update sha arg description for list_commits, get_file_contents

Author: LuluBeatson

pkg/github/repositories.go

@@ -111,10 +111,10 @@ func ListCommits(getClient GetClientFn, t translations.TranslationHelperFunc) (t
 				mcp.Description("Repository name"),
 			),
 			mcp.WithString("sha",
-				mcp.Description("The commit SHA, branch name, or tag name to list commits from. If not specified, defaults to the repository's default branch."),
+				mcp.Description("Commit SHA, branch or tag name to list commits of. If not provided, uses the default branch of the repository. If a commit SHA is provided, will list commits up to that SHA."),
 			),
 			mcp.WithString("author",
-				mcp.Description("Author username or email address"),
+				mcp.Description("Author username or email address to filter commits by"),
 			),
 			WithPagination(),
 		),
@@ -470,7 +470,7 @@ func GetFileContents(getClient GetClientFn, getRawClient raw.GetRawClientFn, t t
 				mcp.Description("Accepts optional git refs such as `refs/tags/{tag}`, `refs/heads/{branch}` or `refs/pull/{pr_number}/head`"),
 			),
 			mcp.WithString("sha",
-				mcp.Description("Accepts optional git sha, if sha is specified it will be used instead of ref"),
+				mcp.Description("Accepts optional commit SHA. If specified, it will be used instead of ref"),
 			),
 		),
 		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {