Agent Engineering Patterns in LangChain

Agents extend LLMs with reasoning and action — from API calls to tool chains.

Tool Abstraction

Wrap external capabilities as tools:

function searchTool(query) {
  return externalSearch(query)
}

Planner + Executor

Split logic into planning and execution stages so agents decide what to do before doing it.

Safety Constraints

Define rule sets to prevent unsafe actions:

if (bannedActions.includes(userRequest)) {
  return "Action not allowed"
}

Summary

Agent Engineering turns LLMs into context-aware, tool-enabled systems.