CCDV-F Tools and MCP Integration Practice Question
Exhibit
DEBUG [mcp] Sending request: tools/call { name: 'get_files', arguments: { path: '/' } }
DEBUG [mcp] Received response: { error: { code: -32601, message: 'Method not found' } }Refer to the exhibit. A developer is debugging an MCP integration and sees these logs in their console. What is the most likely cause of this error?
⚠ Common exam trap
Candidates often blame network connectivity or syntax errors in the JSON payload, missing that the JSON-RPC -32601 error specifically points to an unregistered method.
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
✓
The 'get_files' tool is not correctly defined in the server's list_tools handler.
The error code -32601 is a standard JSON-RPC error indicating that the requested method does not exist on the server. In the context of MCP, this means the Host is trying to call a tool named 'get_files', but the Server has not registered or implemented a tool with that exact name in its tool list.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The MCP Server is using an outdated version of the protocol.
Why it's wrong here
While version mismatches can cause issues, they typically result in connection errors or schema validation failures rather than a specific 'Method not found' error. This error code specifically targets the absence of the requested function, suggesting the connection is active but the specific capability is missing from the server.
- ✓
The 'get_files' tool is not correctly defined in the server's list_tools handler.
Why this is correct
Every MCP server must implement a handler that lists available tools. If 'get_files' is missing from this list, the Host might still try to call it (perhaps due to cached info or hardcoding), but the Server will reject the call with a 'Method not found' error because it doesn't recognize it.
- ✗
The path argument '/' is restricted by the server's security policy.
Why it's wrong here
Security or permission errors usually return a different error code, such as -32000 or a custom error message indicating 'Permission Denied'. A 'Method not found' error occurs earlier in the request processing pipeline, before the server even attempts to validate the arguments or execute the underlying logic.
- ✗
The model (Claude) generated a malformed JSON object for the arguments.
Why it's wrong here
Malformed JSON would typically trigger a -32700 'Parse error' or -32602 'Invalid params' error. Since the log shows the request was successfully sent and the server responded with 'Method not found', it indicates the JSON structure was likely valid, but the tool name itself was the issue.
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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 CCDV-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 CCDV-F exam.