Free, practical write-ups with real data and working code. Nothing to buy to use them. Also available as Markdown for agents: append .md to any guide URL, or read /llms.txt.
MCP 2026-07-28 migration checklist: sessions, initialize and ping are gone 2026-11-02 · ~5 min read A practical, ticket-ready checklist for moving an MCP server or client to protocol revision 2026-07-28 (stateless, server/discover, resultType, Mcp-Method headers, cache hints), with request examples and what to keep for old clients.
Spending guards every paying agent needs (x402, with code) 2026-11-02 · ~6 min read Seven rules to enforce in code before an AI agent signs an x402 payment: cap, budget, recipient and network allow-lists, https, reservation, and human handoff. Includes working @x402/fetch hooks.
What 292 live x402 endpoints get wrong (Nov 2026 survey) 2026-11-02 · ~12 min read We linted one paid route from each of 292 x402 origins. 188 answered with a 402, 19 passed every x402scan check, and 34 of 58 origins disagreed with themselves about which routes they sell.