diff --git a/src/code_path_audit.py b/src/code_path_audit.py
index a1682dca..fc68bd0b 100644
--- a/src/code_path_audit.py
+++ b/src/code_path_audit.py
@@ -9,7 +9,7 @@ postfix DSL + markdown + prefix tree text. See
 conductor/tracks/code_path_audit_20260607/spec_v2.md.
 """
 from __future__ import annotations
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Literal
 
 AggregateKind = Literal[
@@ -59,4 +59,90 @@ class FunctionRef:
  fqname: str
  file: str
  line: int
- role: str
\ No newline at end of file
+ role: str
+
+@dataclass(frozen=True)
+class AccessPatternEvidence:
+ function: FunctionRef
+ pattern: AccessPattern
+ field_accesses: dict[str, int]
+ confidence: str
+
+@dataclass(frozen=True)
+class FrequencyEvidence:
+ function: FunctionRef
+ frequency: Frequency
+ source: str
+ note: str = ""
+
+@dataclass(frozen=True)
+class ResultCoverage:
+ total_producers: int
+ result_producers: int
+ total_consumers: int
+ result_consumers: int
+ summary: str
+
+@dataclass(frozen=True)
+class TypeAliasCoverage:
+ total_sites: int
+ typed_sites: int
+ untyped_sites: int
+ summary: str
+
+@dataclass(frozen=True)
+class CrossAuditFinding:
+ audit_script: str
+ site_count: int
+ example_file: str
+ example_line: int
+ note: str = ""
+
+@dataclass(frozen=True)
+class CrossAuditFindings:
+ weak_types: tuple[CrossAuditFinding, ...]
+ exception_handling: tuple[CrossAuditFinding, ...]
+ optional_in_baseline: tuple[CrossAuditFinding, ...]
+ config_io_ownership: tuple[CrossAuditFinding, ...]
+ import_graph: tuple[CrossAuditFinding, ...]
+
+@dataclass(frozen=True)
+class DecompositionCost:
+ current_cost_estimate: int
+ componentize_savings: int
+ unify_savings: int
+ recommended_direction: RecommendedDirection
+ recommended_rationale: str
+ batch_size: int | None
+ struct_field_count: int
+ struct_frozen: bool
+
+@dataclass(frozen=True)
+class OptimizationCandidate:
+ candidate: str
+ direction: RecommendedDirection
+ affected_files: tuple[str, ...]
+ estimated_savings_us: int
+ effort: str
+ priority: str
+ cross_ref: str = ""
+
+@dataclass(frozen=True)
+class AggregateProfile:
+ name: str
+ aggregate_kind: AggregateKind
+ memory_dim: MemoryDim
+ producers: tuple[FunctionRef, ...]
+ consumers: tuple[FunctionRef, ...]
+ access_pattern: AccessPattern
+ access_pattern_evidence: tuple[AccessPatternEvidence, ...]
+ frequency: Frequency
+ frequency_evidence: tuple[FrequencyEvidence, ...]
+ result_coverage: ResultCoverage
+ type_alias_coverage: TypeAliasCoverage
+ cross_audit_findings: CrossAuditFindings
+ decomposition_cost: DecompositionCost
+ optimization_candidates: tuple[OptimizationCandidate, ...]
+ is_candidate: bool
+ mermaid: str = ""
+ markdown: str = ""
\ No newline at end of file
diff --git a/tests/test_code_path_audit.py b/tests/test_code_path_audit.py
index 96ba1c8c..caaf9499 100644
--- a/tests/test_code_path_audit.py
+++ b/tests/test_code_path_audit.py
@@ -8,6 +8,15 @@ from src.code_path_audit import (
  Frequency,
  RecommendedDirection,
  FunctionRef,
+ AccessPatternEvidence,
+ FrequencyEvidence,
+ ResultCoverage,
+ TypeAliasCoverage,
+ CrossAuditFinding,
+ CrossAuditFindings,
+ DecompositionCost,
+ OptimizationCandidate,
+ AggregateProfile,
 )
 
 def test_aggregate_kind_4_values() -> None:
@@ -58,4 +67,207 @@ def test_function_ref_frozen() -> None:
  )
  with pytest.raises((AttributeError, Exception)) as exc_info:
   ref.fqname = "src.z.w"
- assert "frozen" in str(exc_info.value).lower() or "cannot assign" in str(exc_info.value).lower()
\ No newline at end of file
+ assert "frozen" in str(exc_info.value).lower() or "cannot assign" in str(exc_info.value).lower()
+
+def test_access_pattern_evidence_4_fields() -> None:
+ """AccessPatternEvidence has function, pattern, field_accesses, confidence."""
+ ref = FunctionRef(fqname="src.x.y", file="src/x.py", line=1, role="consumer")
+ ev = AccessPatternEvidence(
+ function=ref,
+ pattern="field_by_field",
+ field_accesses={"path": 3, "view_mode": 2},
+ confidence="high",
+ )
+ assert ev.function is ref
+ assert ev.pattern == "field_by_field"
+ assert ev.field_accesses == {"path": 3, "view_mode": 2}
+ assert ev.confidence == "high"
+
+def test_frequency_evidence_4_fields() -> None:
+ """FrequencyEvidence has function, frequency, source, note (default '')."""
+ ref = FunctionRef(fqname="src.x.y", file="src/x.py", line=1, role="both")
+ ev = FrequencyEvidence(
+ function=ref,
+ frequency="per_turn",
+ source="entry_point",
+ note="called per LLM turn",
+ )
+ assert ev.function is ref
+ assert ev.frequency == "per_turn"
+ assert ev.source == "entry_point"
+ assert ev.note == "called per LLM turn"
+
+def test_frequency_evidence_default_note() -> None:
+ """FrequencyEvidence.note defaults to ''."""
+ ref = FunctionRef(fqname="src.x.y", file="src/x.py", line=1, role="consumer")
+ ev = FrequencyEvidence(function=ref, frequency="cold", source="control_flow_position")
+ assert ev.note == ""
+
+def test_result_coverage_5_fields() -> None:
+ """ResultCoverage has total_producers, result_producers, total_consumers, result_consumers, summary."""
+ cov = ResultCoverage(
+ total_producers=12,
+ result_producers=5,
+ total_consumers=15,
+ result_consumers=8,
+ summary="5/12 producers return Result[T] (42%); 8/15 consumers branch on .errors (53%)",
+ )
+ assert cov.total_producers == 12
+ assert cov.result_producers == 5
+ assert cov.total_consumers == 15
+ assert cov.result_consumers == 8
+ assert "42%" in cov.summary
+ assert "53%" in cov.summary
+
+def test_type_alias_coverage_4_fields() -> None:
+ """TypeAliasCoverage has total_sites, typed_sites, untyped_sites, summary."""
+ cov = TypeAliasCoverage(
+ total_sites=45,
+ typed_sites=38,
+ untyped_sites=7,
+ summary="45 total sites; 38 typed (84%); 7 untyped (16%)",
+ )
+ assert cov.total_sites == 45
+ assert cov.typed_sites == 38
+ assert cov.untyped_sites == 7
+ assert "84%" in cov.summary
+ assert "16%" in cov.summary
+
+def test_cross_audit_finding_5_fields() -> None:
+ """CrossAuditFinding has audit_script, site_count, example_file, example_line, note (default '')."""
+ finding = CrossAuditFinding(
+ audit_script="audit_weak_types",
+ site_count=12,
+ example_file="src/ai_client.py",
+ example_line=100,
+ note="12 weak-type sites in producer+consumer functions",
+ )
+ assert finding.audit_script == "audit_weak_types"
+ assert finding.site_count == 12
+ assert finding.example_file == "src/ai_client.py"
+ assert finding.example_line == 100
+ assert finding.note == "12 weak-type sites in producer+consumer functions"
+
+def test_cross_audit_finding_default_note() -> None:
+ """CrossAuditFinding.note defaults to ''."""
+ finding = CrossAuditFinding(
+ audit_script="audit_optional_in_3_files",
+ site_count=0,
+ example_file="",
+ example_line=0,
+ )
+ assert finding.note == ""
+
+def test_cross_audit_findings_5_audit_scripts() -> None:
+ """CrossAuditFindings has 5 audit-script fields, each a tuple of CrossAuditFinding."""
+ findings = CrossAuditFindings(
+ weak_types=(),
+ exception_handling=(),
+ optional_in_baseline=(),
+ config_io_ownership=(),
+ import_graph=(),
+ )
+ assert findings.weak_types == ()
+ assert findings.exception_handling == ()
+ assert findings.optional_in_baseline == ()
+ assert findings.config_io_ownership == ()
+ assert findings.import_graph == ()
+
+def test_decomposition_cost_8_fields() -> None:
+ """DecompositionCost has 8 fields per spec."""
+ cost = DecompositionCost(
+ current_cost_estimate=1500,
+ componentize_savings=450,
+ unify_savings=0,
+ recommended_direction="hold",
+ recommended_rationale="whole_struct access on a frozen dataclass; current shape is correct",
+ batch_size=None,
+ struct_field_count=8,
+ struct_frozen=True,
+ )
+ assert cost.current_cost_estimate == 1500
+ assert cost.componentize_savings == 450
+ assert cost.unify_savings == 0
+ assert cost.recommended_direction == "hold"
+ assert "frozen" in cost.recommended_rationale
+ assert cost.batch_size is None
+ assert cost.struct_field_count == 8
+ assert cost.struct_frozen is True
+
+def test_optimization_candidate_7_fields() -> None:
+ """OptimizationCandidate has 7 fields per spec."""
+ cand = OptimizationCandidate(
+ candidate="Migrate 7 producers of Metadata to Result[Metadata]",
+ direction="componentize",
+ affected_files=("src/ai_client.py", "src/app_controller.py", "src/history.py"),
+ estimated_savings_us=500,
+ effort="small",
+ priority="high",
+ cross_ref="docs/reports/EXCEPTION_HANDLING_AUDIT_20260616.md",
+ )
+ assert "Migrate" in cand.candidate
+ assert cand.direction == "componentize"
+ assert len(cand.affected_files) == 3
+ assert cand.estimated_savings_us == 500
+ assert cand.effort == "small"
+ assert cand.priority == "high"
+ assert "EXCEPTION_HANDLING_AUDIT" in cand.cross_ref
+
+def test_aggregate_profile_14_fields() -> None:
+ """AggregateProfile has 14 top-level fields (per spec section 7.1)."""
+ f = FunctionRef(fqname="src.x.y", file="src/x.py", line=1, role="producer")
+ profile = AggregateProfile(
+ name="Metadata",
+ aggregate_kind="typealias",
+ memory_dim="discussion",
+ producers=(f,),
+ consumers=(f,),
+ access_pattern="field_by_field",
+ access_pattern_evidence=(AccessPatternEvidence(
+ function=f, pattern="field_by_field", field_accesses={"role": 3}, confidence="high"
+ ),),
+ frequency="per_turn",
+ frequency_evidence=(FrequencyEvidence(
+ function=f, frequency="per_turn", source="entry_point", note="per LLM turn"
+ ),),
+ result_coverage=ResultCoverage(0, 0, 0, 0, ""),
+ type_alias_coverage=TypeAliasCoverage(0, 0, 0, ""),
+ cross_audit_findings=CrossAuditFindings((), (), (), (), ()),
+ decomposition_cost=DecompositionCost(0, 0, 0, "hold", "no data", None, 0, False),
+ optimization_candidates=(),
+ is_candidate=False,
+ )
+ assert profile.name == "Metadata"
+ assert profile.aggregate_kind == "typealias"
+ assert profile.memory_dim == "discussion"
+ assert len(profile.producers) == 1
+ assert len(profile.consumers) == 1
+ assert profile.access_pattern == "field_by_field"
+ assert len(profile.access_pattern_evidence) == 1
+ assert profile.frequency == "per_turn"
+ assert len(profile.frequency_evidence) == 1
+ assert profile.is_candidate is False
+
+def test_aggregate_profile_is_candidate_true() -> None:
+ """AggregateProfile.is_candidate=True for the 3 candidate aggregates."""
+ profile = AggregateProfile(
+ name="ChatMessage",
+ aggregate_kind="candidate_dataclass",
+ memory_dim="discussion",
+ producers=(),
+ consumers=(),
+ access_pattern="mixed",
+ access_pattern_evidence=(),
+ frequency="unknown",
+ frequency_evidence=(),
+ result_coverage=ResultCoverage(0, 0, 0, 0, ""),
+ type_alias_coverage=TypeAliasCoverage(0, 0, 0, ""),
+ cross_audit_findings=CrossAuditFindings((), (), (), (), ()),
+ decomposition_cost=DecompositionCost(0, 0, 0, "insufficient_data", "candidate", None, 0, False),
+ optimization_candidates=(),
+ is_candidate=True,
+ )
+ assert profile.is_candidate is True
+ assert profile.aggregate_kind == "candidate_dataclass"
+ assert profile.producers == ()
+ assert profile.consumers == ()
\ No newline at end of file