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Day 8 — API Gateway & Agent-Facing APIs #11

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@PunithVT

Day 8. We've shipped Lambda, MCP, and a containerized agent — time to put a proper API in front. Picking API Gateway + agent-facing API design so the gap between "works on my machine" and "works for users" closes.

Topics to cover:

  1. API Gateway — REST vs HTTP API, when to pick which, throttling and usage plans
  2. Custom domains, mTLS, and Cognito / JWT authorizers
  3. Streaming agent responses — SSE vs WebSockets, the 29s API GW timeout gotcha
  4. MCP-over-HTTP — exposing an MCP server with auth, scopes, and rate limits
  5. OpenAPI for agent tools — schema-first design so the LLM gets clean tool descriptions

Plan: Chandana takes API Gateway core + auth + custom domains, I take streaming + MCP-over-HTTP + OpenAPI for agents, we ship a small public agent endpoint.

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