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Show HN: MicroCodex Coding Agent – OpenAI/codex reimplemented in C++
This provides a lightweight, locally-running alternative to the original Codex agent, potentially offering faster startup and lower resource usage for developers who want a terminal-based coding assistant. The explicit caveat that its safety model is a lexical denylist—not a sandbox—means engineers should treat it as running with full user permissions and not rely on it to prevent destructive operations.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
MicroCodex is written in C++23 and builds from source with a C++23 compiler, make, libcurl, and OpenSSL dev files on Linux, with prebuilt binaries available for macOS and Linux on arm64 and x86_64.
The agent's safety mechanism is a lexical denylist that blocks commands like rm -f, rm -rf, git reset --hard, and shutdown, but the project explicitly warns this is not a complete security boundary.
MCP support is not yet implemented, and text cannot currently be copied from the terminal while using MicroCodex.
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