Module 09 Knowledge Check
5 questions. Pass mark 4 out of 5. Answer every question before checking the answer key below, then retry after reading the feedback.
1. Streaming improves perceived responsiveness but must not…
- A. Show partial text
- B. Present unverified partial output as a final, checked answer
- C. Use callbacks
- D. Reduce latency
2. Callbacks are primarily useful for…
- A. Changing the model
- B. Observing execution - timing, token usage, tool calls, and errors
- C. Improving accuracy
- D. Storing vectors
3. When streaming a response that later fails validation, the app should…
- A. Leave the partial text as the answer
- B. Clearly replace or mark it, so the user does not act on invalid output
- C. Ignore the failure
- D. Retry silently in place
4. Token usage captured via callbacks is valuable because…
- A. It is required
- B. It makes cost per request measurable and attributable before it becomes a surprise
- C. It speeds requests
- D. It improves output
5. Streaming tool-calling agents is harder because…
- A. Tools are slow
- B. Intermediate steps are not final answers, so raw streaming can confuse users
- C. Callbacks fail
- D. Tokens differ
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Answer Key and Explanations
Check these only after attempting every question.
1. B - Present unverified partial output as a final, checked answer
Show progress while making clear what is provisional versus confirmed.
2. B - Observing execution - timing, token usage, tool calls, and errors
They are the instrumentation hook that makes behaviour visible.
3. B - Clearly replace or mark it, so the user does not act on invalid output
Streamed text is already on screen; failure must be communicated, not quietly dropped.
4. B - It makes cost per request measurable and attributable before it becomes a surprise
Cost problems are much cheaper to fix when they are visible per feature.
5. B - Intermediate steps are not final answers, so raw streaming can confuse users
Users need step-level framing ('searching…', 'drafting…'), not a raw thought stream.
Practical Check
Apply this module to your own work: complete the module activity for *Streaming and Callbacks*, then write one sentence naming what your result shows and one naming what it does not.
Strong Answer Pattern
A strong answer names the task, the evidence used, the check performed, and the remaining limitation. It avoids "proved", "guaranteed", or "always" unless the evidence genuinely supports it.