Vigil — Cognitive Infrastructure for AI Agents

Created By

Alex LaGuardiaa month ago

A nervous system for AI agents — awareness daemon, frame-based tool filtering, signal protocol, session handoff, and event triggers. 14 modules, 268 tests, zero dependencies. MCP server with stdio and SSE transports.

# ai-agents

# awareness

Overview Content Tools Comments

Overview

Vigil — Cognitive Infrastructure for AI Agents

A nervous system for AI agents. Not another memory store — Vigil coordinates awareness across agents and sessions.

The Problem

Agents forget everything between sessions — every conversation starts cold
Loading all tools into context wastes 50K+ tokens before useful work begins
Multiple agents can't coordinate without being in the same process

Key Features

Awareness Daemon — compiles system state every 90s into hot context. Agents boot with full awareness in <1 second
Frame-Based Tool Filtering — tag tools with context modes. Backend mode sees 14 tools, not 95. Saves 75-85% of tokens
Signal Protocol — lightweight event bus with content budgets (300-800 chars). Agents coordinate without direct communication
Session Handoff — structured summaries (files, decisions, blockers, next steps). Handoff chains track continuity
Knowledge Auto-Extract — daemon identifies recurring patterns in signals and suggests persistent knowledge entries
Event Triggers — pattern-match on signals and fire webhooks, Slack alerts, focus items, or log entries
MCP Server — 12 tools over stdio or SSE. Works with Claude Code, Cursor, Claude Desktop, Windsurf

Quick Start

pip install vigil-agent
vigil quickstart
vigil serve --transport stdio

Stats

14 modules, 7,500+ lines, 268 tests
Zero dependencies beyond stdlib (MCP is optional)
SQLite storage, zero infrastructure
MIT license

Integrations

Claude Code, Cursor, Claude Desktop, GitHub Actions, Slack, Discord

Server Config

{
  "mcpServers": {
    "vigil": {
      "command": "vigil",
      "args": [
        "serve",
        "--transport",
        "stdio"
      ]
    }
  }
}

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