Synaptic

A Deno-first framework for building AI agents as composable circuits with strong typing, Everything-as-Code (EaC), and a fluent builder API.

Synaptic helps you go beyond “just chat” by wiring prompt-driven neurons, tools, memory, and state into repeatable circuits you can run across runtimes.

Status: early preview – APIs may change.

Why Synaptic

• Strong typing: author circuits, state, and resources in TypeScript.
• Fluent builders: compose neurons and circuits without brittle JSON.
• Everything-as-Code (EaC): produce portable artifacts you can run anywhere.
• Deno-first: clean imports, npm interop, and zero build steps.
• Extensible: add tools, personalities, retrievers, vector stores, and more.

Quick Start (Fluent API)

Define a minimal linear circuit with two prompt neurons:

// deno run -A quick-start.ts
import {
  ChatPromptNeuronBuilder,
  LinearCircuitBuilder,
} from "jsr:@fathym/synaptic/fluent";

// A prep step that summarizes input
const prep = new ChatPromptNeuronBuilder("prep", {
  Instructions: ["Summarize the user input in one short sentence."],
  Messages: [{ role: "user", content: "{input}" }],
});

// The final agent step with a distinct style
const agent = new ChatPromptNeuronBuilder("agent", {
  Instructions: ["Answer like a pirate. Keep it concise."],
});

// Chain prep -> agent into a Linear circuit
const circuit = new LinearCircuitBuilder()
  .Neuron(prep)
  .Neuron(agent)
  .Chain(prep, agent)
  .Build();

// Export as an EaC fragment you can load into a runtime
export const eac = {
  Circuits: {
    "quick-start": { Details: circuit },
  },
};

Next steps:

• Read the Fluent Quick Start for concepts and patterns.
• See the Migration Guide to convert JSON circuits.

Features

• Fluent circuit builders: LinearCircuitBuilder, GraphCircuitBuilder.
• Prompt neurons: ChatPromptNeuronBuilder, tool integration, and more.
• Resource builders: personalities, embeddings, retrievers, vector stores, etc.
• Typed state: build, validate, and evolve circuit state safely.
• Portable EaC output: commit and deploy circuits as code.

Install

Use Synaptic directly from JSR in Deno:

import { fluent } from "jsr:@fathym/synaptic";
// or import specific builders
import { LinearCircuitBuilder } from "jsr:@fathym/synaptic/fluent";

Project uses npm interop internally (e.g., LangGraph, Preact), which Deno resolves transparently.

Runtimes

This package focuses on modeling and building circuits. To execute circuits, use a compatible runtime. See runtime/README.md for notes and pointers.

Development

• Format: deno fmt
• Lint: deno lint
• Type check: deno check **/*.ts
• Full build: deno task build
• Tests: deno task test

Project Structure

• src/fluent/: fluent builders for circuits, neurons, state, and resources.
• src/eac/: Everything-as-Code types and validators.
• src/circuits/, src/runnables/, src/memory/: building blocks and utilities.
• docs/fluent/: quick start and migration guides.
• runtime/: notes for runtime packages that consume Synaptic.

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We welcome feedback and issues as the API stabilizes. If you’d like a deeper tour or have a feature request, please open an issue.