fix: Make planning output output markdown instead of a tool block

src/provider/stream-map.ts

@@ -124,6 +124,17 @@ function toolResultObj(
 /** Cursor's file-edit tool surfaces with this name (its `toolCall.type`). */
 const EDIT_TOOL_NAME = "edit";
 
+/** Cursor plan-mode tool; markdown lives in call args, result is empty. */
+const CREATE_PLAN_TOOL_NAME = "createPlan";
+
+function isCreatePlanTool(name: string): boolean {
+	return name === CREATE_PLAN_TOOL_NAME;
+}
+
+function createPlanContent(input: unknown): string | undefined {
+	return strField(input, "plan");
+}
+
 function isRecord(v: unknown): v is Record<string, unknown> {
 	return typeof v === "object" && v !== null;
 }
@@ -285,9 +296,10 @@ function mapTodos(args: unknown): Array<{ content: string; status: string }> {
 /**
  * Cursor tool name → opencode native tool adapter. Cursor tools without a
  * natural opencode counterpart (`delete`, `mcp`, `semSearch`, `readLints`,
- * `generateImage`, `createPlan`, `recordScreen`, `task`) are intentionally
- * absent and fall through to generic `cursor_*` blocks. `edit` is handled
- * separately (its native call input depends on the diff in the result).
+ * `generateImage`, `recordScreen`) are intentionally absent and fall through
+ * to generic `cursor_*` blocks. `edit` and `createPlan` are handled separately
+ * (edit: native call input depends on the diff in the result; createPlan:
+ * emitted as assistant markdown text so opencode renders it like a normal plan).
  */
 const NATIVE_ADAPTERS: Record<string, NativeToolAdapter> = {
 	// Cursor `shell` → opencode `bash` (console renderer).
@@ -743,10 +755,11 @@ interface OpenToolCall {
 interface BlockToolState {
 	open: Map<string, OpenToolCall>;
 	pendingEdits: Map<string, string>;
+	dropped: Set<string>;
 }
 
 function newBlockToolState(): BlockToolState {
-	return { open: new Map(), pendingEdits: new Map() };
+	return { open: new Map(), pendingEdits: new Map(), dropped: new Set() };
 }
 
 /** Parts to emit for a blocks-mode `tool-call` event (edits are buffered). */
@@ -991,6 +1004,20 @@ export function cursorEventsToStream(
 							reasoningLine(event.text);
 							break;
 						case "tool-call":
+							if (isCreatePlanTool(event.name)) {
+								const plan = createPlanContent(event.input);
+								if (plan) {
+									closeReasoning();
+									streamedText = true;
+									controller.enqueue({
+										type: "text-delta",
+										id: ensureText(),
+										delta: plan,
+									});
+								}
+								toolState.dropped.add(event.id);
+								break;
+							}
 							if (toolDisplay === "blocks") {
 								const parts = blockToolCallParts(
 									event.id,
@@ -1015,6 +1042,7 @@ export function cursorEventsToStream(
 							}
 							break;
 						case "tool-result":
+							if (toolState.dropped.delete(event.id)) break;
 							if (toolDisplay === "blocks") {
 								const parts = blockToolResultParts(
 									event.id,
@@ -1109,6 +1137,12 @@ export async function cursorEventsToContent(
 					reasoning += event.text;
 					break;
 				case "tool-call":
+					if (isCreatePlanTool(event.name)) {
+						const plan = createPlanContent(event.input);
+						if (plan) text += plan;
+						toolState.dropped.add(event.id);
+						break;
+					}
 					if (toolDisplay === "blocks") {
 						for (const part of blockToolCallParts(
 							event.id,
@@ -1123,6 +1157,7 @@ export async function cursorEventsToContent(
 					}
 					break;
 				case "tool-result":
+					if (toolState.dropped.delete(event.id)) break;
 					if (toolDisplay === "blocks") {
 						for (const part of blockToolResultParts(
 							event.id,

test/stream-map.test.ts

@@ -1239,6 +1239,125 @@ describe("native tool mapping (blocks)", () => {
 	});
 });
 
+describe("createPlan mapping", () => {
+	const PLAN = "# Plan\n\n- step one\n- step two";
+
+	it("emits createPlan markdown as assistant text, not a tool block", async () => {
+		const events: CursorEvent[] = [
+			{
+				type: "tool-call",
+				id: "p1",
+				name: "createPlan",
+				input: { plan: PLAN },
+			},
+			{
+				type: "tool-result",
+				id: "p1",
+				name: "createPlan",
+				result: { status: "success", value: {} },
+				isError: false,
+			},
+			{ type: "finish" },
+		];
+		const parts = await collect(cursorEventsToStream(gen(events), "blocks"));
+
+		expect(types(parts)).not.toContain("tool-call");
+		expect(types(parts)).not.toContain("tool-result");
+		const text = parts
+			.filter(
+				(p): p is Extract<LanguageModelV3StreamPart, { type: "text-delta" }> =>
+					p.type === "text-delta",
+			)
+			.map((p) => p.delta)
+			.join("");
+		expect(text).toBe(PLAN);
+	});
+
+	it("closes reasoning before emitting the plan as text", async () => {
+		const events: CursorEvent[] = [
+			{ type: "reasoning-delta", text: "thinking" },
+			{
+				type: "tool-call",
+				id: "p1",
+				name: "createPlan",
+				input: { plan: PLAN },
+			},
+			{
+				type: "tool-result",
+				id: "p1",
+				name: "createPlan",
+				result: { status: "success", value: {} },
+				isError: false,
+			},
+			{ type: "finish" },
+		];
+		const parts = await collect(cursorEventsToStream(gen(events), "blocks"));
+		expect(types(parts)).toEqual([
+			"stream-start",
+			"reasoning-start",
+			"reasoning-delta",
+			"reasoning-end",
+			"text-start",
+			"text-delta",
+			"text-end",
+			"finish",
+		]);
+	});
+
+	it("does not duplicate finish.text when the plan was already streamed", async () => {
+		const events: CursorEvent[] = [
+			{
+				type: "tool-call",
+				id: "p1",
+				name: "createPlan",
+				input: { plan: PLAN },
+			},
+			{
+				type: "tool-result",
+				id: "p1",
+				name: "createPlan",
+				result: { status: "success", value: {} },
+				isError: false,
+			},
+			{ type: "finish", text: PLAN },
+		];
+		const parts = await collect(cursorEventsToStream(gen(events), "blocks"));
+		const text = parts
+			.filter(
+				(p): p is Extract<LanguageModelV3StreamPart, { type: "text-delta" }> =>
+					p.type === "text-delta",
+			)
+			.map((p) => p.delta)
+			.join("");
+		expect(text).toBe(PLAN);
+	});
+
+	it("maps createPlan to text content in doGenerate", async () => {
+		const { content } = await cursorEventsToContent(
+			gen([
+				{
+					type: "tool-call",
+					id: "p1",
+					name: "createPlan",
+					input: { plan: PLAN },
+				},
+				{
+					type: "tool-result",
+					id: "p1",
+					name: "createPlan",
+					result: { status: "success", value: {} },
+					isError: false,
+				},
+				{ type: "finish" },
+			]),
+			"blocks",
+		);
+		expect(content.find((c) => c.type === "tool-call")).toBeUndefined();
+		expect(content.find((c) => c.type === "tool-result")).toBeUndefined();
+		expect(content).toMatchObject([{ type: "text", text: PLAN }]);
+	});
+});
+
 describe("mapUsage", () => {
 	it("maps Cursor usage into the V3 nested shape", () => {
 		expect(