# platform

- [What is API rate limiting, and how do I handle a 429?](/explained/platform/what-is-api-rate-limiting-and-how-do-i-handle-a-429)
- [What is idempotency, and how do I handle duplicate webhooks?](/explained/platform/what-is-idempotency-and-how-do-i-handle-duplicate-webhooks)
- [What is llms.txt, and does it help agents?](/explained/platform/what-is-llms-txt-and-does-it-help-agents)
- [What is MCP?](/explained/platform/what-is-mcp)
- [What is the difference between an MCP server and an SDK?](/explained/platform/what-is-the-difference-between-an-mcp-server-and-an-sdk)
- [What is tool calling, and how is it different from function calling?](/explained/platform/what-is-tool-calling-and-how-is-it-different-from-function-calling)
- [What is WebMCP?](/explained/platform/what-is-webmcp)
- [Why is my message accepted but not delivered?](/explained/platform/why-is-my-message-accepted-but-not-delivered)