fix: reduce e2b uname calls

api/agent-notes/core/virtual_environment/providers/e2b_sandbox.py.md

@@ -0,0 +1,16 @@
+# E2B Sandbox Provider Notes
+
+## Purpose
+- Implements the E2B-backed `VirtualEnvironment` provider and bootstraps sandbox metadata, file I/O, and command execution.
+
+## Key Decisions
+- Sandbox metadata is gathered during `_construct_environment` using the E2B SDK before returning `Metadata`.
+- Architecture/OS detection uses a single `uname -m -s` call split into two lines to reduce round-trips.
+- Command execution streams stdout/stderr through `QueueTransportReadCloser`; stdin is unsupported.
+
+## Edge Cases
+- `release_environment` raises when sandbox termination fails.
+- `execute_command` runs in a background thread; consumers must read stdout/stderr until EOF.
+
+## Tests/Verification
+- None yet. Add targeted service tests when behavior changes.

api/core/virtual_environment/providers/e2b_sandbox.py

@@ -132,13 +132,12 @@ class E2BEnvironment(VirtualEnvironment):
             envs=dict(environments),
         )
         info = sandbox.get_info(api_key=options.get(self.OptionsKey.API_KEY, ""))
-        arch_output = sandbox.commands.run("uname -m").stdout.strip()
-        os_output = sandbox.commands.run("uname -s").stdout.strip()
+        system_info = sandbox.commands.run("uname -m -s").stdout.splitlines()
 
         return Metadata(
             id=info.sandbox_id,
-            arch=self._convert_architecture(arch_output),
-            os=self._convert_operating_system(os_output),
+            arch=self._convert_architecture(system_info[0].strip()),
+            os=self._convert_operating_system(system_info[1].strip()),
             store={
                 self.StoreKey.SANDBOX: sandbox,
             },