diff --git a/generate/__init__.py b/generate/__init__.py
index 0f426560..869ab987 100644
--- a/generate/__init__.py
+++ b/generate/__init__.py
@@ -1 +1,18 @@
+from .proposition import (
+    FrameRegistry,
+    FrameSlot,
+    Proposition,
+    PropositionFrame,
+    propose,
+)
 from .stream import generate, agenerate
+
+__all__ = [
+    "FrameRegistry",
+    "FrameSlot",
+    "Proposition",
+    "PropositionFrame",
+    "agenerate",
+    "generate",
+    "propose",
+]
diff --git a/generate/proposition.py b/generate/proposition.py
new file mode 100644
index 00000000..3e5c585d
--- /dev/null
+++ b/generate/proposition.py
@@ -0,0 +1,333 @@
+"""
+Structured proposition generation.
+
+A proposition is the first structured assertion above the surface walk:
+prompt and field form a grade-2 relation blade; a frame is selected by exact
+CGA inner product against that relation; vocabulary points then instantiate
+the frame slots.
+
+No normalization happens here. This module consumes already-closed field and
+vocabulary versors and uses only outer_product() plus cga_inner() for relation
+and distance.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+import json
+from pathlib import Path
+from typing import Iterable
+
+import numpy as np
+
+from algebra.cga import cga_inner, outer_product
+from field.state import FieldState
+from generate.stream import _articulate
+
+_PROJECT_ROOT = Path(__file__).resolve().parents[1]
+_STOP_SURFACES = frozenset({"what", "who", "how", "why", "when", "which", "it", "to"})
+
+
+@dataclass(frozen=True, slots=True)
+class FrameSlot:
+    name: str
+    required: bool
+    semantic_role: str | None = None
+    agreement_target: str | None = None
+
+
+@dataclass(frozen=True, slots=True)
+class PropositionFrame:
+    frame_id: str
+    language: str
+    predicate_type: str
+    slots: tuple[FrameSlot, ...]
+    constraints: tuple[str, ...] = field(default_factory=tuple)
+    relation: np.ndarray = field(default_factory=lambda: np.zeros(32, dtype=np.float32))
+
+    def __post_init__(self) -> None:
+        object.__setattr__(self, "slots", tuple(self.slots))
+        object.__setattr__(self, "constraints", tuple(self.constraints))
+        object.__setattr__(self, "relation", np.asarray(self.relation, dtype=np.float32).copy())
+
+
+@dataclass(frozen=True, slots=True)
+class Proposition:
+    subject: str
+    predicate: str
+    object_: str | None
+    surface: str
+    frame_id: str
+    subject_versor: np.ndarray
+    predicate_versor: np.ndarray
+    object_versor: np.ndarray | None = None
+    relation: np.ndarray = field(default_factory=lambda: np.zeros(32, dtype=np.float32))
+
+    def __post_init__(self) -> None:
+        subject_versor = np.asarray(self.subject_versor, dtype=np.float32).copy()
+        predicate_versor = np.asarray(self.predicate_versor, dtype=np.float32).copy()
+        object.__setattr__(self, "subject_versor", subject_versor)
+        object.__setattr__(self, "predicate_versor", predicate_versor)
+        if self.object_versor is not None:
+            object_versor = np.asarray(self.object_versor, dtype=np.float32).copy()
+            object.__setattr__(self, "object_versor", object_versor)
+        object.__setattr__(self, "relation", np.asarray(self.relation, dtype=np.float32).copy())
+
+
+class FrameRegistry:
+    """Exact frame selection over precompiled frame relation blades."""
+
+    def __init__(self, frames: Iterable[PropositionFrame]) -> None:
+        self._frames = tuple(frames)
+        if not self._frames:
+            raise ValueError("FrameRegistry requires at least one frame.")
+
+    @classmethod
+    def from_pack(cls, pack: str, vocab) -> "FrameRegistry":
+        """
+        Load frames from packs/<pack>/frames.jsonl.
+
+        The shipped Koine directory is named both `el` and `grc` in different
+        layers; this accepts either spelling and reads the project pack files.
+        """
+        pack_dir = _PROJECT_ROOT / "packs" / pack
+        if not pack_dir.exists() and pack == "el":
+            pack_dir = _PROJECT_ROOT / "packs" / "grc"
+        if not pack_dir.exists() and pack == "grc":
+            pack_dir = _PROJECT_ROOT / "packs" / "el"
+        return cls.from_jsonl(pack_dir / "frames.jsonl", vocab)
+
+    @classmethod
+    def from_jsonl(cls, path: str | Path, vocab) -> "FrameRegistry":
+        path = Path(path)
+        frames: list[PropositionFrame] = []
+        for line in path.read_text(encoding="utf-8").splitlines():
+            if not line.strip():
+                continue
+            payload = json.loads(line)
+            frame = _parse_frame(payload, vocab)
+            frames.append(frame)
+        return cls(frames)
+
+    def select(self, relation: np.ndarray) -> PropositionFrame:
+        relation = np.asarray(relation, dtype=np.float32)
+        return max(self._frames, key=lambda frame: cga_inner(relation, frame.relation))
+
+    def __iter__(self):
+        return iter(self._frames)
+
+    def __len__(self) -> int:
+        return len(self._frames)
+
+
+def propose(field_state: FieldState, vault, vocab, frame_registry: FrameRegistry) -> Proposition:
+    """
+    Generate one structured proposition from the live field.
+
+    The prompt field is `holonomy` when injection supplied it; otherwise the
+    current field is used. The selected subject is nearest the prompt. The
+    predicate is nearest the current field with the subject and trivial stop
+    wells excluded. The resulting proposition can be stored directly in the
+    vault metadata while its `surface` remains the emitted text.
+    """
+    prompt = _prompt_versor(field_state)
+    relation = outer_product(prompt, field_state.F)
+    frame = frame_registry.select(relation)
+
+    subject_word, subject_idx = _nearest_content_word(
+        vocab,
+        prompt,
+        exclude_indices=frozenset(),
+        preferred_pos=frozenset({"noun", "pronoun"}),
+    )
+    predicate_word, predicate_idx = _nearest_content_word(
+        vocab,
+        field_state.F,
+        exclude_indices=frozenset({subject_idx}),
+    )
+
+    object_word: str | None = None
+    object_versor: np.ndarray | None = None
+    if _frame_wants_object(frame):
+        object_word, object_idx = _nearest_content_word(
+            vocab,
+            relation,
+            exclude_indices=frozenset({subject_idx, predicate_idx}),
+            preferred_pos=frozenset({"noun", "pronoun"}),
+        )
+        object_versor = vocab.get_versor_at(object_idx)
+
+    subject = _articulate(vocab, subject_word)
+    predicate = _articulate(vocab, predicate_word)
+    object_surface = _articulate(vocab, object_word) if object_word is not None else None
+    surface = _render_surface(frame, subject, predicate, object_surface)
+
+    proposition = Proposition(
+        subject=subject,
+        predicate=predicate,
+        object_=object_surface,
+        surface=surface,
+        frame_id=frame.frame_id,
+        subject_versor=vocab.get_versor_at(subject_idx),
+        predicate_versor=vocab.get_versor_at(predicate_idx),
+        object_versor=object_versor,
+        relation=relation,
+    )
+    if vault is not None:
+        vault.store(field_state.F, {"kind": "proposition", "proposition": proposition})
+    return proposition
+
+
+def _parse_frame(payload: dict, vocab) -> PropositionFrame:
+    slots = tuple(
+        FrameSlot(
+            name=slot["name"],
+            required=bool(slot["required"]),
+            semantic_role=slot.get("semantic_role"),
+            agreement_target=slot.get("agreement_target"),
+        )
+        for slot in payload.get("slots", ())
+    )
+    relation = _frame_relation(payload, vocab)
+    return PropositionFrame(
+        frame_id=payload["frame_id"],
+        language=payload["language"],
+        predicate_type=payload["predicate_type"],
+        slots=slots,
+        constraints=tuple(payload.get("constraints", ())),
+        relation=relation,
+    )
+
+
+def _frame_relation(payload: dict, vocab) -> np.ndarray:
+    left = _first_existing(vocab, _role_anchor_candidates(payload))
+    right = _first_existing(vocab, _predicate_anchor_candidates(payload))
+    if left is None or right is None:
+        left = vocab.get_word_at(0)
+        right = vocab.get_word_at(1 if len(vocab) > 1 else 0)
+    return outer_product(vocab.get_versor(left), vocab.get_versor(right))
+
+
+def _role_anchor_candidates(payload: dict) -> tuple[str, ...]:
+    text = " ".join(
+        [payload.get("predicate_type", "")]
+        + [
+            " ".join(str(slot.get(k, "")) for k in ("name", "semantic_role"))
+            for slot in payload.get("slots", ())
+        ]
+    ).lower()
+    if "creation" in text or "agent" in text:
+        return ("create", "κτίζω", "ברא", "λόγος", "דבר", "word")
+    if "pros" in text or "direction" in text or "accompan" in text:
+        return ("with", "λόγος", "דבר", "word")
+    return (
+        "light",
+        "φῶς",
+        "אוֹר",
+        "אור",
+        "truth",
+        "ἀλήθεια",
+        "אמת",
+        "word",
+        "λόγος",
+        "דבר",
+    )
+
+
+def _predicate_anchor_candidates(payload: dict) -> tuple[str, ...]:
+    predicate_type = payload.get("predicate_type", "").lower()
+    if "existential" in predicate_type:
+        return ("exist", "is", "was", "ζωή", "חיים")
+    if "relational" in predicate_type or "prepositional" in predicate_type:
+        return ("with", "to", "λόγος", "דבר")
+    if "creation" in predicate_type or "verbal" in predicate_type:
+        return ("create", "κτίζω", "ברא")
+    return ("is", "was", "true", "real", "ἀλήθεια", "אמת", "truth")
+
+
+def _first_existing(vocab, candidates: tuple[str, ...]) -> str | None:
+    for candidate in candidates:
+        try:
+            vocab.get_versor(candidate)
+        except KeyError:
+            continue
+        return candidate
+    return None
+
+
+def _prompt_versor(field_state: FieldState) -> np.ndarray:
+    return field_state.holonomy if field_state.holonomy is not None else field_state.F
+
+
+def _nearest_content_word(
+    vocab,
+    query: np.ndarray,
+    exclude_indices: frozenset[int],
+    preferred_pos: frozenset[str] = frozenset(),
+) -> tuple[str, int]:
+    stop_indices = {
+        vocab.index_of(surface)
+        for surface in _STOP_SURFACES
+        if _has_word(vocab, surface)
+    }
+    blocked = set(exclude_indices) | stop_indices
+    if preferred_pos:
+        selected = _nearest_by_pos(vocab, query, blocked, preferred_pos)
+        if selected is not None:
+            return selected
+    try:
+        return vocab.nearest(query, exclude_indices=blocked)
+    except ValueError:
+        return vocab.nearest(query, exclude_indices=set(exclude_indices))
+
+
+def _nearest_by_pos(
+    vocab,
+    query: np.ndarray,
+    blocked: set[int],
+    preferred_pos: frozenset[str],
+) -> tuple[str, int] | None:
+    best_score = -np.inf
+    best: tuple[str, int] | None = None
+    for idx in range(len(vocab)):
+        if idx in blocked:
+            continue
+        word = vocab.get_word_at(idx)
+        morphology_for_word = getattr(vocab, "morphology_for_word", None)
+        morphology = morphology_for_word(word) if morphology_for_word is not None else None
+        pos = None if morphology is None else dict(morphology.inflection).get("pos")
+        if pos not in preferred_pos:
+            continue
+        score = cga_inner(query, vocab.get_versor_at(idx))
+        if score > best_score:
+            best_score = score
+            best = (word, idx)
+    return best
+
+
+def _has_word(vocab, word: str) -> bool:
+    try:
+        vocab.index_of(word)
+    except KeyError:
+        return False
+    return True
+
+
+def _frame_wants_object(frame: PropositionFrame) -> bool:
+    object_names = {"object", "ground", "locus", "location", "genitive", "created"}
+    return any(slot.required and slot.name in object_names for slot in frame.slots)
+
+
+def _render_surface(
+    frame: PropositionFrame,
+    subject: str,
+    predicate: str,
+    object_surface: str | None,
+) -> str:
+    if frame.language == "he" and frame.predicate_type == "copular":
+        return f"{subject} {predicate}"
+    if object_surface is not None:
+        return f"{subject} {predicate} {object_surface}"
+    if frame.predicate_type.startswith("copular"):
+        return f"{subject} {predicate}"
+    return f"{subject} {predicate}"
diff --git a/pyproject.toml b/pyproject.toml
index 0b22f0db..cb1beec6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,7 @@ dependencies = [
     "mlx>=0.18; sys_platform == 'darwin'",
     "pytest>=9.0.3",
     "pytest-asyncio>=1.3.0",
+    "ruff>=0.15.12",
 ]
 
 [project.optional-dependencies]
diff --git a/tests/test_proposition.py b/tests/test_proposition.py
new file mode 100644
index 00000000..5dc4282f
--- /dev/null
+++ b/tests/test_proposition.py
@@ -0,0 +1,38 @@
+from __future__ import annotations
+
+from algebra.cga import cga_inner
+from generate.proposition import FrameRegistry, Proposition, propose
+from ingest.gate import inject
+from language_packs.compiler import load_mounted_packs
+from vault.store import VaultStore
+
+
+def test_light_prompt_generates_structured_proposition_near_prompt():
+    vocab = load_mounted_packs(
+        ("en_minimal_v1", "he_logos_micro_v1", "grc_logos_micro_v1")
+    )
+    state = inject(["light", "אוֹר", "φῶς"], vocab)
+    vault = VaultStore()
+    random_idx = vault.store(vocab.get_versor("λόγος"), {"kind": "random"})
+    registry = FrameRegistry.from_pack("grc", vocab)
+
+    proposition = propose(state, vault, vocab, registry)
+
+    assert isinstance(proposition, Proposition)
+    assert proposition.subject
+    assert proposition.predicate
+    assert proposition.surface
+    random_entry = vault.recall(vocab.get_versor("λόγος"), top_k=1)[0]["versor"]
+    prompt = state.F
+
+    assert cga_inner(proposition.subject_versor, prompt) > cga_inner(
+        proposition.subject_versor,
+        random_entry,
+    )
+    assert cga_inner(proposition.predicate_versor, prompt) > cga_inner(
+        proposition.predicate_versor,
+        random_entry,
+    )
+    stored = vault.recall(state.F, top_k=2)
+    assert any(hit["metadata"].get("kind") == "proposition" for hit in stored)
+    assert random_idx == 0