diff --git a/package.json b/package.json
index 3893c71..9ace844 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hasna/contracts",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Shared schemas and validators for Hasna open-source agent infrastructure contracts.",
   "type": "module",
   "license": "Apache-2.0",
diff --git a/src/client/transport.test.ts b/src/client/transport.test.ts
index 82f02c8..9a49536 100644
--- a/src/client/transport.test.ts
+++ b/src/client/transport.test.ts
@@ -41,6 +41,27 @@ describe("resolveClientTransport — the client-flip contract", () => {
     expect(JSON.stringify(r)).not.toContain("hasna_todos_abc");
   });
 
+  test("FLIP: url+key with NO mode env => inferred cloud-http (fleet-flip contract)", () => {
+    const r = resolveClientTransport("todos", {
+      HASNA_TODOS_API_URL: "https://todos.hasna.xyz",
+      HASNA_TODOS_API_KEY: "hasna_todos_flip",
+    });
+    expect(r.transport).toBe("cloud-http");
+    expect(r.mode).toBe("cloud");
+    expect(r.baseUrl).toBe("https://todos.hasna.xyz/v1");
+    expect(r.modeSource).toBe("HASNA_TODOS_API_URL+HASNA_TODOS_API_KEY");
+    expect(JSON.stringify(r)).not.toContain("hasna_todos_flip");
+  });
+
+  test("FLIP revert: url present but key removed => back to local (not misconfigured)", () => {
+    const r = resolveClientTransport("todos", {
+      HASNA_TODOS_API_URL: "https://todos.hasna.xyz",
+    });
+    expect(r.transport).toBe("local");
+    expect(r.mode).toBe("local");
+    expect(r.misconfigured).toBe(false);
+  });
+
   test("self_hosted alias normalizes to cloud and defaults the host", () => {
     const r = resolveClientTransport("knowledge", {
       HASNA_KNOWLEDGE_MODE: "self_hosted",
diff --git a/src/client/transport.ts b/src/client/transport.ts
index aa32830..ac80185 100644
--- a/src/client/transport.ts
+++ b/src/client/transport.ts
@@ -25,10 +25,14 @@
 //     <NAME>_API_KEY                                                  (alias)
 //
 // DECISION: transport is `cloud-http` IFF the resolved mode is `cloud` AND an API
-// key is present. The base URL defaults to `https://<app>.hasna.xyz` when a key is
-// present but no URL is set. If mode is `cloud` but the API key is MISSING, we do
-// NOT silently serve wrong local data — we return `local` with a loud `warning`
-// and `misconfigured: true` so the caller can hard-fail instead of drifting.
+// key is present. The mode is `cloud` when either (a) an explicit mode env resolves
+// to cloud, OR (b) no mode env is set but BOTH the API URL and API key are present —
+// the fleet env-flip writes exactly those two vars (no STORAGE_MODE), so their joint
+// presence is inferred as self_hosted intent. The base URL defaults to
+// `https://<app>.hasna.xyz` when a key is present but no URL is set. If mode is
+// `cloud` but the API key is MISSING, we do NOT silently serve wrong local data — we
+// return `local` with a loud `warning` and `misconfigured: true` so the caller can
+// hard-fail instead of drifting.
 //
 // SAFETY: this module never returns, logs, or embeds the API key value. Callers
 // receive only presence flags and env-key names.
@@ -143,6 +147,14 @@ export function resolveClientTransport(name: string, env: Env = process.env): Cl
         `Deprecated mode '${deprecatedAlias}' from ${modeHit.key} is treated as 'cloud'. Prefer ${keys.modeKeys[0]}=cloud.`,
       );
     }
+  } else if (urlHit && keyHit) {
+    // Flip signal: the fleet env-flip writes EXACTLY HASNA_<APP>_API_URL +
+    // HASNA_<APP>_API_KEY per app and NO explicit STORAGE_MODE (see machines
+    // FLEET-FLIP.md). Their joint presence IS the self_hosted intent, so infer
+    // `cloud`. Revert removes both vars, so the client falls back to local. Without
+    // this, a flipped client with only url+key silently kept reading its local store.
+    mode = "cloud";
+    modeSource = `${urlHit.key}+${keyHit.key}`;
   }
 
   // Local mode: never route to the network, regardless of URL/key presence.
diff --git a/src/schemas.ts b/src/schemas.ts
index 2b0a493..6c29d0b 100644
--- a/src/schemas.ts
+++ b/src/schemas.ts
@@ -1,7 +1,7 @@
 import { z } from "zod";
 
 export const CONTRACTS_PACKAGE_NAME = "@hasna/contracts";
-export const CONTRACTS_PACKAGE_VERSION = "0.5.0";
+export const CONTRACTS_PACKAGE_VERSION = "0.5.1";
 
 export const SCHEMA_IDS = {
   actorRef: "hasna.actor_ref.v1",