Eidentic is the open-source TypeScript SDK for AI agents with self-improving memory and production fundamentals built in. Durable execution, enforced cost ceilings, multi-tenant isolation, GDPR erasure, and sandboxed tools — not bolted on. Apache-2.0, no enterprise gating. Runs on Node, Bun, Deno, and the edge.

Status: 0.x — APIs stabilizing toward v1; see STABILITY. We'd rather over-disclose gaps than oversell — see the benchmarks for honest, reproducible numbers.

import { Agent, AIModel, SqliteStore } from "eidentic";
import { anthropic } from "@ai-sdk/anthropic";

const agent = new Agent({
  id: "support",
  model: new AIModel(anthropic("claude-sonnet-4-5")),
  store: new SqliteStore("./eidentic.sqlite"),
});

for await (const ev of agent.query("What did we decide last week?", { sessionId: "u-42" })) {
  console.log(ev);
}

Why Eidentic?

Most agent frameworks lead one lane — memory, or coding/sandbox, or DX, or durable orchestration, or skills. Rarely do all of these ship together, and production-readiness is usually behind an enterprise tier. Eidentic's thesis: everything in one composable, fully-open package.

1. Memory that improves itself. Not just vector recall — a four-tier engine with self-editing memory blocks, a temporal knowledge graph (facts with validity over time; contradictions invalidate rather than accumulate), sleep-time consolidation, and passive fact extraction. (design spec)

2. Production fundamentals, built in — not bolted on. Durable checkpoint/resume with exactly-once tool dispatch, enforced cost ceilings ($/token/turn) with per-turn cost visibility, built-in rate-limiting + quotas, OpenTelemetry GenAI spans, a structured audit-event stream (permission denials, quota/rate-limit rejections, auth failures, and right-to-erasure — the events a compliance log needs), deny-by-default permissions, sandboxed code/command execution, secrets the model never sees, and one-call right-to-erasure (GDPR) that fans out across every store. For offline workloads there's a batch runner and scheduled/background runs. And because shipping an agent without tests is shipping blind, there's a built-in eval harness with a CI pass-rate gate plus one-call promotion of a production trace into a regression test — every incident becomes a test, not a repeat. Several of these are unique or near-unique among open frameworks.

3. Composable, fully open, runs everywhere. Ports-and-adapters architecture: swap the store (SQLite / libSQL / Postgres), vector backend (LanceDB / pgvector / Qdrant / Pinecone), or embedder without touching agent code. Ingest PDF, HTML, and Markdown out of the box; interop via MCP (with OAuth) and A2A. Apache-2.0, no code-gating. Verified on Node, Bun, and Deno in CI.

Two ways to use Eidentic

Eidentic is a library first. You don't have to run a separate service — you import it straight into your own backend and call agent.query(). Running it as a standalone HTTP service is an optional second mode for when you want agents-as-a-service.

1. Embedded — drop it into your app (the common path)

One install, then construct an agent and stream it from any request handler. The agent runs server-side (it holds your model key); your frontend just calls your endpoint.

npm install eidentic ai @ai-sdk/anthropic

Next.js (App Router) — app/api/chat/route.ts:

Next.js / serverless: use @eidentic/libsql (pure-JS, bundler-friendly), not SqliteStore. The native better-sqlite3 addon behind SqliteStore doesn't bundle under Next/Turbopack (Dynamic require not supported). npm install @eidentic/libsql and keep the route on the Node runtime. (For Node servers/scripts, SqliteStore is great — see the snippet at the top.)

import { Agent, AIModel } from "eidentic";
import { LibsqlStore } from "@eidentic/libsql";
import { anthropic } from "@ai-sdk/anthropic";

export const runtime = "nodejs"; // native/edge-safe store; not the edge runtime

const agent = new Agent({
  id: "support",
  model: new AIModel(anthropic("claude-sonnet-4-5")),
  store: new LibsqlStore("file:eidentic.db"),
});

export async function POST(req: Request) {
  const { message, sessionId } = await req.json();
  const stream = new ReadableStream({
    async start(c) {
      for await (const ev of agent.query(message, { sessionId, signal: req.signal }))
        c.enqueue(new TextEncoder().encode(JSON.stringify(ev) + "\n"));
      c.close();
    },
  });
  return new Response(stream, { headers: { "content-type": "application/x-ndjson" } });
}

Express:

app.post("/chat", async (req, res) => {
  res.type("application/x-ndjson");
  const controller = new AbortController();
  res.on("close", () => { if (!res.writableEnded) controller.abort(); });
  for await (const ev of agent.query(req.body.message, { sessionId: req.body.sessionId, signal: controller.signal }))
    res.write(JSON.stringify(ev) + "\n");
  res.end();
});

Cloudflare Workers / edge — same Agent, swap the store for a libSQL/Postgres adapter:

export default {
  async fetch(req: Request) {
    const { message, sessionId } = await req.json();
    const stream = new ReadableStream({
      async start(c) {
        for await (const ev of agent.query(message, { sessionId, signal: req.signal }))
          c.enqueue(new TextEncoder().encode(JSON.stringify(ev) + "\n"));
        c.close();
      },
    });
    return new Response(stream, { headers: { "content-type": "application/x-ndjson" } });
  },
};

A complete, runnable version (plain node:http, no extra packages) is in examples/hello-embedded.ts — pnpm --filter eidentic-examples hello:embedded.

2. Server — agents-as-a-service (optional)

When you'd rather not hand-write the endpoint, or want a dedicated multi-tenant agent backend with auth, sessions, and streaming out of the box, @eidentic/server gives you a ready Hono app:

import { createServer, serveNode, ApiKeyAuth } from "@eidentic/server";

const app = createServer({
  agents: { support: agent },
  auth: ApiKeyAuth({ key_live_123: { userId: "u1" } }),
});
await serveNode(app, { port: 3000 }); // POST /v1/agents/support/query → SSE

Or scaffold a project and boot it in dev:

npm create eidentic@latest my-agent
cd my-agent && eidentic dev   # loads eidentic.config.ts and serves it

What's in the box

Every feature ships a runnable examples/hello-*.ts (most use a mock model, so no API key needed). See the feature tour for the full list and how to run each one.

Benchmarks

On two public long-term-memory benchmarks, Eidentic's retrieval-based memory beats the full-context baseline — at a fraction of the tokens. Same script, same models, same seed, full splits, full-context baseline included. Honest caveats and the per-category gaps where memory loses are published alongside.

The larger the history, the more memory wins: stuffing ~115k tokens into the context window buries the evidence among distractors, while targeted retrieval surfaces it. Methodology, configuration, and reproduction commands: docs/BENCHMARKS.md.

Example apps

Clonable, runnable starter apps — a memory-backed chat agent in each framework. Add an API key and npm run dev:

• example-nextjs — Next.js App Router + withEidentic handler + useChat
• example-react — Vite + React hooks (useEidenticStream) against an Eidentic server
• example-express — drop the Agent into a plain Express route and stream over SSE

Quickstart (from this repo)

pnpm install
pnpm -r build
pnpm --filter eidentic-examples hello          # mock model — no API key needed

Run against a real model or stream tokens live:

export ANTHROPIC_API_KEY=sk-ant-...
pnpm --filter eidentic-examples hello:real
pnpm --filter eidentic-examples hello:stream

Debugging

Set DEBUG=eidentic:* for verbose, namespaced loop logs (model calls, tool dispatch, memory recall, compaction, cost) with secret values redacted. Scope it (DEBUG=eidentic:tool,eidentic:cost) to focus. It's the fastest way to see what an agent actually did when something looks off.

DEBUG=eidentic:* pnpm --filter eidentic-examples hello

Package layout

The eidentic umbrella package bundles core, types, model, sqlite, and memory — one install for the common case. All 32 packages are in this monorepo; optional adapters are separate installs so you only pay for what you use. This keeps cold-start footprint small and avoids pulling in native addons you don't need.

npm install eidentic gives you the core stack. Optional packages — server, React hooks, vector stores, sandbox — are separate installs by design. See the table above.

Production checklist

A few defaults are safe for local development but need attention before going public:

• Studio defaults to NoAuth. serveStudio and createStudioApi expose full read/write access to agent memory and session traces. Never bind Studio to a publicly reachable address without configuring ApiKeyAuth (or a custom AuthPort). It is strictly a dev tool.
• @eidentic/server also defaults to NoAuth. Add ApiKeyAuth (or your own AuthPort) before deploying. Combine with your load-balancer's rate-limiting or use the built-in quota/rate-limit options — the server has no default cap on request volume.
• SkillBank and executable skills. If you allow agent-authored or user-submitted skills, set requireSigned: true so only ed25519-signed bundles are accepted. The default quarantine gate helps, but signed skills are the recommended production posture.
• Langfuse / observability. If you use @eidentic/langfuse, pass redactAttributes to strip PII or secrets from span attributes before they leave your network. The default records all tool inputs and outputs verbatim.

Docs

• Deployment guide — Node, Docker, edge, Next.js, scaling & ops
• Benchmarks — methodology and reproducible numbers
• Runtime support matrix — Node / Bun / Deno / edge
• Feature tour — run every feature locally
• Design spec — the full architecture
• Stability policy — versioning contract, stability tiers, conformance-suite promise
• Full docs — guides, API reference, and examples (source)

Use the docs with your AI tools

Point your AI coding agent at Eidentic and it answers from the real, current docs:

• MCP (Cursor, Claude Code, Windsurf): add the auto-generated server — https://gitmcp.io/eidentic/eidentic
• Context7: write use context7 in your prompt; the docs are indexed there.
• llms.txt: docs.eidentic.dev/llms.txt (index) · llms-full.txt (full text)
• Every docs page has Copy page / Open in ChatGPT / Claude / Perplexity actions.

License

Apache-2.0.