# HIDDEN - Core concepts

* [**What tools are & how Digital Workers use them**](/agenticstudio/resource-library/hidden-core-concepts/what-tools-are-and-how-digital-workers-use-them.md)

  *What tools are, the types available, & how Digital Workers use them to retrieve data, run logic, & interact with external systems.*
* [**What connectors are & how they work**](/agenticstudio/resource-library/hidden-core-concepts/what-connectors-are-and-how-they-work.md)

  *How connectors link Agentic Studio to external platforms & how authentication & communication are handled.*
* [**How memory works in Agentic Studio**](/agenticstudio/resource-library/hidden-core-concepts/how-memory-works-in-agentic-studio.md)

  *The memory types available to Digital Workers & how each supports different retention needs across interactions.*
* [**What skills are & how they extend Digital Workers**](/agenticstudio/resource-library/hidden-core-concepts/what-skills-are-and-how-they-extend-digital-workers.md)

  *What skills are & how they work as reusable, shareable capabilities across Digital Workers in a workspace.*
* [**How evaluations work & what they measure**](/agenticstudio/resource-library/hidden-core-concepts/how-evaluations-work-and-what-they-measure.md)

  *How evaluations assess performance & what the scored results indicate about behavior.*


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