diff --git a/packages/ai/CHANGELOG.md b/packages/ai/CHANGELOG.md
index ff016809e..9d75c9d39 100644
--- a/packages/ai/CHANGELOG.md
+++ b/packages/ai/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed Codex WebSocket tool-result turns replaying full history when the preceding tool-call ID required Responses API normalization ([#7279](https://github.com/can1357/oh-my-pi/issues/7279)).
+
 ## [17.2.3] - 2026-08-01
 
 ### Added
diff --git a/packages/ai/src/providers/openai-codex-responses.ts b/packages/ai/src/providers/openai-codex-responses.ts
index a58409222..28493a443 100644
--- a/packages/ai/src/providers/openai-codex-responses.ts
+++ b/packages/ai/src/providers/openai-codex-responses.ts
@@ -2279,12 +2279,15 @@ class CodexStreamProcessor {
 				resetCodexWebSocketAppendState(state);
 			} else {
 				state.lastRequest = structuredCloneJSON(runtime.requestBodyForState);
-				if (responseId) {
+				const replayableResponseItems = sanitizeOpenAIResponsesAssistantHistoryItemsForReplay(
+					structuredCloneJSON(runtime.nativeOutputItems),
+				);
+				if (responseId && replayableResponseItems) {
 					state.lastResponseId = responseId;
-					state.lastResponseItems = stripInputItemIds(structuredCloneJSON(runtime.nativeOutputItems));
+					state.lastResponseItems = replayableResponseItems;
 					state.canAppend = rawEvent.type === "response.done" || rawEvent.type === "response.completed";
 				} else {
-					// Without a response id the append baseline cannot be trusted.
+					// Without both a response id and replayable output, the append baseline cannot be trusted.
 					state.canAppend = false;
 				}
 			}
@@ -3005,14 +3008,6 @@ export function getOpenAICodexTransportDetails(
 	};
 }
 
-function stripInputItemIds(items: Array<Record<string, unknown>>): InputItem[] {
-	return items.map(item => {
-		if (item.id == null) return item as InputItem;
-		const { id: _id, ...rest } = item;
-		return rest as InputItem;
-	});
-}
-
 const codexDiagnosticsTextEncoder = new TextEncoder();
 
 function jsonByteLength(value: unknown): number {
diff --git a/packages/ai/test/openai-codex-stream.test.ts b/packages/ai/test/openai-codex-stream.test.ts
index b0a372ef1..04fb599cb 100644
--- a/packages/ai/test/openai-codex-stream.test.ts
+++ b/packages/ai/test/openai-codex-stream.test.ts
@@ -3375,6 +3375,151 @@ describe("openai-codex streaming", () => {
 		});
 	});
 
+	it("chains websocket tool output after normalizing an oversized call id", async () => {
+		const tempDir = TempDir.createSync("@pi-codex-stream-");
+		setAgentDir(tempDir.path());
+		const sentRequests: Array<Record<string, unknown>> = [];
+		const longCallId = `call_${"x".repeat(80)}`;
+
+		class NormalizedCallIdWebSocket extends MockWebSocket {
+			constructor(url: string, options?: WsOptions) {
+				super(url, options);
+				this.scheduleOpen();
+			}
+
+			send(data: string): void {
+				sentRequests.push(JSON.parse(data) as Record<string, unknown>);
+				if (sentRequests.length === 1) {
+					this.sendJson({
+						type: "response.output_item.added",
+						item: {
+							type: "function_call",
+							id: "fc_oversized",
+							call_id: longCallId,
+							name: "read_file",
+							arguments: "",
+						},
+					});
+					this.sendJson({
+						type: "response.output_item.done",
+						item: {
+							type: "function_call",
+							id: "fc_oversized",
+							call_id: longCallId,
+							name: "read_file",
+							arguments: '{"path":"README.md"}',
+						},
+					});
+					this.sendJson({
+						type: "response.completed",
+						response: { id: "resp_tool", status: "completed", usage: DEFAULT_USAGE },
+					});
+					return;
+				}
+				this.emitCodexResponse({
+					messageId: "msg_done",
+					responseId: "resp_done",
+					text: "Done",
+					terminalType: "response.completed",
+				});
+			}
+		}
+
+		global.WebSocket = NormalizedCallIdWebSocket as unknown as typeof WebSocket;
+		const model = createCodexTestModel("https://chatgpt.com/backend-api");
+		const providerSessionState = new Map<string, ProviderSessionState>();
+		const firstUser = { role: "user" as const, content: "Read the file", timestamp: Date.now() };
+		const options = {
+			apiKey: createCodexTestToken(),
+			fetch: vi.fn(async () => {
+				throw new Error("SSE fallback should not be called");
+			}) as FetchImpl,
+			providerSessionState,
+			sessionId: "ws-normalized-call-id",
+		};
+
+		const firstResponse = await streamOpenAICodexResponses(
+			model,
+			{ systemPrompt: ["You are a helpful assistant."], messages: [firstUser] },
+			options,
+		).result();
+		const toolCall = firstResponse.content.find(
+			(block): block is Extract<(typeof firstResponse.content)[number], { type: "toolCall" }> =>
+				block.type === "toolCall",
+		);
+		if (!toolCall) throw new Error("expected a tool call");
+		const toolResult = {
+			role: "toolResult" as const,
+			toolCallId: toolCall.id,
+			toolName: toolCall.name,
+			content: [{ type: "text" as const, text: "file contents" }],
+			isError: false,
+			timestamp: Date.now(),
+		};
+
+		await streamOpenAICodexResponses(
+			model,
+			{
+				systemPrompt: ["You are a helpful assistant."],
+				messages: [firstUser, firstResponse, toolResult],
+			},
+			options,
+		).result();
+
+		expect(sentRequests).toHaveLength(2);
+		expect(sentRequests[1]?.previous_response_id).toBe("resp_tool");
+		expect(sentRequests[1]?.input).toEqual([
+			expect.objectContaining({
+				type: "function_call_output",
+				output: "file contents",
+			}),
+		]);
+	});
+
+	it("does not enable websocket append state for a non-replayable response", async () => {
+		const tempDir = TempDir.createSync("@pi-codex-stream-");
+		setAgentDir(tempDir.path());
+
+		class NonReplayableResponseWebSocket extends MockWebSocket {
+			constructor(url: string, options?: WsOptions) {
+				super(url, options);
+				this.scheduleOpen();
+			}
+
+			send(): void {
+				this.sendJson({
+					type: "response.completed",
+					response: {
+						id: "resp_empty",
+						status: "incomplete",
+						incomplete_details: { reason: "max_output_tokens" },
+						usage: DEFAULT_USAGE,
+					},
+				});
+			}
+		}
+
+		global.WebSocket = NonReplayableResponseWebSocket as unknown as typeof WebSocket;
+		const model = createCodexTestModel("https://chatgpt.com/backend-api");
+		const providerSessionState = new Map<string, ProviderSessionState>();
+		const result = await streamOpenAICodexResponses(model, createCodexTestContext(), {
+			apiKey: createCodexTestToken(),
+			fetch: vi.fn(async () => {
+				throw new Error("SSE fallback should not be called");
+			}) as FetchImpl,
+			providerSessionState,
+			sessionId: "ws-non-replayable-response",
+		}).result();
+
+		expect(result.stopReason).toBe("length");
+		expect(
+			getOpenAICodexTransportDetails(model, {
+				providerSessionState,
+				sessionId: "ws-non-replayable-response",
+			}).canAppend,
+		).toBe(false);
+	});
+
 	it("drops a stale terminal frame from the prior response leaking onto a reused websocket", async () => {
 		const tempDir = TempDir.createSync("@pi-codex-stale-frame-");
 		setAgentDir(tempDir.path());