ContextVeil Tool Strips Secrets from AI Coding Agents Before They Reach the Model

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A developer has released ContextVeil, a free, open-source, locally-run tool designed to prevent coding agents like Claude Code from receiving sensitive credentials in their model context. The tool works by intercepting file reads — such as .env files — and replacing selected secret values with blank strings before the output reaches the AI model. During setup, heuristics scan environment variables and config files to suggest likely secrets, which the user then reviews and selects for protection. Matching is exact and deterministic, requires no network connection, and stores references to credential locations rather than copies of the values themselves. ContextVeil currently supports Linux and macOS, with Claude Code as its primary integration and experimental support for Codex CLI, GitHub Copilot CLI, and OpenCode.

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