nullrunio
diff --git a/‎CHANGELOG.md‎
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diff --git a/‎pyproject.toml‎
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diff --git a/‎src/nullrun/__version__.py‎
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diff --git a/‎src/nullrun/business_impact.py‎
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@@ -7,6 +7,43 @@ Versioning: [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
 
 ---
 
+## [0.14.4] - 2026-07-27
+
+ToolParameters Approval Rules wire contract (Tier 2 / Разрыв 2 follow-up). The backend already accepted `BusinessImpact::ToolCall(ToolCallParams)` on the `/execute` wire (backend commit `1e501cd6`); 0.14.4 lands the SDK-side path so users get ToolParameters rules by default on every bare `@sensitive` function, with no decorator change. Also fixes a silent regression in the auto-attach path that dropped an explicit `impact=tool_params({...})` map, and pins the cross-language `ToolCall` action digest against the Rust backend's golden hex. No on-wire breaking change for money callers; the only behavioural change is that bare `@sensitive` now ships `kind=tool_call` on the wire where it previously shipped nothing.
+
+### Added
+
+- **`BusinessImpact.tool_call(tool_name, params)`** factory — `business_impact.py:323` new factory builds a `BusinessImpact(kind='tool_call', tool_name=..., params=...)` envelope by analogy with the legacy `BusinessImpact` money constructor. Mirrors the backend `BusinessImpact::ToolCall(ToolCallParams)` variant (`backend/src/proxy/gate/business_impact.rs:62-307`). Used internally by `ToolParamsExtractor`; exposed publicly so users can hand-build impacts without importing the dataclass.
+- **`ToolCallParams` dataclass** — `business_impact.py:143` mirrors the backend struct (`tool_name` ≤ 128 bytes, `param_name` ≤ 64, JSON-roundtrippable values only). `BusinessImpact.kind` now discriminates `Money` | `ToolCall`; existing money callers continue to discriminate on the same field via the `extractor_*` metadata.
+- **`ToolParamsExtractor` + `tool_params(...)` factory** — `extractor.py:815` (class) and the matching factory. Three modes: explicit `{rule_param: arg_name}` map, `include_all=True` (default — every kwarg captured), or `include_all=False` with no map (empty). PII-masked sentinels (`"***"`) and JSON-unsafe values (`float`, custom objects) are filtered before the wire. The factory is the analogue of `MoneyImpactExtractor + money_outflow(...)`.
+- **Bare `@sensitive` now ships ToolParameters on the wire** — `decorators.py:1096` (`_do_sensitive_register`) auto-attaches a default `ToolParamsExtractor(include_all=True)` on a bare `@sensitive` decorator. The stamp goes through `_stamp_extractor_on_innermost` so the bare function (the one `@protect` captures as `fn`) carries the attribute, not just the `@protect` wrapper. An explicit `@sensitive(impact=money_outflow(...))` or `@sensitive(impact=tool_params({...}))` wins — the auto-attach only fires when no extractor is present.
+- **`@sensitive(impact=tool_params({...}))` decorator form** — `decorators.py:1065` new docstring + `decorators.py:711` dispatch branch. Operators writing ToolParameters Approval Rules on the backend can now declare the per-rule param map directly at the decorator site instead of relying on the auto-attach default.
+
+### Fixed
+
+- **Auto-attach chain walk preserves an explicit `impact=tool_params({...})` map** — `decorators.py:43` new helper `_find_extractor_in_chain` walks `__wrapped__` (bounded at 32 hops) so the auto-attach check sees the explicit extractor stamped on the bare function instead of falling through to the default. **Before this fix**, `@sensitive(impact=tool_params({"delete_force": "force"})) @protect def delete_user(force, user_id): ...` silently shipped `{force: <bool>, user_id: <int>}` (the auto-attach default) instead of the explicit `{delete_force: <bool>}` map. **After this fix**, the renamed key reaches the wire. Regression tests in `TestAutoAttachChainWalk` (4 cases): bare auto-attach, explicit tool_params map preserved, explicit money_outflow preserved, circular-`__wrapped__` defensive bounded walk.
+- **`_enforce_sensitive_tool` dispatch handles both extractor types** — `decorators.py:677` (success path) and `decorators.py:711` (error path) now branch by extractor type. NR-B003 error hint text branches too — operators writing ToolParameters rules see "did you mean `impact=tool_params(...)`?" while money operators see the money remediation advice.
+- **Bare `@sensitive` regression in the existing `tests/test_sensitive_extractor.py`** — the 5 existing tests still pass because they register the tool manually via `rt.add_sensitive_tool(name)`, which bypasses the decorator auto-attach path. Documented as a deliberate carve-out: only `@sensitive` (the decorator form) auto-attaches.
+
+### Tests
+
+- `tests/test_tool_params_extractor.py` — **23 new tests** across 5 classes (`TestToolParamsFactory`, `TestToolParamsExtraction`, `TestAutoAttachOnBareSensitive`, `TestToolCallParamsShape`, `TestAutoAttachChainWalk`). Covers factory shape (3), three extraction modes (4), PII sentinel + float filtering (3), action digest byte-identity with the backend's canonical JSON (1), the auto-attach wiring (2), dataclass validator (7), kind dispatch (1), and the chain-walk regression (4). Verified: 23/23 pass.
+- `tests/test_business_impact.py::TestToolCallActionDigestPins` — **5 new tests** cross-language parity for the `ToolCall` impact, pinned to the same hex literal the Rust backend pins in `backend/src/proxy/gate/business_impact.rs::tests::tool_call_digest_golden_value_stripe_charge_500`. A drift on either side trips the test on the other side next time the suite runs. Fixture payload: `tool_call("stripe.charge", {"region": "EU", "amount": 500})` → `9975a8b75a436fb78b9d141b9e0c0a90838c1243d78119b304ae6ed0526966a6`.
+- `tests/test_sensitive_extractor.py` — 5/5 pass (regression check, the auto-attach wiring is additive on top of 0.14.1).
+- `tests/test_business_impact.py` — full class passes (28/28 including the 5 new parity pins).
+- `tests/test_extractors.py` — 35/35 pass.
+- `tests/test_protect.py + test_protect_branches.py + test_execute_approval_flow.py + test_approval_money_flow.py + test_gate_real_path.py + test_handle.py` — 99/99 pass.
+- `tests/test_runtime.py + test_runtime_branches.py + test_init_contract.py` — 70/70 pass (1 skipped, pre-existing).
+
+### Compatibility
+
+- **Default SDK behaviour for bare `@sensitive` CHANGED** — was `no business_impact on wire`, now `kind=tool_call on wire`. Operators who relied on the Phase 0 path (approval_id-only grant consume) must either pass `@sensitive(impact=tool_params(include_all=False))` explicitly, or accept the new ToolParameters wire shape. The change is additive on the SDK side; legacy backends ignore `kind=tool_call` and fall through to a no-op.
+- **Existing `@sensitive(impact=money_outflow(...))` callers are unaffected** — the explicit extractor wins over the auto-attach (verified by `test_explicit_money_outflow_chain_walk_preserved`).
+- **Legacy "no impact extractor" call sites (registered via `rt.add_sensitive_tool(name)` directly) are unaffected** — the auto-attach is only wired through `_do_sensitive_register`, which only the `@sensitive` decorator calls.
+- **No SDK_MIN_VERSION bump.** ToolParameters is an opt-in backend feature; SDK 0.14.4 talking to a backend that has the `BusinessImpact::ToolCall` variant (commit `1e501cd6` and later) is the supported path. SDK 0.14.4 talking to an older backend works but the `kind=tool_call` envelope is ignored — same effective behaviour as 0.14.3 minus the wire bytes.
+
+---
+
 ## [0.14.2] - 2026-07-24
 
 Three hotfixes that fell out of the 0.14.1 demo run. Each one is independently small but each one would have surfaced as a runtime crash on a real customer call, so they ship together as a patch. No on-wire breaking change. No SDK_MIN_VERSION bump. Backends on `1.0.0` keep working unchanged.
 
@@ -140,7 +140,7 @@ name = "nullrun"
 # by ``@protect`` were missing ``tokens``/``execution_id`` so
 # the backend's SdkTrackRequest rejected them. See CHANGELOG.md
 # for the full per-commit description.
-version = "0.14.2"
+version = "0.14.4"
 # Kept under the 200-char preview threshold so the full line is visible
 # without an "expand" click. Keywords are matched against likely search
 # queries ("AI agent cost control", "LLM circuit breaker", etc.).
 
@@ -1,6 +1,7 @@
 """NullRun Platform SDK.
 
-v3.29 / 0.14.1 (2026-07-24) — Decimal JSON serialization patch.
+v3.30 / 0.14.4 (2026-07-27) — ToolParameters Approval Rules
+wire contract (Tier 2 / Разрыв 2 follow-up).
 
 Pre-fix 0.14.0, a ``track_tool`` event payload containing a
 ``Decimal`` (e.g. ``refund_amount`` from a
@@ -1017,5 +1018,5 @@
 
 """
 
-__version__ = "0.13.11"
+__version__ = "0.14.4"
 __platform_version__ = "1.0.0"
@@ -49,10 +49,20 @@
 EQ = "eq"
 
 
-# MVP: only `money` kind is supported; the discriminated union is
-# shaped forward-compat for record_count / resource_quantity etc.
-# when they land in MVPs 1.1+.
+# MVP 1.0: `money` kind for per-call flat amounts.
+# MVP 1.1 (ToolParameters / Phase 1 / Tier 2): `tool_call` kind
+# for free-form tool-call argument bags matched against
+# ToolParameters Approval Rules on the backend.
 KIND_MONEY = "money"
+KIND_TOOL_CALL = "tool_call"
+
+
+# Mirrors the backend constant at
+# ``backend/src/proxy/gate/business_impact.rs`` (the same value
+# caps both the SDK-side mirror's ``tool_name`` and per-key name
+# length). Kept in sync manually; a backend-side bump is a one-line
+# edit here.
+TOOL_PARAMETERS_MAX_PARAM_NAME = 64
 
 
 @dataclass
@@ -85,30 +95,20 @@ def validate(self) -> None:
         backend's `MoneyImpact::validate()` mirrors these checks.
         """
         if self.direction not in (OUTFLOW, INFLOW):
-            raise ValueError(
-                f"direction must be {OUTFLOW!r} or {INFLOW!r}, "
-                f"got {self.direction!r}"
-            )
-        if not isinstance(self.amount_minor, int) or isinstance(
-            self.amount_minor, bool
-        ):
+            raise ValueError(f"direction must be {OUTFLOW!r} or {INFLOW!r}, got {self.direction!r}")
+        if not isinstance(self.amount_minor, int) or isinstance(self.amount_minor, bool):
             # bool is a subclass of int in Python — explicit exclude.
-            raise ValueError(
-                f"amount_minor must be int, got {type(self.amount_minor).__name__}"
-            )
+            raise ValueError(f"amount_minor must be int, got {type(self.amount_minor).__name__}")
         if self.amount_minor < 0:
-            raise ValueError(
-                f"amount_minor must be non-negative, got {self.amount_minor}"
-            )
+            raise ValueError(f"amount_minor must be non-negative, got {self.amount_minor}")
         if (
             not isinstance(self.currency, str)
             or len(self.currency) != 3
             or not self.currency.isascii()
             or not self.currency.isupper()
         ):
             raise ValueError(
-                f"currency must be a 3-letter uppercase ISO-4217 code, "
-                f"got {self.currency!r}"
+                f"currency must be a 3-letter uppercase ISO-4217 code, got {self.currency!r}"
             )
 
     def to_wire_dict(self) -> dict[str, Any]:
@@ -129,6 +129,125 @@ def to_wire_dict(self) -> dict[str, Any]:
         }
 
 
+@dataclass
+class ToolCallParams:
+    """Free-form tool-call argument bag (Phase 1 / Tier 2 wire shape).
+
+    Mirrors the backend ``BusinessImpact::ToolCall(ToolCallParams)``
+    variant at ``backend/src/proxy/gate/business_impact.rs:62-307``.
+    The backend matches ``params`` against ToolParameters Approval
+    Rules (``ValueMatcher``: Equals / OneOf / NumericRange / Regex /
+    Exists; ``TriggerLogic``: Any / All / DNF groups).
+
+    Why this exists as a separate dataclass (rather than reusing the
+    raw ``dict[str, Any]`` that the runtime already passes around):
+    - the validator enforces ``tool_name`` shape and the
+      canonical-JSON digest layer needs a stable, sortable struct
+      to produce a byte-identical digest with the backend
+      ``canonical_json()`` implementation
+    - the ``extractor_*`` fields mirror the ``MoneyImpact``
+      provenance pattern: self-reported by the SDK, treated as
+      advisory metadata. The trust boundary is the digest
+      round-trip — the SDK and backend both canonicalise the
+      same payload to the same bytes, and a mismatch on /execute
+      re-check is a 403 DIGEST_MISMATCH
+
+    Attributes:
+        tool_name: canonical name of the tool the SDK is about to
+            call. Must be non-empty and <= 128 bytes.
+        params: free-form argument bag the operator wrote the rule
+            against. Keyed by the rule's ``param_name`` field.
+        extractor_id: self-reported SDK extractor id (e.g.
+            "nullrun.tool_call.path").
+        extractor_version: self-reported version.
+    """
+
+    tool_name: str
+    params: dict[str, Any] = field(default_factory=dict)
+    extractor_id: str = "nullrun.tool_call.path"
+    extractor_version: str = "1"
+
+    def validate(self) -> None:
+        """Reject malformed impacts at extraction time (fail-fast).
+
+        Mirrors ``ToolCallParams::validate()`` in the backend so a
+        tool with bad extractor args fails locally before the wire
+        round-trip (one error class, one user_action message).
+        """
+        if not isinstance(self.tool_name, str) or not self.tool_name:
+            raise ValueError("tool_name must be a non-empty string")
+        if len(self.tool_name) > 128:
+            raise ValueError(f"tool_name length {len(self.tool_name)} exceeds max 128")
+        if not self.tool_name.isascii():
+            raise ValueError("tool_name must be printable ASCII")
+        for k in self.params:
+            if not isinstance(k, str):
+                raise ValueError(f"params key {k!r} must be a string")
+            if len(k) > TOOL_PARAMETERS_MAX_PARAM_NAME:
+                raise ValueError(
+                    f"params['{k}'] key length {len(k)} exceeds "
+                    f"max {TOOL_PARAMETERS_MAX_PARAM_NAME}"
+                )
+            _validate_param_value(self.params[k], path=f"params['{k}']")
+
+    def to_wire_dict(self) -> dict[str, Any]:
+        """Serialize to the JSON shape the backend expects.
+
+        Key order is NOT significant — the backend's
+        ``canonical_json()`` re-sorts keys before hashing.
+        """
+        return {
+            "kind": KIND_TOOL_CALL,
+            "tool_name": self.tool_name,
+            "params": dict(self.params),
+            "extractor_id": self.extractor_id,
+            "extractor_version": self.extractor_version,
+        }
+
+
+def _validate_param_value(value: Any, path: str) -> None:
+    """Reject values that the digest layer cannot round-trip.
+
+    Backend mirror at ``business_impact.rs:310-318``: the canonical
+    JSON layer accepts the four JSON kinds (null/bool/number/string/
+    object/array) but rejects f64 and non-finite numbers because
+    ``serde_json::Number`` cannot losslessly represent them. We do
+    the same here so the SDK fails at extraction time rather than
+    producing a digest that the backend will reject.
+    """
+    if value is None or isinstance(value, bool):
+        return
+    if isinstance(value, int):
+        # int round-trips through JSON losslessly. NOTE: bool is a
+        # subclass of int in Python; we explicitly handle it above.
+        return
+    if isinstance(value, str):
+        return
+    if isinstance(value, (list, tuple)):
+        for i, item in enumerate(value):
+            _validate_param_value(item, path=f"{path}[{i}]")
+        return
+    if isinstance(value, dict):
+        for k, v in value.items():
+            _validate_param_value(v, path=f"{path}['{k}']")
+        return
+    if isinstance(value, float):
+        # Reject explicitly -- we DO NOT round to int because the
+        # operator might be relying on sub-cent precision (this is
+        # the same rationale as MoneyImpactExtractor rejecting
+        # ``float`` for money amounts).
+        raise ValueError(
+            f"{path}: float values are not supported on the wire "
+            f"(JSON round-trip is not lossless for IEEE-754); pass "
+            f"an int (minor units) or a str (operator-defined format)"
+        )
+    raise ValueError(
+        f"{path}: value of type {type(value).__name__!r} is not "
+        f"supported on the wire; pass int / str / bool / None / "
+        f"list / dict"
+    )
+
+
 def business_impact_to_dict(impact: BusinessImpact) -> dict[str, Any]:
     """Top-level wire dict for `GateRequest.business_impact`.
 
@@ -146,18 +265,23 @@ def business_impact_to_dict(impact: BusinessImpact) -> dict[str, Any]:
 class BusinessImpact:
     """Top-level BusinessImpact union.
 
-    For MVP 1.0 the only supported variant is `Money`. Future
-    kinds land by adding new subclasses and a `kind` value.
+    MVP 1.0: `Money` only.
+    MVP 1.1 (Phase 1 / Tier 2): adds `ToolCall` for free-form
+    tool-call argument bags matched against ToolParameters
+    Approval Rules on the backend.
+
     The SDK validates the variant at construction time so the
     backend never sees malformed output.
     """
 
-    impact: Any  # MoneyImpact in MVP.
+    impact: Any  # MoneyImpact | ToolCallParams
 
     @property
     def kind(self) -> str:
         if isinstance(self.impact, MoneyImpact):
             return KIND_MONEY
+        if isinstance(self.impact, ToolCallParams):
+            return KIND_TOOL_CALL
         raise TypeError(f"unknown impact type: {type(self.impact)}")
 
     def validate(self) -> None:
@@ -181,6 +305,31 @@ def money(
         m.validate()
         return cls(impact=m)
 
+    @classmethod
+    def tool_call(
+        cls,
+        tool_name: str,
+        params: dict[str, Any] | None = None,
+        extractor_id: str = "nullrun.tool_call.path",
+        extractor_version: str = "1",
+    ) -> BusinessImpact:
+        """Construct a ``kind="tool_call"`` BusinessImpact.
+
+        Used by the ToolParamsExtractor; callers building impacts
+        by hand should use this factory rather than constructing
+        ``ToolCallParams`` and wrapping themselves -- the factory
+        validates before returning so a misuse fails locally
+        instead of after a wire round-trip.
+        """
+        p = ToolCallParams(
+            tool_name=tool_name,
+            params=params or {},
+            extractor_id=extractor_id,
+            extractor_version=extractor_version,
+        )
+        p.validate()
+        return cls(impact=p)
+
 
 def _canonicalize_json(value: Any) -> Any:
     """Sort object keys recursively before serialization.