diff --git a/project/ticket-022/README.md b/project/ticket-022/README.md
new file mode 100644
index 0000000..5f8ee69
--- /dev/null
+++ b/project/ticket-022/README.md
@@ -0,0 +1,27 @@
+# Ticket 022: Support TestTOON files in INCLUDE command
+
+- **ID**: ticket-022
+- **Owner**: agent:antigravity
+- **Status**: IN_PROGRESS
+- **Workflow state**: EDIT
+- **Created**: 2026-10-02
+
+## Goal and scope
+
+Allow the `INCLUDE` command to parse included TestTOON scenarios (`.testql.toon.yaml`)
+using the interpreter's format detection (`self.parse(...)`) instead of assuming
+legacy OQL syntax (`parse_oql`).
+
+## Acceptance criteria
+
+- [ ] AC-01: `INCLUDE` command parses TestTOON files through `self.parse(...)` instead of hardcoding `parse_oql`.
+- [ ] AC-02: Unit test `tests/test_include_testtoon.py` passes.
+- [ ] AC-03: Governance checks pass.
+
+## Authorization
+
+SESSION_EXECUTION_AUTHORIZATION: User requested sequential testing of all functionalities with testql, fixing the library directly if GUI testing fails, and merging the changes.
+
+## Evidence boundary
+
+Operational test receipts and browser execution logs remain local state.
diff --git a/project/ticket-022/intent.json b/project/ticket-022/intent.json
new file mode 100644
index 0000000..54610c0
--- /dev/null
+++ b/project/ticket-022/intent.json
@@ -0,0 +1,85 @@
+{
+  "schema": "new-project.intent/v3",
+  "ticket": "ticket-022",
+  "summary": "Support TestTOON files in INCLUDE command",
+  "workstream": "core",
+  "classification": {
+    "kind": "BUG",
+    "priority": "P1",
+    "origin": "regression"
+  },
+  "allowedPaths": [
+    "project/ticket-022/**",
+    "TODO.md",
+    "project/TICKETS.md",
+    "testql/interpreter/_flow.py",
+    "tests/test_include_testtoon.py"
+  ],
+  "forbiddenPaths": [
+    "project/ticket-*/user-*.md"
+  ],
+  "stacks": [
+    "python"
+  ],
+  "dependsOn": [
+    "ticket-021"
+  ],
+  "conflictsWith": [],
+  "integrationTicket": null,
+  "delivery": {
+    "acceptedBaseSha": "d609382cb3a2933ee5cf69b8af4e1b0552314587",
+    "targetBranch": "main",
+    "outcome": "Allow the INCLUDE command to parse included TestTOON scenarios (.testql.toon.yaml) using the interpreter's format detection instead of assuming legacy OQL syntax.",
+    "nonGoals": [
+      "No changes to circular include detection",
+      "No changes to include paths resolution"
+    ],
+    "complexity": "XS",
+    "estimatedMinutes": 10,
+    "budgets": {
+      "maxImplementationFiles": 2,
+      "maxAffectedComponents": 1,
+      "maxPublicInterfaceChanges": 0,
+      "maxRuntimeDependencies": 0
+    },
+    "architecture": {
+      "status": "accepted",
+      "decision": "Use self.parse(source, filename=rel_path) in _cmd_include to parse both TestTOON and OQL included scripts.",
+      "components": [
+        {
+          "name": "flow-include",
+          "paths": [
+            "testql/interpreter/_flow.py",
+            "tests/test_include_testtoon.py"
+          ]
+        }
+      ],
+      "responsibilityChanges": false,
+      "interfaceChanges": [],
+      "dataChanges": [],
+      "ui": {
+        "impact": "none",
+        "states": [],
+        "evidence": []
+      },
+      "rollback": "Revert the _cmd_include parser call."
+    },
+    "runtimeDependencies": [],
+    "validation": [
+      {
+        "criterion": "AC-01",
+        "commands": [
+          "pytest tests/test_include_testtoon.py"
+        ],
+        "evidence": "Included TestTOON files are parsed and dispatched as OQL lines."
+      },
+      {
+        "criterion": "AC-02",
+        "commands": [
+          "bash project/governance-check.sh --actor agent"
+        ],
+        "evidence": "Governance check passes."
+      }
+    ]
+  }
+}
diff --git a/testql/interpreter/_flow.py b/testql/interpreter/_flow.py
index 736c85b..406d76d 100644
--- a/testql/interpreter/_flow.py
+++ b/testql/interpreter/_flow.py
@@ -133,7 +133,10 @@ def _cmd_include(self, args: str, line: OqlLine) -> None:
         self._included.add(abs_path)
         self.out.step("📎", f"INCLUDE {rel_path}")
         source = resolved.read_text(encoding="utf-8")
-        sub_script: OqlScript = parse_oql(source, filename=rel_path)
+        if hasattr(self, "parse"):
+            sub_script: OqlScript = self.parse(source, filename=rel_path)
+        else:
+            sub_script = parse_oql(source, filename=rel_path)
         for sub_line in sub_script.lines:
             sub_args = self.vars.interpolate(sub_line.args)
             try:
diff --git a/tests/test_include_testtoon.py b/tests/test_include_testtoon.py
new file mode 100644
index 0000000..fca2e96
--- /dev/null
+++ b/tests/test_include_testtoon.py
@@ -0,0 +1,36 @@
+"""Unit tests for including TestTOON scenarios via INCLUDE."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from testql.interpreter import OqlInterpreter
+from testql.interpreter._parser import OqlLine
+
+
+def test_cmd_include_parses_testtoon_scenario(tmp_path: Path) -> None:
+    """INCLUDE command should auto-detect and parse .testql.toon.yaml files."""
+    sub_file = tmp_path / "sub.testql.toon.yaml"
+    sub_file.write_text(
+        """# SUB SCENARIO
+CONFIG[1]{key, value}:
+  my_var,  "hello_include"
+
+API[1]{method, endpoint, status}:
+  GET,  /test,  200
+""",
+        encoding="utf-8",
+    )
+
+    interp = OqlInterpreter(
+        api_url="http://localhost:8100",
+        dry_run=True,
+        quiet=True,
+        include_paths=[str(tmp_path)],
+    )
+
+    line = OqlLine(number=1, command="INCLUDE", args=f'"{sub_file.name}"', raw=f'INCLUDE "{sub_file.name}"')
+    interp._cmd_include(line.args, line)
+
+    assert interp.vars.get("my_var") == "hello_include"
+    assert len(interp.errors) == 0