Context Fence
Runtime firewall for AI coding agents.
Context Fence launched on August 30, 2026 with 8 votes, #1,241 of 23,274 launches that month and more than 90% of that year's launches.
What it does
Local security proxy for AI coding agents. Sit between agent and MCP servers, check every tool call against your rules, block risky ones, log everything for audit.
Context Fence is a local firewall for what AI agents send out. It checks data before it leaves your machine and blocks secrets. Today it protects MCP tools. Version 2.1 is coming.
An agent will open the file you never wanted it to touch. We put a local check in that gap — every call validated before it runs, at schema speed. On July 18, a coding agent read a .env file it was never asked to open. The keys left the machine. AI agents often hold real secrets, like keys and passwords. Nobody sees what they do with them. You find out later, if at all. Most teams just trust the agent. The fence checks first. Most teams just trust the agent. The fence checks first. What your agent sends out, checked on your machine. No cloud in the path. Strips keys and tokens from what agents read. If it looks like a secret, it does not pass. Checks every MCP tool call before it runs.…from contextfence.dev
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