diff --git a/docs/settings.md b/docs/settings.md
index d604d75fa..e3ef950de 100644
--- a/docs/settings.md
+++ b/docs/settings.md
@@ -88,7 +88,7 @@ built-in defaults  <-  global config  <-  project config  <-  CLI overlays  <-
 
 From highest to lowest:
 
-1. **Runtime overrides** — dedicated CLI flags and feature env vars applied in memory for the current process: `--model`, `--smol`, `--slow`, `--plan`, `--approval-mode`, `--auto-approve`/`--yolo`, `--hide-thinking`, `--no-pty`, `--api-key`, and protocol-mode defaults. Never persisted.
+1. **Runtime overrides** — dedicated CLI flags and feature env vars applied in memory for the current process: `--model`, `--smol`, `--slow`, `--plan`, `--approval-mode`, `--auto-approve`/`--yolo`, `--hide-thinking`, `--advisor`, `--no-pty`, `--api-key`, and protocol-mode defaults. Never persisted.
 2. **CLI config overlays** — each `--config <file>`; later overlay files override earlier ones.
 3. **Project settings** — `<cwd>/.omp/settings.json` then `<cwd>/.omp/config.yml` (and contributions from other discovery providers at project level).
 4. **Global settings** — `~/.omp/agent/config.yml`.
@@ -312,7 +312,7 @@ See [Models](./models.md) for the `models.yml` schema and custom-provider defini
 
 ### Advisor
 
-The advisor is a second model that reviews each completed turn and can inject advice into the primary session. Assign a model with `modelRoles.advisor`, then enable it with `advisor.enabled` or `/advisor on`. There is no `--advisor` flag.
+The advisor is a second model that reviews each completed turn and can inject advice into the primary session. Assign a model with `modelRoles.advisor`, then enable it with `advisor.enabled`, `/advisor on`, or by launching with the `--advisor` flag.
 
 See [Advisor and WATCHDOG.md](./advisor-watchdog.md) for runtime behavior, `WATCHDOG.md` discovery, and bounded catch-up semantics.
 
diff --git a/packages/coding-agent/src/cli/args.ts b/packages/coding-agent/src/cli/args.ts
index fe0ca8b71..4557959d0 100644
--- a/packages/coding-agent/src/cli/args.ts
+++ b/packages/coding-agent/src/cli/args.ts
@@ -33,6 +33,7 @@ export interface Args {
 	appendSystemPrompt?: string;
 	thinking?: Effort;
 	hideThinking?: boolean;
+	advisor?: boolean;
 	continue?: boolean;
 	resume?: string | true;
 	help?: boolean;
@@ -194,6 +195,8 @@ export function parseArgs(inputArgs: string[], extensionFlags?: Map<string, { ty
 			result.noPty = true;
 		} else if (arg === "--hide-thinking") {
 			result.hideThinking = true;
+		} else if (arg === "--advisor") {
+			result.advisor = true;
 		} else if (arg === "--print" || arg === "-p") {
 			result.print = true;
 		} else if (arg === "--no-extensions") {
diff --git a/packages/coding-agent/src/cli/flag-tables.ts b/packages/coding-agent/src/cli/flag-tables.ts
index 4e2354e12..8cc9b3d22 100644
--- a/packages/coding-agent/src/cli/flag-tables.ts
+++ b/packages/coding-agent/src/cli/flag-tables.ts
@@ -260,6 +260,7 @@ export const VALUELESS_FLAGS: ReadonlySet<string> = new Set([
 	"--no-lsp",
 	"--no-pty",
 	"--hide-thinking",
+	"--advisor",
 	"--print",
 	"--no-extensions",
 	"--no-skills",
diff --git a/packages/coding-agent/src/commands/launch.ts b/packages/coding-agent/src/commands/launch.ts
index b18c4efc8..a2c40d8a1 100644
--- a/packages/coding-agent/src/commands/launch.ts
+++ b/packages/coding-agent/src/commands/launch.ts
@@ -106,6 +106,9 @@ export default class Index extends Command {
 		"hide-thinking": Flags.boolean({
 			description: "Hide thinking blocks in TUI output (display only, does not disable model thinking)",
 		}),
+		advisor: Flags.boolean({
+			description: "Enable the advisor runtime (passively reviews each turn and injects notes)",
+		}),
 		hook: Flags.string({
 			description: "Load a hook/extension file (can be used multiple times)",
 			multiple: true,
diff --git a/packages/coding-agent/src/main.ts b/packages/coding-agent/src/main.ts
index b730a9b46..4cf6faf6e 100644
--- a/packages/coding-agent/src/main.ts
+++ b/packages/coding-agent/src/main.ts
@@ -1041,6 +1041,10 @@ export async function runRootCommand(
 	if (parsedArgs.hideThinking) {
 		settingsInstance.override("hideThinkingBlock", true);
 	}
+	// Apply --advisor CLI flag (ephemeral, not persisted)
+	if (parsedArgs.advisor) {
+		settingsInstance.override("advisor.enabled", true);
+	}
 
 	await logger.time(
 		"initTheme:final",
diff --git a/packages/coding-agent/test/cli-advisor-flag.test.ts b/packages/coding-agent/test/cli-advisor-flag.test.ts
new file mode 100644
index 000000000..8e516fd96
--- /dev/null
+++ b/packages/coding-agent/test/cli-advisor-flag.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from "bun:test";
+import { parseArgs } from "@oh-my-pi/pi-coding-agent/cli/args";
+
+describe("parseArgs — --advisor flag", () => {
+	it("parses --advisor as a boolean flag", () => {
+		const result = parseArgs(["--advisor"]);
+		expect(result.advisor).toBe(true);
+	});
+
+	it("defaults advisor to undefined when flag is not provided", () => {
+		const result = parseArgs([]);
+		expect(result.advisor).toBeUndefined();
+	});
+
+	it("parses --advisor with other flags", () => {
+		const result = parseArgs(["--advisor", "--model", "opus", "hello"]);
+		expect(result.advisor).toBe(true);
+		expect(result.model).toBe("opus");
+		expect(result.messages).toContain("hello");
+	});
+
+	it("parses --advisor in any position", () => {
+		const result1 = parseArgs(["--advisor", "prompt"]);
+		const result2 = parseArgs(["prompt", "--advisor"]);
+		const result3 = parseArgs(["--model", "opus", "--advisor", "prompt"]);
+
+		expect(result1.advisor).toBe(true);
+		expect(result2.advisor).toBe(true);
+		expect(result3.advisor).toBe(true);
+	});
+
+	it("does not consume a value after --advisor", () => {
+		const result = parseArgs(["--advisor", "--model", "opus"]);
+		expect(result.advisor).toBe(true);
+		expect(result.model).toBe("opus");
+		expect(result.messages).toEqual([]);
+	});
+});