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Sandcastle

Tell your computer what to do. In any language.

Sandcastle is an open-source AI workflow orchestrator that turns natural language instructions into production-grade automated workflows. Write what you need in plain Czech, English, Japanese - any language - and Sandcastle builds, runs, and monitors it for you.

No drag-and-drop. No flowchart editors. Just describe what you want and let AI agents handle the rest.

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What makes Sandcastle different

Feature	Sandcastle	Legacy RPA / No-code
Input	Natural language (any language)	Visual flowcharts, scripted macros
Execution	AI agents in sandboxed environments	Deterministic scripts
Connectors	56 built-in, any API via code step	Limited vendor integrations
Scaling	Parallel fan-out, edge execution	Sequential, single-machine
Control	YAML for precision, NL for speed	One paradigm only
Learning	Agent memory, cost optimization	Static playbooks

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By the numbers

Metric	Value
Codebase	~89,000 lines of code
Templates	236 (118 built-in + 118 community)
Connectors	56 tools across 9 categories
Step types	15 (from simple LLM calls to parallel races)
API endpoints	84 REST endpoints
Dashboard pages	20 full-featured pages
CLI commands	27 top-level commands
Tests	1,463 test functions across 57 files
Protocols	A2A, AG-UI, MCP
Sandbox backends	4 (E2B, Docker, Local, Cloudflare)
Model providers	7 models across 4 providers

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Quick start

pip install sandcastle-ai
sandcastle init          # interactive setup wizard
sandcastle serve         # start everything on localhost:8080

Open http://localhost:8080 and you have a full dashboard with workflow builder, template gallery, run monitoring, scheduling, approvals, and more.

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Wiki contents

• Origin Story - Why we built Sandcastle and how it evolved
• Architecture - System design, modules, and data flow
• Features - Complete feature reference
• Step Types - All 15 workflow step types explained
• Integrations - 56 connectors across 9 categories
• Dashboard - 20-page React dashboard walkthrough
• CLI Reference - All 27 commands
• Security - Security architecture and hardening
• Community Hub - 118 community templates, 18 collections
• Protocols - A2A, AG-UI, and MCP support
• By The Numbers - Comprehensive project statistics

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License: BSL-1.1 | PyPI: sandcastle-ai | Version: 0.17.0