Hello, MCP World!

Talk delivered at DevFest Bletchley Park 2025.

1. Bletchley Park Daniela Petruzalek Developer Relations, Google Cloud Hello, MCP World!
2. About me… DevRel at Google UK Originally from Brazil Backend / Data Engineer Currently obsessed with AI Love Games, Anime and Cats =^_^=
3. Agenda What is MCP? MCP Demos Go SDK for MCP
4. MCP is an open protocol that standardizes how applications provide context to large language models (LLMs). (...) MCP enables you to build agents and complex workflows on top of LLMs and connects your models with the world.
5. https://modelcontextprotocol.io/docs/learn/architecture
6. Data layer: JSON-RPC based Transport layer: • Standard IO • Streamable HTTPS • HTTP+SSE (deprecated) Communication Layers
7. { "jsonrpc":"2.0","id":1, "method":"initialize", "params":{"protocolVersion":"2025-06-18"} } { "jsonrpc":"2.0", "method":"notifications/initialized","params":{} } { "jsonrpc":"2.0","id":2, "method":"tools/list", "params":{} }
8. Building Blocks Tools: model-controlled, execute actions Prompts: user-controlled, interaction templates Resources: app-controlled, contextual data
9. Tools github.com/danicat/godoctor Bletchley Park
10. Bletchley Park Prompts github.com/danicat/speedgrapher
11. Bletchley Park Resources
13. medium.com/@laurentkubaski
14. If the model needs to discover and call it, it’s a Tool. If the user and/or application decides when it’s relevant to call it (...), it’s a Resource. Source: Laurent Kubaski
15. Model Context Protocol (MCP) is an open standard that allows AI models to connect and communicate with external tools and data sources Bletchley Park Go SDK for MCP
16. github.com/modelcontextprotocol/go-sdk/
17. Shameless plug - Part II Lab @ 3:45 PM: Build an MCP with Gemini CLI and Go
18. Lessons Learned The more you build, the better you will understand it Less is more: be selective when adding MCPs to agents MCPs should not be just an 1:1 adapter for your APIs
19. Bletchley Park Go SDK: github.com/modelcontextprotocol/go-sdk Examples: github.com/danicat/devfest2025 Daniela Petruzalek Developer Relations, Google Cloud danicat.dev | @danicat83 Thank you!