diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9b17ee6448..aa467af2ccd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,7 @@ Docs: https://docs.openclaw.ai
 - Exec approvals/allowlist matching: escape regex metacharacters in path-pattern literals (while preserving glob wildcards), preventing crashes on allowlisted executables like `/usr/bin/g++` and correctly matching mixed wildcard/literal token paths. (#32162) Thanks @stakeswky.
 - Agents/tool-result guard: always clear pending tool-call state on interruptions even when synthetic tool results are disabled, preventing orphaned tool-use transcripts that cause follow-up provider request failures. (#32120) Thanks @jnMetaCode.
 - Hooks/after_tool_call: include embedded session context (`sessionKey`, `agentId`) and fire the hook exactly once per tool execution by removing duplicate adapter-path dispatch in embedded runs. (#32201) Thanks @jbeno, @scoootscooob, @vincentkoc.
+- Hooks/session-scoped memory context: expose ephemeral `sessionId` in embedded plugin tool contexts and `before_tool_call`/`after_tool_call` hook contexts (including compaction and client-tool wiring) so plugins can isolate per-conversation state across `/new` and `/reset`. Related #31253 and #31304. Thanks @Sid-Qin and @Servo-AIpex.
 - Webchat/stream finalization: persist streamed assistant text when final events omit `message`, while keeping final payload precedence and skipping empty stream buffers to prevent disappearing replies after tool turns. (#31920) Thanks @Sid-Qin.
 - Cron/store migration: normalize legacy cron jobs with string `schedule` and top-level `command`/`timeout` fields into canonical schedule/payload/session-target shape on load, preventing schedule-error loops on old persisted stores. (#31926) Thanks @bmendonca3.
 - Gateway/Heartbeat model reload: treat `models.*` and `agents.defaults.model` config updates as heartbeat hot-reload triggers so heartbeat picks up model changes without a full gateway restart. (#32046) Thanks @stakeswky.
diff --git a/src/agents/openclaw-tools.plugin-context.test.ts b/src/agents/openclaw-tools.plugin-context.test.ts
index ea2898476ad..1cf9116a98e 100644
--- a/src/agents/openclaw-tools.plugin-context.test.ts
+++ b/src/agents/openclaw-tools.plugin-context.test.ts
@@ -30,4 +30,21 @@ describe("createOpenClawTools plugin context", () => {
       }),
     );
   });
+
+  it("forwards ephemeral sessionId to plugin tool context", () => {
+    createOpenClawTools({
+      config: {} as never,
+      agentSessionKey: "agent:main:telegram:direct:12345",
+      sessionId: "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+    });
+
+    expect(resolvePluginToolsMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        context: expect.objectContaining({
+          sessionKey: "agent:main:telegram:direct:12345",
+          sessionId: "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+        }),
+      }),
+    );
+  });
 });
diff --git a/src/agents/openclaw-tools.ts b/src/agents/openclaw-tools.ts
index f0f91a27148..cbd9b7b4140 100644
--- a/src/agents/openclaw-tools.ts
+++ b/src/agents/openclaw-tools.ts
@@ -70,6 +70,8 @@ export function createOpenClawTools(options?: {
   requesterSenderId?: string | null;
   /** Whether the requesting sender is an owner. */
   senderIsOwner?: boolean;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
 }): AnyAgentTool[] {
   const workspaceDir = resolveWorkspaceRoot(options?.workspaceDir);
   const imageTool = options?.agentDir?.trim()
@@ -199,6 +201,7 @@ export function createOpenClawTools(options?: {
         config: options?.config,
       }),
       sessionKey: options?.agentSessionKey,
+      sessionId: options?.sessionId,
       messageChannel: options?.agentChannel,
       agentAccountId: options?.agentAccountId,
       requesterSenderId: options?.requesterSenderId ?? undefined,
diff --git a/src/agents/pi-embedded-runner/compact.ts b/src/agents/pi-embedded-runner/compact.ts
index a6be0ca47d0..361d5f8593a 100644
--- a/src/agents/pi-embedded-runner/compact.ts
+++ b/src/agents/pi-embedded-runner/compact.ts
@@ -370,6 +370,7 @@ export async function compactEmbeddedPiSessionDirect(
       messageProvider: params.messageChannel ?? params.messageProvider,
       agentAccountId: params.agentAccountId,
       sessionKey: sandboxSessionKey,
+      sessionId: params.sessionId,
       groupId: params.groupId,
       groupChannel: params.groupChannel,
       groupSpace: params.groupSpace,
diff --git a/src/agents/pi-embedded-runner/run/attempt.ts b/src/agents/pi-embedded-runner/run/attempt.ts
index fa2b508f15c..5acd5cdaaab 100644
--- a/src/agents/pi-embedded-runner/run/attempt.ts
+++ b/src/agents/pi-embedded-runner/run/attempt.ts
@@ -585,6 +585,7 @@ export async function runEmbeddedAttempt(
           senderE164: params.senderE164,
           senderIsOwner: params.senderIsOwner,
           sessionKey: sandboxSessionKey,
+          sessionId: params.sessionId,
           agentDir,
           workspaceDir: effectiveWorkspace,
           config: params.config,
@@ -858,7 +859,8 @@ export async function runEmbeddedAttempt(
             },
             {
               agentId: sessionAgentId,
-              sessionKey: params.sessionKey,
+              sessionKey: sandboxSessionKey,
+              sessionId: params.sessionId,
               loopDetection: clientToolLoopDetection,
             },
           )
@@ -1186,6 +1188,7 @@ export async function runEmbeddedAttempt(
         enforceFinalTag: params.enforceFinalTag,
         config: params.config,
         sessionKey: sandboxSessionKey,
+        sessionId: params.sessionId,
         agentId: sessionAgentId,
       });
 
diff --git a/src/agents/pi-embedded-subscribe.handlers.tools.ts b/src/agents/pi-embedded-subscribe.handlers.tools.ts
index 4a76f62ff62..87e165c9c77 100644
--- a/src/agents/pi-embedded-subscribe.handlers.tools.ts
+++ b/src/agents/pi-embedded-subscribe.handlers.tools.ts
@@ -433,6 +433,7 @@ export async function handleToolExecutionEnd(
         toolName,
         agentId: ctx.params.agentId,
         sessionKey: ctx.params.sessionKey,
+        sessionId: ctx.params.sessionId,
       })
       .catch((err) => {
         ctx.log.warn(`after_tool_call hook failed: tool=${toolName} error=${String(err)}`);
diff --git a/src/agents/pi-embedded-subscribe.handlers.types.ts b/src/agents/pi-embedded-subscribe.handlers.types.ts
index d7488d767ad..1a9d48f46f0 100644
--- a/src/agents/pi-embedded-subscribe.handlers.types.ts
+++ b/src/agents/pi-embedded-subscribe.handlers.types.ts
@@ -132,7 +132,13 @@ export type EmbeddedPiSubscribeContext = {
  */
 export type ToolHandlerParams = Pick<
   SubscribeEmbeddedPiSessionParams,
-  "runId" | "onBlockReplyFlush" | "onAgentEvent" | "onToolResult" | "sessionKey" | "agentId"
+  | "runId"
+  | "onBlockReplyFlush"
+  | "onAgentEvent"
+  | "onToolResult"
+  | "sessionKey"
+  | "sessionId"
+  | "agentId"
 >;
 
 export type ToolHandlerState = Pick<
diff --git a/src/agents/pi-embedded-subscribe.types.ts b/src/agents/pi-embedded-subscribe.types.ts
index 426daf2fd15..689cd49998e 100644
--- a/src/agents/pi-embedded-subscribe.types.ts
+++ b/src/agents/pi-embedded-subscribe.types.ts
@@ -31,6 +31,8 @@ export type SubscribeEmbeddedPiSessionParams = {
   enforceFinalTag?: boolean;
   config?: OpenClawConfig;
   sessionKey?: string;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
   /** Agent identity for hook context — resolved from session config in attempt.ts. */
   agentId?: string;
 };
diff --git a/src/agents/pi-tools.before-tool-call.integration.e2e.test.ts b/src/agents/pi-tools.before-tool-call.integration.e2e.test.ts
index 643a14b0338..ec1d8c5d4f1 100644
--- a/src/agents/pi-tools.before-tool-call.integration.e2e.test.ts
+++ b/src/agents/pi-tools.before-tool-call.integration.e2e.test.ts
@@ -122,6 +122,7 @@ describe("before_tool_call hook integration", () => {
     const tool = wrapToolWithBeforeToolCallHook({ name: "ReAd", execute } as any, {
       agentId: "main",
       sessionKey: "main",
+      sessionId: "ephemeral-main",
     });
     const extensionContext = {} as Parameters<typeof tool.execute>[3];
 
@@ -136,6 +137,7 @@ describe("before_tool_call hook integration", () => {
         toolName: "read",
         agentId: "main",
         sessionKey: "main",
+        sessionId: "ephemeral-main",
       },
     );
   });
diff --git a/src/agents/pi-tools.before-tool-call.ts b/src/agents/pi-tools.before-tool-call.ts
index a0a5ca4cb11..45e48df02eb 100644
--- a/src/agents/pi-tools.before-tool-call.ts
+++ b/src/agents/pi-tools.before-tool-call.ts
@@ -9,6 +9,8 @@ import type { AnyAgentTool } from "./tools/common.js";
 export type HookContext = {
   agentId?: string;
   sessionKey?: string;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
   loopDetection?: ToolLoopDetectionConfig;
 };
 
@@ -148,6 +150,7 @@ export async function runBeforeToolCallHook(args: {
         toolName,
         agentId: args.ctx?.agentId,
         sessionKey: args.ctx?.sessionKey,
+        sessionId: args.ctx?.sessionId,
       },
     );
 
diff --git a/src/agents/pi-tools.ts b/src/agents/pi-tools.ts
index b5e9276b7fc..3f038e9aadf 100644
--- a/src/agents/pi-tools.ts
+++ b/src/agents/pi-tools.ts
@@ -188,6 +188,8 @@ export function createOpenClawCodingTools(options?: {
   messageThreadId?: string | number;
   sandbox?: SandboxContext | null;
   sessionKey?: string;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
   agentDir?: string;
   workspaceDir?: string;
   config?: OpenClawConfig;
@@ -493,6 +495,7 @@ export function createOpenClawCodingTools(options?: {
       requesterAgentIdOverride: agentId,
       requesterSenderId: options?.senderId,
       senderIsOwner: options?.senderIsOwner,
+      sessionId: options?.sessionId,
     }),
   ];
   const toolsForMessageProvider = applyMessageProviderToolPolicy(tools, options?.messageProvider);
@@ -533,6 +536,7 @@ export function createOpenClawCodingTools(options?: {
     wrapToolWithBeforeToolCallHook(tool, {
       agentId,
       sessionKey: options?.sessionKey,
+      sessionId: options?.sessionId,
       loopDetection: resolveToolLoopDetectionConfig({ cfg: options?.config, agentId }),
     }),
   );
diff --git a/src/plugins/types.ts b/src/plugins/types.ts
index 50ad451fd5e..96fd41f555e 100644
--- a/src/plugins/types.ts
+++ b/src/plugins/types.ts
@@ -61,6 +61,8 @@ export type OpenClawPluginToolContext = {
   agentDir?: string;
   agentId?: string;
   sessionKey?: string;
+  /** Ephemeral session UUID — regenerated on /new and /reset. Use for per-conversation isolation. */
+  sessionId?: string;
   messageChannel?: string;
   agentAccountId?: string;
   /** Trusted sender id from inbound context (runtime-provided, not tool args). */
@@ -482,6 +484,8 @@ export type PluginHookMessageSentEvent = {
 export type PluginHookToolContext = {
   agentId?: string;
   sessionKey?: string;
+  /** Ephemeral session UUID — regenerated on /new and /reset. */
+  sessionId?: string;
   toolName: string;
 };
 
diff --git a/src/plugins/wired-hooks-after-tool-call.e2e.test.ts b/src/plugins/wired-hooks-after-tool-call.e2e.test.ts
index 11d073e8356..a84c1ad492e 100644
--- a/src/plugins/wired-hooks-after-tool-call.e2e.test.ts
+++ b/src/plugins/wired-hooks-after-tool-call.e2e.test.ts
@@ -23,6 +23,7 @@ vi.mock("../infra/agent-events.js", () => ({
 function createToolHandlerCtx(params: {
   runId: string;
   sessionKey?: string;
+  sessionId?: string;
   agentId?: string;
   onBlockReplyFlush?: unknown;
 }) {
@@ -32,6 +33,7 @@ function createToolHandlerCtx(params: {
       session: { messages: [] },
       agentId: params.agentId,
       sessionKey: params.sessionKey,
+      sessionId: params.sessionId,
       onBlockReplyFlush: params.onBlockReplyFlush,
     },
     state: {
@@ -83,6 +85,7 @@ describe("after_tool_call hook wiring", () => {
       runId: "test-run-1",
       agentId: "main",
       sessionKey: "test-session",
+      sessionId: "test-ephemeral-session",
     });
 
     await handleToolExecutionStart(
@@ -90,7 +93,7 @@ describe("after_tool_call hook wiring", () => {
       {
         type: "tool_execution_start",
         toolName: "read",
-        toolCallId: "call-1",
+        toolCallId: "wired-hook-call-1",
         args: { path: "/tmp/file.txt" },
       } as never,
     );
@@ -100,7 +103,7 @@ describe("after_tool_call hook wiring", () => {
       {
         type: "tool_execution_end",
         toolName: "read",
-        toolCallId: "call-1",
+        toolCallId: "wired-hook-call-1",
         isError: false,
         result: { content: [{ type: "text", text: "file contents" }] },
       } as never,
@@ -115,7 +118,7 @@ describe("after_tool_call hook wiring", () => {
       | { toolName?: string; params?: unknown; error?: unknown; durationMs?: unknown }
       | undefined;
     const context = firstCall?.[1] as
-      | { toolName?: string; agentId?: string; sessionKey?: string }
+      | { toolName?: string; agentId?: string; sessionKey?: string; sessionId?: string }
       | undefined;
     expect(event).toBeDefined();
     expect(context).toBeDefined();
@@ -129,6 +132,7 @@ describe("after_tool_call hook wiring", () => {
     expect(context.toolName).toBe("read");
     expect(context.agentId).toBe("main");
     expect(context.sessionKey).toBe("test-session");
+    expect(context.sessionId).toBe("test-ephemeral-session");
   });
 
   it("includes error in after_tool_call event on tool failure", async () => {