CCAO-F Prompting and Context Engineering Practice Question
Exhibit
{"error": "Invalid request: system prompt must be provided as a string"}Refer to the exhibit. You are receiving this error in your Python integration. What is the likely cause of this issue?
⚠ Common exam trap
Candidates frequently assume API parameters accept arbitrary iterables like lists of strings for fields that strictly require a single concatenated string.
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
✓
You are passing a list of strings to the system parameter instead of a single concatenated string.
Anthropic's API expects the system prompt to be a single string. If a developer accidentally passes a list, dictionary, or another object type into the system field, the API will reject the request. This is a common integration error that highlights the importance of data type validation before passing parameters to the API client, ensuring all fields meet the expected schema requirements.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Your prompt contains invalid characters that the JSON parser cannot read.
Why it's wrong here
The API error specifically mentions the 'system prompt' parameter type, not an encoding or parsing issue. If there were invalid characters, the error would likely relate to JSON decoding or character encoding, rather than a specific constraint about the format of the system prompt itself.
- ✓
You are passing a list of strings to the system parameter instead of a single concatenated string.
Why this is correct
The Anthropic API requires the system prompt to be a flat string. If you have multiple instructions, they must be joined together into one coherent string before being sent. Passing a list or nested structure violates the API schema and will trigger the specific 'must be provided as a string' error.
- ✗
You are using an outdated version of the Anthropic SDK that no longer supports system prompts.
Why it's wrong here
System prompts are a core feature of the Anthropic API. An outdated SDK would more likely produce version mismatch errors or connection issues, not a type-check error regarding the system prompt format. The error message is a clear indicator of a parameter mismatch within the request payload.
- ✗
Your system prompt exceeds the maximum token length limit for the model.
Why it's wrong here
If the system prompt were too long, the API would return a 'request too large' or 'token limit exceeded' error. The provided error explicitly references the data type ('must be provided as a string'), which points to a programming error in the structure of the request, not the content length.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Anthropic exam blueprint
This CCAO-F practice question is part of Courseiva's free Anthropic certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CCAO-F exam.