add tool to retrieve diff of commits.

pmcp/mcp_server/github_server/services/contents.py

@@ -24,6 +24,23 @@ class ContentService:
         """
         params = {"sha": branch, "per_page": per_page}
         return await self.client.GET(f"{owner}/{repo}/commits", params=params)
+    
+    async def get_commit_details(
+        self, owner: str, repo: str, sha: str
+    ) -> dict:
+        """
+        Retrieve a single commit’s metadata *and* its file-level diff.
+
+        Args:
+            owner (str): Repository owner.
+            repo (str):  Repository name.
+            sha (str):   Commit SHA.
+
+        Returns:
+            Full JSON payload for the commit, including `commit.message` and
+            a `files` array where each entry has a `patch` (the diff).
+        """
+        return await self.client.GET(f"{owner}/{repo}/commits/{sha}")
 
     async def get_file(
         self, owner: str, repo: str, path: str, ref: str | None = None

pmcp/mcp_server/github_server/tools/contents.py

@@ -2,7 +2,7 @@
 Commit and file-content tools.
 """
 import base64
-from typing import List, Dict
+from typing import Any, List, Dict
 from mcp.server.fastmcp import Context
 from pmcp.mcp_server.github_server.services.contents import ContentService
 from pmcp.mcp_server.github_server.github import github_client
@@ -28,8 +28,13 @@ async def get_recent_commits(
     """
     try:
         commits = await service.recent_commits(owner, repo, branch, per_page)
-        shas = [c["sha"] for c in commits]
-        return {"commits": shas}
+        # return a list of { sha, message }
+        items = [
+            {"sha": c["sha"], "message": c["commit"]["message"]}
+            for c in commits
+        ]
+        return {"commits": items}
+        
     except Exception as exc:
         error_msg = f"Error while getting the commits for branch {branch} in {repo}. Error {str(exc)}"
         await ctx.error(str(exc))
@@ -59,4 +64,39 @@ async def get_file_contents(
     except Exception as exc:
         error_msg = f"Error while getting the content of file {path} in repository {repo}. Error: {exc}"      
         await ctx.error(str(error_msg))
+        raise
+
+
+async def get_commit_details(
+    ctx: Context, owner: str, repo: str, sha: str
+) -> Dict[str, Any]:
+    """
+    Retrieves a commit by SHA, including its commit message and the diff.
+
+    Args:
+        ctx:    FastMCP request context.
+        owner:  Repository owner.
+        repo:   Repository name.
+        sha:    Commit SHA.
+
+    Returns:
+        {
+          "sha": "...",
+          "message": "...",
+          "files": [
+             { "filename": "...", "patch": "diff text..." },
+             … 
+          ]
+        }
+    """
+    try:
+        commit = await service.get_commit_details(owner, repo, sha)
+        message = commit["commit"]["message"]
+        files = [
+            {"filename": f["filename"], "patch": f.get("patch", "")}
+            for f in commit.get("files", [])
+        ]
+        return {"sha": sha, "message": message, "files": files}
+    except Exception as exc:
+        await ctx.error(str(exc))
         raise

pmcp/mcp_server/github_server/tools/tools.py

@@ -25,6 +25,7 @@ def register_tools(mcp):
     mcp.add_tool(branches.list_branches)
     mcp.add_tool(contents.get_recent_commits)
     mcp.add_tool(contents.get_file_contents)
+    mcp.add_tool(contents.get_commit_details)