Dan Barr

Senior Technical Marketing Engineer

Dan Barr is a Senior Technical Marketing Engineer and the primary architect of Stacklok's top-notch docs, tutorials, how-to guides and more that help customers and users navigate all things MCP. Prior to Stacklok, Dan was a Technical Product Marketing Manager at Hashicorp, and a Cloud Architect for Penn State University. Dan's hands-on experience as an end user positions him to craft clear technical materials for Stacklok's audience.

All Articles by Dan Barr

May 13, 2026

Optimizing multi-MCP workflows

Managing dozens of MCP servers at scale creates real costs. Learn how a layered gateway, optimizer, and composite tools keep complexity under control.

May 11, 2026

MCP server governance starts with discovery

When MCP server URLs live in Slack threads, nobody knows what’s approved. See how Stacklok’s Registry Server solves discovery and access control at scale.

May 07, 2026

Enforcing MCP tool annotation policies with Cedar

MCP tool annotations declare what a tool does. Here’s how to enforce Cedar policies against those declarations using Stacklok’s ToolHive Kubernetes operator.

May 05, 2026

How to evaluate MCP runtimes against the OWASP Top 10

The OWASP MCP Top 10 reads like ten distinct problems, and most coverage treats them that way: ten boxes to check, ten features to ship. Token mismanagement, tool poisoning, and …

December 11, 2025

Introducing Virtual MCP Server: Unified gateway for multi-MCP workflows

Aggregate multiple MCP servers into single endpoint with vMCP with integrated tool filtering, multi-system workflows, and centralized authentication.

October 28, 2025

Cut token waste from AI workflows with the ToolHive MCP Optimizer

MCP Optimizer uses smart tool selection to reduce token usage by 85%. Give your context window a break by loading relevant tools only when they’re needed.

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