diff --git a/tests/scene_generator_modes_test.rs b/tests/scene_generator_modes_test.rs
new file mode 100644
index 0000000..98c1433
--- /dev/null
+++ b/tests/scene_generator_modes_test.rs
@@ -0,0 +1,318 @@
+use std::fs;
+use std::path::PathBuf;
+use std::time::{SystemTime, UNIX_EPOCH};
+
+use sgclaw::generated_scene::analyzer::SceneKind;
+use sgclaw::generated_scene::generator::{generate_scene_package, GenerateSceneRequest};
+use sgclaw::generated_scene::ir::{
+    ApiEndpointIr, ModeConditionIr, ModeIr, NormalizeRulesIr, SceneIdDiagnosticsIr, SceneIr,
+    WorkflowArchetype,
+};
+
+fn make_test_mode(
+    name: &str,
+    url: &str,
+    content_type: Option<&str>,
+    response_path: &str,
+) -> ModeIr {
+    ModeIr {
+        name: name.to_string(),
+        label: Some(name.to_string()),
+        condition: Some(ModeConditionIr {
+            field: "period_mode".to_string(),
+            operator: "equals".to_string(),
+            value: serde_json::Value::String(name.to_string()),
+        }),
+        api_endpoint: Some(ApiEndpointIr {
+            name: format!("{}_endpoint", name),
+            url: url.to_string(),
+            method: "POST".to_string(),
+            content_type: content_type.map(|s| s.to_string()),
+            description: None,
+        }),
+        column_defs: vec![("id".to_string(), "ID".to_string())],
+        request_template: serde_json::json!({}),
+        normalize_rules: Some(NormalizeRulesIr {
+            rules_type: "validate_required".to_string(),
+            required_fields: vec!["id".to_string()],
+            filter_null: true,
+        }),
+        response_path: response_path.to_string(),
+    }
+}
+
+fn make_test_scene_ir(modes: Vec<ModeIr>) -> SceneIr {
+    let is_multi = modes.len() > 1;
+    SceneIr {
+        scene_id: "test-scene".to_string(),
+        scene_id_diagnostics: SceneIdDiagnosticsIr::default(),
+        scene_name: "Test Scene".to_string(),
+        scene_kind: "report_collection".to_string(),
+        workflow_archetype: Some(if is_multi {
+            WorkflowArchetype::MultiModeRequest
+        } else {
+            WorkflowArchetype::SingleRequestTable
+        }),
+        bootstrap: Default::default(),
+        params: Vec::new(),
+        modes,
+        default_mode: Some("month".to_string()),
+        mode_switch_field: Some("period_mode".to_string()),
+        workflow_steps: vec![
+            sgclaw::generated_scene::ir::WorkflowStepIr {
+                step_type: "request".to_string(),
+                description: Some("select mode and query corresponding endpoint".to_string()),
+                ..Default::default()
+            },
+            sgclaw::generated_scene::ir::WorkflowStepIr {
+                step_type: "transform".to_string(),
+                description: Some("normalize mode-specific table rows".to_string()),
+                ..Default::default()
+            },
+        ],
+        workflow_evidence: Default::default(),
+        request_template: serde_json::Value::Null,
+        response_path: "".to_string(),
+        normalize_rules: None,
+        artifact_contract: Default::default(),
+        validation_hints: Default::default(),
+        evidence: Vec::new(),
+        readiness: Default::default(),
+        api_endpoints: Vec::new(),
+        static_params: Default::default(),
+        column_defs: Vec::new(),
+        confidence: 0.0,
+        uncertainties: Vec::new(),
+    }
+}
+
+fn temp_workspace(prefix: &str) -> PathBuf {
+    let nanos = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+    let path = std::env::temp_dir().join(format!("{prefix}-{nanos}"));
+    fs::create_dir_all(&path).unwrap();
+    path
+}
+
+/// Test 1: Single mode generates MODES array (routes through compile_multi_mode_request)
+#[test]
+fn test_single_mode_generates_modes_array() {
+    let output_root = temp_workspace("sgclaw-single-mode-test");
+    let modes = vec![make_test_mode(
+        "month",
+        "http://example.com/api/month",
+        None,
+        "data",
+    )];
+    let scene_ir = make_test_scene_ir(modes);
+
+    // Use SingleRequestTable archetype - the compile path should auto-wrap into multi-mode
+    let mut scene_ir = scene_ir;
+    scene_ir.workflow_archetype = Some(WorkflowArchetype::SingleRequestTable);
+    // Provide one api_endpoint so ensure_modes_populated works
+    scene_ir.api_endpoints = vec![ApiEndpointIr {
+        name: "default_endpoint".to_string(),
+        url: "http://example.com/api/data".to_string(),
+        method: "POST".to_string(),
+        content_type: None,
+        description: None,
+    }];
+
+    generate_scene_package(GenerateSceneRequest {
+        source_dir: PathBuf::from("tests/fixtures/generated_scene/report_collection"),
+        scene_id: "single-mode-scene".to_string(),
+        scene_name: "Single Mode Scene".to_string(),
+        scene_kind: Some(SceneKind::ReportCollection),
+        target_url: None,
+        output_root: output_root.clone(),
+        lessons_path: None,
+        scene_info_json: None,
+        scene_ir_json: Some(scene_ir),
+    })
+    .unwrap();
+
+    let skill_root = output_root.join("skills/single-mode-scene");
+    let generated_script =
+        fs::read_to_string(skill_root.join("scripts/collect_single_mode_scene.js")).unwrap();
+
+    assert!(
+        generated_script.contains("const MODES ="),
+        "Generated JS should contain 'const MODES =' since SingleRequestTable routes through compile_multi_mode_request"
+    );
+}
+
+/// Test 2: Multi-mode generates mode routing (detectMode and MODES.find)
+#[test]
+fn test_multi_mode_generates_mode_routing() {
+    let output_root = temp_workspace("sgclaw-multi-mode-test");
+    let modes = vec![
+        make_test_mode(
+            "month",
+            "http://example.com/api/month",
+            None,
+            "data",
+        ),
+        make_test_mode(
+            "week",
+            "http://example.com/api/week",
+            None,
+            "data",
+        ),
+    ];
+    let scene_ir = make_test_scene_ir(modes);
+
+    generate_scene_package(GenerateSceneRequest {
+        source_dir: PathBuf::from("tests/fixtures/generated_scene/report_collection"),
+        scene_id: "multi-mode-scene".to_string(),
+        scene_name: "Multi Mode Scene".to_string(),
+        scene_kind: Some(SceneKind::ReportCollection),
+        target_url: None,
+        output_root: output_root.clone(),
+        lessons_path: None,
+        scene_info_json: None,
+        scene_ir_json: Some(scene_ir),
+    })
+    .unwrap();
+
+    let skill_root = output_root.join("skills/multi-mode-scene");
+    let generated_script =
+        fs::read_to_string(skill_root.join("scripts/collect_multi_mode_scene.js")).unwrap();
+
+    assert!(
+        generated_script.contains("function detectMode"),
+        "Generated JS should contain 'detectMode' function for multi-mode routing"
+    );
+    assert!(
+        generated_script.contains("MODES.find"),
+        "Generated JS should contain 'MODES.find' for mode selection"
+    );
+}
+
+/// Test 3: Form-urlencoded request body uses Object.entries().join('&') not JSON.stringify
+#[test]
+fn test_form_urlencoded_request_body() {
+    let output_root = temp_workspace("sgclaw-form-urlencoded-test");
+    let modes = vec![make_test_mode(
+        "month",
+        "http://example.com/api/month",
+        Some("application/x-www-form-urlencoded"),
+        "data",
+    )];
+    let scene_ir = make_test_scene_ir(modes);
+
+    generate_scene_package(GenerateSceneRequest {
+        source_dir: PathBuf::from("tests/fixtures/generated_scene/report_collection"),
+        scene_id: "form-urlencoded-scene".to_string(),
+        scene_name: "Form URL Encoded Scene".to_string(),
+        scene_kind: Some(SceneKind::ReportCollection),
+        target_url: None,
+        output_root: output_root.clone(),
+        lessons_path: None,
+        scene_info_json: None,
+        scene_ir_json: Some(scene_ir),
+    })
+    .unwrap();
+
+    let skill_root = output_root.join("skills/form-urlencoded-scene");
+    let generated_script =
+        fs::read_to_string(skill_root.join("scripts/collect_form_urlencoded_scene.js")).unwrap();
+
+    // The buildModeRequest function should use Object.entries for form-urlencoded
+    assert!(
+        generated_script.contains("Object.entries(requestBody)"),
+        "Generated JS should use Object.entries for form-urlencoded body encoding"
+    );
+    assert!(
+        generated_script.contains(".join('&')"),
+        "Generated JS should join form-urlencoded entries with '&'"
+    );
+    // Verify the conditional exists in buildModeRequest
+    assert!(
+        generated_script.contains("application/x-www-form-urlencoded"),
+        "Generated JS should reference form-urlencoded content type"
+    );
+}
+
+/// Test 4: Response path extraction uses mode.responsePath in the template
+#[test]
+fn test_response_path_extraction_in_template() {
+    let output_root = temp_workspace("sgclaw-response-path-test");
+    let modes = vec![make_test_mode(
+        "month",
+        "http://example.com/api/month",
+        None,
+        "data.list",
+    )];
+    let scene_ir = make_test_scene_ir(modes);
+
+    generate_scene_package(GenerateSceneRequest {
+        source_dir: PathBuf::from("tests/fixtures/generated_scene/report_collection"),
+        scene_id: "response-path-scene".to_string(),
+        scene_name: "Response Path Scene".to_string(),
+        scene_kind: Some(SceneKind::ReportCollection),
+        target_url: None,
+        output_root: output_root.clone(),
+        lessons_path: None,
+        scene_info_json: None,
+        scene_ir_json: Some(scene_ir),
+    })
+    .unwrap();
+
+    let skill_root = output_root.join("skills/response-path-scene");
+    let generated_script =
+        fs::read_to_string(skill_root.join("scripts/collect_response_path_scene.js")).unwrap();
+
+    // The multi-mode template uses mode.responsePath for response extraction
+    assert!(
+        generated_script.contains("mode.responsePath"),
+        "Generated JS should use 'mode.responsePath' for per-mode response extraction"
+    );
+    // The safeGet call should reference the mode's responsePath
+    assert!(
+        generated_script.contains("safeGet(raw, mode.responsePath"),
+        "Generated JS should call safeGet with mode.responsePath"
+    );
+}
+
+/// Test 5: processData flag in $.ajax call with correct conditional
+#[test]
+fn test_process_data_flag_in_ajax() {
+    let output_root = temp_workspace("sgclaw-process-data-test");
+    let modes = vec![make_test_mode(
+        "month",
+        "http://example.com/api/month",
+        Some("application/x-www-form-urlencoded"),
+        "data",
+    )];
+    let scene_ir = make_test_scene_ir(modes);
+
+    generate_scene_package(GenerateSceneRequest {
+        source_dir: PathBuf::from("tests/fixtures/generated_scene/report_collection"),
+        scene_id: "process-data-scene".to_string(),
+        scene_name: "Process Data Scene".to_string(),
+        scene_kind: Some(SceneKind::ReportCollection),
+        target_url: None,
+        output_root: output_root.clone(),
+        lessons_path: None,
+        scene_info_json: None,
+        scene_ir_json: Some(scene_ir),
+    })
+    .unwrap();
+
+    let skill_root = output_root.join("skills/process-data-scene");
+    let generated_script =
+        fs::read_to_string(skill_root.join("scripts/collect_process_data_scene.js")).unwrap();
+
+    // The $.ajax call should contain processData flag
+    assert!(
+        generated_script.contains("processData:"),
+        "Generated JS $.ajax call should contain 'processData:' flag"
+    );
+    // processData should be false for form-urlencoded (negated condition)
+    assert!(
+        generated_script.contains("processData: request.headers['Content-Type'] !== 'application/x-www-form-urlencoded'"),
+        "Generated JS should set processData to false for form-urlencoded content type"
+    );
+}