fix(git): show blobs and trees for object specs in git_show

src/git/README.md

@@ -85,11 +85,11 @@ Please note that mcp-server-git is currently in early development. The functiona
      - `branch_name` (string): Name of branch to checkout
    - Returns: Confirmation of branch switch
 11. `git_show`
-   - Shows the contents of a commit
+   - Shows the contents of a commit, or of a file or directory at a revision
    - Inputs:
      - `repo_path` (string): Path to Git repository
-     - `revision` (string): The revision (commit hash, branch name, tag) to show
-   - Returns: Contents of the specified commit
+     - `revision` (string): The revision (commit hash, branch name, tag) or object spec (`HEAD:path/to/file`) to show
+   - Returns: Contents of the specified commit, file content, or directory listing
 
 12. `git_branch`
    - List Git branches

src/git/src/mcp_server_git/server.py

@@ -210,6 +210,13 @@ def git_show(repo: git.Repo, revision: str) -> str:
     # even if a malicious ref with that name exists (e.g. via filesystem manipulation)
     if revision.startswith("-"):
         raise BadName(f"Invalid revision: '{revision}' - cannot start with '-'")
+    obj = repo.rev_parse(revision)
+    if isinstance(obj, git.Blob):
+        return obj.data_stream.read().decode("utf-8", errors="replace")
+    if isinstance(obj, git.Tree):
+        return "\n".join(
+            f"{item.name}/" if isinstance(item, git.Tree) else item.name for item in obj
+        )
     commit = repo.commit(revision)
     output = [
         f"Commit: {commit.hexsha!r}\n"
@@ -416,7 +423,7 @@ async def list_tools() -> list[Tool]:
             ),
             Tool(
                 name=GitTools.SHOW,
-                description="Shows the contents of a commit",
+                description="Shows the contents of a commit, or of a file or directory given as <revision>:<path>",
                 inputSchema=GitShow.model_json_schema(),
                 annotations=ToolAnnotations(
                     readOnlyHint=True,

src/git/tests/test_server.py

@@ -279,6 +279,28 @@ def test_git_show_initial_commit(test_repository):
     assert "initial commit" in result
     assert "test.txt" in result
 
+def test_git_show_blob_object_spec(test_repository):
+    file_path = Path(test_repository.working_dir) / "logic" / "infos.py"
+    file_path.parent.mkdir()
+    file_path.write_text("print('infos')\n")
+    test_repository.index.add(["logic/infos.py"])
+    test_repository.index.commit("add infos")
+
+    result = git_show(test_repository, "HEAD:logic/infos.py")
+
+    assert result == "print('infos')\n"
+
+def test_git_show_tree_object_spec(test_repository):
+    file_path = Path(test_repository.working_dir) / "logic" / "infos.py"
+    file_path.parent.mkdir()
+    file_path.write_text("print('infos')\n")
+    test_repository.index.add(["logic/infos.py"])
+    test_repository.index.commit("add infos")
+
+    result = git_show(test_repository, "HEAD:")
+
+    assert result == "logic/\ntest.txt"
+
 
 # Tests for validate_repo_path (repository scoping security fix)