Rename the Artifact tool and shorten the new tools' descriptions

Rename the Artifact Generator display name to "Artifact" (the internal
artifact_generator key is unchanged) and tighten the user-facing one-line
descriptions for Code Executor, Artifact, and Read Document.

application/agents/tools/artifact_generator.py

@@ -377,8 +377,8 @@ def merge_patch(target: Any, patch: Any) -> Any:
 
 
 class ArtifactGeneratorTool(Tool):
-    """Artifact Generator
-    Render editable documents (presentation/document/spreadsheet/pdf/html) from a JSON spec and version them.
+    """Artifact
+    Create, edit, and version documents - slides, docs, sheets, PDF, HTML.
     """
 
     def __init__(self, tool_config: Optional[Dict[str, Any]] = None, user_id: Optional[str] = None) -> None:

application/agents/tools/code_executor.py

@@ -54,7 +54,7 @@ def _tail(stream: Optional[str]) -> str:
 
 class CodeExecutorTool(Tool):
     """Code Executor
-    Run Python (or other) code in a sandboxed, semi-persistent session and capture produced files as artifacts.
+    Run code in a sandboxed session; files it writes become downloadable artifacts.
     """
 
     def __init__(self, tool_config: Optional[Dict[str, Any]] = None, user_id: Optional[str] = None) -> None:

application/agents/tools/read_document.py

@@ -39,7 +39,7 @@ except Exception:  # pragma: no cover - jsonschema is a declared dependency
 
 class ReadDocumentTool(Tool):
     """Read Document
-    Parse an input document artifact (pdf/docx/pptx/...) to text/markdown/structured JSON via the backend parser.
+    Parse a document (PDF, Word, PowerPoint, ...) to text, markdown, or structured data.
     """
 
     # Hidden from the Add-Tool catalog; surfaced (workflow-only) via the