GitHub Enterprise MCP Server

Instructions

Implementation Reference

• src/tools/pull-requests.ts:342-359 (handler)

  The core handler function implementing the 'update-pull-request-branch' tool. It validates input using Zod schema, calls the GitHub API's pulls.updateBranch method, and returns the result.

  export async function updatePullRequestBranch(args: unknown): Promise<any> {
    const { owner, repo, pull_number, expected_head_sha } = UpdatePullRequestBranchSchema.parse(args);
    const github = getGitHubApi();
  
    return tryCatchAsync(async () => {
      const { data } = await github.getOctokit().pulls.updateBranch({
        owner,
        repo,
        pull_number,
        expected_head_sha,
      });
  
      return {
        message: data.message,
        url: data.url,
      };
    }, 'Failed to update pull request branch');
  }

• src/utils/validation.ts:169-172 (schema)

  Zod schema for validating the input parameters of the update-pull-request-branch tool.

  export const UpdatePullRequestBranchSchema = OwnerRepoSchema.extend({
    pull_number: z.number().int().positive(),
    expected_head_sha: z.string().optional(),
  });

• src/server.ts:950-976 (registration)

  Tool registration in the ListTools response, defining the tool name, description, and input schema.

  {
    name: 'update-pull-request-branch',
    description: 'Update a pull request branch with the latest changes from the base branch',
    inputSchema: {
      type: 'object',
      properties: {
        owner: {
          type: 'string',
          description: 'Repository owner (username or organization)',
        },
        repo: {
          type: 'string',
          description: 'Repository name',
        },
        pull_number: {
          type: 'number',
          description: 'Pull request number',
        },
        expected_head_sha: {
          type: 'string',
          description: 'The expected SHA of the pull request\'s HEAD ref',
        },
      },
      required: ['owner', 'repo', 'pull_number'],
      additionalProperties: false,
    },
  },

• src/server.ts:1244-1246 (registration)

  Dispatch case in the CallToolRequest handler that invokes the updatePullRequestBranch function.

  case 'update-pull-request-branch':
    result = await updatePullRequestBranch(parsedArgs);
    break;