Question 1

What is HexDocs MCP?

Accepted Answer

HexDocs MCP is a project that provides semantic search capabilities for Hex package documentation, designed specifically for AI applications. It consists of an Elixir binary for processing documentation and a TypeScript server implementing the Model Context Protocol (MCP) for searching.

Question 2

What is MCP (Model Context Protocol)?

Accepted Answer

MCP is an open protocol that standardizes how applications provide context to LLMs. The MCP server acts as a bridge, allowing AI models to access and interact with external data sources and tools.

Question 3

What are the requirements for using HexDocs MCP?

Accepted Answer

You need Ollama (with the `nomic-embed-text` model), Elixir 1.16+ and Erlang/OTP 26+, Mix, and Node.js 22 or later.

Question 4

How do I install HexDocs MCP?

Accepted Answer

You can install it by configuring your MCP client, using Smithery, or adding the `hexdocs_mcp` package to your Elixir project.

Question 5

How do I configure the embedding model?

Accepted Answer

You can configure the default embedding model using the `HEXDOCS_MCP_DEFAULT_EMBEDDING_MODEL` environment variable. Ensure Ollama is running and the specified model is pulled.

Question 6

How do I fetch documentation for a Hex package?

Accepted Answer

Use the command `mix hex.docs.mcp fetch <package_name>`. You can also specify the version and project path.

Question 7

How do I search for documentation?

Accepted Answer

Use the command `mix hex.docs.mcp search --query ""`.

Question 8

Can I use HexDocs MCP offline?

Accepted Answer

Yes, documentation is stored locally, allowing offline access.

Question 9

How do I integrate HexDocs MCP with UBOS?

Accepted Answer

HexDocs MCP enhances UBOS by providing AI Agents with access to searchable Hex documentation, streamlining development and improving AI Agent training.

Question 10

Where is the documentation stored?

Accepted Answer

By default, data is stored in the `~/.hexdocs_mcp` directory. You can change this using the `HEXDOCS_MCP_PATH` environment variable.

Question 11

What do I do if I get errors related to dependencies during installation?

Accepted Answer

Ensure all dependencies are available in the `:dev` environment. Update dependencies like Floki to be available in both `:dev` and `:test` environments.

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