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 and Infographic
Use the right tool for each job, not the same tool for all jobs. GitHub Actions natively understands GitHub events and APIs — trying to MCP-wrap the GitHub API for PR reading and commenting adds unnecessary indirection. But your internal knowledge base and HR system are external, organizational tools that don't live in GitHub's ecosystem — those are exactly what MCP servers are designed for: extending agent reach to arbitrary external systems.
Full explanation below image
Full Explanation
The MCP vs. native GitHub Actions decision is architectural: choose the integration layer that provides the cleanest access to each system with the least overhead.
Option A (GitHub Actions for everything) is wrong for operations 2 and 4. 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.
Option B is correct. 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.
Option C (MCP for everything) 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.
Option D (GitHub Actions for HR system) 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.