diff --git a/src/handlers/posts.ts b/src/handlers/posts.ts
index 56cf3f2..6c90137 100644
--- a/src/handlers/posts.ts
+++ b/src/handlers/posts.ts
@@ -83,6 +83,7 @@ ${parsedThread}`,
 
             const functionResponse = await tools.handler(
                 call as typeof call & { name: SupportedFunctionCall },
+                post.author.did,
             );
 
             logger.log("Function response:", functionResponse);
diff --git a/src/tools/add_to_memory.ts b/src/tools/add_to_memory.ts
new file mode 100644
index 0000000..4fd3311
--- /dev/null
+++ b/src/tools/add_to_memory.ts
@@ -0,0 +1,65 @@
+import { Type } from "@google/genai";
+import { MemoryHandler } from "../utils/memory";
+import z from "zod";
+
+export const definition = {
+  name: "add_to_memory",
+  description: "Adds or updates an entry in a user's memory block.",
+  parameters: {
+    type: Type.OBJECT,
+    properties: {
+      label: {
+        type: Type.STRING,
+        description: "The key or label for the memory entry.",
+      },
+      value: {
+        type: Type.STRING,
+        description: "The value to be stored.",
+      },
+      block: {
+        type: Type.STRING,
+        description: "The name of the memory block to add to. Defaults to 'memory'.",
+      },
+    },
+    required: ["label", "value"],
+  },
+};
+
+export const validator = z.object({
+  label: z.string(),
+  value: z.string(),
+  block: z.string().optional().default("memory"),
+});
+
+export async function handler(
+  args: z.infer<typeof validator>,
+  did: string,
+) {
+  const userMemory = new MemoryHandler(
+    did,
+    await MemoryHandler.getBlocks(did),
+  );
+
+  const blockHandler = userMemory.getBlockByName(args.block);
+
+  if (!blockHandler) {
+    return {
+      success: false,
+      message: `Memory block with name '${args.block}' not found.`,
+    };
+  }
+
+  if (!blockHandler.block.mutable) {
+    return {
+      success: false,
+      message: `Memory block '${args.block}' is not mutable.`,
+    };
+  }
+
+  await blockHandler.createEntry(args.label, args.value);
+
+  return {
+    success: true,
+    message: `Entry with label '${args.label}' has been added to the '${args.block}' memory block.`,
+  };
+}
diff --git a/src/tools/create_blog_post.ts b/src/tools/create_blog_post.ts
index 3ac477e..4409217 100644
--- a/src/tools/create_blog_post.ts
+++ b/src/tools/create_blog_post.ts
@@ -28,7 +28,10 @@ export const validator = z.object({
   content: z.string(),
 });
 
-export async function handler(args: z.infer<typeof validator>) {
+export async function handler(
+  args: z.infer<typeof validator>,
+  did: string,
+) {
   //@ts-ignore: NSID is valid
   const entry = await bot.createRecord("com.whtwnd.blog.entry", {
     $type: "com.whtwnd.blog.entry",
diff --git a/src/tools/create_post.ts b/src/tools/create_post.ts
index 015a12c..d548894 100644
--- a/src/tools/create_post.ts
+++ b/src/tools/create_post.ts
@@ -25,7 +25,10 @@ export const validator = z.object({
   text: z.string(),
 });
 
-export async function handler(args: z.infer<typeof validator>) {
+export async function handler(
+  args: z.infer<typeof validator>,
+  did: string,
+) {
   let uri: string | null = null;
   if (exceedsGraphemes(args.text)) {
     uri = await multipartResponse(args.text);
diff --git a/src/tools/index.ts b/src/tools/index.ts
index 9169147..bc8e06f 100644
--- a/src/tools/index.ts
+++ b/src/tools/index.ts
@@ -1,4 +1,5 @@
 import type { FunctionCall, GenerateContentConfig } from "@google/genai";
+import * as add_to_memory from "./add_to_memory";
 import * as create_blog_post from "./create_blog_post";
 import * as create_post from "./create_post";
 import * as mute_thread from "./mute_thread";
@@ -8,6 +9,7 @@ const validation_mappings = {
   "create_post": create_post.validator,
   "create_blog_post": create_blog_post.validator,
   "mute_thread": mute_thread.validator,
+  "add_to_memory": add_to_memory.validator,
 } as const;
 
 export const declarations = [
@@ -16,26 +18,38 @@ export const declarations = [
       create_post.definition,
       create_blog_post.definition,
       mute_thread.definition,
+      add_to_memory.definition,
     ],
   },
 ];
 
 type ToolName = keyof typeof validation_mappings;
-export async function handler(call: FunctionCall & { name: ToolName }) {
+export async function handler(
+  call: FunctionCall & { name: ToolName },
+  did: string,
+) {
   const parsedArgs = validation_mappings[call.name].parse(call.args);
 
   switch (call.name) {
     case "create_post":
       return await create_post.handler(
         parsedArgs as z_infer<typeof create_post.validator>,
+        did,
       );
     case "create_blog_post":
       return await create_blog_post.handler(
         parsedArgs as z_infer<typeof create_blog_post.validator>,
+        did,
       );
     case "mute_thread":
       return await mute_thread.handler(
         parsedArgs as z_infer<typeof mute_thread.validator>,
+        did,
+      );
+    case "add_to_memory":
+      return await add_to_memory.handler(
+        parsedArgs as z_infer<typeof add_to_memory.validator>,
+        did,
       );
   }
 }
diff --git a/src/tools/mute_thread.ts b/src/tools/mute_thread.ts
index 35228b8..673b2bf 100644
--- a/src/tools/mute_thread.ts
+++ b/src/tools/mute_thread.ts
@@ -25,7 +25,10 @@ export const validator = z.object({
   uri: z.string(),
 });
 
-export async function handler(args: z.infer<typeof validator>) {
+export async function handler(
+  args: z.infer<typeof validator>,
+  did: string,
+) {
   //@ts-ignore: NSID is valid
   const record = await bot.createRecord("dev.indexx.echo.threadmute", {
     $type: "dev.indexx.echo.threadmute",
diff --git a/src/utils/memory.ts b/src/utils/memory.ts
index 25b9214..9929c50 100644
--- a/src/utils/memory.ts
+++ b/src/utils/memory.ts
@@ -94,6 +94,10 @@ export class MemoryHandler {
       })),
     }));
   }
+
+  public getBlockByName(name: string) {
+    return this.blocks.find((handler) => handler.block.name === name);
+  }
 }
 
 export class MemoryBlockHandler {