add capability to list commits of a branch

src/github/index.ts

@@ -41,7 +41,8 @@ import {
   CreateIssueSchema,
   CreatePullRequestSchema,
   ForkRepositorySchema,
-  CreateBranchSchema
+  CreateBranchSchema,
+  ListCommitsSchema
 } from './schemas.js';
 import { z } from 'zod';
 import { zodToJsonSchema } from 'zod-to-json-schema';
@@ -467,6 +468,40 @@ async function createRepository(
   return GitHubRepositorySchema.parse(await response.json());
 }
 
+async function listCommits(
+  owner: string,
+  repo: string,
+  page: number = 1,
+  perPage: number = 30,
+  sha?: string,
+): Promise<GitHubCommit[]> {
+  const url = new URL(`https://api.github.com/repos/${owner}/${repo}/commits`);
+  url.searchParams.append("page", page.toString());
+  url.searchParams.append("per_page", perPage.toString());
+  if (sha) { 
+    url.searchParams.append("sha", sha);
+  }
+  
+  const response = await fetch(
+    url.toString(),
+    {
+      method: "GET",
+      headers: {
+        "Authorization": `token ${GITHUB_PERSONAL_ACCESS_TOKEN}`,
+        "Accept": "application/vnd.github.v3+json",
+        "User-Agent": "github-mcp-server",
+        "Content-Type": "application/json"
+      },
+    }
+  );
+
+  if (!response.ok) {
+    throw new Error(`GitHub API error: ${response.statusText}`);
+  }
+
+  return GitHubCommitSchema.array().parse(await response.json());
+}
+
 server.setRequestHandler(ListToolsRequestSchema, async () => {
   return {
     tools: [
@@ -514,6 +549,11 @@ server.setRequestHandler(ListToolsRequestSchema, async () => {
         name: "create_branch",
         description: "Create a new branch in a GitHub repository",
         inputSchema: zodToJsonSchema(CreateBranchSchema)
+      },
+      {
+        name: "list_commits",
+        description: "Get list of commits of a branch in a GitHub repository",
+        inputSchema: zodToJsonSchema(ListCommitsSchema)
       }
     ]
   };
@@ -623,6 +663,12 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         return { content: [{ type: "text", text: JSON.stringify(pullRequest, null, 2) }] };
       }
 
+      case "list_commits": {
+        const args = ListCommitsSchema.parse(request.params.arguments);
+        const results = await listCommits(args.owner, args.repo, args.page, args.perPage, args.sha);
+        return { content: [{ type: "text", text: JSON.stringify(results, null, 2) }] };
+      }
+
       default:
         throw new Error(`Unknown tool: ${request.params.name}`);
     }

src/github/schemas.ts

@@ -308,6 +308,15 @@ export const SearchRepositoriesSchema = z.object({
   perPage: z.number().optional().describe("Number of results per page (default: 30, max: 100)")
 });
 
+export const ListCommitsSchema = z.object({
+  owner: z.string().describe("Repository owner (username or organization)"),
+  repo: z.string().describe("Repository name"),
+  page: z.number().optional().describe("Page number for pagination (default: 1)"),
+  perPage: z.number().optional().describe("Number of results per page (default: 30, max: 100)"),
+  sha: z.string().optional()
+    .describe("SHA of the file being replaced (required when updating existing files)")
+});
+
 export const CreateRepositorySchema = z.object({
   name: z.string().describe("Repository name"),
   description: z.string().optional().describe("Repository description"),