Langgraph on Fernando Hermidahttps://www.fernandohermida.com/tags/langgraph/Recent content in Langgraph on Fernando HermidaHugoen-usMon, 10 Aug 2026 00:00:00 +0000Graphs, Not Chainshttps://www.fernandohermida.com/posts/agentic-ai-engineering-journey/04-graphs-not-chains/Mon, 10 Aug 2026 00:00:00 +0000https://www.fernandohermida.com/posts/agentic-ai-engineering-journey/04-graphs-not-chains/Why LangGraph models an agent as an explicit graph of nodes and edges instead of a hidden loop, and the core primitives that make that possible.Durable State and Checkpointshttps://www.fernandohermida.com/posts/agentic-ai-engineering-journey/05-durable-state-and-checkpoints/Mon, 10 Aug 2026 00:00:00 +0000https://www.fernandohermida.com/posts/agentic-ai-engineering-journey/05-durable-state-and-checkpoints/How LangGraph snapshots a graph’s state after every step, so a run can survive a crash, get inspected mid-flight, or resume exactly where it left off.Human-in-the-Loop Interruptshttps://www.fernandohermida.com/posts/agentic-ai-engineering-journey/06-human-in-the-loop-interrupts/Mon, 10 Aug 2026 00:00:00 +0000https://www.fernandohermida.com/posts/agentic-ai-engineering-journey/06-human-in-the-loop-interrupts/How LangGraph’s interrupt() pauses a running graph mid-step to ask a human before a risky action, and how Command(resume=…) picks it back up.Tracing Agents with OpenTelemetryhttps://www.fernandohermida.com/posts/agentic-ai-engineering-journey/10-tracing-agents-with-opentelemetry/Mon, 10 Aug 2026 00:00:00 +0000https://www.fernandohermida.com/posts/agentic-ai-engineering-journey/10-tracing-agents-with-opentelemetry/When one specific agent run goes wrong, aggregate pass rates won’t tell you where. A span tree of every model call and tool call will, whether it’s built automatically, by a decorator, or by hand.Timeouts, Retries, and Loop Limitshttps://www.fernandohermida.com/posts/agentic-ai-engineering-journey/11-timeouts-retries-and-loop-limits/Mon, 10 Aug 2026 00:00:00 +0000https://www.fernandohermida.com/posts/agentic-ai-engineering-journey/11-timeouts-retries-and-loop-limits/A timeout bounds a call, a retry survives a transient failure, and a hard iteration limit is what stops an agent that never planned to.