Top 8 Rust langchain Projects

langchain

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1. llm-chain

   1 4 1,605 6.2 Rust

   `llm-chain` is a powerful rust crate for building chains in large language models allowing you to summarise text and complete complex tasks

   

2. AppSignal

   www.appsignal.com sponsored

   AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.

   

3. langchain-rust

   2 1 1,343 0.0 Rust

   🦜️🔗LangChain for Rust, the easiest way to write LLM-based programs in Rust

   

4. vllora

   3 4 812 9.5 Rust

   Debug your AI agents

   

   Project mention: Show HN: Ask your LLM traces what went wrong (vLLora) | news.ycombinator.com | 2026-01-26

   Hi HN,

   We built Lucy, a trace-debugging tool inside vLLora (our open-source LLM observability stack).

   The problem: Debugging AI agents is painful. A single failure often hides inside a trace with 200+ spans—tool calls, retries, partial outputs, and silent failures. Even with tracing, finding the actual root cause (e.g. a tool schema mismatch or a contradictory system prompt) usually means manually scanning logs for 20+ minutes.

   What Lucy does: Lucy lets you query your traces using natural language. You can ask things like “Why did this agent loop?” or “Which step was slow?” and it inspects the span tree to surface likely causes. For example, it can flag:

   - Tool schema mismatches (e.g. hallucinated or invalid arguments)

   - Prompt contradictions (e.g. system instruction conflicts with user intent)

   - Silent failures (e.g. context truncation or max-token exits)

   It’s early and still in beta.

   We’d love to hear how you’re debugging agent failures today—logs, replay, evals, custom scripts, or something else.

   Link to Repo: https://github.com/vllora/vllora

5. tenuo

   4 4 89 9.7 Rust

   Task-scoped authorization for AI agents. Cryptographic warrants constrain tools and arguments, prevent privilege escalation at every delegation hop, and produce signed evidence of what was allowed or denied.

   

   Project mention: Ask HN: What Are You Working On? (May 2026) | news.ycombinator.com | 2026-05-10

   Building tenuo.ai (https://github.com/tenuo-ai/tenuo): task-scoped authorization for AI agents. Rust implementation of capabilities + cryptographic offline verification.

6. RAG-Enterprise

   5 2 57 9.3 Rust

   🚀 100% local RAG system with one-command setup. Your data never leaves your server. Apache-2.0

   

   Project mention: Show HN: RAG-Enterprise – 100% local RAG system for enterprise documents | news.ycombinator.com | 2026-03-01

   License is AGPL-3.0. I get it, some orgs see that and nope out – if it gets traction maybe dual-license down the line.

   Repo, docs and a quick GIF in the README: https://github.com/I3K-IT/RAG-Enterprise

   Would love real feedback, the honest/rude kind especially:

       Setup blow up on your rig?

7. agentshield

   6 1 18 9.5 Rust

   🛡️ The security firewall for AI agent tools & MCP servers (Claude, GPT-5.6, Gemini 3.7, Antigravity, Cursor, Codex, Hermes). Catch command injection, secret theft & toxic flows in <50ms. 100% offline Rust SAST + 1-click auto-fix + SARIF. (by aiconnai)

   

   Project mention: AgentShield – Offline Rust security scanner for AI agent tools and MCP (<50ms) | news.ycombinator.com | 2026-08-16

8. langchainrust

   7 1 14 9.3 Rust

   A Rust framework for building LLM applications with support for 8+ LLM providers, agents, RAG, BM25/hybrid search, LangGraph workflows, and multiple vector/document storage backends.

   

   Project mention: langchain-rust: Build LLM apps with Ollama + local models in pure Rust — no Python needed | dev.to | 2026-08-03

   If you're running local models through Ollama and tired of Python's overhead, check out langchain-rust.

9. Kargo

   akuity.io sponsored

   Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.

   

10. mentedb

    8 4 3 - Rust

    A cognition aware database engine for AI agent memory. Purpose built in Rust with WAL, HNSW, knowledge graphs, and speculative context pre assembly. Not a wrapper, a ground up storage engine that thinks.

    

    Project mention: Your agent knows your preferences. It just never uses them | dev.to | 2026-07-24

    The engine call is recall_for_action in mentedb 0.27.2, the hosted API exposes it as the get_action_rules tool, and npx mentedb-mcp@latest setup installs the hook. Tag a commit rule, ask for a commit, and watch it show up at exactly the right moment. The live demo at demo.mentedb.com has the rest of the memory graph to explore.

Rust langchain related posts

• Ask HN: How are you handling non-probabilistic security for LLM agents?

  2 projects | news.ycombinator.com | 23 Jan 2026

• A Comprehensive Guide to the llm-chain Rust crate

  1 project | dev.to | 6 Jun 2024

• are there anytools or frameworks similar to "langchain" or "llamaindexbut implemented or designed in a language other than python?

  3 projects | /r/LocalLLaMA | 28 Jun 2023

• llm-chain: Rust crate for building LLM chains

  1 project | news.ycombinator.com | 5 Jun 2023

Index

Sponsored

AppSignal knows why the f*#k it crashed.

Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.

www.appsignal.com

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