Q20 of 60 — CCA Practice Exam

Developer Productivity with Claude

Your team has built a developer productivity agent using the Claude Agent SDK. The agent is configured with three MCP servers — one for GitHub, one for Jira, and one for an internal documentation service — and the MCP server connections are confirmed healthy in the logs. However, developers report that Claude never invokes any of the MCP tools, even when prompts explicitly ask it to search the internal docs or create a GitHub issue. What is the most likely root cause of this behavior?

A. The three MCP servers are using incompatible transport types; mixing HTTP and local process transports prevents Claude from discovering available tools across servers.

B. The allowedTools field is missing or not configured for the MCP servers, so Claude can see the tool definitions but is not permitted to call them.

C. The system prompt does not explicitly instruct Claude to prefer MCP tools over built-in capabilities, so Claude defaults to its internal knowledge instead of invoking external tools.

D. The agent's context window is saturated by the tool schemas from three MCP servers, causing Claude to skip tool selection and generate a direct response.