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Arc Relay
Open-source MCP control plane with per-user tool permissions
Your MCP server gives every agent access to every tool. The workarounds - enterprise contracts, YAML policy files, PowerShell - they weren't built for mixed teams. Arc Relay is the missing layer: per-user, per-tool access control in a web UI. PII gets stripped before it leaves your environment. Every call is logged. Runs in Docker, starts in one command, no config files required. MIT licensed, built in Go.
Hey PH!
We built Arc Relay because we needed it ourselves.
I've been in fintech and compliance since 2008 - been at this since LAN parties and dial-up. I thought I understood how fast software could move. This is the first time I've had to build guardrails before I could build features.
Comma Compliance is a remote team - engineers, marketing, sales, ops - all running AI tools connected to real company systems via MCP. The problem: one MCP server, everyone gets everything.
Our marketing person uses Webflow MCP constantly. She doesn't need to touch the codebase. Our devs don't need the CRM. Everyone can read Otter meeting notes, but not everyone should be able to edit them.
Same problem at home. I run Unraid - home automation, networking, the whole stack. Every agent still wants everything.
Every agent that connected got the full tool list with no simple way to scope it.
Turns out when you give everyone everything, everyone uses everything. I got so distracted I built a tool to fix it.
Arc Relay sits between your AI clients and your MCP servers. Per user, per tool, in a web UI. PII gets stripped before it leaves your environment. Every call is logged. Old habits.
Runs in Docker, one command, no config files required.
We open-sourced the capture layer for messaging compliance. The control layer felt like it should be no different. MIT, built in Go
If that's your situation - give it a try. Curious how other teams are handling MCP access control right now, and what integrations matter most.
-->https://github.com/comma-complia...
About Arc Relay on Product Hunt
“Open-source MCP control plane with per-user tool permissions”
Arc Relay was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #134 on the daily leaderboard. Your MCP server gives every agent access to every tool. The workarounds - enterprise contracts, YAML policy files, PowerShell - they weren't built for mixed teams. Arc Relay is the missing layer: per-user, per-tool access control in a web UI. PII gets stripped before it leaves your environment. Every call is logged. Runs in Docker, starts in one command, no config files required. MIT licensed, built in Go.
On the analytics side, Arc Relay competes within Developer Tools, Artificial Intelligence, GitHub and Security — topics that collectively have 1M followers on Product Hunt. The dashboard above tracks how Arc Relay performed against the three products that launched closest to it on the same day.
Who hunted Arc Relay?
Arc Relay was hunted by Jeremiah Church. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Arc Relay including community comment highlights and product details, visit the product overview.
Jeremiah Church