Context Fence

Context Fence enhances the security of coding agents by acting as a local policy proxy. Key features include: • Real-time schema-based tool call validation • Automatic stripping of sensitive information • Append-only local audit logs • Zero cloud routing for all agent traffic • Sub-10ms response times for policy checks This robust proxy sits directly on your machine, intercepting all communications between your coding agent and its MCP (Model Control Protocol) tools. Unlike cloud-based security solutions, Context Fence ensures that no agent activity or sensitive data ever leaves your local environment, effectively preventing data exfiltration incidents. Every tool call is rigorously checked against predefined rules, blocking any risky or unauthorized actions before they can impact your system. Context Fence is engineered for speed and privacy, performing all policy checks within milliseconds using schema validation rather than resource-intensive judgment processes. This design guarantees that security measures do not impede development velocity. The comprehensive audit log provides an immutable record of all agent interactions, crucial for compliance and post-incident analysis. It specifically addresses the vulnerabilities where agents might unintentionally access and transmit confidential data, such as environment variables or API keys. Ideal for software developers, security-conscious engineering teams, and organizations handling sensitive codebases, Context Fence offers a critical layer of protection for local development environments. It provides peace of mind by ensuring that coding agents operate strictly within defined boundaries, maintaining data integrity and preventing accidental data leaks.