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Hey Pietro and Luigi here, we are the authors of mcp-use (<a href="https:&#x2F;&#x2F;github.com&#x2F;mcp-use&#x2F;mcp-use">https:&#x2F;&#x2F;github.com&#x2F;mcp-use&#x2F;mcp-use</a>).When the first MCP servers came out we were very excited about the technology, but as soon as we wanted to get our hands dirty, we found out that MCP could be used only through Claude Desktop or Cursor. As engineers, we did not like that. MCP seemed like something you wanted to use to build products and applications yourself, not something to hide behind a closed source application.So we approached the SDK but were pretty dissatisfied with the developer experience (double async loops, lots of boilerplate). We decided to write mcp-use to make our lives easier.mcp-use lets you connect any LLM to any MCP server in just 6 lines of code. We provide a high level abstraction over the official MCP SDK that makes your life easier and supports all the functionalities of the protocol.Demo video here: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=nL_B6LZAsp4" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=nL_B6LZAsp4</a>.The key abstractions we provide are called MCPClient and MCPAgent.MCPClient takes in a set of server configurations, automatically detects the transport type and creates a background task which handles the stream from&#x2F;to the server.MCPAgent is a combination of the MCPClient, an LLM, and a custom system prompt. It consumes the MCP client by transforming the tools, resources and prompts into model agnostic tools that can be called by the LLM.The library also contains some cool utilities:- secure sandboxed execution of MCP servers (we know the protocol doesn&#x27;t shine for security)- meta-tools that allow the agent to search over available servers and tools (to avoid context flooding) and connect dynamically to the server it needs (you could create the omnipotent agent with this).Some cool things we did with this:
- write an agent that can use a browser and create&#x2F;read linear tickets updated with latest information on the internet- write an agent that has access to the metrics of our company to automatically create weekly reports.- I connected an agent to an IKEA curtain I hacked an MCP on to adapt the lighting of my room from images of the lighting situation.- recreated am open source claude code like CLI, with full MCP capability but with custom models and BYOK (<a href="https:&#x2F;&#x2F;github.com&#x2F;mcp-use&#x2F;mcp-use-cli">https:&#x2F;&#x2F;github.com&#x2F;mcp-use&#x2F;mcp-use-cli</a>).We recently crossed 100,000 download and we are used by many organizations, including NASA!We’d love to hear what you think of it, most importantly how we can improve it! We are happy to answer any questions and look forward to your comments.

Show HN: Mcp-use – Connect any LLM to any MCP

Hi HN,We’re Brendan and Michael, the creators of Sourcebot (<a href="https:&#x2F;&#x2F;www.sourcebot.dev&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.sourcebot.dev&#x2F;</a>), a self-hosted code understanding tool for large codebases. We originally launched on HN 9 months ago with code search (<a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=41711032">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=41711032</a>), and we’re excited to share our newest feature: Ask Sourcebot.Ask Sourcebot is an agentic search tool that lets you ask complex questions about your entire codebase in natural language, and returns a structured response with inline citations back to your code. Some types of questions you might ask:- “How does authentication work in this codebase? What library is being used? What providers can a user log in with?” (<a href="https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdpjkrbw000bnn7s8of2dm11" rel="nofollow">https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdpjkrbw000bnn7s8of2dm11</a>)- “When should I use channels vs. mutexes in go? Find real usages of both and include them in your answer” (<a href="https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdpiuqhu000bpg7s9hprio4w" rel="nofollow">https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdpiuqhu000bpg7s9hprio4w</a>)- “How are shards laid out in memory in the Zoekt code search engine?” (<a href="https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdm9nkck000bod7sqy7c1efb" rel="nofollow">https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdm9nkck000bod7sqy7c1efb</a>)- &quot;How do I call C from Rust?&quot; (<a href="https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdpjy06g000pnn7ssf4nk60k" rel="nofollow">https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~&#x2F;chat&#x2F;cmdpjy06g000pnn7ssf4nk60k</a>)You can try it yourself here on our demo site (<a href="https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~" rel="nofollow">https:&#x2F;&#x2F;demo.sourcebot.dev&#x2F;~</a>) or checkout our demo video (<a href="https:&#x2F;&#x2F;youtu.be&#x2F;olc2lyUeB-Q" rel="nofollow">https:&#x2F;&#x2F;youtu.be&#x2F;olc2lyUeB-Q</a>).How is this any different from existing tools like Cursor or Claude code?- Sourcebot solely focuses on code understanding. We believe that, more than ever, the main bottleneck development teams face is not writing code, it’s acquiring the necessary context to make quality changes that are cohesive within the wider codebase. This is true regardless if the author is a human or an LLM.- As opposed to being in your IDE or terminal, Sourcebot is a web app. This allows us to play to the strengths of the web: rich UX and ubiquitous access. We put a ton of work into taking the best parts of IDEs (code navigation, file explorer, syntax highlighting) and packaging them with a custom UX (rich Markdown rendering, inline citations, @ mentions) that is easily shareable between team members.- Sourcebot can maintain an up-to date index of thousands of repos hosted on GitHub, GitLab, Bitbucket, Gerrit, and other hosts. This allows you to ask questions about repositories without checking them out locally. This is especially helpful when ramping up on unfamiliar parts of the codebase or working with systems that are typically spread across multiple repositories, e.g., micro services.- You can BYOK (Bring Your Own API Key) to any supported reasoning model. We currently support 11 different model providers (like Amazon Bedrock and Google Vertex), and plan to add more.- Sourcebot is self-hosted, fair source, and free to use.Under the hood, we expose our existing regular expression search, code navigation, and file reading APIs to a LLM as tool calls. We instruct the LLM via a system prompt to gather the necessary context via these tools to sufficiently answer the users question, and then to provide a concise, structured response. This includes inline citations, which are just structured data that the LLM can embed into it’s response and can then be identified on the client and rendered appropriately. We built this on some amazing libraries like the Vercel AI SDK v5, CodeMirror, react-markdown, and Slate.js, among others.This architecture is intentionally simple. We decided not to introduce any additional techniques like vector embeddings, multi-agent graphs, etc. since we wanted to push the limits of what we could do with what we had on hand. We plan on revisiting our approach as we get user feedback on what works (and what doesn’t).We are really excited about pushing the envelope of code understanding. Give it a try: <a href="https:&#x2F;&#x2F;github.com&#x2F;sourcebot-dev&#x2F;sourcebot">https:&#x2F;&#x2F;github.com&#x2F;sourcebot-dev&#x2F;sourcebot</a>. Cheers!

Show HN: Sourcebot – Self-hosted Perplexity for your codebase