Add support for listing PR comments

Author: jspahrsummers

src/github/README.md

@@ -261,6 +261,14 @@ MCP Server for the GitHub API, enabling file operations, repository management,
      - `expected_head_sha` (optional string): The expected SHA of the pull request's HEAD ref
    - Returns: Success message when branch is updated
 
+25. `get_pull_request_comments`
+   - Get the review comments on a pull request
+   - Inputs:
+     - `owner` (string): Repository owner
+     - `repo` (string): Repository name
+     - `pull_number` (number): Pull request number
+   - Returns: Array of pull request review comments with details like the comment text, author, and location in the diff
+
 ## Search Query Syntax
 
 ### Code Search

src/github/index.ts

@@ -54,6 +54,8 @@ import {
   SearchUsersResponseSchema,
   SearchUsersSchema,
   UpdateIssueOptionsSchema,
+  GetPullRequestCommentsSchema,
+  PullRequestCommentSchema,
   type FileOperation,
   type GitHubCommit,
   type GitHubContent,
@@ -879,6 +881,29 @@ async function updatePullRequestBranch(
   }
 }
 
+async function getPullRequestComments(
+  owner: string,
+  repo: string,
+  pullNumber: number
+): Promise<z.infer<typeof PullRequestCommentSchema>[]> {
+  const response = await fetch(
+    `https://api.github.com/repos/${owner}/${repo}/pulls/${pullNumber}/comments`,
+    {
+      headers: {
+        Authorization: `token ${GITHUB_PERSONAL_ACCESS_TOKEN}`,
+        Accept: "application/vnd.github.v3+json",
+        "User-Agent": "github-mcp-server",
+      },
+    }
+  );
+
+  if (!response.ok) {
+    throw new Error(`GitHub API error: ${response.statusText}`);
+  }
+
+  return z.array(PullRequestCommentSchema).parse(await response.json());
+}
+
 async function getPullRequestStatus(
   owner: string,
   repo: string,
@@ -1048,6 +1073,11 @@ server.setRequestHandler(ListToolsRequestSchema, async () => {
         name: "update_pull_request_branch",
         description: "Update a pull request branch with the latest changes from the base branch",
         inputSchema: zodToJsonSchema(UpdatePullRequestBranchSchema)
+      },
+      {
+        name: "get_pull_request_comments",
+        description: "Get the review comments on a pull request",
+        inputSchema: zodToJsonSchema(GetPullRequestCommentsSchema)
       }
     ],
   };
@@ -1298,6 +1328,12 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         return { content: [{ type: "text", text: "Pull request branch updated successfully" }] };
       }
 
+      case "get_pull_request_comments": {
+        const args = GetPullRequestCommentsSchema.parse(request.params.arguments);
+        const comments = await getPullRequestComments(args.owner, args.repo, args.pull_number);
+        return { content: [{ type: "text", text: JSON.stringify(comments, null, 2) }] };
+      }
+
       default:
         throw new Error(`Unknown tool: ${request.params.name}`);
     }

src/github/schemas.ts

@@ -820,5 +820,39 @@ export const UpdatePullRequestBranchSchema = z.object({
   expected_head_sha: z.string().optional().describe("The expected SHA of the pull request's HEAD ref")
 });
 
+// Schema for PR comments
+export const GetPullRequestCommentsSchema = z.object({
+  owner: z.string().describe("Repository owner (username or organization)"),
+  repo: z.string().describe("Repository name"),
+  pull_number: z.number().describe("Pull request number")
+});
+
+export const PullRequestCommentSchema = z.object({
+  url: z.string(),
+  id: z.number(),
+  node_id: z.string(),
+  pull_request_review_id: z.number().nullable(),
+  diff_hunk: z.string(),
+  path: z.string().nullable(),
+  position: z.number().nullable(),
+  original_position: z.number().nullable(),
+  commit_id: z.string(),
+  original_commit_id: z.string(),
+  user: GitHubIssueAssigneeSchema,
+  body: z.string(),
+  created_at: z.string(),
+  updated_at: z.string(),
+  html_url: z.string(),
+  pull_request_url: z.string(),
+  author_association: z.string(),
+  _links: z.object({
+    self: z.object({ href: z.string() }),
+    html: z.object({ href: z.string() }),
+    pull_request: z.object({ href: z.string() })
+  })
+});
+
 export type CombinedStatus = z.infer<typeof CombinedStatusSchema>;
 export type UpdatePullRequestBranch = z.infer<typeof UpdatePullRequestBranchSchema>;
+export type GetPullRequestComments = z.infer<typeof GetPullRequestCommentsSchema>;
+export type PullRequestComment = z.infer<typeof PullRequestCommentSchema>;