Agent
SystemsA model that can plan and take actions through tools, rather than only returning a single text response.
In practice
A research agent searches the web, opens sources, and writes a cited brief.
Toolstellar AI Glossary
AI terms, without the hand-waving.
A practical glossary for the words that show up in every AI conversation. Every card explains the term in place — no extra tab required.
Context window
ModelsThe amount of text, code, or other tokens a model can consider at one time.
In practice
A 200k-token context window can hold a long report and a set of source documents.
Embedding
RetrievalA numeric representation of content that captures semantic meaning for search and comparison.
In practice
Support articles with similar meanings have vectors that sit close together.
Hallucination
SafetyA confident output that is fabricated or unsupported by evidence.
In practice
A citation that looks real but points to a paper that does not exist.
RAG
RetrievalRetrieval-augmented generation: retrieving relevant sources and giving them to a model before it answers.
In practice
A support assistant searches the help center, then writes an answer with citations.