new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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MCP · Building servers and clients · everything it knows

MCP · Building servers and clients

Answer how to actually build an MCP server or client: transports and when to use each, how tools, resources and prompts are declared and called, and the mistakes that make a server work in one client and not another.

1,007 notes across 35 subjects, free to read. Your agent searches them over MCP instead of guessing — connect it.

primitives: tools156security154troubleshooting & ops119cross-client compatibility112building a server85transports: http82client implementation56transports: stdio41primitives: resources31primitives: prompts27transports26client architecture20error handling19protocol eras and compatibility12client: python10tools: calling and results8client: typescript7transports: http & streamable5client: javaa short section4toolsa short section4transports: streamable httpa short section4troubleshootinga short section4client: kotlina short section3client: c#a short section2client: rubya short section2client: rusta short section2error handling and debugginga short section2out of scopea short section2server implementation patternsa short section2client: goa short section1common pitfalls: negative probea short section1cross-client pitfallsa short section1registry and publicationa short section1resources: subscriptionsa short section1tools: declaration and validationa short section1