feat: implement native multimodal autonomous sensory capabilities

nanobot/agent/tools/filesystem.py

@@ -1,10 +1,13 @@
 """File system tools: read, write, edit, list."""
 
+import base64
 import difflib
+import mimetypes
 from pathlib import Path
 from typing import Any
 
 from nanobot.agent.tools.base import Tool
+from nanobot.utils.helpers import detect_image_mime
 
 
 def _resolve_path(
@@ -91,7 +94,7 @@ class ReadFileTool(_FsTool):
             "required": ["path"],
         }
 
-    async def execute(self, path: str, offset: int = 1, limit: int | None = None, **kwargs: Any) -> str:
+    async def execute(self, path: str, offset: int = 1, limit: int | None = None, **kwargs: Any) -> Any:
         try:
             fp = self._resolve(path)
             if not fp.exists():
@@ -99,13 +102,28 @@ class ReadFileTool(_FsTool):
             if not fp.is_file():
                 return f"Error: Not a file: {path}"
 
-            all_lines = fp.read_text(encoding="utf-8").splitlines()
+            raw = fp.read_bytes()
+            if not raw:
+                return f"(Empty file: {path})"
+
+            mime = detect_image_mime(raw) or mimetypes.guess_type(path)[0]
+            if mime and mime.startswith("image/"):
+                b64 = base64.b64encode(raw).decode()
+                return [
+                    {"type": "image_url", "image_url": {"url": f"data:{mime};base64,{b64}"}, "_meta": {"path": str(fp)}},
+                    {"type": "text", "text": f"(Image file: {path})"}
+                ]
+
+            try:
+                text_content = raw.decode("utf-8")
+            except UnicodeDecodeError:
+                return f"Error: Cannot read binary file {path} (MIME: {mime or 'unknown'}). Only UTF-8 text and images are supported."
+
+            all_lines = text_content.splitlines()
             total = len(all_lines)
 
             if offset < 1:
                 offset = 1
-            if total == 0:
-                return f"(Empty file: {path})"
             if offset > total:
                 return f"Error: offset {offset} is beyond end of file ({total} lines)"