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Written by Max Zeshut
Founder at Agentmelt
Coordinating the execution order, error handling, and data flow between multiple function calls within an agent's workflow. When an agent needs to call five APIs to complete a task, function orchestration determines which calls can run in parallel, which depend on previous results, how to handle partial failures, and how to retry or fall back gracefully.
A sales agent qualifying a lead calls the CRM (get contact info), enrichment API (company data), intent API (buying signals), and calendar API (availability)—all in parallel. The orchestrator waits for all results before the agent drafts the outreach email.