Top 23 Rust model-context-protocol Projects
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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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
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Project mention: I Connected 3 MCP Servers to Claude & Built a No-Code Research Agent That Actually Cites Sources | dev.to | 2025-09-25
Domain-specific academic databases (biomcp + mcp-simple-arXiv)
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You could try to use a router. I'm currently building this:
https://github.com/grafbase/nexus/
If croq talks openai API, you enable the anthropic protocol, and openai provider with a base url to croq. Set ANTHROPIC_BASE_URL to the open endpoint and start claude.
I haven't tested croq yet, but this could be an interesting use case...
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template-repo
Agent orchestration & security template featuring MCP tool building, agent2agent workflows, mechanistic interpretability on sleeper agents, and agent integration via CLI wrappers (by AndrewAltimit)
Project mention: Template for secure AI multi-agent coding workflows | news.ycombinator.com | 2026-02-06 -
forge-orchestrator
Forge Orchestrator: Multi-AI task orchestration. File locking, knowledge capture, drift detection. Rust.
Forge: github.com/nxtg-ai/forge-plugin | forge.nxtg.ai
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mcp-reticle
Reticle intercepts, visualizes, and profiles JSON-RPC traffic between your LLM and MCP servers in real-time, with zero latency overhead. Stop debugging blind. Start seeing everything.
Project mention: Debugging MCP Tool Calls Sucks: Reticle Is “Wireshark for MCP” | dev.to | 2026-01-06 -
There are many ways to set SurrealMCP up. This is one way to run it locally with a local DB in memory:
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Sephera
Fast local-first Rust CLI for codebase metrics, AST-compressed LLM context bundles, and built-in MCP server.
Project mention: Show HN: Sephera – AST-compressed context packs and native MCP server in Rust | news.ycombinator.com | 2026-04-03 -
fossil-mcp
The code quality toolkit for the agentic AI era. Find dead code, clones, and scaffolding across 15 languages. MCP server + CLI.
Project mention: Fossil MCP – Dead code detection for vibe-coded projects | news.ycombinator.com | 2026-02-10 -
Project mention: Show HN: Rs-Utcp, a Rust Implementation of the Universal Tool Calling Protocol | news.ycombinator.com | 2025-11-25
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mcpls
Universal MCP to LSP bridge - expose Language Server Protocol capabilities as MCP tools for AI agents
Project mention: Language Server Protocol (LSP) for AI Coding Agents | news.ycombinator.com | 2026-01-04 -
Agent-Span
The Web Access Gateway for AI Agents — 52 channels, 92 MCP tools, 9 SDKs, self-healing backends, async Rust
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mcp-gateway
Universal MCP Gateway - Single-port multiplexing with Meta-MCP for ~95% context token savings (by MikkoParkkola)
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codeprism
An experimental, 100% AI-generated, high-performance code intelligence server providing AI assistants with a graph-based understanding of codebases.
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Project mention: Show HN: UFFS, a Rust NTFS search engine benchmarked against Everything | news.ycombinator.com | 2026-07-08
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Project mention: Show HN: MCP-framework – Build MPC servers and AI agents in Rust | news.ycombinator.com | 2025-11-11
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sync
The agent harness you steer — structured context, automatic staleness gates, and block-by-block review, all bound to your code. Local-first, MCP-native, open source. (by sync-buzz)
Project mention: Sync – Quality Control and Project Management System for AI Agents | news.ycombinator.com | 2026-06-14 -
daedra
Self-contained web search MCP server. Multiple backends with automatic fallback. Pure Rust. Works from any IP.
Repository: daedra
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Project mention: Show HN: Clipboard-MCP – System clipboard access for AI assistants | news.ycombinator.com | 2026-03-27
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roberto-mcp
Simple Code Analysis MCP server, language agnostic with code indexing and search capabilities.
Project mention: Bridging the Gap: Turning Code Parsing Experience into AI Context | dev.to | 2025-10-03The project is live on GitHub and crates.io. What started as scratching my own itch has become a tool that bridges years of code analysis expertise with modern AI capabilities.
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Index
What are some of the best open-source model-context-protocol projects in Rust? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | grafbase | 1,231 |
| 2 | vllora | 810 |
| 3 | biomcp | 548 |
| 4 | nexus | 436 |
| 5 | mcp-guardian | 200 |
| 6 | template-repo | 130 |
| 7 | forge-orchestrator | 129 |
| 8 | mcp-reticle | 114 |
| 9 | surrealmcp | 98 |
| 10 | Sephera | 76 |
| 11 | fossil-mcp | 63 |
| 12 | rs-utcp | 57 |
| 13 | mcpls | 49 |
| 14 | Agent-Span | 43 |
| 15 | offeryn | 37 |
| 16 | mcp-gateway | 34 |
| 17 | codeprism | 31 |
| 18 | UltraFastFileSearch | 25 |
| 19 | mcp-framework | 23 |
| 20 | sync | 13 |
| 21 | daedra | 11 |
| 22 | clipboard-mcp | 9 |
| 23 | roberto-mcp | 8 |
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