feat: add list_documents discovery tool

src/grist_mcp/tools/__init__.py

@@ -0,0 +1 @@
+"""MCP tools for Grist operations."""

src/grist_mcp/tools/discovery.py

@@ -0,0 +1,12 @@
+"""Discovery tools - list accessible documents."""
+
+from grist_mcp.auth import Agent
+
+
+async def list_documents(agent: Agent) -> dict:
+    """List documents this agent can access with their permissions."""
+    documents = [
+        {"name": scope.document, "permissions": scope.permissions}
+        for scope in agent._token_obj.scope
+    ]
+    return {"documents": documents}