diff --git a/api/app/clients/tools/util/handleTools.js b/api/app/clients/tools/util/handleTools.js
index fd90f3f505..f9f0d92f18 100644
--- a/api/app/clients/tools/util/handleTools.js
+++ b/api/app/clients/tools/util/handleTools.js
@@ -85,6 +85,23 @@ async function isMemoryToolUsable(req, writePermissions = []) {
   }
 }
 
+/**
+ * Whether the agent actually declared the requested inline memory tool. The
+ * event-driven executor loads tools by requested name, so a hallucinated or
+ * undeclared `set_memory`/`delete_memory` call (e.g. on an agent that never
+ * opted into the memory capability) must not be constructed.
+ * @param {{ toolDefinitions?: Array<{ name?: string }>, tools?: Array<unknown> }} [agent]
+ * @param {string} toolName
+ * @returns {boolean}
+ */
+function agentDeclaredMemoryTool(agent, toolName) {
+  if (!agent) {
+    return false;
+  }
+  const declared = (entry) => (typeof entry === 'string' ? entry : entry?.name) === toolName;
+  return (agent.toolDefinitions ?? []).some(declared) || (agent.tools ?? []).some(declared);
+}
+
 /**
  * Validates the availability and authentication of tools for a user based on environment variables or user-specific plugin authentication values.
  * Tools without required authentication or with valid authentication are considered valid.
@@ -397,7 +414,10 @@ const loadTools = async ({
       const validKeys = memoryConfig?.validKeys;
       const tokenLimit = memoryConfig?.tokenLimit;
       requestedTools[tool] = async () => {
-        if (!(await isMemoryToolUsable(options.req, [Permissions.CREATE, Permissions.UPDATE]))) {
+        if (
+          !agentDeclaredMemoryTool(agent, SET_MEMORY_TOOL_NAME) ||
+          !(await isMemoryToolUsable(options.req, [Permissions.CREATE, Permissions.UPDATE]))
+        ) {
           return null;
         }
         let totalTokens = 0;
@@ -407,6 +427,9 @@ const loadTools = async ({
             totalTokens = formatted?.totalTokens ?? 0;
           } catch (error) {
             logger.error('[handleTools] Failed to load memory token count for set_memory', error);
+            /** Fail closed: without the current usage total a configured
+             *  tokenLimit could be silently bypassed. */
+            return null;
           }
         }
         return createMemoryTool({ userId: user, setMemory, validKeys, tokenLimit, totalTokens });
@@ -415,7 +438,10 @@ const loadTools = async ({
     } else if (tool === DELETE_MEMORY_TOOL_NAME) {
       const memoryConfig = options.req?.config?.memory;
       requestedTools[tool] = async () => {
-        if (!(await isMemoryToolUsable(options.req, [Permissions.UPDATE]))) {
+        if (
+          !agentDeclaredMemoryTool(agent, DELETE_MEMORY_TOOL_NAME) ||
+          !(await isMemoryToolUsable(options.req, [Permissions.UPDATE]))
+        ) {
           return null;
         }
         return createDeleteMemoryTool({
diff --git a/api/server/services/Endpoints/agents/initialize.js b/api/server/services/Endpoints/agents/initialize.js
index 7bda67c545..530901e691 100644
--- a/api/server/services/Endpoints/agents/initialize.js
+++ b/api/server/services/Endpoints/agents/initialize.js
@@ -153,9 +153,12 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
   const skillDbMethods = getSkillDbMethods();
 
   /** Run-level gate for inline memory tools: the `memory` capability must be
-   *  enabled, memory must be configured, and the user must not have opted out
-   *  or lost the `MEMORIES.USE` permission. Agents (or the ephemeral memory
-   *  badge) opt in per-agent via the `memory` marker on `tools`. */
+   *  enabled, memory must be configured, and the user must not have opted out.
+   *  Requires the memory WRITE permissions (CREATE + UPDATE) — both inline tools
+   *  mutate memory — so the tools aren't registered (and shown to the model) for
+   *  read-only-memory roles that the runtime loader would then refuse to build.
+   *  Agents (or the ephemeral memory badge) opt in per-agent via the `memory`
+   *  marker on `tools`. */
   const memoryAvailable =
     enabledCapabilities.has(AgentCapabilities.memory) &&
     isMemoryEnabled(appConfig?.memory) &&
@@ -163,7 +166,7 @@ const initializeClient = async ({ req, res, signal, endpointOption }) => {
     (await checkAccess({
       user: req.user,
       permissionType: PermissionTypes.MEMORIES,
-      permissions: [Permissions.USE],
+      permissions: [Permissions.USE, Permissions.CREATE, Permissions.UPDATE],
       getRoleByName: db.getRoleByName,
     }));