Principal AI Engineer with 25+ years building production systems — now focused on agentic AI, multi-agent orchestration, and the Model Context Protocol (MCP). I build code-first agents with LangGraph, human-in-the-loop control, and real evaluation suites. Creator and maintainer of WebCalendar (1M+ downloads), and shipping open source since before the term existed (see the last bullet).

• scheduling-agent — a LangGraph agent that turns natural language ("set up a recurring standup, avoiding Fridays") into validated, RFC 5545-compliant calendar events on WebCalendar via MCP. Human-in-the-loop approval before every write (LangGraph interrupt + SQLite checkpointing + reject→replan), a 20-case RRULE/DST eval suite that gates CI, pluggable model providers (Anthropic, OpenRouter, or local via Ollama/LM Studio), and LangSmith tracing.
• agentic-dev-team — a self-hosted autonomous coding team. You describe what to build and approve the plan; a pipeline of AI agents (built on opencode) handles planning, coding, review, testing, and security checking end-to-end, coordinated through a self-hosted git forge, a real-time board, and per-run ephemeral Docker sandboxes.
• k5n-mcp-hub — a registry and management hub for MCP servers (Python/FastAPI): server discovery, health monitoring, request tracing, an MCP reverse proxy, and fault injection for chaos-testing how agents and clients handle slow, broken, and non-conforming servers.
• WebCalendar MCP server — exposes calendar operations (events, search, scheduling) to AI assistants over MCP.

• WebCalendar — PHP 8 LAMP multi-user calendar I created and maintain; 1M+ downloads, 30+ translations. Recently modernized the UI (Bootstrap/jQuery, replacing legacy Prototype.js) and rewrote the web-based installer for PHP 8.
• webcalendar-core — modern PHP 8.1+ Clean Architecture library (26 services, 17 repository interfaces, RFC 5545 iCalendar) that will power the next generation of WebCalendar.
• php-icalendar-core — RFC 5545-compliant iCalendar parser/writer for PHP 8.1+ with strict/lenient modes and recurrence support; also the correctness backbone behind scheduling-agent's RRULE/DST validation.

• ilibgo — Go image library with an X11-style API (a port of my C ilib) · Cliquetool — Go graph-clique tool · GTimer — Linux GTK time tracker.

• CVE Services — contributed to MITRE's CVE Program REST API (containerizing the Node.js app; also built the AWS CodePipeline CI/CD).

• Java Calendar Tools, k5nCal, Ilib

LinkedIn · k5n.us · craig AT k5n.us

Fun fact: my first open-source release was xapplaunch, a system menubar for HP-UX/SunOS/AIX/OSF-1, posted to a public FTP server in 1995 — three years before the term "open source" existed.