vectara-agent-orchestration

Build multi-step, deterministic, step-gated Vectara agents. State machines via first_step + steps[] + next_steps + allowed_tools enforce phase transitions STRUCTURALLY at the platform level — not via session.metadata variables read by a single-step LLM prompt. Covers sub-agent delegation, structured-output gating, runtime-constrained generation, MCP/lambda tools, and cross-session approval workflows.