		}
+	}
+	return fragments.join("\n");
+}
+
 /**
  * Escape Handlebars syntax in a string to prevent template injection.
  *
@@ -332,35 +377,33 @@ export class DefaultMessageService implements IMessageService {
 														"nova";
 
 													let audioBuffer: Buffer | null = null;
-														const params: TextToSpeechParams & {
-															model?: string;
-														} = {
-															text: first,
-															voice: voiceId,
-															model: model,
-														};
-														const result = runtime.getModel(
-															ModelType.TEXT_TO_SPEECH,
-														)
-															? await runtime.useModel(
-																	ModelType.TEXT_TO_SPEECH,
-																	params,
-																)
-															: undefined;
-
-														if (
-															result instanceof ArrayBuffer ||
-															Object.prototype.toString.call(result) ===
-																"[object ArrayBuffer]"
-														) {
-															audioBuffer = Buffer.from(result as ArrayBuffer);
-														} else if (Buffer.isBuffer(result)) {
-															audioBuffer = result;
-														} else if (result instanceof Uint8Array) {
-															audioBuffer = Buffer.from(result);
-														}
-
-
+													const params: TextToSpeechParams & {
+														model?: string;
+													} = {
+														text: first,
+														voice: voiceId,
+														model: model,
+													};
+													const result = runtime.getModel(
+														ModelType.TEXT_TO_SPEECH,
+													)
+														? await runtime.useModel(
+																ModelType.TEXT_TO_SPEECH,
+																params,
+															)
+														: undefined;
+
+													if (
+														result instanceof ArrayBuffer ||
+														Object.prototype.toString.call(result) ===
+															"[object ArrayBuffer]"
+													) {
+														audioBuffer = Buffer.from(result as ArrayBuffer);
+													} else if (Buffer.isBuffer(result)) {
+														audioBuffer = result;
+													} else if (result instanceof Uint8Array) {
+														audioBuffer = Buffer.from(result);
+													}
 
 													if (audioBuffer && callback) {
 														const audioBase64 = audioBuffer.toString("base64");
@@ -1661,10 +1704,24 @@ export class DefaultMessageService implements IMessageService {
 						}
 					}
 					// Legacy comma-separated format
-					return actionsXml
+					const commaSplitActions = actionsXml
 						.split(",")
 						.map((action) => String(action).trim())
 						.filter((action) => action.length > 0);
+
+					// Extract params from standalone action blocks in parsedXml
+					// (e.g. <START_CODING_TASK><repo>...</repo></START_CODING_TASK>).
+					if (!parsedXml.params || parsedXml.params === "") {
+						const assembled = extractStandaloneActionParams(
+							commaSplitActions,
+							parsedXml as Record<string, unknown>,
+						);
+						if (assembled) {
+							parsedXml.params = assembled;
+						}
+					}
+
+					return commaSplitActions;
 				}
 				if (Array.isArray(parsedXml.actions)) {
 					return parsedXml.actions as string[];