Orchestration · Software component

Agent Action Output Parser

Software componentOrchestrationOrchestration & Toolsarc:ActionOutputParser

A parsing component that extracts the next tool call, its input, or the final answer from free-text model output in a prescribed reasoning format, returning malformed output to the model with error feedback for retry.

Responsibility. Converts free-text model output into structured agent actions.

Also known as: Output parser, ReAct output parser, handle_parsing_errors

Direct neighbourhood (hover for relationship types)

Relationships

is invoked by dependency

ReAct Agent Controller Ch2.3

sends data to dynamic

ReAct Agent Controller Ch2.3

Design guidance

SHOULD handle malformed tool-call output gracefully by retrying with error feedback instead of terminating execution.

Classification

Patterns: Thought-Action-Action Input-Observation formatRetry with parse-error feedback
Technologies: LangChain
Quality attributes: Reliability (ISO/IEC 25010 | NIST AI RMF: valid and reliable)
Risks mitigated: Agent crash on malformed tool-call output

Sources

Ch2.3: T. Nguyen, "LangChain Sequential Frameworks," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 2.3. ISBN: 9798244538229.