diff --git a/.changeset/angry-peas-study.md b/.changeset/angry-peas-study.md
new file mode 100644
index 00000000..732e649f
--- /dev/null
+++ b/.changeset/angry-peas-study.md
@@ -0,0 +1,5 @@
+---
+'containers-mcp': patch
+---
+
+fix: use blob field for binary resources to prevent context overflow (#252)
diff --git a/apps/sandbox-container/server/containerMcp.ts b/apps/sandbox-container/server/containerMcp.ts
index ecbf9900..71e1a29a 100644
--- a/apps/sandbox-container/server/containerMcp.ts
+++ b/apps/sandbox-container/server/containerMcp.ts
@@ -165,10 +165,9 @@ export class ContainerMcpAgent extends McpAgent<Env, never, Props> {
 						{
 							type: 'resource',
 							resource: {
-								...(readFile.type === 'text' 
+								...(readFile.type === 'text'
 									? { text: readFile.textOutput }
-									: { blob: readFile.base64Output }
-								),
+									: { blob: readFile.base64Output }),
 								uri: `file://${path}`,
 								mimeType: readFile.mimeType,
 							},