AI-102 Implement an agentic solution Practice Question
You are deploying an agentic solution using Azure AI Agent Service. The agent needs to be invoked from a custom application using REST API calls. Which endpoint should you use to send a message to the agent?
⚠ Common exam trap
Many candidates confuse the endpoint for sending a message with the endpoint for starting a run, mistakenly thinking that POST /threads/{thread_id}/runs both sends the message and invokes the agent, when in fact messages must be added separately before a run.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
POST /threads/{thread_id}/messages
To send a message to an existing conversation thread in Azure AI Agent Service, you must use the POST /threads/{thread_id}/messages endpoint. This adds the user's message to the specified thread, which the agent can then process in a subsequent run. The REST API requires the thread to already exist, and messages are posted directly to that thread's resource.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
POST /threads/{thread_id}/runs
Why it's wrong here
This endpoint triggers an agent run, not send a message.
- ✗
POST /threads
Why it's wrong here
This endpoint creates a new thread, not send a message.
- ✓
POST /threads/{thread_id}/messages
Why this is correct
This endpoint adds a message to an existing thread.
- ✗
GET /agents
Why it's wrong here
This endpoint lists agents, not send messages.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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