How to test a LangChain agent for security (in 15 lines of FastAPI)

Description and use

<p>You built the agent. It calls a tool, it holds a conversation, it resolves the request in the demo.Then what?</p> <p>For most teams, "then what" is: ship it. The agent works, the demo went well, and there's no obvious next step between "it works" and "it's in production." That gap is where this post lives. Not<br> because testing an agent is hard in principle, but because the tools that do it expect somethingmost agent frameworks don't hand you by default: a plain HTTP endpoint.</p> <h2> "It works" is not a test </h2> <p>Functional testing tells you the agent does what you asked it to do, o

Problem

<p>You built the agent. It calls a tool, it holds a conversation, it resolves the request in the demo.Then what?</p> <p>For most teams, "then what" is: ship it. The agent works, the demo went well, and there's no obvious next step between "it works" and "it's in production." That gap is where this post lives. Not<br> because testing an agent is hard in principle, but because the tools that do it expect somethingmost agent frameworks don't hand you by default: a plain HTTP endpoint.</p> <h2> "It works" is not a test </h2> <p>Functional testing tells you the agent does what you asked it to do, o

Outcome

<p>You built the agent. It calls a tool, it holds a conversation, it resolves the request in the demo.Then what?</p> <p>For most teams, "then what" is: ship it. The agent works, the demo went well, and there's no obvious next step between "it works" and "it's in production." That gap is where this post lives. Not<br> because testing an agent is hard in principle, but because the tools that do it expect somethingmost agent frameworks don't hand you by default: a plain HTTP endpoint.</p> <h2> "It works" is not a test </h2> <p>Functional testing tells you the agent does what you asked it to do, o

Evidence

How to test a LangChain agent for security (in 15 lines of FastAPI)

Source