fix(terminal): strip Hermes provider env vars from subprocess environment (#1157)

Terminal subprocesses inherit OPENAI_BASE_URL and other provider env
vars loaded from ~/.hermes/.env, silently misrouting external CLIs
like codex.  Build a blocklist dynamically from the provider registry
so new providers are automatically covered.  Callers that truly need
a blocked var can opt in via the _HERMES_FORCE_ prefix.

Closes #1002

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

tests/tools/test_local_env_blocklist.py

@@ -0,0 +1,173 @@
+"""Tests for provider env var blocklist in LocalEnvironment.
+
+Verifies that Hermes-internal provider env vars (OPENAI_BASE_URL, etc.)
+are stripped from subprocess environments so external CLIs are not
+silently misrouted.
+
+See: https://github.com/NousResearch/hermes-agent/issues/1002
+"""
+
+import os
+import threading
+from unittest.mock import MagicMock, patch
+
+from tools.environments.local import (
+    LocalEnvironment,
+    _HERMES_PROVIDER_ENV_BLOCKLIST,
+    _HERMES_PROVIDER_ENV_FORCE_PREFIX,
+)
+
+
+def _make_fake_popen(captured: dict):
+    """Return a fake Popen constructor that records the env kwarg."""
+    def fake_popen(cmd, **kwargs):
+        captured["env"] = kwargs.get("env", {})
+        proc = MagicMock()
+        proc.poll.return_value = 0
+        proc.returncode = 0
+        proc.stdout = iter([])
+        proc.stdout.close = lambda: None
+        proc.stdin = MagicMock()
+        return proc
+    return fake_popen
+
+
+def _run_with_env(extra_os_env=None, self_env=None):
+    """Execute a command via LocalEnvironment with mocked Popen
+    and return the env dict passed to the subprocess."""
+    captured = {}
+    fake_interrupt = threading.Event()
+    test_environ = {
+        "PATH": "/usr/bin:/bin",
+        "HOME": "/home/user",
+        "USER": "testuser",
+    }
+    if extra_os_env:
+        test_environ.update(extra_os_env)
+
+    env = LocalEnvironment(cwd="/tmp", timeout=10, env=self_env)
+
+    with patch("tools.environments.local._find_bash", return_value="/bin/bash"), \
+         patch("subprocess.Popen", side_effect=_make_fake_popen(captured)), \
+         patch("tools.terminal_tool._interrupt_event", fake_interrupt), \
+         patch.dict(os.environ, test_environ, clear=True):
+        env.execute("echo hello")
+
+    return captured.get("env", {})
+
+
+class TestProviderEnvBlocklist:
+    """Provider env vars loaded from ~/.hermes/.env must not leak."""
+
+    def test_blocked_vars_are_stripped(self):
+        """OPENAI_BASE_URL and other provider vars must not appear in subprocess env."""
+        leaked_vars = {
+            "OPENAI_BASE_URL": "http://localhost:8000/v1",
+            "OPENAI_API_KEY": "sk-fake-key",
+            "OPENROUTER_API_KEY": "or-fake-key",
+            "ANTHROPIC_API_KEY": "ant-fake-key",
+            "LLM_MODEL": "anthropic/claude-opus-4-6",
+        }
+        result_env = _run_with_env(extra_os_env=leaked_vars)
+
+        for var in leaked_vars:
+            assert var not in result_env, f"{var} leaked into subprocess env"
+
+    def test_registry_derived_vars_are_stripped(self):
+        """Vars from the provider registry (ANTHROPIC_TOKEN, ZAI_API_KEY, etc.)
+        must also be blocked — not just the hand-written extras."""
+        registry_vars = {
+            "ANTHROPIC_TOKEN": "ant-tok",
+            "CLAUDE_CODE_OAUTH_TOKEN": "cc-tok",
+            "ZAI_API_KEY": "zai-key",
+            "Z_AI_API_KEY": "z-ai-key",
+            "GLM_API_KEY": "glm-key",
+            "KIMI_API_KEY": "kimi-key",
+            "MINIMAX_API_KEY": "mm-key",
+            "MINIMAX_CN_API_KEY": "mmcn-key",
+        }
+        result_env = _run_with_env(extra_os_env=registry_vars)
+
+        for var in registry_vars:
+            assert var not in result_env, f"{var} leaked into subprocess env"
+
+    def test_safe_vars_are_preserved(self):
+        """Standard env vars (PATH, HOME, USER) must still be passed through."""
+        result_env = _run_with_env()
+
+        assert "HOME" in result_env
+        assert result_env["HOME"] == "/home/user"
+        assert "USER" in result_env
+        assert "PATH" in result_env
+
+    def test_self_env_blocked_vars_also_stripped(self):
+        """Blocked vars in self.env are stripped; non-blocked vars pass through."""
+        result_env = _run_with_env(self_env={
+            "OPENAI_BASE_URL": "http://custom:9999/v1",
+            "MY_CUSTOM_VAR": "keep-this",
+        })
+
+        assert "OPENAI_BASE_URL" not in result_env
+        assert "MY_CUSTOM_VAR" in result_env
+        assert result_env["MY_CUSTOM_VAR"] == "keep-this"
+
+
+class TestForceEnvOptIn:
+    """Callers can opt in to passing a blocked var via _HERMES_FORCE_ prefix."""
+
+    def test_force_prefix_passes_blocked_var(self):
+        """_HERMES_FORCE_OPENAI_API_KEY in self.env should inject OPENAI_API_KEY."""
+        result_env = _run_with_env(self_env={
+            f"{_HERMES_PROVIDER_ENV_FORCE_PREFIX}OPENAI_API_KEY": "sk-explicit",
+        })
+
+        assert "OPENAI_API_KEY" in result_env
+        assert result_env["OPENAI_API_KEY"] == "sk-explicit"
+        # The force-prefixed key itself must not appear
+        assert f"{_HERMES_PROVIDER_ENV_FORCE_PREFIX}OPENAI_API_KEY" not in result_env
+
+    def test_force_prefix_overrides_os_environ_block(self):
+        """Force-prefix in self.env wins even when os.environ has the blocked var."""
+        result_env = _run_with_env(
+            extra_os_env={"OPENAI_BASE_URL": "http://leaked/v1"},
+            self_env={f"{_HERMES_PROVIDER_ENV_FORCE_PREFIX}OPENAI_BASE_URL": "http://intended/v1"},
+        )
+
+        assert result_env["OPENAI_BASE_URL"] == "http://intended/v1"
+
+
+class TestBlocklistCoverage:
+    """Sanity checks that the blocklist covers all known providers."""
+
+    def test_issue_1002_offenders(self):
+        """Blocklist includes the main offenders from issue #1002."""
+        must_block = {
+            "OPENAI_BASE_URL",
+            "OPENAI_API_KEY",
+            "OPENROUTER_API_KEY",
+            "ANTHROPIC_API_KEY",
+            "LLM_MODEL",
+        }
+        assert must_block.issubset(_HERMES_PROVIDER_ENV_BLOCKLIST)
+
+    def test_registry_vars_are_in_blocklist(self):
+        """Every api_key_env_var and base_url_env_var from PROVIDER_REGISTRY
+        must appear in the blocklist — ensures no drift."""
+        from hermes_cli.auth import PROVIDER_REGISTRY
+
+        for pconfig in PROVIDER_REGISTRY.values():
+            for var in pconfig.api_key_env_vars:
+                assert var in _HERMES_PROVIDER_ENV_BLOCKLIST, (
+                    f"Registry var {var} (provider={pconfig.id}) missing from blocklist"
+                )
+            if pconfig.base_url_env_var:
+                assert pconfig.base_url_env_var in _HERMES_PROVIDER_ENV_BLOCKLIST, (
+                    f"Registry base_url_env_var {pconfig.base_url_env_var} "
+                    f"(provider={pconfig.id}) missing from blocklist"
+                )
+
+    def test_extra_auth_vars_covered(self):
+        """Non-registry auth vars (ANTHROPIC_TOKEN, CLAUDE_CODE_OAUTH_TOKEN)
+        must also be in the blocklist."""
+        extras = {"ANTHROPIC_TOKEN", "CLAUDE_CODE_OAUTH_TOKEN"}
+        assert extras.issubset(_HERMES_PROVIDER_ENV_BLOCKLIST)