diff --git a/.openclaw-sync/source.json b/.openclaw-sync/source.json
index 12c196d42..47f2dac03 100644
--- a/.openclaw-sync/source.json
+++ b/.openclaw-sync/source.json
@@ -1,5 +1,5 @@
 {
   "repository": "openclaw/openclaw",
-  "sha": "c19f322ff97412eaca6ed6b7e7ec2427181c7246",
-  "syncedAt": "2026-04-07T07:36:04.135Z"
+  "sha": "9e9730a55e2c81035a996cd1c925894c8e43ea2b",
+  "syncedAt": "2026-04-07T07:59:55.834Z"
 }
diff --git a/docs/.generated/plugin-sdk-api-baseline.sha256 b/docs/.generated/plugin-sdk-api-baseline.sha256
index 258f9e38b..cb1b30753 100644
--- a/docs/.generated/plugin-sdk-api-baseline.sha256
+++ b/docs/.generated/plugin-sdk-api-baseline.sha256
@@ -1,2 +1,2 @@
-8592ce4554f44cd5325f44f86d37b3057548853cc9bc543b0611e5d9000f262e  plugin-sdk-api-baseline.json
-35393eceb6733d966430369c116511bb15a4b83eec93ebfd3b9a3e8f9ee29cec  plugin-sdk-api-baseline.jsonl
+bcf997afb562b69552d0bf772ccad85b48df14cc3f314fdd5265644702fdfd2d  plugin-sdk-api-baseline.json
+fcef1106262e6d0f53d67d1f1e968b34cd49ed45c89972364fe6c7d9ffcf1f5b  plugin-sdk-api-baseline.jsonl
diff --git a/docs/concepts/context-engine.md b/docs/concepts/context-engine.md
index d24359c84..1e75e6e4e 100644
--- a/docs/concepts/context-engine.md
+++ b/docs/concepts/context-engine.md
@@ -115,6 +115,8 @@ engine is used automatically.
 A plugin can register a context engine using the plugin API:
 
 ```ts
+import { buildMemorySystemPromptAddition } from "openclaw/plugin-sdk/core";
+
 export default function register(api) {
   api.registerContextEngine("my-engine", () => ({
     info: {
@@ -128,12 +130,15 @@ export default function register(api) {
       return { ingested: true };
     },
 
-    async assemble({ sessionId, messages, tokenBudget }) {
+    async assemble({ sessionId, messages, tokenBudget, availableTools, citationsMode }) {
       // Return messages that fit the budget
       return {
         messages: buildContext(messages, tokenBudget),
         estimatedTokens: countTokens(messages),
-        systemPromptAddition: "Use lcm_grep to search history...",
+        systemPromptAddition: buildMemorySystemPromptAddition({
+          availableTools: availableTools ?? new Set(),
+          citationsMode,
+        }),
       };
     },
 
@@ -248,7 +253,13 @@ OpenClaw resolves when it needs a context engine.
 - **Memory plugins** (`plugins.slots.memory`) are separate from context engines.
   Memory plugins provide search/retrieval; context engines control what the
   model sees. They can work together — a context engine might use memory
-  plugin data during assembly.
+  plugin data during assembly. Plugin engines that want the active memory
+  prompt path should prefer `buildMemorySystemPromptAddition(...)` from
+  `openclaw/plugin-sdk/core`, which converts the active memory prompt sections
+  into a ready-to-prepend `systemPromptAddition`. If an engine needs lower-level
+  control, it can still pull raw lines from
+  `openclaw/plugin-sdk/memory-host-core` via
+  `buildActiveMemoryPromptSection(...)`.
 - **Session pruning** (trimming old tool results in-memory) still runs
   regardless of which context engine is active.
 
diff --git a/docs/plugins/architecture.md b/docs/plugins/architecture.md
index 82923d97e..8ee58b42e 100644
--- a/docs/plugins/architecture.md
+++ b/docs/plugins/architecture.md
@@ -1494,14 +1494,23 @@ Use this when your plugin needs to replace or extend the default context
 pipeline rather than just add memory search or hooks.
 
 ```ts
+import { buildMemorySystemPromptAddition } from "openclaw/plugin-sdk/core";
+
 export default function (api) {
   api.registerContextEngine("lossless-claw", () => ({
     info: { id: "lossless-claw", name: "Lossless Claw", ownsCompaction: true },
     async ingest() {
       return { ingested: true };
     },
-    async assemble({ messages }) {
-      return { messages, estimatedTokens: 0 };
+    async assemble({ messages, availableTools, citationsMode }) {
+      return {
+        messages,
+        estimatedTokens: 0,
+        systemPromptAddition: buildMemorySystemPromptAddition({
+          availableTools: availableTools ?? new Set(),
+          citationsMode,
+        }),
+      };
     },
     async compact() {
       return { ok: true, compacted: false };
@@ -1514,7 +1523,10 @@ If your engine does **not** own the compaction algorithm, keep `compact()`
 implemented and delegate it explicitly:
 
 ```ts
-import { delegateCompactionToRuntime } from "openclaw/plugin-sdk/core";
+import {
+  buildMemorySystemPromptAddition,
+  delegateCompactionToRuntime,
+} from "openclaw/plugin-sdk/core";
 
 export default function (api) {
   api.registerContextEngine("my-memory-engine", () => ({
@@ -1526,8 +1538,15 @@ export default function (api) {
     async ingest() {
       return { ingested: true };
     },
-    async assemble({ messages }) {
-      return { messages, estimatedTokens: 0 };
+    async assemble({ messages, availableTools, citationsMode }) {
+      return {
+        messages,
+        estimatedTokens: 0,
+        systemPromptAddition: buildMemorySystemPromptAddition({
+          availableTools: availableTools ?? new Set(),
+          citationsMode,
+        }),
+      };
     },
     async compact(params) {
       return await delegateCompactionToRuntime(params);
diff --git a/docs/plugins/sdk-overview.md b/docs/plugins/sdk-overview.md
index 0ccaff887..cf8e0044f 100644
--- a/docs/plugins/sdk-overview.md
+++ b/docs/plugins/sdk-overview.md
@@ -386,6 +386,7 @@ AI CLI backend such as `codex-cli`.
 | Method                                     | What it registers                     |
 | ------------------------------------------ | ------------------------------------- |
 | `api.registerContextEngine(id, factory)`   | Context engine (one active at a time) |
+| `api.registerMemoryCapability(capability)` | Unified memory capability             |
 | `api.registerMemoryPromptSection(builder)` | Memory prompt section builder         |
 | `api.registerMemoryFlushPlan(resolver)`    | Memory flush plan resolver            |
 | `api.registerMemoryRuntime(runtime)`       | Memory runtime adapter                |
@@ -396,8 +397,13 @@ AI CLI backend such as `codex-cli`.
 | ---------------------------------------------- | ---------------------------------------------- |
 | `api.registerMemoryEmbeddingProvider(adapter)` | Memory embedding adapter for the active plugin |
 
+- `registerMemoryCapability` is the preferred exclusive memory-plugin API.
+- `registerMemoryCapability` may also expose `publicArtifacts.listArtifacts(...)`
+  so companion plugins can consume exported memory artifacts through
+  `openclaw/plugin-sdk/memory-host-core` instead of reaching into a specific
+  memory plugin's private layout.
 - `registerMemoryPromptSection`, `registerMemoryFlushPlan`, and
-  `registerMemoryRuntime` are exclusive to memory plugins.
+  `registerMemoryRuntime` are legacy-compatible exclusive memory-plugin APIs.
 - `registerMemoryEmbeddingProvider` lets the active memory plugin register one
   or more embedding adapter ids (for example `openai`, `gemini`, or a custom
   plugin-defined id).