> For the complete documentation index, see [llms.txt](https://docs.glik.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.glik.ai/system-architecture.md).

# System Architecture

- [Overview](https://docs.glik.ai/system-architecture/overview.md)
- [Blocks & Nodes](https://docs.glik.ai/system-architecture/blocks-and-nodes.md)
- [Utilities](https://docs.glik.ai/system-architecture/blocks-and-nodes/utilities.md)
- [Start Block](https://docs.glik.ai/system-architecture/blocks-and-nodes/utilities/start-block.md)
- [End Node](https://docs.glik.ai/system-architecture/blocks-and-nodes/utilities/end-node.md)
- [HTTP Request](https://docs.glik.ai/system-architecture/blocks-and-nodes/utilities/http-request.md)
- [List Operator](https://docs.glik.ai/system-architecture/blocks-and-nodes/utilities/list-operator.md)
- [Classifier Nodes](https://docs.glik.ai/system-architecture/blocks-and-nodes/classifier-nodes.md)
- [Question Classifier](https://docs.glik.ai/system-architecture/blocks-and-nodes/classifier-nodes/question-classifier.md)
- [Logic Blocks](https://docs.glik.ai/system-architecture/blocks-and-nodes/logic-blocks.md)
- [IF/ELSE Branch](https://docs.glik.ai/system-architecture/blocks-and-nodes/logic-blocks/if-else-branch.md)
- [Iteration](https://docs.glik.ai/system-architecture/blocks-and-nodes/logic-blocks/iteration.md)
- [Loop](https://docs.glik.ai/system-architecture/blocks-and-nodes/logic-blocks/loop.md)
- [Transform Blocks](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks.md)
- [Variable Assigner](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks/variable-assigner.md)
- [Variable Aggregator](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks/variable-aggregator.md)
- [Parameter Extractor](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks/parameter-extractor.md)
- [Data Enrichment](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks/data-enrichment.md)
- [Prompt Template](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks/prompt-template.md)
- [Code](https://docs.glik.ai/system-architecture/blocks-and-nodes/transform-blocks/code.md)
- [Input & Extraction](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction.md)
- [Doc Extractor](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/doc-extractor.md)
- [Knowledge Retrieval](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/knowledge-retrieval.md)
- [LLM Block](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/llm-block.md)
- [LLM Reasoning](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/llm-block/llm-reasoning.md): Enables adaptive decision-making, reduces manual review, and adds explainability to enterprise workflows.
- [Fallback to LLM Reasoning](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/llm-block/fallback-to-llm-reasoning.md): Fallback to LLM Reasoning provides resilience and human-like adaptability in GLIK workflows. It ensures continuity, captures contextual judgment, and keeps workflows flexible when predefined logic is
- [Tool Node](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/tool-node.md)
- [Agent](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/agent.md)
- [Answer](https://docs.glik.ai/system-architecture/blocks-and-nodes/input-and-extraction/answer.md)
- [GLIK Knowledge](https://docs.glik.ai/system-architecture/glik-knowledge.md)
- [Creating & Managing Knowledge](https://docs.glik.ai/system-architecture/glik-knowledge/creating-and-managing-knowledge.md)
- [GLIK Knowledge Retrieval](https://docs.glik.ai/system-architecture/glik-knowledge/glik-knowledge-retrieval.md)
- [Writing to Knowledge](https://docs.glik.ai/system-architecture/glik-knowledge/writing-to-knowledge.md)
- [Scoped Memory & Access Control](https://docs.glik.ai/system-architecture/glik-knowledge/scoped-memory-and-access-control.md)
- [Injection & Variable Binding](https://docs.glik.ai/system-architecture/glik-knowledge/injection-and-variable-binding.md)
- [Performance & Limits](https://docs.glik.ai/system-architecture/glik-knowledge/performance-and-limits.md)
- [Execution Model](https://docs.glik.ai/system-architecture/execution-model.md): Depending on the App Type selected (e.g., Chatbot, Agent, Advanced Chat, Workflow), this logic may be wrapped in conversation, triggered by system events, or embedded in no-code frontends.
- [Workflow Architecture](https://docs.glik.ai/system-architecture/execution-model/workflow-architecture.md)
- [Flow Engine](https://docs.glik.ai/system-architecture/execution-model/flow-engine.md)
- [Node Lifecycle](https://docs.glik.ai/system-architecture/execution-model/node-lifecycle.md)
- [Protocol Compatibility & Schema Interoperability](https://docs.glik.ai/system-architecture/execution-model/protocol-compatibility-and-schema-interoperability.md)
- [Input Binding & Value Resolution](https://docs.glik.ai/system-architecture/execution-model/input-binding-and-value-resolution.md)
- [Memory & Variable Scope](https://docs.glik.ai/system-architecture/memory-and-variable-scope.md)
- [Conversation Variables](https://docs.glik.ai/system-architecture/memory-and-variable-scope/conversation-variables.md)
- [Memory Layers (User, App, Org)](https://docs.glik.ai/system-architecture/memory-and-variable-scope/memory-layers-user-app-org.md)
- [Memory Slot Injection](https://docs.glik.ai/system-architecture/memory-and-variable-scope/memory-slot-injection.md)
- [Memory Retention Policy](https://docs.glik.ai/system-architecture/memory-and-variable-scope/memory-retention-policy.md)
- [Decision Routing](https://docs.glik.ai/system-architecture/decision-routing.md)
- [Conditional Logic Engine](https://docs.glik.ai/system-architecture/decision-routing/conditional-logic-engine.md)
- [LLM Fallthrough Patterns](https://docs.glik.ai/system-architecture/decision-routing/llm-fallthrough-patterns.md)
- [Policy Enforcement & Escalation Paths](https://docs.glik.ai/system-architecture/decision-routing/policy-enforcement-and-escalation-paths.md)
- [Enterprise Orchestration](https://docs.glik.ai/system-architecture/enterprise-orchestration.md)
- [Policy-Driven Automation](https://docs.glik.ai/system-architecture/enterprise-orchestration/policy-driven-automation.md)
- [Enterprise Modularity](https://docs.glik.ai/system-architecture/enterprise-orchestration/enterprise-modularity.md)
- [Auditability & Governance](https://docs.glik.ai/system-architecture/enterprise-orchestration/auditability-and-governance.md)
- [Explainability & Decision Transparency](https://docs.glik.ai/system-architecture/enterprise-orchestration/explainability-and-decision-transparency.md)
- [Agentifying Legacy Systems](https://docs.glik.ai/system-architecture/agentifying-legacy-systems.md)
- [Why Legacy Systems Resist Change](https://docs.glik.ai/system-architecture/agentifying-legacy-systems/why-legacy-systems-resist-change.md)
- [Best Practices for Agentifying ERP Workflows](https://docs.glik.ai/system-architecture/agentifying-legacy-systems/best-practices-for-agentifying-erp-workflows.md)
- [GLIK’s Wrap-Around Model](https://docs.glik.ai/system-architecture/agentifying-legacy-systems/gliks-wrap-around-model.md)
- [Agent Surfaces (PDF, OCR, API, UI)](https://docs.glik.ai/system-architecture/agentifying-legacy-systems/agent-surfaces-pdf-ocr-api-ui.md)
- [No-API Memory-Based Control](https://docs.glik.ai/system-architecture/agentifying-legacy-systems/no-api-memory-based-control.md)
- [Compliance & Risk Considerations](https://docs.glik.ai/system-architecture/agentifying-legacy-systems/compliance-and-risk-considerations.md)
- [System Observability](https://docs.glik.ai/system-architecture/system-observability.md)
- [Execution Logs](https://docs.glik.ai/system-architecture/system-observability/execution-logs.md)
- [Save Points & Snapshots](https://docs.glik.ai/system-architecture/system-observability/save-points-and-snapshots.md)
- [Variable Debugging](https://docs.glik.ai/system-architecture/system-observability/variable-debugging.md)
- [Session Trace Viewer](https://docs.glik.ai/system-architecture/system-observability/session-trace-viewer.md)


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