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Semantic code analysis MCP server providing intelligent code understanding, refactoring suggestions, and...
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SkillMaxx / Development / Lumen
Lumen
Precise local semantic code search via MCP. Indexes your codebase with Go AST parsing, embeds with Ollama or LM Studio, and exposes vector search to Claude through an MCP server — no cloud, no npm.
- GitHub
- ory/lumen ↗
- Stars
- ★ 308
- Last updated
- Hands-on tests
- Tested ✓ in 2 of 5
Install
Tested ✓✓ Verified from docsOfficial docs ↗
/plugin install lumen@claude-plugins-officialTested ✓ on 2026-10-16: installed and loaded in a throwaway sandbox with no credentials.
Log excerpt
Installing plugin "lumen@claude-plugins-official"...✔ Successfully installed plugin: lumen@claude-plugins-official (scope: user)
$ verify:
❯ lumen@claude-plugins-official
Status: ✔ enabled1 run, latest 2026-10-16
Not yet tested
No official Codex instructions yet. We haven't found docs saying this works in Codex.
Know it works? Tell us →Tested ✓✓ Verified from docsOfficial docs ↗
Auto-loaded from your Claude Code plugins (no extra setup per xAI docs)Tested ✓ on 2026-10-16: installed and loaded in a throwaway sandbox with no credentials.
Log excerpt
Installed 1 plugin(s) from claude-plugins-official: lumen $ verify: lumen-e1463819: lumen [git: https://github.com/ory/lumen.git] (claude-plugins-official)
1 run, latest 2026-10-16
Not yet tested
No official Cursor instructions yet. We haven't found docs saying this works in Cursor.
Know it works? Tell us →Not yet tested
No official Pi instructions yet. We haven't found docs saying this works in Pi.
Know it works? Tell us →README
View on GitHub ↗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%. Output tokens drop by up to 66%, sessions complete up to 53% faster, and patch quality is maintained in every task. All verified with a transparent, open-source benchmark framework that you can run yourself.
| With Lumen | Baseline (no Lumen) | |
|---|---|---|
| Cost (avg, bug-fix) | $0.29 (-26%) | $0.40 |
| Time (avg, bug-fix) | 125s (-28%) | 174s |
| Output tokens (avg) | 5,247 (-37%) | 8,323 |
| JavaScript (marked) | $0.32, 119s (-33%, -53%) | $0.48, 255s |
| Rust (toml) | $0.38, 204s (-39%, -34%) | $0.61, 310s |
| PHP (monolog) | $0.14, 34s (-27%, -34%) | $0.19, 52s |
| TypeScript (commander) | $0.14, 56s (-27%, -33%) | $0.19, 84s |
| Svelte (chat-ui) | $0.10, 56s (-26%, -31%) | $0.14, 80s |
| Patch quality | Maintained in all 9 tasks | — |
Preview from the source repo. Images are removed.
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