diff --git a/docs/plugins/sdk-entrypoints.md b/docs/plugins/sdk-entrypoints.md
index 8345c4957a7e..a15081841350 100644
--- a/docs/plugins/sdk-entrypoints.md
+++ b/docs/plugins/sdk-entrypoints.md
@@ -155,6 +155,38 @@ export default definePluginEntry({
   `onHost(host)` callback as each host settles; the returned host array remains
   required as the final compatibility snapshot.
 
+  A provider may declare one readable transcript route with `shareRoute`. This
+  is a closed contract, not a free-form routing hint:
+
+  ```ts
+  const shareRoute = {
+    kind: "thread-id-prefix",
+    routeSegment: "my-sessions",
+    hostId: "gateway",
+    identifierAlphabet: "lowercase-hex",
+    fullLength: 32,
+    minPrefixLength: 12,
+    lookup: "catalog-list-search-by-thread-id-prefix",
+    ambiguity: "multiple-results-or-next-cursor",
+  } as const;
+  ```
+
+  The provider must return lowercase hexadecimal `threadId` values of exactly
+  32 characters on the declared host. When `list(...)` receives a `search`
+  value that is a valid 12-32 character prefix, that host must return only rows
+  whose `threadId` starts with the prefix. Return every match up to the requested
+  limit and set `nextCursor` when more may exist. The Control UI resolves only
+  one result with no next page; multiple rows or `nextCursor` are explicitly
+  ambiguous and never select the first row.
+
+  `routeSegment` must not use the first segment of a built-in Control UI route
+  or alias, and it must be unique across active session catalogs. Invalid,
+  unsupported, reserved, or multiply owned descriptors fail closed; catalog
+  sessions remain available through the generic
+  `/chat/<agent>?catalog=...&host=...&thread=...` URL. Keep one plugin-owned
+  descriptor constant and reuse it for registration, prefix lookup, and URL
+  generation so those obligations cannot drift.
+
   CLI-backed catalogs that expose the same local-plus-paired-node shape can use
   `createSessionCatalogFamily(...)`. The family composer owns canonical cursor
   validation, node payload validation, host projection, adopted-session
diff --git a/extensions/beam/src/http.ts b/extensions/beam/src/http.ts
index 91334bbd6e3c..259fec216ec3 100644
--- a/extensions/beam/src/http.ts
+++ b/extensions/beam/src/http.ts
@@ -8,7 +8,7 @@ import {
   readJsonWebhookBodyOrReject,
 } from "openclaw/plugin-sdk/webhook-ingress";
 import type { BeamStore } from "./store.js";
-import { BEAM_MAX_BODY_BYTES, BEAM_ROUTE_SEGMENT, parseBeamUpload } from "./types.js";
+import { BEAM_MAX_BODY_BYTES, BEAM_SESSION_SHARE_ROUTE, parseBeamUpload } from "./types.js";
 
 function sendJson(res: ServerResponse, status: number, value: unknown): void {
   res.statusCode = status;
@@ -108,7 +108,7 @@ export function createBeamRequestHandler(params: {
         ok: true,
         beamId: parsed.value.beamId,
         url: buildControlUiCatalogSharePath({
-          routeSegment: BEAM_ROUTE_SEGMENT,
+          shareRoute: BEAM_SESSION_SHARE_ROUTE,
           threadId: parsed.value.beamId,
           basePath: params.resolveControlUiBasePath(),
         }),
diff --git a/extensions/beam/src/session-catalog.ts b/extensions/beam/src/session-catalog.ts
index 721f7deab252..a9ee15976290 100644
--- a/extensions/beam/src/session-catalog.ts
+++ b/extensions/beam/src/session-catalog.ts
@@ -5,7 +5,7 @@ import type {
 } from "openclaw/plugin-sdk/session-catalog";
 import { isControlUiCatalogShareId } from "openclaw/plugin-sdk/session-catalog-runtime";
 import type { BeamStore } from "./store.js";
-import { BEAM_HOST_ID, BEAM_ROUTE_SEGMENT, type BeamStoredSession } from "./types.js";
+import { BEAM_HOST_ID, BEAM_SESSION_SHARE_ROUTE, type BeamStoredSession } from "./types.js";
 
 const DEFAULT_LIMIT = 50;
 const MAX_LIMIT = 100;
@@ -87,11 +87,12 @@ export function createBeamSessionCatalog(store: BeamStore): SessionCatalogProvid
   return {
     id: "beam",
     label: "Beam",
-    shareRoute: { routeSegment: BEAM_ROUTE_SEGMENT, hostId: BEAM_HOST_ID },
+    shareRoute: BEAM_SESSION_SHARE_ROUTE,
     supportsProcessHomeIsolation: true,
     async list(params) {
       const search = params.search?.trim().toLowerCase();
-      const shareId = search && isControlUiCatalogShareId(search) ? search : undefined;
+      const shareId =
+        search && isControlUiCatalogShareId(BEAM_SESSION_SHARE_ROUTE, search) ? search : undefined;
       const sessions = (await store.list())
         .filter(
           (session) =>
diff --git a/extensions/beam/src/types.ts b/extensions/beam/src/types.ts
index 3f4fef5d437a..686c4c05f3ae 100644
--- a/extensions/beam/src/types.ts
+++ b/extensions/beam/src/types.ts
@@ -1,10 +1,20 @@
+import type { SessionCatalogProvider } from "openclaw/plugin-sdk/session-catalog";
 import {
   isRecord,
   normalizeBoundedOptionalString as readBoundedString,
 } from "openclaw/plugin-sdk/string-coerce-runtime";
 
 export const BEAM_HOST_ID = "gateway";
-export const BEAM_ROUTE_SEGMENT = "beam";
+export const BEAM_SESSION_SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "beam",
+  hostId: BEAM_HOST_ID,
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const satisfies NonNullable<SessionCatalogProvider["shareRoute"]>;
 export const BEAM_MAX_BODY_BYTES = 56 * 1024;
 export const BEAM_RETENTION_MS = 7 * 24 * 60 * 60 * 1000;
 export const BEAM_MAX_SESSIONS = 500;
diff --git a/packages/gateway-protocol/src/public-session-catalog.ts b/packages/gateway-protocol/src/public-session-catalog.ts
index 84820058fede..4fc1fcffe9e7 100644
--- a/packages/gateway-protocol/src/public-session-catalog.ts
+++ b/packages/gateway-protocol/src/public-session-catalog.ts
@@ -7,6 +7,7 @@ export type {
   SessionCatalogLocator,
   SessionCatalogPullRequestSummary,
   SessionCatalogSession,
+  SessionCatalogShareRoute,
   SessionCatalogTranscriptItem,
   SessionsCatalogArchiveParams,
   SessionsCatalogArchiveResult,
diff --git a/packages/gateway-protocol/src/schema/sessions-catalog.test.ts b/packages/gateway-protocol/src/schema/sessions-catalog.test.ts
index 7c806a51eb1b..645d5ff7c4b7 100644
--- a/packages/gateway-protocol/src/schema/sessions-catalog.test.ts
+++ b/packages/gateway-protocol/src/schema/sessions-catalog.test.ts
@@ -1,6 +1,7 @@
 import { Value } from "typebox/value";
 import { describe, expect, it } from "vitest";
 import {
+  SessionCatalogShareRouteSchema,
   SessionsCatalogHostEventSchema,
   SessionsCatalogListParamsSchema,
   SessionsCatalogListResultSchema,
@@ -8,6 +9,34 @@ import {
   SessionsCatalogStartTerminalResultSchema,
 } from "./sessions-catalog.js";
 
+const SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "shared-sessions",
+  hostId: "gateway",
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const;
+
+describe("SessionCatalogShareRouteSchema", () => {
+  it("accepts only the closed prefix-search contract", () => {
+    expect(Value.Check(SessionCatalogShareRouteSchema, SHARE_ROUTE)).toBe(true);
+    for (const invalid of [
+      { ...SHARE_ROUTE, kind: "future-route" },
+      { ...SHARE_ROUTE, identifierAlphabet: "hex" },
+      { ...SHARE_ROUTE, fullLength: 64 },
+      { ...SHARE_ROUTE, minPrefixLength: 8 },
+      { ...SHARE_ROUTE, lookup: "arbitrary-search" },
+      { ...SHARE_ROUTE, ambiguity: "first-result" },
+      { ...SHARE_ROUTE, unexpected: true },
+    ]) {
+      expect(Value.Check(SessionCatalogShareRouteSchema, invalid)).toBe(false);
+    }
+  });
+});
+
 describe("SessionsCatalogListResultSchema", () => {
   it("accepts a closed catalog result with hosts", () => {
     expect(
@@ -25,6 +54,7 @@ describe("SessionsCatalogListResultSchema", () => {
               },
               openTerminal: true,
             },
+            shareRoute: SHARE_ROUTE,
             hosts: [
               {
                 hostId: "gateway:local",
diff --git a/packages/gateway-protocol/src/schema/sessions-catalog.ts b/packages/gateway-protocol/src/schema/sessions-catalog.ts
index 1df9951c23ff..e98236292aeb 100644
--- a/packages/gateway-protocol/src/schema/sessions-catalog.ts
+++ b/packages/gateway-protocol/src/schema/sessions-catalog.ts
@@ -28,8 +28,14 @@ export const SessionCatalogCapabilitiesSchema = closedObject({
 });
 
 export const SessionCatalogShareRouteSchema = closedObject({
+  kind: Type.Literal("thread-id-prefix"),
   routeSegment: Type.String({ pattern: "^[a-z][a-z0-9-]*$" }),
   hostId: NonEmptyString,
+  identifierAlphabet: Type.Literal("lowercase-hex"),
+  fullLength: Type.Literal(32),
+  minPrefixLength: Type.Literal(12),
+  lookup: Type.Literal("catalog-list-search-by-thread-id-prefix"),
+  ambiguity: Type.Literal("multiple-results-or-next-cursor"),
 });
 
 export const SessionCatalogDescriptorSchema = closedObject({
diff --git a/packages/gateway-protocol/src/validator-registry.ts b/packages/gateway-protocol/src/validator-registry.ts
index 15c3888ba0ac..81c8dee87f4a 100644
--- a/packages/gateway-protocol/src/validator-registry.ts
+++ b/packages/gateway-protocol/src/validator-registry.ts
@@ -200,6 +200,7 @@ export const validateSecretsStoreSetParams = compile(S.SecretsStoreSetParamsSche
 export const validateSecretsStoreDeleteParams = compile(S.SecretsStoreDeleteParamsSchema);
 export const validateSecretsStoreMutationResult = compile(S.SecretsStoreMutationResultSchema);
 export const validateSessionsListParams = compile(S.SessionsListParamsSchema);
+export const validateSessionCatalogShareRoute = compile(S.SessionCatalogShareRouteSchema);
 export const validateSessionsCatalogListParams = compile(S.SessionsCatalogListParamsSchema);
 export const validateSessionsCatalogReadParams = compile(S.SessionsCatalogReadParamsSchema);
 export const validateSessionsCatalogContinueParams = compile(S.SessionsCatalogContinueParamsSchema);
diff --git a/packages/session-url-contract/src/index.test.ts b/packages/session-url-contract/src/index.test.ts
index 55136bbeb04d..4a731fcf5848 100644
--- a/packages/session-url-contract/src/index.test.ts
+++ b/packages/session-url-contract/src/index.test.ts
@@ -6,6 +6,17 @@ import {
   controlUiSessionSlug,
 } from "./index.js";
 
+const SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "beam",
+  hostId: "gateway",
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const;
+
 type ChatParams = Omit<Parameters<typeof buildControlUiSessionPath>[0], "namespace">;
 
 const UUID_KEY = "agent:main:dashboard:12345678-90ab-cdef-1234-567890abcdef";
@@ -85,8 +96,8 @@ describe("buildControlUiCatalogSharePath", () => {
   ])("builds a lowercase 12-character share id for $label", ({ basePath, expected }) => {
     expect(
       buildControlUiCatalogSharePath({
-        routeSegment: "beam",
-        threadId: "0123456789ABCDEF0123456789ABCDEF",
+        shareRoute: SHARE_ROUTE,
+        threadId: "0123456789abcdef0123456789abcdef",
         basePath,
       }),
     ).toBe(expected);
@@ -95,20 +106,27 @@ describe("buildControlUiCatalogSharePath", () => {
   it("can retain the full id for an unambiguous fallback", () => {
     expect(
       buildControlUiCatalogSharePath({
-        routeSegment: "beam",
+        shareRoute: SHARE_ROUTE,
         threadId: "0123456789abcdef0123456789abcdef",
-        shortIdLength: 32,
+        prefixLength: SHARE_ROUTE.fullLength,
       }),
     ).toBe("/beam/0123456789abcdef0123456789abcdef");
   });
 
   it.each([
-    { routeSegment: "Beam", threadId: "0123456789abcdef0123456789abcdef" },
-    { routeSegment: "beam/extra", threadId: "0123456789abcdef0123456789abcdef" },
-    { routeSegment: "beam", threadId: "0123456789ab" },
-    { routeSegment: "beam", threadId: "not-hex" },
-  ])("rejects invalid catalog share input %#", (params) => {
-    expect(buildControlUiCatalogSharePath(params)).toBeNull();
+    {
+      shareRoute: { ...SHARE_ROUTE, routeSegment: "Beam" },
+      threadId: "0123456789abcdef0123456789abcdef",
+    },
+    {
+      shareRoute: { ...SHARE_ROUTE, routeSegment: "beam/extra" },
+      threadId: "0123456789abcdef0123456789abcdef",
+    },
+    { shareRoute: SHARE_ROUTE, threadId: "0123456789ab" },
+    { shareRoute: SHARE_ROUTE, threadId: "0123456789ABCDEF0123456789ABCDEF" },
+    { shareRoute: SHARE_ROUTE, threadId: "not-hex" },
+  ])("rejects invalid catalog share input %#", ({ shareRoute, threadId }) => {
+    expect(buildControlUiCatalogSharePath({ shareRoute, threadId })).toBeNull();
   });
 });
 
diff --git a/packages/session-url-contract/src/index.ts b/packages/session-url-contract/src/index.ts
index 311fe3f8617f..d810f1598517 100644
--- a/packages/session-url-contract/src/index.ts
+++ b/packages/session-url-contract/src/index.ts
@@ -11,11 +11,10 @@ export { normalizeControlUiBasePath };
 export * from "./focus.js";
 export {
   buildControlUiCatalogSharePath,
-  CONTROL_UI_CATALOG_SHARE_FULL_ID_LENGTH,
-  CONTROL_UI_CATALOG_SHARE_SHORT_ID_LENGTH,
   isControlUiCatalogShareId,
   isControlUiCatalogShareRouteSegment,
   matchControlUiCatalogSharePath,
+  type ControlUiCatalogShareRoute,
   type ControlUiCatalogSharePathMatch,
 } from "./share.js";
 
diff --git a/packages/session-url-contract/src/parse.test.ts b/packages/session-url-contract/src/parse.test.ts
index e507c7061c4a..825f71ba88a3 100644
--- a/packages/session-url-contract/src/parse.test.ts
+++ b/packages/session-url-contract/src/parse.test.ts
@@ -300,7 +300,6 @@ describe("matchControlUiCatalogSharePath", () => {
     expect(matchControlUiCatalogSharePath({ pathname, basePath })).toEqual({
       routeSegment: "beam",
       shortId,
-      valid: true,
     });
   });
 
@@ -310,11 +309,10 @@ describe("matchControlUiCatalogSharePath", () => {
     "/beam/0123456789abcdef0123456789abcdef0",
     "/beam/not-hex-value",
     "/beam/0123456789ab/extra",
-  ])("classifies strict invalid form %s", (pathname) => {
+  ])("parses the route owner before descriptor validation for %s", (pathname) => {
     expect(matchControlUiCatalogSharePath({ pathname })).toEqual({
       routeSegment: "beam",
       shortId: pathname.slice("/beam/".length),
-      valid: false,
     });
   });
 
diff --git a/packages/session-url-contract/src/share.ts b/packages/session-url-contract/src/share.ts
index cf04d1817ff3..194a3e084b59 100644
--- a/packages/session-url-contract/src/share.ts
+++ b/packages/session-url-contract/src/share.ts
@@ -1,21 +1,34 @@
 import { normalizeNullableString } from "@openclaw/normalization-core/string-coerce";
 import { normalizeControlUiBasePath } from "./grammar.js";
 
-export const CONTROL_UI_CATALOG_SHARE_SHORT_ID_LENGTH = 12;
-export const CONTROL_UI_CATALOG_SHARE_FULL_ID_LENGTH = 32;
-
-const CATALOG_SHARE_ID_RE = /^[0-9a-f]{12,32}$/u;
-const CATALOG_SHARE_THREAD_ID_RE = /^[0-9a-f]{32}$/iu;
+const LOWERCASE_HEX_RE = /^[0-9a-f]+$/u;
 const CATALOG_SHARE_ROUTE_SEGMENT_RE = /^[a-z][a-z0-9-]*$/u;
 
+export type ControlUiCatalogShareRoute = {
+  kind: "thread-id-prefix";
+  routeSegment: string;
+  hostId: string;
+  identifierAlphabet: "lowercase-hex";
+  fullLength: 32;
+  minPrefixLength: 12;
+  lookup: "catalog-list-search-by-thread-id-prefix";
+  ambiguity: "multiple-results-or-next-cursor";
+};
+
 export type ControlUiCatalogSharePathMatch = {
   routeSegment: string;
   shortId: string;
-  valid: boolean;
 };
 
-export function isControlUiCatalogShareId(value: string): boolean {
-  return CATALOG_SHARE_ID_RE.test(value);
+export function isControlUiCatalogShareId(
+  shareRoute: ControlUiCatalogShareRoute,
+  value: string,
+): boolean {
+  return (
+    value.length >= shareRoute.minPrefixLength &&
+    value.length <= shareRoute.fullLength &&
+    LOWERCASE_HEX_RE.test(value)
+  );
 }
 
 export function isControlUiCatalogShareRouteSegment(value: string): boolean {
@@ -43,30 +56,31 @@ export function matchControlUiCatalogSharePath(params: {
   return {
     routeSegment,
     shortId,
-    valid: idSegments.length === 1 && isControlUiCatalogShareId(shortId),
   };
 }
 
 export function buildControlUiCatalogSharePath(params: {
-  routeSegment: string;
+  shareRoute: ControlUiCatalogShareRoute;
   threadId: string;
   basePath?: string;
-  shortIdLength?: number;
+  prefixLength?: number;
 }): string | null {
   const threadId = normalizeNullableString(params.threadId);
+  const shareRoute = params.shareRoute;
   if (
     !threadId ||
-    !isControlUiCatalogShareRouteSegment(params.routeSegment) ||
-    !CATALOG_SHARE_THREAD_ID_RE.test(threadId)
+    !isControlUiCatalogShareRouteSegment(shareRoute.routeSegment) ||
+    threadId.length !== shareRoute.fullLength ||
+    !LOWERCASE_HEX_RE.test(threadId)
   ) {
     return null;
   }
   const length = Math.min(
-    CONTROL_UI_CATALOG_SHARE_FULL_ID_LENGTH,
+    shareRoute.fullLength,
     Math.max(
-      CONTROL_UI_CATALOG_SHARE_SHORT_ID_LENGTH,
-      Math.floor(params.shortIdLength ?? CONTROL_UI_CATALOG_SHARE_SHORT_ID_LENGTH),
+      shareRoute.minPrefixLength,
+      Math.floor(params.prefixLength ?? shareRoute.minPrefixLength),
     ),
   );
-  return `${normalizeControlUiBasePath(params.basePath)}/${params.routeSegment}/${threadId.toLowerCase().slice(0, length)}`;
+  return `${normalizeControlUiBasePath(params.basePath)}/${shareRoute.routeSegment}/${threadId.slice(0, length)}`;
 }
diff --git a/src/gateway/server-methods/session-catalog-share-route.test-support.ts b/src/gateway/server-methods/session-catalog-share-route.test-support.ts
new file mode 100644
index 000000000000..806b15d7867a
--- /dev/null
+++ b/src/gateway/server-methods/session-catalog-share-route.test-support.ts
@@ -0,0 +1,12 @@
+import type { SessionCatalogProvider } from "../../plugins/session-catalog.js";
+
+export const TEST_SESSION_CATALOG_SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "shared-sessions",
+  hostId: "gateway",
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const satisfies NonNullable<SessionCatalogProvider["shareRoute"]>;
diff --git a/src/gateway/server-methods/session-catalog.test.ts b/src/gateway/server-methods/session-catalog.test.ts
index 4840a8bab839..e1c453e203ea 100644
--- a/src/gateway/server-methods/session-catalog.test.ts
+++ b/src/gateway/server-methods/session-catalog.test.ts
@@ -5,6 +5,7 @@ import { bindPluginRegistryRuntime } from "../../plugins/registry-runtime-bindin
 import type { PluginRegistry } from "../../plugins/registry-types.js";
 import { createPluginRuntime } from "../../plugins/runtime/index.js";
 import type { SessionCatalogProvider } from "../../plugins/session-catalog.js";
+import { TEST_SESSION_CATALOG_SHARE_ROUTE as SHARE_ROUTE } from "./session-catalog-share-route.test-support.js";
 
 type TestPluginRegistry = Omit<PluginRegistry, "sessionCatalogs"> & {
   sessionCatalogs: Array<{
@@ -142,25 +143,25 @@ describe("session catalog Gateway methods", () => {
     });
   });
 
-  it("projects plugin-owned share routes with catalog results", async () => {
-    hoisted.activeRegistry.sessionCatalogs = [
-      {
-        provider: provider("beam", {
-          shareRoute: { routeSegment: "beam", hostId: "gateway" },
-        }),
-      },
-    ];
-
-    const respond = await call("sessions.catalog.list", { catalogId: "beam" });
-
-    expect(respond).toHaveBeenCalledWith(true, {
-      catalogs: [
-        expect.objectContaining({
-          id: "beam",
-          shareRoute: { routeSegment: "beam", hostId: "gateway" },
-        }),
-      ],
+  it("projects uniquely owned share routes and suppresses collisions", async () => {
+    hoisted.activeRegistry.sessionCatalogs.push({
+      provider: provider("external", { shareRoute: SHARE_ROUTE }),
     });
+    let catalogs = (
+      (await call("sessions.catalog.list", { catalogId: "external" })).mock.calls[0]![1] as {
+        catalogs: Array<{ shareRoute?: unknown }>;
+      }
+    ).catalogs;
+    expect(catalogs[0]?.shareRoute).toEqual(SHARE_ROUTE);
+
+    hoisted.activeRegistry.sessionCatalogs = [
+      { provider: provider("first", { shareRoute: SHARE_ROUTE }) },
+      { provider: provider("second", { shareRoute: SHARE_ROUTE }) },
+    ];
+    catalogs = (
+      (await call("sessions.catalog.list", {})).mock.calls[0]![1] as { catalogs: typeof catalogs }
+    ).catalogs;
+    expect(catalogs.every((catalog) => catalog.shareRoute === undefined)).toBe(true);
   });
 
   it("streams completed hosts to only the requesting connection", async () => {
diff --git a/src/gateway/server-methods/session-catalog.ts b/src/gateway/server-methods/session-catalog.ts
index 7f67c56a7c2d..a1ca001eb620 100644
--- a/src/gateway/server-methods/session-catalog.ts
+++ b/src/gateway/server-methods/session-catalog.ts
@@ -5,6 +5,7 @@ import {
   errorShape,
   type SessionCatalog,
   type SessionCatalogLocator,
+  type SessionCatalogShareRoute,
   type SessionsCatalogArchiveParams,
   type SessionsCatalogContinueParams,
   type SessionsCatalogListParams,
@@ -13,6 +14,7 @@ import {
   validateSessionsCatalogContinueParams,
   validateSessionsCatalogListParams,
   validateSessionsCatalogReadParams,
+  validateSessionCatalogShareRoute,
 } from "../../../packages/gateway-protocol/src/index.js";
 import type { OpenClawConfig } from "../../config/types.openclaw.js";
 import { pruneMapToMaxSize } from "../../infra/map-size.js";
@@ -75,6 +77,7 @@ type CatalogRegistrationSnapshot = {
   source: PluginRegistry["sessionCatalogs"] | undefined;
   registrations: PluginRegistry["sessionCatalogs"];
   providers: SessionCatalogProvider[];
+  shareRoutes: ReadonlyMap<SessionCatalogProvider, SessionCatalogShareRoute>;
 };
 
 let cachedCatalogRegistrations: CatalogRegistrationSnapshot | undefined;
@@ -91,6 +94,21 @@ function catalogRegistrationSnapshot(): CatalogRegistrationSnapshot {
   const sortedRegistrations = (source ?? []).toSorted((left, right) =>
     left.provider.id.localeCompare(right.provider.id),
   );
+  const providerList = sortedRegistrations.map((entry) => entry.provider);
+  const validRoutes = providerList.flatMap((provider) =>
+    provider.shareRoute && validateSessionCatalogShareRoute(provider.shareRoute)
+      ? [{ provider, route: provider.shareRoute }]
+      : [],
+  );
+  const routeCounts = new Map<string, number>();
+  for (const { route } of validRoutes) {
+    routeCounts.set(route.routeSegment, (routeCounts.get(route.routeSegment) ?? 0) + 1);
+  }
+  const shareRoutes = new Map(
+    validRoutes
+      .filter(({ route }) => routeCounts.get(route.routeSegment) === 1)
+      .map(({ provider, route }) => [provider, route] as const),
+  );
   // Plugin registration arrays are process-stable until the active registry seam changes. Hoisting
   // this sort avoids rebuilding identical order every poll; registry/list identity invalidates it.
   // A stale snapshot would route requests to retired plugin instances, so callers share this owner.
@@ -98,7 +116,8 @@ function catalogRegistrationSnapshot(): CatalogRegistrationSnapshot {
     registry,
     source,
     registrations: sortedRegistrations,
-    providers: sortedRegistrations.map((entry) => entry.provider),
+    providers: providerList,
+    shareRoutes,
   };
   return cachedCatalogRegistrations;
 }
@@ -310,6 +329,7 @@ function registrationOrRespond(catalogId: string, respond: RespondFn) {
 
 function catalogResult(
   provider: SessionCatalogProvider,
+  shareRoute: SessionCatalogShareRoute | undefined,
   hosts: SessionCatalog["hosts"],
   error?: SessionCatalog["error"],
   createSession?: NonNullable<SessionCatalog["capabilities"]["createSession"]>,
@@ -323,7 +343,7 @@ function catalogResult(
       ...(provider.openTerminal ? { openTerminal: true } : {}),
       ...(createSession ? { createSession } : {}),
     },
-    ...(provider.shareRoute ? { shareRoute: provider.shareRoute } : {}),
+    ...(shareRoute ? { shareRoute } : {}),
     hosts,
   };
   if (error) {
@@ -429,6 +449,7 @@ export const sessionCatalogHandlers: GatewayRequestHandlers = {
       const listNodes = createSessionCatalogRequestNodeSnapshot();
       const catalogList = await Promise.all(
         selected.map(async (provider): Promise<SessionCatalog> => {
+          const shareRoute = catalogRegistrations.shareRoutes.get(provider);
           const createTarget = resolveProviderCreateTarget(provider, resolvedAgent.agentId, config);
           const createSession = createTarget.ok
             ? {
@@ -441,7 +462,13 @@ export const sessionCatalogHandlers: GatewayRequestHandlers = {
               requestEntries.projectHostCreatedActors(host),
               visibility,
             );
-            const catalog = catalogResult(provider, [visibleHost], undefined, createSession);
+            const catalog = catalogResult(
+              provider,
+              shareRoute,
+              [visibleHost],
+              undefined,
+              createSession,
+            );
             // Progressive frames are an optimization. The final RPC response remains
             // authoritative when a slow client drops an intermediate host update.
             for (const subscriber of progressSubscribers.values()) {
@@ -471,6 +498,7 @@ export const sessionCatalogHandlers: GatewayRequestHandlers = {
             });
             return catalogResult(
               provider,
+              shareRoute,
               hosts.map((host) =>
                 filterSessionCatalogHost(requestEntries.projectHostCreatedActors(host), visibility),
               ),
@@ -478,7 +506,7 @@ export const sessionCatalogHandlers: GatewayRequestHandlers = {
               createSession,
             );
           } catch (error) {
-            return catalogResult(provider, [], catalogError(error), createSession);
+            return catalogResult(provider, shareRoute, [], catalogError(error), createSession);
           }
         }),
       );
diff --git a/src/plugin-sdk/session-catalog.test.ts b/src/plugin-sdk/session-catalog.test.ts
index b92338f74ec0..9912e5873b47 100644
--- a/src/plugin-sdk/session-catalog.test.ts
+++ b/src/plugin-sdk/session-catalog.test.ts
@@ -5,6 +5,7 @@ import {
   sessionCatalogPaging,
   sessionCatalogAdoptedSourceKey,
   type SessionCatalogFamilyOptions,
+  type SessionCatalogProvider,
   type SessionCatalogSession,
 } from "./session-catalog.js";
 
@@ -26,6 +27,32 @@ const session = (threadId: string): SessionCatalogSession => ({
 });
 
 describe("session catalog SDK", () => {
+  it("exposes the closed share-route contract to external providers", () => {
+    const shareRoute = {
+      kind: "thread-id-prefix",
+      routeSegment: "shared-sessions",
+      hostId: "gateway",
+      identifierAlphabet: "lowercase-hex",
+      fullLength: 32,
+      minPrefixLength: 12,
+      lookup: "catalog-list-search-by-thread-id-prefix",
+      ambiguity: "multiple-results-or-next-cursor",
+    } as const satisfies NonNullable<SessionCatalogProvider["shareRoute"]>;
+    const provider = {
+      id: "external",
+      label: "External",
+      shareRoute,
+      async list() {
+        return [];
+      },
+      async read({ hostId, threadId }) {
+        return { hostId, threadId, items: [] };
+      },
+    } satisfies SessionCatalogProvider;
+
+    expect(provider.shareRoute).toEqual(shareRoute);
+  });
+
   it("owns canonical list/read parameter and cursor parsing", () => {
     const cursor = sessionCatalogPaging.encodeCursor(2);
     expect(
diff --git a/src/plugins/session-catalog.ts b/src/plugins/session-catalog.ts
index 80be8f33fd0c..2460642284ab 100644
--- a/src/plugins/session-catalog.ts
+++ b/src/plugins/session-catalog.ts
@@ -173,7 +173,7 @@ type SessionCatalogCreateParams = {
 export type SessionCatalogProvider = {
   id: string;
   label: string;
-  /** Optional plugin-owned pretty route backed by exact prefix search on one catalog host. */
+  /** Closed plugin-owned route contract; invalid or colliding declarations are not projected. */
   shareRoute?: SessionCatalogShareRoute;
   /** Declares that every HOME-sensitive action honors the host isolation policy. */
   supportsProcessHomeIsolation?: true;
diff --git a/ui/src/app-route-paths.test.ts b/ui/src/app-route-paths.test.ts
index c531ab321b15..ebd76d69e510 100644
--- a/ui/src/app-route-paths.test.ts
+++ b/ui/src/app-route-paths.test.ts
@@ -108,6 +108,10 @@ describe("Dynamic route startup bridge", () => {
     expect(inferBasePathFromPathname("/openclaw/beam/0123456789ab")).toBe("/openclaw");
     expect(routeIdFromPath("/settings/about")).toBe("about");
     expect(routeIdFromPath("/workboard/0123456789ab")).toBe("workboard");
+    expect(routeIdFromPath("/plugin/0123456789ab")).toBeNull();
+    expect(routeIdFromPath("/usage/0123456789ab")).toBeNull();
+    expect(routeIdFromPath("/settings/0123456789ab")).toBeNull();
+    expect(routeIdFromPath("/openclaw/skills/0123456789ab", "/openclaw")).toBeNull();
   });
 
   it("registers the Updates settings path", () => {
diff --git a/ui/src/app-route-paths.ts b/ui/src/app-route-paths.ts
index 90aa85941565..85a958735bd2 100644
--- a/ui/src/app-route-paths.ts
+++ b/ui/src/app-route-paths.ts
@@ -77,11 +77,23 @@ const APP_ROUTE_DEFINITIONS = {
 
 export type RouteId = keyof typeof APP_ROUTE_DEFINITIONS;
 export const APP_ROUTE_IDS = Object.keys(APP_ROUTE_DEFINITIONS) as RouteId[];
+const RESERVED_APP_ROUTE_SEGMENTS = new Set(
+  APP_ROUTE_IDS.flatMap((routeId) => {
+    const definition = APP_ROUTE_DEFINITIONS[routeId];
+    const paths: readonly string[] =
+      "aliases" in definition ? [definition.path, ...definition.aliases] : [definition.path];
+    return paths.map((path) => path.split("/").find(Boolean)).filter(Boolean);
+  }),
+);
 
 export function isRouteId(routeId: string): routeId is RouteId {
   return routeId in APP_ROUTE_DEFINITIONS;
 }
 
+export function isReservedAppRouteSegment(segment: string): boolean {
+  return RESERVED_APP_ROUTE_SEGMENTS.has(segment.toLowerCase());
+}
+
 // Single source for page definitions: ui/src/pages/*/route.ts spreads this
 // into definePage so router matching can never drift from the table that
 // drives routeIdFromPath and base-path inference.
@@ -239,7 +251,11 @@ export function sessionRouteNamespaceFromPath(pathname: string, basePath = ""):
     pathname: normalizedPath,
     basePath: normalizedBasePath,
   });
-  return catalogShare && !catalogShare.shortId.includes("/") ? "chat" : null;
+  return catalogShare &&
+    !catalogShare.shortId.includes("/") &&
+    !isReservedAppRouteSegment(catalogShare.routeSegment)
+    ? "chat"
+    : null;
 }
 
 export function workboardBoardIdFromPath(pathname: string, basePath = ""): string | null {
diff --git a/ui/src/e2e/external-session-catalogs.e2e.test.ts b/ui/src/e2e/external-session-catalogs.e2e.test.ts
index 4e8b946359d5..6483bf7356ec 100644
--- a/ui/src/e2e/external-session-catalogs.e2e.test.ts
+++ b/ui/src/e2e/external-session-catalogs.e2e.test.ts
@@ -10,6 +10,17 @@ const suite = createControlUiE2eSuite({
   unavailableMessage: (executablePath) => `Playwright Chromium is unavailable at ${executablePath}`,
 });
 
+const SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "beam",
+  hostId: "gateway",
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const;
+
 suite.define(() => {
   it("opens and refreshes a base-path Beam share without replacing its pretty URL", async () => {
     const artifactDir = path.resolve(".artifacts/control-ui-e2e/beam-share-url");
@@ -36,7 +47,7 @@ suite.define(() => {
               id: "beam",
               label: "Beam",
               capabilities: { continueSession: false, archive: false },
-              shareRoute: { routeSegment: "beam", hostId: "gateway" },
+              shareRoute: SHARE_ROUTE,
               hosts: [
                 {
                   hostId: "gateway",
diff --git a/ui/src/lib/sessions/route-navigation.test.ts b/ui/src/lib/sessions/route-navigation.test.ts
index ad91dd9e3854..613b36cb3509 100644
--- a/ui/src/lib/sessions/route-navigation.test.ts
+++ b/ui/src/lib/sessions/route-navigation.test.ts
@@ -10,6 +10,17 @@ import {
   sessionNavigationTarget,
 } from "./route-navigation.ts";
 
+const SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "beam",
+  hostId: "gateway",
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const;
+
 describe("sessionNavigationTarget", () => {
   it("defaults generic opens to chat and honors a stored dashboard preference", () => {
     expect(resolveSessionPreferredFace(undefined)).toBe("chat");
@@ -54,7 +65,7 @@ describe("sessionNavigationTarget", () => {
       }),
       fallbackAgentId: "main",
       basePath: "/openclaw",
-      catalogShareRoute: { routeSegment: "beam", hostId: "gateway" },
+      catalogShareRoute: SHARE_ROUTE,
     });
 
     expect(target).toEqual({
@@ -63,6 +74,23 @@ describe("sessionNavigationTarget", () => {
     });
   });
 
+  it("keeps generic catalog URLs when a descriptor collides with a built-in route", () => {
+    const target = sessionNavigationTarget({
+      face: "chat",
+      sessionKey: buildCatalogSessionKey({
+        catalogId: "external",
+        hostId: "gateway",
+        threadId: "0123456789abcdef0123456789abcdef",
+      }),
+      fallbackAgentId: "main",
+      catalogShareRoute: { ...SHARE_ROUTE, routeSegment: "plugin" },
+    });
+
+    expect(target.href).toBe(
+      "/chat/main?catalog=external&host=gateway&thread=0123456789abcdef0123456789abcdef",
+    );
+  });
+
   it("requires the destination face while preserving catalog identity", () => {
     const catalogKey = {
       catalogId: "claude",
diff --git a/ui/src/lib/sessions/route-navigation.ts b/ui/src/lib/sessions/route-navigation.ts
index 6077ca3eea3b..6ab453cf78fe 100644
--- a/ui/src/lib/sessions/route-navigation.ts
+++ b/ui/src/lib/sessions/route-navigation.ts
@@ -2,7 +2,7 @@ import { normalizeOptionalString } from "@openclaw/normalization-core/string-coe
 import { buildControlUiCatalogSharePath } from "@openclaw/session-url-contract/share";
 import type { SessionCatalog } from "../../../../packages/gateway-protocol/src/index.ts";
 import type { GatewaySessionRow } from "../../api/types.ts";
-import { pathForRoute } from "../../app-route-paths.ts";
+import { isReservedAppRouteSegment, pathForRoute } from "../../app-route-paths.ts";
 import { pathForSession } from "../../app-session-path-builder.ts";
 import type { ApplicationNavigationOptions, ApplicationContext } from "../../app/context.ts";
 import type { BoardFace } from "../board/settings.ts";
@@ -170,9 +170,11 @@ export function sessionNavigationTarget<TRouteId extends string>(
   const catalogKey = parseCatalogSessionKey(row?.key ?? sessionKey);
   const catalogShareRoute = params.catalogShareRoute;
   const catalogSharePath =
-    catalogKey && catalogShareRoute?.hostId === catalogKey.hostId
+    catalogKey &&
+    catalogShareRoute?.hostId === catalogKey.hostId &&
+    !isReservedAppRouteSegment(catalogShareRoute.routeSegment)
       ? buildControlUiCatalogSharePath({
-          ...catalogShareRoute,
+          shareRoute: catalogShareRoute,
           threadId: catalogKey.threadId,
           basePath,
         })
diff --git a/ui/src/pages/chat/route-loader-catalog-share.test.ts b/ui/src/pages/chat/route-loader-catalog-share.test.ts
index 16dead261065..6109964be0c8 100644
--- a/ui/src/pages/chat/route-loader-catalog-share.test.ts
+++ b/ui/src/pages/chat/route-loader-catalog-share.test.ts
@@ -5,6 +5,16 @@ import { buildCatalogSessionKey } from "../../lib/sessions/catalog-key.ts";
 import { loadChatRoute } from "./route-loader.ts";
 
 const fullId = "0123456789abcdef0123456789abcdef";
+const SHARE_ROUTE = {
+  kind: "thread-id-prefix",
+  routeSegment: "beam",
+  hostId: "gateway",
+  identifierAlphabet: "lowercase-hex",
+  fullLength: 32,
+  minPrefixLength: 12,
+  lookup: "catalog-list-search-by-thread-id-prefix",
+  ambiguity: "multiple-results-or-next-cursor",
+} as const;
 
 function catalogContext(
   request: (method: string, params: Record<string, unknown>) => Promise<unknown>,
@@ -27,7 +37,7 @@ function beamCatalog(sessions: Array<{ threadId: string; name: string }>, nextCu
         id: "beam",
         label: "Beam",
         capabilities: { continueSession: false, archive: false },
-        shareRoute: { routeSegment: "beam", hostId: "gateway" },
+        shareRoute: SHARE_ROUTE,
         hosts: [
           {
             hostId: "gateway",
@@ -50,6 +60,39 @@ function beamCatalog(sessions: Array<{ threadId: string; name: string }>, nextCu
 }
 
 describe("catalog share route resolution", () => {
+  it("resolves an external-style provider descriptor without catalog-specific UI policy", async () => {
+    const shareRoute = { ...SHARE_ROUTE, routeSegment: "shared-sessions" } as const;
+    const request = vi.fn(async () => {
+      const result = beamCatalog([{ threadId: fullId, name: "External session" }]);
+      return {
+        catalogs: [
+          {
+            ...result.catalogs[0],
+            id: "external",
+            label: "External",
+            shareRoute,
+          },
+        ],
+      };
+    });
+
+    await expect(
+      loadChatRoute(
+        catalogContext(request),
+        { pathname: "/shared-sessions/0123456789ab", search: "", hash: "" },
+        "chat",
+        new AbortController().signal,
+      ),
+    ).resolves.toMatchObject({
+      kind: "session",
+      sessionKey: buildCatalogSessionKey({
+        catalogId: "external",
+        hostId: "gateway",
+        threadId: fullId,
+      }),
+    });
+  });
+
   it("resolves a base-path share independently of the default agent id", async () => {
     const request = vi.fn(async (method: string) => {
       if (method !== "sessions.catalog.list") {
@@ -164,4 +207,37 @@ describe("catalog share route resolution", () => {
       ),
     ).resolves.toMatchObject({ kind: "route-error" });
   });
+
+  it("keeps paginated empty results ambiguous and rejects duplicate declared hosts", async () => {
+    const paginated = catalogContext(vi.fn(async () => beamCatalog([], "more")));
+    await expect(
+      loadChatRoute(
+        paginated,
+        { pathname: "/beam/0123456789ab", search: "", hash: "" },
+        "chat",
+        new AbortController().signal,
+      ),
+    ).resolves.toMatchObject({ kind: "ambiguous", candidates: [], truncated: true });
+
+    const duplicateHost = catalogContext(
+      vi.fn(async () => {
+        const result = beamCatalog([{ threadId: fullId, name: "First" }]);
+        const catalog = result.catalogs[0];
+        if (!catalog) {
+          throw new Error("catalog fixture missing");
+        }
+        return {
+          catalogs: [{ ...catalog, hosts: [...catalog.hosts, { ...catalog.hosts[0] }] }],
+        };
+      }),
+    );
+    await expect(
+      loadChatRoute(
+        duplicateHost,
+        { pathname: "/beam/0123456789ab", search: "", hash: "" },
+        "chat",
+        new AbortController().signal,
+      ),
+    ).resolves.toMatchObject({ kind: "route-error" });
+  });
 });
diff --git a/ui/src/pages/chat/route-loader-catalog-share.ts b/ui/src/pages/chat/route-loader-catalog-share.ts
index e375275868f2..336f62956cc5 100644
--- a/ui/src/pages/chat/route-loader-catalog-share.ts
+++ b/ui/src/pages/chat/route-loader-catalog-share.ts
@@ -1,10 +1,11 @@
 import {
   buildControlUiCatalogSharePath,
+  isControlUiCatalogShareId,
   matchControlUiCatalogSharePath,
 } from "@openclaw/session-url-contract/share";
 import type { RouteLocation } from "@openclaw/uirouter";
 import type { SessionsCatalogListResult } from "../../../../packages/gateway-protocol/src/index.js";
-import { INTERNAL_SESSION_PATH_PARAM, isSessionRouteId } from "../../app-route-paths.ts";
+import { INTERNAL_SESSION_PATH_PARAM, isReservedAppRouteSegment } from "../../app-route-paths.ts";
 import type { ApplicationContext } from "../../app/context.ts";
 import { waitForGatewayClient } from "../../app/gateway-readiness.ts";
 import { t } from "../../i18n/index.ts";
@@ -18,7 +19,7 @@ function targetFromLocation(context: ApplicationContext, location: RouteLocation
     matchControlUiCatalogSharePath({ pathname, basePath: context.basePath });
   const internalPath = new URLSearchParams(location.search).get(INTERNAL_SESSION_PATH_PARAM);
   const target = (internalPath ? matchPath(internalPath) : null) ?? matchPath(location.pathname);
-  return target && !isSessionRouteId(target.routeSegment) ? target : null;
+  return target && !isReservedAppRouteSegment(target.routeSegment) ? target : null;
 }
 
 function routeError(message: string): Extract<ChatRouteData, { kind: "route-error" }> {
@@ -43,7 +44,7 @@ export async function loadCatalogShareRouteFromLocation(
     });
     const listed = await client.request<SessionsCatalogListResult>("sessions.catalog.list", {
       agentId,
-      ...(target.valid ? { search: target.shortId } : {}),
+      search: target.shortId,
       limitPerHost: 2,
     });
     signal.throwIfAborted();
@@ -55,37 +56,35 @@ export async function loadCatalogShareRouteFromLocation(
       return routeError(t("chat.sessionRoute.catalogShareUnavailable"));
     }
     const shareRoute = catalog.shareRoute;
-    if (!target.valid) {
+    if (!isControlUiCatalogShareId(shareRoute, target.shortId)) {
       return routeError(t("chat.sessionRoute.catalogShareInvalid", { catalog: catalog.label }));
     }
     if (catalog.error) {
       return routeError(catalog.error.message);
     }
-    const host = catalog.hosts.find((candidate) => candidate.hostId === shareRoute.hostId);
+    const matchingHosts = catalog.hosts.filter(
+      (candidate) => candidate.hostId === shareRoute.hostId,
+    );
+    const host = matchingHosts.length === 1 ? matchingHosts[0] : undefined;
     if (!host) {
       return routeError(t("chat.sessionRoute.catalogShareUnavailable"));
     }
     if (host?.error) {
       return routeError(host.error.message);
     }
-    const matches = host.sessions.filter((session) =>
-      session.threadId.toLowerCase().startsWith(target.shortId),
+    const matches = host.sessions.filter(
+      (session) =>
+        isControlUiCatalogShareId(shareRoute, session.threadId) &&
+        session.threadId.length === shareRoute.fullLength &&
+        session.threadId.startsWith(target.shortId),
     );
-    if (matches.length === 0) {
-      return routeError(
-        t("chat.sessionRoute.catalogShareNotFound", {
-          catalog: catalog.label,
-          shortId: target.shortId,
-        }),
-      );
-    }
     if (matches.length > 1 || host.nextCursor) {
       const candidates = matches.flatMap((session) => {
         const href = buildControlUiCatalogSharePath({
-          routeSegment: shareRoute.routeSegment,
+          shareRoute,
           threadId: session.threadId,
           basePath: context.basePath,
-          shortIdLength: 32,
+          prefixLength: shareRoute.fullLength,
         });
         return href
           ? [
@@ -106,15 +105,23 @@ export async function loadCatalogShareRouteFromLocation(
         face: "chat",
       };
     }
+    if (matches.length === 0) {
+      return routeError(
+        t("chat.sessionRoute.catalogShareNotFound", {
+          catalog: catalog.label,
+          shortId: target.shortId,
+        }),
+      );
+    }
     const session = matches[0];
     if (!session) {
       return routeError(t("chat.sessionRoute.catalogShareUnavailable"));
     }
     if (
       !buildControlUiCatalogSharePath({
-        routeSegment: shareRoute.routeSegment,
+        shareRoute,
         threadId: session.threadId,
-        shortIdLength: 32,
+        prefixLength: shareRoute.fullLength,
       })
     ) {
       return routeError(t("chat.sessionRoute.catalogShareUnavailable"));