The Agent Programming
Language
Define agents in a declarative language. Compile to TypeScript, Python, or Go. Edit with full LSP support in VSCode, Vim, and Neovim.
✓ Created research-assistant.sag
✓ Configured MCP servers
✓ LSP ready - open in your editor
✓ Run: sag compile --target typescript
Visual Agent Builder
Design multi-agent workflows visually. Click nodes, switch tabs, and run the simulation.
Agents as First-Class Citizens
A purpose-built language for defining intelligent agents. Protocol primitives, model abstraction, and workflow constructs built right in.
Declarative Syntax
Define agents in clean, YAML-like syntax. Focus on what your agent does, not the boilerplate. Native constructs for MCP, A2A, and AG-UI protocols.
Multi-Target Compilation
Write once, compile to TypeScript, Python, or Go. Your agent definitions become production-ready code in whatever language your team uses.
LSP-Powered Editing
Full Language Server Protocol support. Autocompletion, hover docs, diagnostics, and refactoring in VSCode, Vim, Neovim, and any LSP-compatible editor.
Write .sag, compile to anything
Define agents in a clean, declarative syntax. Compile to TypeScript, Python, or Go with a single command.
agent: research_assistant
version: 1.0
model:
provider: anthropic
name: claude-sonnet-4
context_window: 128000
protocols:
mcp:
servers: [brave_search, filesystem]
a2a:
discoverable: true
capabilities: [research, summarize]
ag_ui:
stream_events: true
tools:
- name: web_search
mcp_server: brave_search
description: "Search the web for information"
workflow:
- perceive: { from: trigger.user_input }
- reason: { depth: 3, strategy: chain_of_thought }
- execute: { tools: [web_search] }
- respond: { format: markdown, stream: true }import { Agent, MCPServer } from "@sagesyn/runtime-ts";
const braveSearch = new MCPServer("brave_search");
const filesystem = new MCPServer("filesystem");
export const researchAssistant = new Agent({
name: "research_assistant",
model: {
provider: "anthropic",
name: "claude-sonnet-4",
contextWindow: 128000,
},
protocols: {
mcp: { servers: [braveSearch, filesystem] },
a2a: { discoverable: true, capabilities: ["research", "summarize"] },
agUi: { streamEvents: true },
},
tools: [
{ name: "web_search", mcpServer: braveSearch },
],
workflow: [
{ perceive: { from: "trigger.user_input" } },
{ reason: { depth: 3, strategy: "chain_of_thought" } },
{ execute: { tools: ["web_search"] } },
{ respond: { format: "markdown", stream: true } },
],
});Compile, check, run
The sagesyn CLI compiles your .sag files to production code, validates with the LSP, and runs agents directly. Full debugging with source maps.
- Compile to TypeScript, Python, or Go
- LSP diagnostics from the command line
- Run agents locally or in the cloud
- Debug with source maps back to .sag
Start writing .sag today
Define agents in a declarative language. Compile to any target. Get early access to the compiler, LSP, and visual IDE.
Questions? [email protected]