diff --git a/apps/server/src/services/sessions/playbook-session-adapter/runtime.test.ts b/apps/server/src/services/sessions/playbook-session-adapter/runtime.test.ts
index 19d9b68..11c2b06 100644
--- a/apps/server/src/services/sessions/playbook-session-adapter/runtime.test.ts
+++ b/apps/server/src/services/sessions/playbook-session-adapter/runtime.test.ts
@@ -6,6 +6,7 @@ import {
 	PlaybookAgentIdentityMismatchError,
 	pickPlaybookAgent,
 	type RemotePlaybookAgent,
+	readinessFromPick,
 } from "./runtime";
 import type { PlaybookSessionDetail } from "./sessions";
 
@@ -77,6 +78,28 @@ describe("pickPlaybookAgent", () => {
 	});
 });
 
+describe("readinessFromPick", () => {
+	test("maps agent picks to playbook readiness states", () => {
+		expect(readinessFromPick({ agent: agent(), duplicates: [], identityMismatch: false }, "designer")).toEqual({
+			status: "ready",
+			playbookId: "designer",
+			remoteAgentId: "agent_1",
+		});
+
+		expect(readinessFromPick({ agent: undefined, duplicates: [], identityMismatch: false }, "designer")).toEqual({
+			status: "missing",
+			playbookId: "designer",
+			reason: "not_provisioned",
+		});
+
+		expect(readinessFromPick({ agent: undefined, duplicates: [], identityMismatch: true }, "designer")).toMatchObject({
+			status: "blocked",
+			playbookId: "designer",
+			reason: "identity_mismatch",
+		});
+	});
+});
+
 describe("createPlaybookSessionRuntime", () => {
 	test("start ensures the selected agent, starts the provider session, attaches events, then returns detail", async () => {
 		const calls: string[] = [];
diff --git a/apps/server/src/services/sessions/playbook-session-adapter/runtime.ts b/apps/server/src/services/sessions/playbook-session-adapter/runtime.ts
index cc5796f..06fad7c 100644
--- a/apps/server/src/services/sessions/playbook-session-adapter/runtime.ts
+++ b/apps/server/src/services/sessions/playbook-session-adapter/runtime.ts
@@ -94,6 +94,12 @@ export type PlaybookAgentPick = {
 	identityMismatch: boolean;
 };
 
+export type PlaybookReadiness =
+	| { status: "ready"; playbookId: string; remoteAgentId: string }
+	| { status: "missing"; playbookId: string; reason: "not_provisioned" }
+	| { status: "unknown"; playbookId: string; reason: "not_checked" | "check_failed" }
+	| { status: "blocked"; playbookId: string; reason: "identity_mismatch"; message: string };
+
 // ---------------------------------------------------------------------------
 // Identity-mismatch error
 // ---------------------------------------------------------------------------
@@ -135,6 +141,21 @@ export function pickPlaybookAgent(
 	return { agent, duplicates, identityMismatch: false };
 }
 
+// The single source of the pick-to-readiness mapping, so identity-drift
+// handling lives in one place.
+export function readinessFromPick(pick: PlaybookAgentPick, playbookId: string): PlaybookReadiness {
+	if (pick.identityMismatch) {
+		return {
+			status: "blocked",
+			playbookId,
+			reason: "identity_mismatch",
+			message: playbookIdentityMismatchMessage(playbookId),
+		};
+	}
+	if (!pick.agent) return { status: "missing", playbookId, reason: "not_provisioned" };
+	return { status: "ready", playbookId, remoteAgentId: pick.agent.id };
+}
+
 // ---------------------------------------------------------------------------
 // Dependency contract (concrete types, no generics)
 // ---------------------------------------------------------------------------