Agent Loop
The short answer · 26 words
In short
An agent loop is the repeated sequence of model decision, possible tool use, evaluation of the result and the next step up to a termination criterion.
Flow-alerta.cab (2026): Agent Loop. https://flow-alerta.cab/en/glossar/agent-loop. Editorially reviewed on: 09 October 2026.
How much detail would you like?
Practical
Core mechanism of many agentic systems; however, without limits, it can increase costs, latency and risk of error.
Possible example: A research agent searches for a source, evaluates the result, starts a second search for gaps and ends according to fulfilled quality criteria.
Potential applications: multi-stage research, document processing, support and automation, where interim results determine the next step.
At a glance
- Core
- Agent runners typically perform multiple turns: the model decides on response or tool call, tool results flow back, and the cycle continues until a final result, error, or defined limit is reached.
- Use
- Core mechanism of many agentic systems; however, without limits, it can increase costs, latency and risk of error.
- Example
- Possible example: A research agent searches for a source, evaluates the result, starts a second search for gaps and ends according to fulfilled quality criteria.
- Limits
- No maximum turn number; unclear cancellation conditions; tool errors endlessly repeat; costs and runtime not monitored; side effects execute multiple times.
In context
Questions about this term
Does every agent need a loop?
Not mandatory.
How do you stop them?
Through final output, error logic as well as turn, time, cost or task limits.
All details and background
Agent runners typically perform multiple turns: the model decides on response or tool call, tool results flow back, and the cycle continues until a final result, error, or defined limit is reached.
ELI5 – Explained simply
The agent does not just think once: it can act, look at the result and then choose the next step.
Why it matters in practice
Core mechanism of many agentic systems; however, without limits, it can increase costs, latency and risk of error.
Example
Possible example: A research agent searches for a source, evaluates the result, starts a second search for gaps and ends according to fulfilled quality criteria.
Pitfalls and limits
- No maximum turn number; unclear cancellation conditions; tool errors endlessly repeat; costs and runtime not monitored; side effects execute multiple times.
Origin & history
The current OpenAI Agents SDK documents the repeated sequence in the runner including max_turns.
Use in mid-sized companies
- Potential applications: multi-stage research, document processing, support and automation, where interim results determine the next step.
Related terms
- Tool Use / Function Calling
- ReAct
- Agent orchestration
- Observability
Matching Flow-alerta service
AI assistants & automationAI assistants & automation: test a suitable process with clear rights and human test points.Matching tool / use case
View use casesPossible use: iterative research with termination criteria; documented example: OpenAI Agents SDK Runner.Sources
- openai.github.ioOpenAI Agents SDK, Running agents
- arxiv.orgYao et al. (2022), ReAct
Quellenprüfung: 09.10.2026. Anwendungsbeispiele sind mögliche Szenarien, keine behaupteten Kundenfälle.
Editorially reviewed on: