diff --git a/tests/test_service.py b/tests/test_service.py
index 8d1395cf8..d86be5986 100644
--- a/tests/test_service.py
+++ b/tests/test_service.py
@@ -100,10 +100,40 @@ class TestEnvCollection:
 
     def test_includes_venv_in_path(self, monkeypatch, tmp_path):
         monkeypatch.setenv("_SOLSTONE_JOURNAL_OVERRIDE", str(tmp_path))
+        monkeypatch.setenv("PATH", "/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin")
+        monkeypatch.setattr(
+            sys, "executable", str(tmp_path / ".venv" / "bin" / "python")
+        )
 
         env = service._collect_env()
         venv_bin = str(Path(sys.executable).parent)
-        assert env["PATH"].startswith(venv_bin)
+        assert env["PATH"] == (
+            f"{venv_bin}:/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin"
+        )
+
+    def test_path_fallback_when_unset(self, monkeypatch, tmp_path):
+        monkeypatch.setenv("_SOLSTONE_JOURNAL_OVERRIDE", str(tmp_path))
+        monkeypatch.delenv("PATH", raising=False)
+        monkeypatch.setattr(
+            sys, "executable", str(tmp_path / ".venv" / "bin" / "python")
+        )
+
+        env = service._collect_env()
+        venv_bin = str(Path(sys.executable).parent)
+        assert env["PATH"] == f"{venv_bin}:/usr/local/bin:/usr/bin:/bin"
+
+    def test_path_deduplicates_venv_bin(self, monkeypatch, tmp_path):
+        monkeypatch.setenv("_SOLSTONE_JOURNAL_OVERRIDE", str(tmp_path))
+        monkeypatch.setattr(
+            sys, "executable", str(tmp_path / ".venv" / "bin" / "python")
+        )
+        venv_bin = str(Path(sys.executable).parent)
+        monkeypatch.setenv("PATH", f"{venv_bin}:/usr/local/bin:/usr/bin:/bin")
+
+        env = service._collect_env()
+        parts = env["PATH"].split(":")
+        assert parts[0] == venv_bin
+        assert parts.count(venv_bin) == 1
 
     def test_journal_override_not_propagated(self, monkeypatch, tmp_path):
         monkeypatch.setenv("_SOLSTONE_JOURNAL_OVERRIDE", str(tmp_path))
diff --git a/think/service.py b/think/service.py
index 617ea8d8c..41431b1d2 100644
--- a/think/service.py
+++ b/think/service.py
@@ -61,16 +61,20 @@ def _sol_bin() -> str:
 def _collect_env() -> dict[str, str]:
     """Collect environment variables for the service file.
 
-    Only captures HOME and PATH (with venv bin). API keys are NOT written
-    into service files — the supervisor reads them from journal.json at
-    process startup via setup_cli(). Never propagate _SOLSTONE_JOURNAL_OVERRIDE
+    Captures HOME and PATH (with venv bin prepended). The real PATH is read
+    from os.environ so installed services inherit the shell's tool visibility.
+    Falls back to /usr/local/bin:/usr/bin:/bin if PATH is unset. API keys are
+    NOT written into service files — the supervisor reads them from journal.json
+    at process startup via setup_cli(). Never propagate _SOLSTONE_JOURNAL_OVERRIDE
     into service files — installed services should use default path resolution.
     """
     venv_bin = str(Path(sys.executable).parent)
+    base_path = os.environ.get("PATH", "/usr/local/bin:/usr/bin:/bin")
+    path = ":".join(dict.fromkeys([venv_bin] + base_path.split(":")))
 
     return {
         "HOME": str(Path.home()),
-        "PATH": f"{venv_bin}:/usr/local/bin:/usr/bin:/bin",
+        "PATH": path,
     }