ReAct Pattern (Reasoning + Acting) 2026: Deep Turkish Technical Guide — From Academia to Production
Most comprehensive Turkish technical guide for ReAct Pattern (Reasoning + Acting): academic foundation (Yao et al. 2022 ICLR paper), CoT vs ReAct difference, Thought-Action-Observation loop, 5 ReAct variants (Vanilla, MRKL, Self-Ask, ReWOO, Plan-and-Execute), LangChain + LangGraph + LlamaIndex implementations, agentic tool use integration, 25+ Turkish practical examples, error handling, production deployment, observability, cost optimization, model comparison.
1. Introduction
ReAct Pattern - LLMs generate Thoughts, take Actions (tool calls), receive Observations. Yao et al. 2022 ICLR paper. Foundation of modern agentic AI.
2. CoT vs ReAct
CoT - internal reasoning only. ReAct - reasoning + external world interaction.
3. T-A-O Loop
Thought - Action - Observation iterative cycle until final answer.
4. 5 Variants
Vanilla ReAct, MRKL, Self-Ask, ReWOO, Plan-and-Execute.
5. Modern Implementation
LangChain AgentExecutor, LangGraph state machines, OpenAI Function Calling.
6. Tool Design
8 principles - atomic, descriptive, strict schema, deterministic, error handling, idempotent, bounded, auditable.
7. Cost Optimization
3-10x CoT - use ReWOO, prompt caching, smaller models for simple tasks.
8. Conclusion
ReAct foundational for agentic AI. LangGraph state machine modern best practice.
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