diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index a4d66e8d2..ba17d3964 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Fixed
+
+- Fixed `omp plugin uninstall <plugin> --dry-run` actually removing the plugin on both the npm and marketplace routes; dry-run now reports what would be removed and leaves installed plugin state unchanged ([#8178](https://github.com/can1357/oh-my-pi/issues/8178)).
+
 ## [17.2.12] - 2026-08-08
 
 ### Fixed
diff --git a/packages/coding-agent/src/cli/plugin-cli.ts b/packages/coding-agent/src/cli/plugin-cli.ts
index 5875345c7..468d8f7e7 100644
--- a/packages/coding-agent/src/cli/plugin-cli.ts
+++ b/packages/coding-agent/src/cli/plugin-cli.ts
@@ -464,7 +464,7 @@ async function handleInstall(
 async function handleUninstall(
 	manager: PluginManager,
 	packages: string[],
-	flags: { json?: boolean; scope?: "user" | "project" },
+	flags: { json?: boolean; dryRun?: boolean; scope?: "user" | "project" },
 ): Promise<void> {
 	if (packages.length === 0) {
 		console.error(chalk.red(`Usage: ${APP_NAME} plugin uninstall <package> ...`));
@@ -477,7 +477,26 @@ async function handleUninstall(
 	const installedPlugins = new Set((await mktMgr.listInstalledPlugins()).map(p => p.id));
 
 	for (const name of packages) {
-		if (installedPlugins.has(name)) {
+		const viaMarketplace = installedPlugins.has(name);
+
+		if (flags.dryRun) {
+			// Dry-run is non-mutating: report the resolved removal without touching state.
+			if (flags.json) {
+				console.log(
+					JSON.stringify({
+						dryRun: true,
+						action: "uninstall",
+						plugin: name,
+						source: viaMarketplace ? "marketplace" : "npm",
+					}),
+				);
+			} else {
+				console.log(chalk.dim(`[dry-run] Would uninstall ${name}`));
+			}
+			continue;
+		}
+
+		if (viaMarketplace) {
 			// Exact match against installed marketplace plugin IDs (name@marketplace)
 			try {
 				await mktMgr.uninstallPlugin(name, flags.scope);
diff --git a/packages/coding-agent/test/plugin-uninstall-dry-run.test.ts b/packages/coding-agent/test/plugin-uninstall-dry-run.test.ts
new file mode 100644
index 000000000..9f03cd3e7
--- /dev/null
+++ b/packages/coding-agent/test/plugin-uninstall-dry-run.test.ts
@@ -0,0 +1,81 @@
+/**
+ * Regression tests for `omp plugin uninstall <plugin> --dry-run` (#8178).
+ *
+ * `--dry-run` must be non-mutating: it reports what would be removed and
+ * leaves the installed plugin list untouched. Before the fix, `handleUninstall`
+ * dropped the parsed `dryRun` flag and unconditionally called the removal
+ * methods, so a dry-run actually uninstalled the plugin on both the npm and
+ * marketplace routes.
+ *
+ * `flags.json` is set so the renderer takes the JSON branch and avoids the
+ * theme (`runPluginCommand` does not initialize the theme on its own).
+ */
+import { afterEach, beforeEach, describe, expect, mock, spyOn, test } from "bun:test";
+import { runPluginCommand } from "@oh-my-pi/pi-coding-agent/cli/plugin-cli";
+import { PluginManager } from "@oh-my-pi/pi-coding-agent/extensibility/plugins/manager";
+import type { InstalledPluginSummary } from "@oh-my-pi/pi-coding-agent/extensibility/plugins/marketplace";
+import { MarketplaceManager } from "@oh-my-pi/pi-coding-agent/extensibility/plugins/marketplace";
+
+describe("runPluginCommand({ action: 'uninstall', flags: { dryRun } })", () => {
+	beforeEach(() => {
+		spyOn(console, "log").mockImplementation(() => undefined);
+		spyOn(console, "error").mockImplementation(() => undefined);
+	});
+	afterEach(() => {
+		mock.restore();
+	});
+
+	test("npm route: --dry-run never calls PluginManager.uninstall", async () => {
+		// No marketplace-installed plugins → the name routes down the npm path.
+		spyOn(MarketplaceManager.prototype, "listInstalledPlugins").mockResolvedValue([]);
+		const npmUninstall = spyOn(PluginManager.prototype, "uninstall").mockResolvedValue(undefined);
+		const mktUninstall = spyOn(MarketplaceManager.prototype, "uninstallPlugin").mockResolvedValue(undefined);
+		try {
+			await runPluginCommand({ action: "uninstall", args: ["zmarketplace"], flags: { dryRun: true, json: true } });
+			expect(npmUninstall).not.toHaveBeenCalled();
+			expect(mktUninstall).not.toHaveBeenCalled();
+		} finally {
+			npmUninstall.mockRestore();
+			mktUninstall.mockRestore();
+		}
+	});
+
+	test("marketplace route: --dry-run never calls MarketplaceManager.uninstallPlugin", async () => {
+		const installed: InstalledPluginSummary = {
+			id: "hello@local",
+			scope: "user",
+			entries: [
+				{
+					scope: "user",
+					installPath: "/tmp/hello",
+					version: "1.0.0",
+					installedAt: new Date().toISOString(),
+					lastUpdated: new Date().toISOString(),
+				},
+			],
+		};
+		spyOn(MarketplaceManager.prototype, "listInstalledPlugins").mockResolvedValue([installed]);
+		const npmUninstall = spyOn(PluginManager.prototype, "uninstall").mockResolvedValue(undefined);
+		const mktUninstall = spyOn(MarketplaceManager.prototype, "uninstallPlugin").mockResolvedValue(undefined);
+		try {
+			await runPluginCommand({ action: "uninstall", args: ["hello@local"], flags: { dryRun: true, json: true } });
+			expect(mktUninstall).not.toHaveBeenCalled();
+			expect(npmUninstall).not.toHaveBeenCalled();
+		} finally {
+			npmUninstall.mockRestore();
+			mktUninstall.mockRestore();
+		}
+	});
+
+	test("without --dry-run the npm route still uninstalls", async () => {
+		spyOn(MarketplaceManager.prototype, "listInstalledPlugins").mockResolvedValue([]);
+		const npmUninstall = spyOn(PluginManager.prototype, "uninstall").mockResolvedValue(undefined);
+		try {
+			await runPluginCommand({ action: "uninstall", args: ["zmarketplace"], flags: { json: true } });
+			expect(npmUninstall).toHaveBeenCalledTimes(1);
+			expect(npmUninstall.mock.calls[0]?.[0]).toBe("zmarketplace");
+		} finally {
+			npmUninstall.mockRestore();
+		}
+	});
+});