agentc is a minimal coding agent written in freestanding C23 with no libc. It ships as a static binary under 1 MB, starts in under a millisecond, speaks MCP first, and exposes a versioned C ABI for C and Rust extensions.
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The stripped binary is about 940 KiB with roughly 0.7 MB of RSS at cold start and no runtime to install.
Tools, prompts and resources come first, then a versioned C ABI in include/agentc_ext.h for extensions.
A bench target reports cold-start time, peak RSS and binary size, and compares the same numbers against codex, Claude Code and pi.
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