Context Fence
Runtime firewall for AI coding agents.
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 MCP policy proxy for AI coding agents: schema-based checks under 10ms, secret stripping, append-only audit log, zero cloud routing.
Context Fence sits between your AI agent and its MCP tools on your own machine. Every action a schema check, not an LLM judge, so it stays under 10ms. Nothing leaves your machine. That is the point. The July 18 incident — what happened, why the usual fix doesn't fix it, and where the guard actually lives. On July 18, a coding agent read the .env file it was never asked to open, then sent what it had read across the wire. The keys left the machine inside an API payload. The usual fix — a cloud gateway and a vendor's deny-list — would have hoped for the best: every call leaves your machine first. Ours doesn't. The guard lives where the agent lives: a gate at the boundary. Nothing leaves.…from contextfence.dev
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