A team is building an agent that performs code review. The agent needs to: (1) read PR file diffs, (2) query an internal knowledge base API for coding standards, (3) post review comments to GitHub, and (4) look up the PR author's team membership in an internal HR system. Which integration approach MOST appropriately handles all four needs?
Select an answer to reveal the explanation.
Short Explanation
Use the right tool for each job, not the same tool for all jobs. GitHub Actions natively understands GitHub events and APIs, so don't MCP-wrap PR reading and commenting. Your internal knowledge base and HR system are external organizational tools, so MCP servers are the clean way to extend the agent's reach.
Full Explanation
The MCP versus native GitHub Actions decision is architectural: choose the integration layer that provides the cleanest access to each system with the least overhead.
The approach that uses GitHub Actions for all four operations is wrong for the knowledge base and HR lookup. While GitHub Actions can make HTTP calls to external APIs, doing so requires either custom code in every workflow step or a custom Action. This tightly couples the agent's workflow definition to the external API's interface and makes it difficult to reuse across different agents. It also complicates credential management for non-GitHub systems.
The correct approach is to use the native GitHub Actions GitHub API integration for reading PR file diffs and posting review comments, and configure MCP servers for the internal knowledge base and HR system. GitHub provides first-class native support for reading PRs, accessing file diffs, and posting comments — these operations are why GitHub Actions exists, and GitHub provides well-maintained, authenticated, version-controlled access patterns. The internal knowledge base and HR system are organizational tools that the agent needs to reach across system boundaries — this is precisely the MCP use case. MCP provides a standardized protocol for the agent to call these tools without needing each agent's workflow to know the specific HTTP endpoint structure of every internal system. Different agents can reuse the same MCP servers.
The approach that uses MCP servers for all four operations adds unnecessary indirection for GitHub operations. Wrapping the GitHub API in an MCP server when native GitHub Actions support exists creates an extra maintenance layer with no benefit.
The approach that uses GitHub Actions for PR reading, GitHub commenting, and HR lookup, with MCP only for the knowledge base, is wrong because placing HR system integration inside GitHub Actions entangles a sensitive internal system with GitHub's workflow infrastructure, complicates auditing, and makes it harder to manage the HR system's credentials independently. MCP is the right boundary for non-GitHub organizational systems, even if the knowledge base needs semantic search.