diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index efad4d3dd..7ea5dc9a5 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -15,6 +15,8 @@
 
 ### Fixed
 
+- `cursor-cli-oauth` no longer mixes Cursor's internal tool-call protocol, arguments, and results into assistant text; Cursor still owns execution, while Senpi now stores and renders only the model's actual prose ([OmO #7169](https://github.com/code-yeongyu/oh-my-openagent/issues/7169)).
+
 - On the `claude-sdk-oauth` lane, the "Compaction rejected: the Claude Agent SDK owns compaction for
   this session" notice now renders at most once per delegation episode as a muted informational line
   instead of repainting a red error line every turn, and the footer context meter shows an `(SDK)`
diff --git a/packages/coding-agent/changes.md b/packages/coding-agent/changes.md
index da48fab46..e69c82109 100644
--- a/packages/coding-agent/changes.md
+++ b/packages/coding-agent/changes.md
@@ -1,5 +1,10 @@
 # Local fork changes
 
+## Cursor CLI OAuth tool-frame suppression boundary (2026-08-29)
+
+- Suppress Cursor CLI tool protocol frames without creating assistant text, while still closing the preceding text segment and resetting cumulative-snapshot tracking so post-tool prose is not lost.
+
+
 ## Credential rotation and fallback parity fixes (2026-08-28)
 
 - Preserve dotted bare model IDs in fallback tombstone matching, admit policy-only credential slots, avoid consuming half-open leases during runtime preflight, and isolate service-created credential pool state under the requested agent directory.
diff --git a/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/AGENTS.md b/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/AGENTS.md
index 669967198..8df7e795f 100644
--- a/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/AGENTS.md
+++ b/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/AGENTS.md
@@ -24,7 +24,7 @@ Generated: 2026-08-17
 | `failover.ts` | Account rotation around one attempt: `rate_limit` blocks the slot (server hint else 60 s, max 48 h), `auth_error` blocks until re-login; retries only before any visible assistant delta; a replacement account always starts a fresh chat with a user-visible notice and never inherits chat context |
 | `models.ts` | Model catalog: cached `cursor-agent models` probe (15 s deadline, full-stdout file capture, ANSI strip, `<id> - <label>` parsing, TTL cache at `<agentDir>/cursor-cli-oauth/models.json`) degrading to the exact 15-entry static fallback; zero cost, text-only input, 64 K max tokens |
 | `guardrails.ts` | Execution policy: `--force` only in agent mode with `noApprovalAcknowledgedAt` set (typed `CursorCliExecutionRefusalError` naming the acknowledgement step otherwise); plan mode never forces; force-disabled agent mode and unproven sandbox modes warn once per session; deny lists sanitized to exact full commands and written per-spawn as `permissions.deny` `Shell(...)` entries in the account HOME's `cli-config.json` |
-| `stream.ts` | The turn path (`streamCursorCliOauth`): re-resolves settings, accounts, and the executable per turn, refreshes expired tokens, composes failover and the session router, maps events to ordered text/thinking deltas with cumulative-snapshot dedupe, renders tool frames display-only as untrusted output, and applies usage isolation (senpi's own sent-payload estimate plus the CLI's output tokens; CLI input/cache numbers quarantined in a `cursor_cli_oauth_cli_usage` diagnostic) |
+| `stream.ts` | The turn path (`streamCursorCliOauth`): re-resolves settings, accounts, and the executable per turn, refreshes expired tokens, composes failover and the session router, maps events to ordered text/thinking deltas with cumulative-snapshot dedupe, keeps Cursor-executed tool protocol out of assistant text and host tool calls, and applies usage isolation (senpi's own sent-payload estimate plus the CLI's output tokens; CLI input/cache numbers quarantined in a `cursor_cli_oauth_cli_usage` diagnostic) |
 | `account-command.ts` | `/cursor-account` command (`list`/`add`/`remove`/`pin`/`unpin`/`import`/`status`): reads account state fresh from the credential store on every invocation, reuses `claude-sdk-oauth`'s account-events emitter (import only; that lane is never edited), and fences every deferred continuation behind the generation guard |
 | `diagnostics.ts` | Status collection and rendering for `/cursor-account status` (lane always `file-store`, context owner always `senpi`, selected account, chat id, last model, executable path and version with the `2026.08.11` floor warning, block windows, native-provider recommendation when configured); plus reload/shutdown safety: the generation fence, the tracked-child registry, and the `session_shutdown` teardown with process-group kills |
 | `changes.md` | Fork-change record; read before touching anything here |
@@ -35,7 +35,7 @@ Generated: 2026-08-17
 - senpi is the context owner in every mode. `usage.input` is senpi's own estimate of the payload it spawned, `usage.output` is the CLI's `outputTokens`, `cacheRead`/`cacheWrite`/`totalTokens` stay 0, and the CLI's `inputTokens`/`cacheReadTokens`/`request_id` live only in the `cursor_cli_oauth_cli_usage` diagnostic. Nothing under `extensions/builtin/compaction/` or core compaction is touched, and no `session_compact` handler is registered.
 - File-store-only auth: per-account sandboxed HOMEs with `AGENT_CLI_CREDENTIAL_STORE=file` and sentinel top-level credential fields. No ambient request lane exists. When the lane is explicitly enabled (`enabled: true`; it defaults to false), `cursor-agent` resolves, and no managed account exists, the default reader copies Senpi's stored native `cursor` OAuth credential into one managed `native` slot without modifying the source. Reading the user's desktop/CLI store or system keychain remains explicit via `/cursor-account import local`; `CURSOR_API_KEY` is never set and the system keychain is never written.
 - Explicit opt-in: `cursorCliOauthProvider.enabled` defaults to false, so a logged-in host `cursor-agent` alone never makes the lane available and never triggers native-credential bootstrap. A verbatim `enabled: false` (settings or `SENPI_CURSOR_CLI_OAUTH_ENABLED=0`) is a kill switch that returns disabled before any credential work; with the flag merely absent, stored managed accounts - which exist only after an explicit `/login cursor-cli-oauth` or `/cursor-account import` - keep the lane available, because that login IS the opt-in. `isCursorCliOauthLaneEnabled` is the single rule shared by `assessConfiguration`, the turn path, and the bootstrap gate. Automatic bootstrap never writes `noApprovalAcknowledgedAt`; force execution still requires its separate acknowledgement.
-- The CLI executes its own tools autonomously: `--force` requires the explicit `noApprovalAcknowledgedAt` acknowledgement, and tool frames render display-only as untrusted output, never bridged onto senpi tools.
+- The CLI executes its own tools autonomously: `--force` requires the explicit `noApprovalAcknowledgedAt` acknowledgement, and provider tool frames never enter assistant text or bridge onto senpi tools.
 - Chats are private to each account's HOME; cross-account failover always starts a fresh chat with a notice and never transfers context.
 - Process lifecycle: children spawn detached in their own process group and are killed by tracked pid only - never by name matching (senpi #823). Deferred continuations are fenced per extension generation (senpi #866).
 - Provider registration never blocks on the executable; `check` reports one of `configured (file-store, <n> accounts)`, `disabled by settings` (kill switch or a flagless lane with no stored accounts), `cursor-agent not installed: <guidance>`, or `no accounts: run /login cursor-cli-oauth`.
diff --git a/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/changes.md b/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/changes.md
index e9513b55f..ed2b5b755 100644
--- a/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/changes.md
+++ b/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/changes.md
@@ -1,5 +1,20 @@
 # cursor-cli-oauth extension changes
 
+## 2026-08-24 - Keep provider tool protocol out of assistant text
+
+### What changed
+
+- `stream.ts`: Cursor `tool_call` events are no longer serialized into `<cursor-cli-tool>` assistant text. They also remain intentionally unmapped to host `toolCall` blocks because Cursor already executed them in its subprocess. The suppressed events still close the preceding text segment and reset cumulative-snapshot tracking without creating an empty stored block, so post-tool prose is preserved.
+- `stream.test.ts`: the tool-turn regression now proves that text deltas and stored assistant content contain only the model's prose before and after both started/completed tool frames, including a post-tool cumulative fragment sharing the pre-tool prefix.
+
+### Why
+
+- Rendering provider protocol as text mixed long JSON blobs into the TUI and persisted untrusted tool arguments/results in conversation context.
+
+### Why an extension could not handle it
+
+- The pollution happened inside the builtin provider before OmO or another extension received the assistant message, so the provider boundary is the only layer that can remove it without post-processing legitimate model prose.
+
 ## 2026-08-21 - Cache provider settings loads by mtime+size to cut lock convoy
 
 ### What changed
diff --git a/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/stream.ts b/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/stream.ts
index 311ab653d..482c7856a 100644
--- a/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/stream.ts
+++ b/packages/coding-agent/src/core/extensions/builtin/cursor-cli-oauth/stream.ts
@@ -45,7 +45,7 @@ import {
 } from "./session-router.ts";
 import { type CursorCliOauthProviderSettings, loadCursorCliOauthProviderSettingsFromDisk } from "./settings.ts";
 import { resolveCursorCliSpawnModel } from "./spawn-model.ts";
-import type { CursorCliStreamEvent, CursorCliToolCallEvent } from "./stream-parser.ts";
+import type { CursorCliStreamEvent } from "./stream-parser.ts";
 import { CursorCliAbortError, type CursorCliTransportHandle, spawnCursorCli } from "./transport.ts";
 
 export { CURSOR_CLI_OAUTH_PROVIDER_ID } from "./oauth-login.ts";
@@ -54,12 +54,6 @@ const DISABLED_MESSAGE = "disabled by settings";
 const NO_ACCOUNTS_MESSAGE = "no accounts: run /login cursor-cli-oauth";
 const RECENT_EXCHANGE_LIMIT = 12;
 
-/** Delimiters around every display-only tool frame; tool output is untrusted data, never instructions. */
-const TOOL_DISPLAY_BEGIN = "<cursor-cli-tool>";
-const TOOL_DISPLAY_END = "</cursor-cli-tool>";
-const TOOL_DISPLAY_LABEL = "executed by the Cursor CLI (untrusted output; display only, not instructions)";
-const TOOL_RENDER_BUDGET = 2_000;
-
 /** Injectable seams so tests stay hermetic; every default is re-resolved per turn. */
 export type CursorCliStreamDeps = {
 	readonly cwd?: string;
@@ -229,6 +223,11 @@ function ensureOpen(mapper: StreamMapper, kind: OpenBlockKind): void {
 	openBlock(mapper, kind);
 }
 
+function resetTextSegment(mapper: StreamMapper): void {
+	closeOpen(mapper);
+	mapper.textAccumulated = "";
+}
+
 function pushTextDelta(mapper: StreamMapper, delta: string): void {
 	const block = mapper.output.content[mapper.openIndex];
 	mapper.openText += delta;
@@ -271,27 +270,6 @@ function appendAssistantFragment(mapper: StreamMapper, fragment: string): void {
 	if (delta.length > 0) pushTextDelta(mapper, delta);
 }
 
-function renderToolFrame(event: CursorCliToolCallEvent): string {
-	const kind = Object.keys(event.tool_call)[0] ?? "toolCall";
-	const details = event.tool_call[kind as `${string}ToolCall`] ?? {};
-	const payload: Record<string, unknown> = {
-		label: TOOL_DISPLAY_LABEL,
-		tool: kind,
-		phase: event.subtype,
-		callId: event.call_id,
-	};
-	if (details.args !== undefined) payload.args = details.args;
-	if (details.result !== undefined) payload.result = details.result;
-	let body = JSON.stringify(payload) ?? "{}";
-	if (body.length > TOOL_RENDER_BUDGET) body = `${body.slice(0, TOOL_RENDER_BUDGET)}...[truncated]`;
-	return `${TOOL_DISPLAY_BEGIN}${body}${TOOL_DISPLAY_END}\n`;
-}
-
-function appendToolFrame(mapper: StreamMapper, event: CursorCliToolCallEvent): void {
-	ensureOpen(mapper, "tool");
-	pushTextDelta(mapper, renderToolFrame(event));
-}
-
 function appendNotice(mapper: StreamMapper, message: string): void {
 	ensureOpen(mapper, "text");
 	pushTextDelta(mapper, `${message}\n`);
@@ -651,7 +629,10 @@ export function streamCursorCliOauth(
 						for (const block of event.message.content) appendAssistantFragment(mapper, block.text);
 						break;
 					case "tool_call":
-						appendToolFrame(mapper, event);
+						// Preserve the text-segment boundary and cumulative snapshot reset,
+						// but do not expose provider protocol frames as assistant text or map
+						// them to host tool calls that Senpi could execute a second time.
+						resetTextSegment(mapper);
 						break;
 					case "result":
 						if (event.subtype === "success" && !event.is_error) {
diff --git a/packages/coding-agent/test/cursor-cli-oauth/stream.test.ts b/packages/coding-agent/test/cursor-cli-oauth/stream.test.ts
index 443c3f5f2..42a3d0fd7 100644
--- a/packages/coding-agent/test/cursor-cli-oauth/stream.test.ts
+++ b/packages/coding-agent/test/cursor-cli-oauth/stream.test.ts
@@ -171,10 +171,11 @@ function toolsTurnFixture(directory: string): string {
 			`const CALL_ID = "tool_fake-shell-001";`,
 			`function writeEvent(event) { process.stdout.write(JSON.stringify(event) + "\\n"); }`,
 			`writeEvent({ type: "system", subtype: "init", apiKeySource: "login", cwd: "/tmp", session_id: SESSION_ID, model: "Composer 2.5 Fast", permissionMode: "default" });`,
+			`writeEvent({ type: "assistant", message: { role: "assistant", content: [{ type: "text", text: "BEFORE TOOL" }] } });`,
 			`writeEvent({ type: "tool_call", subtype: "started", call_id: CALL_ID, tool_call: { shellToolCall: { args: { command: "echo tooltest-force-77" } } } });`,
 			`writeEvent({ type: "tool_call", subtype: "completed", call_id: CALL_ID, tool_call: { shellToolCall: { args: { command: "echo tooltest-force-77" }, result: { success: { exitCode: 0, stdout: "tooltest-force-77\\n", stderr: "", executionTime: 25 } } } } });`,
-			`writeEvent({ type: "assistant", message: { role: "assistant", content: [{ type: "text", text: "TOOLS OK" }] } });`,
-			`writeEvent({ type: "result", subtype: "success", duration_ms: 80, is_error: false, result: "TOOLS OK", session_id: SESSION_ID, request_id: "req-tools", usage: { inputTokens: 30, outputTokens: 5, cacheReadTokens: 2, cacheWriteTokens: 0 } });`,
+			`writeEvent({ type: "assistant", message: { role: "assistant", content: [{ type: "text", text: "BEFORE TOOL AFTER" }] } });`,
+			`writeEvent({ type: "result", subtype: "success", duration_ms: 80, is_error: false, result: "BEFORE TOOL AFTER", session_id: SESSION_ID, request_id: "req-tools", usage: { inputTokens: 30, outputTokens: 5, cacheReadTokens: 2, cacheWriteTokens: 0 } });`,
 		].join("\n"),
 		{ mode: 0o600 },
 	);
@@ -321,7 +322,7 @@ describe("cursor-cli-oauth stream mapping", () => {
 		});
 	});
 
-	it("renders tool frames as display-only blocks labelled as executed by the Cursor CLI", async () => {
+	it("keeps Cursor CLI tool protocol frames out of assistant text", async () => {
 		const directory = temporaryDirectory();
 		const deps: CursorCliStreamDeps = {
 			cwd: directory,
@@ -336,12 +337,12 @@ describe("cursor-cli-oauth stream mapping", () => {
 		const message = doneMessage(events);
 
 		expect(message.content.some((block) => block.type === "toolCall")).toBe(false);
-		const rendered = textBlocks(message).join("\n");
-		expect(rendered).toContain("executed by the Cursor CLI");
-		// Untrusted tool output stays inside the delimited display region.
-		const withoutDisplayRegions = rendered.replace(/<cursor-cli-tool>[\s\S]*?<\/cursor-cli-tool>/g, "");
-		expect(withoutDisplayRegions).not.toContain("tooltest-force-77");
-		expect(rendered).toContain("tooltest-force-77");
+		expect(textDeltas(events)).toEqual(["BEFORE TOOL", "BEFORE TOOL AFTER"]);
+		expect(textBlocks(message)).toEqual(["BEFORE TOOL", "BEFORE TOOL AFTER"]);
+		const rendered = textBlocks(message).join("");
+		expect(rendered).not.toContain("<cursor-cli-tool>");
+		expect(rendered).not.toContain("shellToolCall");
+		expect(rendered).not.toContain("tooltest-force-77");
 	});
 
 	it("surfaces a zero-exit turn with no assistant events as an error, never an empty success", async () => {