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cersei

Maker: pacifio License: MIT Stars: 443 First released: 2026-04-02 Language: Rust

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About

cersei came from reverse-engineering Claude Code's architecture and rebuilding it in Rust as a library: tool execution, LLM streaming, subagent orchestration, persistent memory, skills, and MCP integration all exposed as composable crates for embedding agents in applications. Its pitch is efficiency at the systems level — the companion Abstract CLI binary measures roughly 6MB with 4.9MB RSS and 32ms startup — alongside a three-tier memory design that combines flat files, CLAUDE.md-style context, and an optional graph memory backed by Grafeo, which answers recall queries in microseconds without an LLM call. Developers use it to build custom agents with Claude Code-like capability without Node.js, or to embed agent behavior in products where binary size and memory matter. It is MIT-licensed, Rust-based, installable via Cargo, and actively maintained with published docs and benchmark suites against Claude Code and competing agent frameworks.