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XERJ (GitHub Repo)
XERJ is a local, Elasticsearch-compatible search engine designed to give coding agents AST-aware context without burning tokens on massive file reads.
What: Created by the team at TypeSafe AI, XERJ uses tree-sitter to index code, logs, and documentation into searchable local indices, enabling agents to retrieve relevant functions or logic passages instead of full files. It supports hybrid search, works as an MCP server, and benchmarks report significant token savings (2.7x reduction in output tokens) compared to grep-driven agent workflows.
Why it matters: Retrieving context via simple grep or file loading is inefficient for large codebases; indexing code with AST awareness improves the precision of agent reasoning while lowering API costs.
Takeaway: Install with 'curl -fsSL https://xerj.org/get | sh', run 'xerj autoindex ~/your-project', and link it to your Claude Code or Cursor MCP configuration.
Decoder
- AST (Abstract Syntax Tree): A tree representation of the abstract syntactic structure of source code, which XERJ uses to index code by symbols rather than raw text.
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