Redesign audit_wiring output for large ICs

Group results by net name instead of per-pin, keeping the summary
compact enough to stay inline even for 100+ pin components. Add
anomaly detection (unconnected pins, high-fanout nets, auto-named
nets) and optional pin/net filters. Wire coordinates are now opt-in
via include_wires flag to avoid flooding the calling LLM with
coordinate noise.

src/mckicad/tools/schematic_analysis.py

@@ -1139,22 +1139,34 @@ def export_schematic_pdf(
 
 
 @mcp.tool()
-def audit_wiring(schematic_path: str, reference: str) -> dict[str, Any]:
-    """Trace all wires connected to a component and report per-pin net membership.
+def audit_wiring(
+    schematic_path: str,
+    reference: str,
+    pins: list[str] | None = None,
+    net: str | None = None,
+    include_wires: bool = False,
+) -> dict[str, Any]:
+    """Audit wiring for a component, grouped by net name with anomaly detection.
 
-    For each pin on the specified component, reports the net it belongs to,
-    the wire segments in that net, and other pins sharing the same net.
-    Essential for debugging wiring errors — especially overlapping wire
-    segments that create unintended shorts.
+    Returns a compact net-grouped summary that fits inline even for 100+ pin
+    ICs.  Each net entry lists which pins of the component belong to it, how
+    many wire segments exist, and what other components are connected.
+
+    By default, wire segment coordinates are omitted to keep the response
+    compact.  Pass ``include_wires=True`` to get full ``{start, end, uuid}``
+    data for each wire (offloaded to a sidecar file when large).
 
     Args:
         schematic_path: Path to a .kicad_sch file.
         reference: Component reference designator (e.g. ``U8``, ``R1``).
+        pins: Optional list of pin numbers to filter to (e.g. ``["103", "97"]``).
+        net: Optional net name to filter to (only pins on this net are included).
+        include_wires: Include wire segment coordinates and UUIDs. Default False.
 
     Returns:
-        Dictionary with ``reference``, ``pin_nets`` list (per-pin net info
-        with wire segments and connected pins), and ``detail_file`` when
-        the result exceeds the inline threshold.
+        Dictionary with ``net_summary`` (grouped by net), ``anomalies``
+        (unconnected pins, high-fanout nets, auto-named nets), and optionally
+        ``detail_file`` when wire data is offloaded.
     """
     err = _require_sch_api()
     if err:
@@ -1182,14 +1194,13 @@ def audit_wiring(schematic_path: str, reference: str) -> dict[str, Any]:
         root_to_net: dict[tuple[float, float], str] = {}
         for n_name, n_pins in net_graph.items():
             for p in n_pins:
-                # Find coordinate for this pin
                 for coord, pin_list in pin_at.items():
                     for pe in pin_list:
                         if pe["reference"] == p["reference"] and pe["pin"] == p["pin"]:
                             root = find_fn(coord)
                             root_to_net[root] = n_name
 
-        # Build wire segments by net root (each wire's endpoints share a root)
+        # Build wire segments by net root
         root_to_wires: dict[tuple[float, float], list[dict[str, Any]]] = {}
         for ws in wire_segments:
             s_coord = (round(ws["start"]["x"], 2), round(ws["start"]["y"], 2))
@@ -1210,50 +1221,115 @@ def audit_wiring(schematic_path: str, reference: str) -> dict[str, Any]:
                 "schematic_path": schematic_path,
             }
 
-        # Build per-pin audit report
-        pin_nets: list[dict[str, Any]] = []
+        # Apply pin filter early
+        if pins is not None:
+            pin_set = set(pins)
+            target_pins = [(p, c) for p, c in target_pins if p in pin_set]
+
+        # Group target pins by net name
+        net_groups: dict[str, list[tuple[str, tuple[float, float]]]] = {}
         for pin_num, coord in target_pins:
             root = find_fn(coord)
             net_name = root_to_net.get(root, "unconnected")
+            net_groups.setdefault(net_name, []).append((pin_num, coord))
+
+        # Apply net filter
+        if net is not None:
+            net_groups = {k: v for k, v in net_groups.items() if k == net}
+
+        # Build net_summary
+        net_summary: dict[str, dict[str, Any]] = {}
+        for net_name, group_pins in sorted(net_groups.items()):
+            pin_nums = sorted([p for p, _ in group_pins])
+
+            # Collect wires for this net (use root of any pin in the group)
+            _, first_coord = group_pins[0]
+            root = find_fn(first_coord)
             wires = root_to_wires.get(root, [])
 
-            # Collect other pins on the same net
-            connected_pins: list[dict[str, str]] = []
+            # Collect other components connected to this net
+            connected_to: list[dict[str, str]] = []
             if net_name in net_graph:
                 for p in net_graph[net_name]:
-                    if not (p["reference"] == reference and p["pin"] == pin_num):
-                        connected_pins.append(p)
+                    if p["reference"] != reference:
+                        connected_to.append(p)
 
-            pin_nets.append({
-                "pin": pin_num,
-                "net": net_name,
+            entry: dict[str, Any] = {
+                "pins": pin_nums,
                 "wire_count": len(wires),
-                "wires": wires,
-                "connected_pins": connected_pins,
-            })
+                "connected_to": connected_to,
+            }
 
+            if include_wires:
+                entry["wires"] = wires
+
+            net_summary[net_name] = entry
+
+        # Compute anomalies
+        unconnected_pins = sorted(
+            [p for p, _ in group_pins]
+            for net_name, group_pins in net_groups.items()
+            if net_name == "unconnected"
+        )
+        # Flatten list of lists into a single list
+        unconnected_flat: list[str] = []
+        for pl in unconnected_pins:
+            unconnected_flat.extend(pl)
+
+        high_fanout_nets: list[dict[str, Any]] = []
+        for net_name, entry in net_summary.items():
+            if net_name == "unconnected":
+                continue
+            pin_count = len(entry["pins"])
+            total_connections = len(entry["connected_to"])
+            if pin_count > 2 or total_connections > 4:
+                high_fanout_nets.append({
+                    "net": net_name,
+                    "pin_count": pin_count,
+                    "total_connections": total_connections,
+                })
+
+        auto_named_nets: list[dict[str, Any]] = [
+            {"net": net_name, "pins": entry["pins"]}
+            for net_name, entry in net_summary.items()
+            if net_name.startswith("Net-(")
+        ]
+
+        anomalies: dict[str, Any] = {
+            "unconnected_pins": unconnected_flat,
+            "high_fanout_nets": high_fanout_nets,
+            "auto_named_nets": auto_named_nets,
+        }
+
+        total_pin_count = sum(len(e["pins"]) for e in net_summary.values())
         logger.info(
-            "audit_wiring for %s: %d pins, %d total wire segments",
-            reference, len(pin_nets),
-            sum(pn["wire_count"] for pn in pin_nets),
+            "audit_wiring for %s: %d pins across %d nets",
+            reference, total_pin_count, len(net_summary),
         )
 
         result: dict[str, Any] = {
             "success": True,
             "reference": reference,
-            "pin_count": len(pin_nets),
+            "pin_count": total_pin_count,
+            "net_count": len(net_summary),
+            "net_summary": net_summary,
+            "anomalies": anomalies,
             "engine": _get_schematic_engine(),
             "schematic_path": schematic_path,
         }
 
-        if len(pin_nets) > INLINE_RESULT_THRESHOLD:
+        # Offload wire detail to sidecar only when wires are included and large
+        if include_wires and len(net_summary) > INLINE_RESULT_THRESHOLD:
+            wire_detail = {
+                n: {"wires": e.get("wires", [])} for n, e in net_summary.items()
+            }
             detail_path = write_detail_file(
-                schematic_path, f"audit_{reference}.json", pin_nets,
+                schematic_path, f"audit_{reference}_wires.json", wire_detail,
             )
             result["detail_file"] = detail_path
-            result["pin_nets_preview"] = pin_nets[:INLINE_RESULT_THRESHOLD]
-        else:
-            result["pin_nets"] = pin_nets
+            # Strip wires from inline summary to keep it compact
+            for entry in net_summary.values():
+                entry.pop("wires", None)
 
         return result
 

tests/test_schematic_analysis.py

@@ -154,8 +154,9 @@ class TestAuditWiring:
         )
         assert result["success"] is True
         assert result["reference"] == "R1"
-        assert "pin_nets" in result or "pin_nets_preview" in result
+        assert "net_summary" in result
         assert result.get("pin_count", 0) > 0
+        assert "net_count" in result
 
     def test_audit_nonexistent_component(self, populated_schematic):
         from mckicad.tools.schematic_analysis import audit_wiring
@@ -184,7 +185,8 @@ class TestAuditWiring:
         )
         assert result["success"] is False
 
-    def test_audit_pin_net_structure(self, populated_schematic):
+    def test_audit_net_summary_structure(self, populated_schematic):
+        """Each net entry has pins, wire_count, connected_to — no wires by default."""
         from mckicad.tools.schematic_analysis import audit_wiring
 
         result = audit_wiring(
@@ -192,13 +194,79 @@ class TestAuditWiring:
             reference="R1",
         )
         if result["success"]:
-            pin_nets = result.get("pin_nets", result.get("pin_nets_preview", []))
-            for pn in pin_nets:
-                assert "pin" in pn
-                assert "net" in pn
-                assert "wire_count" in pn
-                assert "wires" in pn
-                assert "connected_pins" in pn
+            for _net_name, entry in result["net_summary"].items():
+                assert "pins" in entry
+                assert isinstance(entry["pins"], list)
+                assert "wire_count" in entry
+                assert "connected_to" in entry
+                assert isinstance(entry["connected_to"], list)
+                # No wire coords by default
+                assert "wires" not in entry
+
+    def test_audit_include_wires(self, populated_schematic):
+        """When include_wires=True, each net entry contains a wires list."""
+        from mckicad.tools.schematic_analysis import audit_wiring
+
+        result = audit_wiring(
+            schematic_path=populated_schematic,
+            reference="R1",
+            include_wires=True,
+        )
+        if result["success"]:
+            for _net_name, entry in result["net_summary"].items():
+                assert "wires" in entry
+                assert isinstance(entry["wires"], list)
+
+    def test_audit_pin_filter(self, populated_schematic):
+        """Filtering by pin number limits the net_summary to matching nets."""
+        from mckicad.tools.schematic_analysis import audit_wiring
+
+        result = audit_wiring(
+            schematic_path=populated_schematic,
+            reference="R1",
+            pins=["1"],
+        )
+        if result["success"]:
+            # Only nets containing pin "1" should appear
+            for entry in result["net_summary"].values():
+                assert "1" in entry["pins"]
+
+    def test_audit_net_filter(self, populated_schematic):
+        """Filtering by net name limits the summary to that net only."""
+        from mckicad.tools.schematic_analysis import audit_wiring
+
+        # First get all nets to pick one
+        full = audit_wiring(
+            schematic_path=populated_schematic,
+            reference="R1",
+        )
+        if full["success"] and full["net_summary"]:
+            target_net = next(iter(full["net_summary"]))
+            filtered = audit_wiring(
+                schematic_path=populated_schematic,
+                reference="R1",
+                net=target_net,
+            )
+            assert filtered["success"] is True
+            assert list(filtered["net_summary"].keys()) == [target_net]
+
+    def test_audit_anomalies_structure(self, populated_schematic):
+        """Anomalies dict always present with expected keys."""
+        from mckicad.tools.schematic_analysis import audit_wiring
+
+        result = audit_wiring(
+            schematic_path=populated_schematic,
+            reference="R1",
+        )
+        if result["success"]:
+            assert "anomalies" in result
+            anomalies = result["anomalies"]
+            assert "unconnected_pins" in anomalies
+            assert isinstance(anomalies["unconnected_pins"], list)
+            assert "high_fanout_nets" in anomalies
+            assert isinstance(anomalies["high_fanout_nets"], list)
+            assert "auto_named_nets" in anomalies
+            assert isinstance(anomalies["auto_named_nets"], list)
 
 
 @requires_sch_api