Tool Design and MCP Integration
Free Claude Certified Architect - Foundations practice — 6 questions on Tool Design and MCP Integration, with explanations. No sign-up. Full 12-question mixed test →
A company integrates a third-party MCP server that fetches and returns web page content into a Claude-powered agent's context. The security team is concerned about prompt injection: malicious instructions embedded inside fetched web content attempting to hijack Claude's subsequent tool calls. Which mitigation BEST addresses this risk?
Tool outputs, especially from third-party or internet-sourced MCP servers, must be treated as untrusted data. Sandboxing permissions, filtering/validating output, and requiring confirmation before acting on instructions found in tool results directly addresses prompt injection via tool results — a core MCP security principle for architects.
A team wants Claude to consistently follow a detailed internal process — including specific formatting rules and reference templates — for generating quarterly compliance reports. The process requires no live external data or API calls, just consistent application of stored instructions and files. Per CCAR-F guidance on choosing between tools, MCP servers, and Skills, what is the BEST approach?
Skills are designed exactly for this use case: packaging reusable instructions, templates, and reference files that Claude loads into context as needed, without requiring a live network connection or custom protocol integration — unlike MCP servers or tools.
An architect is configuring an MCP server that must run locally on a user's machine and be spawned as a subprocess by the Claude Desktop client, communicating over a lightweight channel without exposing a network port. Which MCP transport should be configured?
stdio transport is the standard MCP transport for local servers launched as subprocesses, exchanging JSON-RPC messages over standard input/output with no network port required.
Per the Model Context Protocol specification, when a tool invocation encounters an error during execution, what is the recommended way for the MCP server to communicate this back to the calling client so Claude can reason about the failure?
MCP tool results support an isError flag; when true, the content field carries a human-readable description of the failure, giving Claude the information needed to explain the issue to the user or attempt an alternative approach.
An enterprise agent has access to over 50 MCP tools aggregated from several connected servers. Users report that Claude frequently selects the wrong tool for a task or ignores the correct tool even though it's available. What is the BEST architectural fix?
Large, poorly curated toolsets cause selection ambiguity. Filtering which tools are exposed based on task context, writing precise non-overlapping tool descriptions, and grouping related tools are the recommended practices for improving tool-selection reliability at scale.
Claude needs to execute Python code within a conversation to perform data analysis and return computed results. Following the architect best practice of preferring built-in capabilities before building custom integrations, what is the BEST approach?
Claude provides a built-in code execution tool that is purpose-built and sandboxed for exactly this use case, requiring no custom server or tool schema to be developed and maintained.
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