elizaOS

The @vectorize-io/hindsight-eliza package gives elizaOS agents long-term memory backed by Hindsight.

It registers two components on your agent:

• A provider (HINDSIGHT_MEMORY) that recalls relevant memories and injects them into the prompt before each model call.
• An evaluator (HINDSIGHT_RETAIN) that retains conversation messages to Hindsight after each turn.

Both are enabled by default, layer on top of elizaOS's existing memory, and fail safe — a memory-service hiccup never blocks your agent from responding.

Installation

npm install @vectorize-io/hindsight-eliza @vectorize-io/hindsight-client

This package targets @elizaos/core ^1.7.2 (declared as a peer dependency).

Usage

Create the plugin and add it to your character's plugin list:

import { createHindsightPlugin } from "@vectorize-io/hindsight-eliza";
import { Hindsight } from "@vectorize-io/hindsight-client";

const hindsightPlugin = createHindsightPlugin({
  client: new Hindsight({ apiKey: process.env.HINDSIGHT_API_KEY }),
  recall: { budget: "high", includeEntities: true },
  retain: { tags: ["source:eliza"] },
});

export const character = {
  name: "Ada",
  plugins: [
    // ...your other plugins
    hindsightPlugin,
  ],
};

By default each agent message is stored under a memory bank keyed by the message's entityId, giving every user an isolated memory store.

Configuration

createHindsightPlugin({
  client,

  // Which memory bank to read/write. A string uses one fixed bank for all
  // messages; a function derives the bank per message. Defaults to
  // `message.entityId` (one bank per user).
  bank: (message) => message.entityId,

  recall: {
    enabled: true,            // set false to disable recall
    budget: "mid",            // "low" | "mid" | "high" — latency vs. depth
    types: ["world", "experience"], // restrict to fact types
    maxTokens: 1000,          // cap recalled tokens
    includeEntities: false,   // include entity observations
    heading: "# Relevant long-term memories", // prompt heading
  },

  retain: {
    enabled: true,            // set false to disable retain
    async: true,              // fire-and-forget; never adds turn latency
    tags: ["source:eliza"],   // tags on every retained memory
    metadata: { env: "prod" },
    includeAgentMessages: false, // also store the agent's own replies
  },
});

Using only recall or only retain

Disable either side with recall.enabled: false or retain.enabled: false. You can also build the components directly with createHindsightProvider and createHindsightEvaluator if you want to wire them into a plugin yourself.

How it works

Component	elizaOS seam	When it runs	What it does
HINDSIGHT_MEMORY	Provider	During prompt composition, before the model call	Calls Hindsight recall with the incoming message and injects the results into context
HINDSIGHT_RETAIN	Evaluator	After the agent processes the turn	Calls Hindsight retain to persist the message (and optionally the agent's replies)