FrontmatterVersion: 1 DocumentType: Guide Title: Fathym Synaptic Summary: Deno-first micro-framework for building AI agents and circuits with fluent builders and Everything-as-Code output. Created: 2025-11-20 Updated: 2025-11-20 Owners:

• fathym References:
• Label: Micro-Frameworks README Path: ../README.md
• Label: Micro-Frameworks AGENTS Path: ../AGENTS.md
• Label: Micro-Frameworks GUIDE Path: ../GUIDE.md
• Label: Workspace README Path: ../../README.md
• Label: Workspace AGENTS Path: ../../AGENTS.md
• Label: Workspace GUIDE Path: ../../WORKSPACE_GUIDE.md
• Label: Project AGENTS Guide Path: ./AGENTS.md
• Label: Project GUIDE Path: ./GUIDE.md

Synaptic

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

• Goal: let you compose neurons, tools, memory, and state into repeatable circuits that run across runtimes.
• Outputs: fluent builders, EaC artifacts, examples, and supporting runtime notes.
• Status: early preview—APIs may change.

Why Synaptic

• Strong typing and fluent builders (circuits, neurons, resources).
• Everything-as-Code for portable artifacts.
• Deno-first with npm interop; extensible with tools, personalities, retrievers, vector stores.

Quick Start (Fluent API)

import {
  ChatPromptNeuronBuilder,
  LinearCircuitBuilder,
} from "jsr:@fathym/synaptic/fluent";

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

const agent = new ChatPromptNeuronBuilder("agent", {
  Instructions: ["Answer like a pirate. Keep it concise."],
});

const circuit = new LinearCircuitBuilder()
  .Neuron(prep)
  .Neuron(agent)
  .Chain(prep, agent)
  .Build();

export const eac = {
  Circuits: {
    "quick-start": { Details: circuit },
  },
};

See docs/fluent/quick-start.mdx and docs/fluent/migration-guide.mdx for more patterns.

Features

• Fluent circuit builders (LinearCircuitBuilder, GraphCircuitBuilder).
• Prompt neurons and agent neurons with tool calling.
• Resource builders (personalities, embeddings, retrievers, vector stores).
• Typed state and portable EaC output for runtimes.

Runtimes

This package models and builds circuits; use a compatible runtime to execute them (runtime/ contains notes and pointers).

Development

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

Project Structure

• src/fluent/: fluent builders for circuits, neurons, state, resources.
• src/eac/: Everything-as-Code types/validators.
• src/circuits/, src/runnables/, src/memory/: building blocks and utilities.
• docs/fluent/: quick start and migration guides.
• docs/reference/: builder references (circuits, neurons, tools, persistence, state, retrievers, vector stores).
• runtime/: notes for runtime packages consuming Synaptic.

We welcome feedback and issues as the API stabilizes.