lumen

About lumen

Claude reads entire files to find what it needs. Lumen gives it a map. Lumen is a 100% local semantic code search engine for AI coding agents. No API keys, no cloud, no external database, just open-source embedding models (Ollama or LM Studio), SQLite, and your CPU. A single static binary and your own local embedding server. The payoff is measurable and reproducible: across 9 benchmark runs on 9 languages and real GitHub bug-fix tasks, Lumen cuts cost in every single language — up to 39%.

agentic-coding claude claude-ai claude-code claude-pl codex context gemini golang gpt-5

Quick Facts

Stars	244
Forks	28
Language	Go
Category	MCP Server
Quality Score	32.8/100
Open Issues	20
Last Updated	2026-08-11
Created	2026-02-27
Platforms	claude-code, codex, gemini, go, mcp
Est. Tokens	~1661k

Compatible Skills

These tools work well together with lumen for enhanced workflows:

lazyagent — semantic(0.22)+complementary+same_lang+similar_pop+shared_platform (53%)
oc-go-cc — semantic(0.21)+complementary+same_lang+similar_pop+shared_platform (52%)
pockode — semantic(0.21)+complementary+same_lang+similar_pop+shared_platform (52%)
chop — semantic(0.19)+complementary+same_lang+similar_pop+shared_platform (52%)
ccNexus — semantic(0.19)+complementary+same_lang+similar_pop+shared_platform (52%)

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Frequently Asked Questions

What is lumen?

lumen is Save 30% token costs when using Claude Code, Codex, OpenCode for free - with open source, local semantic search. Works for small and large codebases and monorepos! Enterprise-ready and fully compliant. It is categorized as a MCP Server with 244 GitHub stars.

What programming language is lumen written in?

lumen is primarily written in Go. It covers topics such as agentic-coding, claude, claude-ai.

How do I install or use lumen?

You can find installation instructions and usage details in the lumen GitHub repository at github.com/ory/lumen. The project has 244 stars and 28 forks, indicating an active community.

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