feat(cli): clarify agent flags and support env defaults (#9063)

Agent deployment options now print a private-beta notice. Rename
`--environment` to `--agent-environment` and accept `LANGSMITH_AGENT_ID`
/ `LANGSMITH_AGENT_ENVIRONMENT` as process-environment defaults for
deploy and list. Explicit flags take precedence, and the backend payload
is unchanged.

Validation: formatting and lint pass. A local smoke check verified
environment-only deployment, explicit flag precedence, list defaults,
and structured JSON output. Full CLI suite: 411 passed; the two known
Docker failures remain (`test_dockerfile_command_with_docker_compose`
and `test_build_generate_proper_build_context`). No new tests added; the
existing test invocation uses the renamed flag.

libs/cli/langgraph_cli/__init__.py

@@ -1 +1 @@
-__version__ = "0.4.31"
+__version__ = "0.4.32"

libs/cli/langgraph_cli/deploy.py

@@ -1690,11 +1690,17 @@ OPT_HOST_URL = click.option(
 )
 
 OPT_AGENT_ID = click.option(
-    "--agent-id", help="Logical agent ID (requires agent mode enabled for the tenant)."
+    "--agent-id",
+    envvar="LANGSMITH_AGENT_ID",
+    show_envvar=True,
+    help="Logical agent ID (requires agent mode enabled for the tenant).",
 )
 
 OPT_AGENT_ENVIRONMENT = click.option(
-    "--environment",
+    "--agent-environment",
+    "environment",
+    envvar="LANGSMITH_AGENT_ENVIRONMENT",
+    show_envvar=True,
     type=click.Choice(["development", "staging", "production"]),
     help="Agent environment (requires agent mode enabled for the tenant).",
 )
@@ -1982,13 +1988,14 @@ def _deploy_cmd(
     validate_deploy_commands(install_command, build_command)
     agent = None
     if agent_id is not None or environment is not None:
+        em.note("Note: --agent-id and --agent-environment flags are in private beta")
         if not agent_id or not agent_id.strip() or not environment:
             raise click.UsageError(
-                "--agent-id and --environment are required together."
+                "--agent-id and --agent-environment are required together."
             )
         if name is not None or deployment_id is not None:
             raise click.UsageError(
-                "--agent-id and --environment cannot be combined with --name or --deployment-id."
+                "--agent-id and --agent-environment cannot be combined with --name or --deployment-id."
             )
         agent = {"agent_id": agent_id, "environment": environment}
     if not config.exists():
@@ -2138,6 +2145,11 @@ def deploy_list(
     agent_id: str | None,
     environment: str | None,
 ) -> None:
+    if agent_id is not None or environment is not None:
+        click.secho(
+            "Note: --agent-id and --agent-environment flags are in private beta",
+            fg="yellow",
+        )
     if agent_id is not None and not agent_id.strip():
         raise click.UsageError("--agent-id must not be empty.")
     filters = {}

libs/cli/tests/unit_tests/test_deploy_agents.py

@@ -58,7 +58,7 @@ AGENT_ARGS = [
     "deploy",
     "--agent-id",
     "customer-support",
-    "--environment",
+    "--agent-environment",
     "staging",
     "--remote",
     "--no-wait",