fix: correct capa/subscope-rule key in RuleMetadata.from_capa

`RuleMetadata.from_capa` used `rule.meta.get("capa/subscope", False)` and
`Field(False, alias="capa/subscope")`, but the actual key set by
`_extract_subscope_rules_rec` is `"capa/subscope-rule"`. This caused
`is_subscope_rule` to always be `False` in every `RuleMetadata` instance,
making downstream filters in `render/utils.py`, `render/vverbose.py`, and
`scripts/import-to-ida.py` ineffective (though subscope rules are already
excluded from `ResultDocument` before reaching those callers).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -11,6 +11,7 @@
 -
 
 ### Bug Fixes
+- fix: correct capa/subscope-rule key in RuleMetadata so is_subscope_rule is no longer always False @williballenthin
 - fix: remove unreachable backports.functools_lru_cache fallback and dead dependency @williballenthin
 - fix: add missing ELF branch in get_format_from_extension for .elf_ files @williballenthin #3031
 - fix: Scopes.from_dict uses cls instead of self so subclasses return the correct type @williballenthin

capa/render/result_document.py

@@ -658,7 +658,7 @@ class RuleMetadata(FrozenModel):
     description: str
 
     lib: bool = Field(False, alias="lib")
-    is_subscope_rule: bool = Field(False, alias="capa/subscope")
+    is_subscope_rule: bool = Field(False, alias="capa/subscope-rule")
     maec: MaecMetadata
 
     @classmethod
@@ -674,7 +674,7 @@ class RuleMetadata(FrozenModel):
             examples=rule.meta.get("examples", []),
             description=rule.meta.get("description", ""),
             lib=rule.meta.get("lib", False),
-            is_subscope_rule=rule.meta.get("capa/subscope", False),
+            is_subscope_rule=rule.meta.get("capa/subscope-rule", False),
             maec=MaecMetadata(
                 analysis_conclusion=rule.meta.get("maec/analysis-conclusion"),
                 analysis_conclusion_ov=rule.meta.get("maec/analysis-conclusion-ov"),

tests/test_result_document.py

@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import copy
+import textwrap
 
 import pytest
 import fixtures
 
 import capa
+import capa.rules
 import capa.engine as ceng
 import capa.render.result_document as rdoc
 import capa.features.freeze.features as frzf
@@ -291,3 +293,30 @@ def test_rdoc_to_capa():
     meta, capabilites = rd.to_capa()
     assert isinstance(meta, rdoc.Metadata)
     assert isinstance(capabilites, Capabilities)
+
+
+def test_rule_metadata_is_subscope_rule_alias():
+    rule = capa.rules.Rule.from_yaml(
+        textwrap.dedent("""
+            rule:
+                meta:
+                    name: test rule
+                    scopes:
+                        static: function
+                        dynamic: process
+                    authors:
+                        - test
+                features:
+                    - api: CreateFile
+        """)
+    )
+    meta = rdoc.RuleMetadata.from_capa(rule)
+    assert meta.is_subscope_rule is False
+
+    raw = meta.model_dump(by_alias=True)
+    assert "capa/subscope-rule" in raw
+    assert raw["capa/subscope-rule"] is False
+
+    raw["capa/subscope-rule"] = True
+    meta_true = rdoc.RuleMetadata.model_validate(raw)
+    assert meta_true.is_subscope_rule is True