diff --git a/src/plugin-sdk/config-runtime.ts b/src/plugin-sdk/config-runtime.ts
index 08d4d5f54011..abc13e0da0fb 100644
--- a/src/plugin-sdk/config-runtime.ts
+++ b/src/plugin-sdk/config-runtime.ts
@@ -5,6 +5,12 @@
  */
 
 import { loadSessionStore as loadSessionStoreImpl } from "../config/sessions/store-load.js";
+export {
+  getSessionEntry,
+  listSessionEntries,
+  updateSessionStoreEntry,
+  upsertSessionEntry,
+} from "./session-store-runtime.js";
 
 /**
  * @deprecated Use getSessionEntry/listSessionEntries for reads and
@@ -141,16 +147,12 @@ export type {
 } from "../config/types.js";
 export {
   clearSessionStoreCacheForTest,
-  getSessionEntry,
-  listSessionEntries,
   patchSessionEntry,
   readSessionUpdatedAt,
   recordSessionMetaFromInbound,
   saveSessionStore,
   updateLastRoute,
   updateSessionStore,
-  updateSessionStoreEntry,
-  upsertSessionEntry,
   resolveSessionStoreEntry,
 } from "../config/sessions/store.js";
 export { resolveSessionKey } from "../config/sessions/session-key.js";
diff --git a/src/plugin-sdk/session-store-runtime.test.ts b/src/plugin-sdk/session-store-runtime.test.ts
new file mode 100644
index 000000000000..fc3b670bf5af
--- /dev/null
+++ b/src/plugin-sdk/session-store-runtime.test.ts
@@ -0,0 +1,94 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import {
+  getSessionEntry,
+  listSessionEntries,
+  updateSessionStoreEntry,
+  upsertSessionEntry,
+} from "./session-store-runtime.js";
+
+describe("session-store-runtime compatibility surface", () => {
+  let tempDir: string;
+  let storePath: string;
+
+  beforeEach(() => {
+    tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "openclaw-sdk-session-store-"));
+    storePath = path.join(tempDir, "sessions.json");
+  });
+
+  afterEach(() => {
+    fs.rmSync(tempDir, { recursive: true, force: true });
+  });
+
+  it("keeps the public session read shape while using the accessor-backed exports", async () => {
+    const sessionKey = "agent:main:main";
+    await upsertSessionEntry({
+      sessionKey,
+      storePath,
+      entry: {
+        model: "gpt-5.5",
+        sessionId: "session-1",
+        updatedAt: 10,
+      },
+    });
+
+    expect(getSessionEntry({ sessionKey, storePath })).toMatchObject({
+      model: "gpt-5.5",
+      sessionId: "session-1",
+      updatedAt: 10,
+    });
+    expect(listSessionEntries({ storePath })).toEqual([
+      {
+        sessionKey,
+        entry: expect.objectContaining({
+          model: "gpt-5.5",
+          sessionId: "session-1",
+          updatedAt: 10,
+        }),
+      },
+    ]);
+
+    await upsertSessionEntry({
+      sessionKey,
+      storePath,
+      entry: {
+        sessionId: "session-1",
+        updatedAt: 20,
+      },
+    });
+    expect(getSessionEntry({ sessionKey, storePath })?.model).toBeUndefined();
+  });
+
+  it("keeps the public entry-update signature while delegating to the seam", async () => {
+    const sessionKey = "agent:main:main";
+
+    await expect(
+      updateSessionStoreEntry({
+        sessionKey,
+        storePath,
+        update: () => ({ model: "gpt-5.5" }),
+      }),
+    ).resolves.toBeNull();
+
+    await upsertSessionEntry({
+      sessionKey,
+      storePath,
+      entry: {
+        sessionId: "session-1",
+        updatedAt: 10,
+      },
+    });
+    await expect(
+      updateSessionStoreEntry({
+        sessionKey,
+        storePath,
+        update: () => ({ model: "gpt-5.5" }),
+      }),
+    ).resolves.toMatchObject({
+      model: "gpt-5.5",
+      sessionId: "session-1",
+    });
+  });
+});
diff --git a/src/plugin-sdk/session-store-runtime.ts b/src/plugin-sdk/session-store-runtime.ts
index c2761409401c..f225557a4da9 100644
--- a/src/plugin-sdk/session-store-runtime.ts
+++ b/src/plugin-sdk/session-store-runtime.ts
@@ -1,6 +1,44 @@
 // Narrow session-store helpers for channel hot paths.
 
+import {
+  listSessionEntries as listAccessorSessionEntries,
+  loadSessionEntry,
+  replaceSessionEntry,
+  updateSessionEntry,
+} from "../config/sessions/session-accessor.js";
 import { loadSessionStore as loadSessionStoreImpl } from "../config/sessions/store-load.js";
+import type { SessionEntry } from "../config/sessions/types.js";
+
+type SessionStoreReadParams = {
+  agentId?: string;
+  env?: NodeJS.ProcessEnv;
+  hydrateSkillPromptRefs?: boolean;
+  sessionKey: string;
+  storePath?: string;
+};
+
+type SessionStoreListParams = Partial<Omit<SessionStoreReadParams, "sessionKey">>;
+
+type SessionStoreEntrySummary = {
+  sessionKey: string;
+  entry: SessionEntry;
+};
+
+type SessionStoreEntryUpdate = (
+  entry: SessionEntry,
+) => Promise<Partial<SessionEntry> | null> | Partial<SessionEntry> | null;
+
+type UpdateSessionStoreEntryParams = {
+  storePath: string;
+  sessionKey: string;
+  update: SessionStoreEntryUpdate;
+  skipMaintenance?: boolean;
+  takeCacheOwnership?: boolean;
+};
+
+type UpsertSessionEntryParams = SessionStoreReadParams & {
+  entry: SessionEntry;
+};
 
 /**
  * @deprecated Use getSessionEntry/listSessionEntries for reads and
@@ -9,6 +47,60 @@ import { loadSessionStore as loadSessionStoreImpl } from "../config/sessions/sto
  */
 export const loadSessionStore = loadSessionStoreImpl;
 
+/** Loads one session entry through the accessor seam. */
+export function getSessionEntry(params: SessionStoreReadParams): SessionEntry | undefined {
+  return loadSessionEntry({
+    agentId: params.agentId,
+    env: params.env,
+    hydrateSkillPromptRefs: params.hydrateSkillPromptRefs,
+    sessionKey: params.sessionKey,
+    storePath: params.storePath,
+  });
+}
+
+/** Lists session entries through the accessor seam. */
+export function listSessionEntries(
+  params: SessionStoreListParams = {},
+): SessionStoreEntrySummary[] {
+  return listAccessorSessionEntries({
+    agentId: params.agentId,
+    env: params.env,
+    hydrateSkillPromptRefs: params.hydrateSkillPromptRefs,
+    storePath: params.storePath,
+  });
+}
+
+/** Updates an existing session entry through the accessor seam. */
+export async function updateSessionStoreEntry(
+  params: UpdateSessionStoreEntryParams,
+): Promise<SessionEntry | null> {
+  return await updateSessionEntry(
+    {
+      sessionKey: params.sessionKey,
+      storePath: params.storePath,
+    },
+    params.update,
+    {
+      skipMaintenance: params.skipMaintenance,
+      takeCacheOwnership: params.takeCacheOwnership,
+    },
+  );
+}
+
+/** Replaces or creates one session entry through the accessor seam. */
+export async function upsertSessionEntry(params: UpsertSessionEntryParams): Promise<void> {
+  await replaceSessionEntry(
+    {
+      agentId: params.agentId,
+      env: params.env,
+      hydrateSkillPromptRefs: params.hydrateSkillPromptRefs,
+      sessionKey: params.sessionKey,
+      storePath: params.storePath,
+    },
+    params.entry,
+  );
+}
+
 export { resolveSessionStoreEntry } from "../config/sessions/store-entry.js";
 export {
   resolveSessionFilePath,
@@ -22,16 +114,12 @@ export { resolveGroupSessionKey } from "../config/sessions/group.js";
 export { canonicalizeMainSessionAlias } from "../config/sessions/main-session.js";
 export {
   clearSessionStoreCacheForTest,
-  getSessionEntry,
-  listSessionEntries,
   patchSessionEntry,
   readSessionUpdatedAt,
   recordSessionMetaFromInbound,
   saveSessionStore,
   updateLastRoute,
   updateSessionStore,
-  updateSessionStoreEntry,
-  upsertSessionEntry,
 } from "../config/sessions/store.js";
 export {
   evaluateSessionFreshness,
diff --git a/src/plugins/runtime/runtime-agent.ts b/src/plugins/runtime/runtime-agent.ts
index 70576a9325bf..8777eba0bc6b 100644
--- a/src/plugins/runtime/runtime-agent.ts
+++ b/src/plugins/runtime/runtime-agent.ts
@@ -11,19 +11,51 @@ import { normalizeThinkLevel, resolveThinkingProfile } from "../../auto-reply/th
 import { getRuntimeConfig } from "../../config/config.js";
 import { resolveSessionFilePath, resolveStorePath } from "../../config/sessions/paths.js";
 import {
-  getSessionEntry,
-  listSessionEntries,
+  listSessionEntries as listAccessorSessionEntries,
+  loadSessionEntry,
+  replaceSessionEntry,
+  updateSessionEntry,
+} from "../../config/sessions/session-accessor.js";
+import {
   loadSessionStore,
   patchSessionEntry,
   saveSessionStore,
   updateSessionStore,
-  updateSessionStoreEntry,
-  upsertSessionEntry,
 } from "../../config/sessions/store.js";
+import type { SessionEntry } from "../../config/sessions/types.js";
 import { createLazyRuntimeMethod, createLazyRuntimeModule } from "../../shared/lazy-runtime.js";
 import { defineCachedValue } from "./runtime-cache.js";
 import type { PluginRuntime } from "./types.js";
 
+type RuntimeSessionStoreReadParams = {
+  agentId?: string;
+  env?: NodeJS.ProcessEnv;
+  hydrateSkillPromptRefs?: boolean;
+  sessionKey: string;
+  storePath?: string;
+};
+
+type RuntimeSessionStoreListParams = Partial<Omit<RuntimeSessionStoreReadParams, "sessionKey">>;
+
+type RuntimeSessionStoreEntrySummary = {
+  sessionKey: string;
+  entry: SessionEntry;
+};
+
+type RuntimeSessionStoreEntryUpdateParams = {
+  storePath: string;
+  sessionKey: string;
+  update: (
+    entry: SessionEntry,
+  ) => Promise<Partial<SessionEntry> | null> | Partial<SessionEntry> | null;
+  skipMaintenance?: boolean;
+  takeCacheOwnership?: boolean;
+};
+
+type RuntimeUpsertSessionEntryParams = RuntimeSessionStoreReadParams & {
+  entry: SessionEntry;
+};
+
 const loadEmbeddedAgentRuntime = createLazyRuntimeModule(
   () => import("./runtime-embedded-agent.runtime.js"),
 );
@@ -38,6 +70,60 @@ function resolveRuntimeThinkingCatalog(
   return configuredCatalog.length > 0 ? configuredCatalog : undefined;
 }
 
+function getSessionEntry(params: RuntimeSessionStoreReadParams): SessionEntry | undefined {
+  return loadSessionEntry({
+    agentId: params.agentId,
+    env: params.env,
+    hydrateSkillPromptRefs: params.hydrateSkillPromptRefs,
+    sessionKey: params.sessionKey,
+    storePath: params.storePath,
+  });
+}
+
+function listSessionEntries(
+  params: RuntimeSessionStoreListParams = {},
+): RuntimeSessionStoreEntrySummary[] {
+  return listAccessorSessionEntries({
+    agentId: params.agentId,
+    env: params.env,
+    hydrateSkillPromptRefs: params.hydrateSkillPromptRefs,
+    storePath: params.storePath,
+  });
+}
+
+async function updateSessionStoreEntry(
+  params: RuntimeSessionStoreEntryUpdateParams,
+): Promise<SessionEntry | null> {
+  // Preserve the plugin runtime's object-parameter API while routing the actual
+  // mutation through the storage-neutral session accessor seam.
+  return await updateSessionEntry(
+    {
+      sessionKey: params.sessionKey,
+      storePath: params.storePath,
+    },
+    params.update,
+    {
+      skipMaintenance: params.skipMaintenance,
+      takeCacheOwnership: params.takeCacheOwnership,
+    },
+  );
+}
+
+async function upsertSessionEntry(params: RuntimeUpsertSessionEntryParams): Promise<void> {
+  // The public runtime helper historically replaced the full entry. Use the
+  // replace seam so removed fields do not survive as merge leftovers.
+  await replaceSessionEntry(
+    {
+      agentId: params.agentId,
+      env: params.env,
+      hydrateSkillPromptRefs: params.hydrateSkillPromptRefs,
+      sessionKey: params.sessionKey,
+      storePath: params.storePath,
+    },
+    params.entry,
+  );
+}
+
 /** Creates the plugin runtime agent facade with lazy embedded-agent/session helpers. */
 export function createRuntimeAgent(): PluginRuntime["agent"] {
   const agentRuntime = {
diff --git a/src/plugins/runtime/types-core.ts b/src/plugins/runtime/types-core.ts
index 8b1a0a0cd3d9..cfa4cd152d3f 100644
--- a/src/plugins/runtime/types-core.ts
+++ b/src/plugins/runtime/types-core.ts
@@ -204,10 +204,45 @@ export type PluginRuntimeCore = {
     ensureAgentWorkspace: typeof import("../../agents/workspace.js").ensureAgentWorkspace;
     session: {
       resolveStorePath: typeof import("../../config/sessions/paths.js").resolveStorePath;
-      getSessionEntry: typeof import("../../config/sessions/store.js").getSessionEntry;
-      listSessionEntries: typeof import("../../config/sessions/store.js").listSessionEntries;
+      getSessionEntry: (params: {
+        agentId?: string;
+        env?: NodeJS.ProcessEnv;
+        hydrateSkillPromptRefs?: boolean;
+        sessionKey: string;
+        storePath?: string;
+      }) => import("../../config/sessions/types.js").SessionEntry | undefined;
+      listSessionEntries: (
+        params?: Partial<{
+          agentId: string;
+          env: NodeJS.ProcessEnv;
+          hydrateSkillPromptRefs: boolean;
+          storePath: string;
+        }>,
+      ) => Array<{
+        sessionKey: string;
+        entry: import("../../config/sessions/types.js").SessionEntry;
+      }>;
       patchSessionEntry: typeof import("../../config/sessions/store.js").patchSessionEntry;
-      upsertSessionEntry: typeof import("../../config/sessions/store.js").upsertSessionEntry;
+      upsertSessionEntry: (params: {
+        agentId?: string;
+        env?: NodeJS.ProcessEnv;
+        hydrateSkillPromptRefs?: boolean;
+        sessionKey: string;
+        storePath?: string;
+        entry: import("../../config/sessions/types.js").SessionEntry;
+      }) => Promise<void>;
+      updateSessionStoreEntry: (params: {
+        storePath: string;
+        sessionKey: string;
+        update: (
+          entry: import("../../config/sessions/types.js").SessionEntry,
+        ) =>
+          | Promise<Partial<import("../../config/sessions/types.js").SessionEntry> | null>
+          | Partial<import("../../config/sessions/types.js").SessionEntry>
+          | null;
+        skipMaintenance?: boolean;
+        takeCacheOwnership?: boolean;
+      }) => Promise<import("../../config/sessions/types.js").SessionEntry | null>;
       /**
        * @deprecated Use getSessionEntry/listSessionEntries for reads and
        * patchSessionEntry/upsertSessionEntry for writes. This keeps the legacy
@@ -216,7 +251,6 @@ export type PluginRuntimeCore = {
       loadSessionStore: typeof import("../../config/sessions/store-load.js").loadSessionStore;
       saveSessionStore: import("../../config/sessions/runtime-types.js").SaveSessionStore;
       updateSessionStore: typeof import("../../config/sessions/store.js").updateSessionStore;
-      updateSessionStoreEntry: typeof import("../../config/sessions/store.js").updateSessionStoreEntry;
       resolveSessionFilePath: typeof import("../../config/sessions/paths.js").resolveSessionFilePath;
     };
   };