GitLab MCP Server

Instructions

Implementation Reference

• src/api/issues.ts:149-164 (handler)

  Implementation of addIssueComment which makes a POST request to the GitLab API to add a comment to an issue.

  export async function addIssueComment(projectId: string, issueIid: number, body: string): Promise<GitLabComment> {
    if (!projectId?.trim()) {
      throw new Error("Project ID is required");
    }
    if (!issueIid || issueIid < 1) {
      throw new Error("Valid issue IID is required");
    }
    if (!body?.trim()) {
      throw new Error("Comment body is required");
    }
  
    const endpoint = `/projects/${encodeProjectId(projectId)}/issues/${issueIid}/notes`;
  
    const comment = await gitlabPost<GitLabComment>(endpoint, { body });
    return GitLabCommentSchema.parse(comment);
  }

• src/schemas.ts:448-452 (schema)

  Zod schema for validating add_issue_comment arguments.

  export const AddIssueCommentSchema = z.object({
    project_id: z.string().describe("Project ID or URL-encoded path"),
    issue_iid: z.number().describe("Issue internal ID"),
    body: z.string().describe("Content of the comment")
  });

• src/server.ts:412-416 (registration)

  Registration/Handler block in the MCP server switch statement.

  case "add_issue_comment": {
    const args = AddIssueCommentSchema.parse(request.params.arguments);
    const comment = await api.addIssueComment(args.project_id, args.issue_iid, args.body);
    return { content: [{ type: "text", text: JSON.stringify(comment, null, 2) }] };
  }