diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a2afba..2e0571e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,8 @@ format changes.
 
 ### Added
 
+- **The lite tier reads and writes fields of `google.protobuf.Any`, `Empty`, `FieldMask`, `Struct`, `Value`, `ListValue` and `NullValue`** (trendvidia/protowire#539). A lite schema with such a field did not compile, because its generated meta named `com.google.protobuf.AnyPxfMeta`, which nothing generates. `:pxf-runtime` now ships these companions in `org.protowire.pxf.wkt`, as `protoc-gen-pxf-java-meta`'s output for the four google files, and the plugin from trendvidia/protowire#550 on points there. They are written as ordinary blocks, the same text protowire-go writes. An Any is written as `type_url` and `value`, since the lite tier has no type resolver. `pxf-runtime/scripts/regen-wkt-companions.sh` regenerates the companions.
+
 - **Producers refuse a message nested past `MaxNestingDepth`** (#167; HARDENING.md § Recursion, protowire#502). `Pxf.marshal` counts each `{` and `[` it writes, as a decoder of the text counts them. `Pb.marshal` counts each submessage and map entry. Past the limit, `Pxf.marshal` throws `PxfException` and `Pb.marshal` throws `IOException`, both with the message `nesting depth exceeds MaxNestingDepth=100`. Before, they wrote a document that a reader at the same limit refuses, and a reference cycle in a `Pb` struct overflowed the stack. The limit is per call: `MarshalOptions.withMaxNestingDepth` in `pxf`, and the new `org.protowire.pb.MarshalOptions` with `Pb.marshal(Object, MarshalOptions)`. An Any whose body would go past the limit is still written, as `type_url` and `value`. `check-decode --format pb-render` now reads its input with the stock reader's limit raised, so the corpus's 101-level rows reach the producer.
 - **`Convert.xmlToProto` reads a `char` type's `characterEncoding`** (#173; draft `-01` § Character Encoding, protowire#494). A `char` becomes a `string` only when the encoding is absent (the FIX SBE default, US-ASCII) or names US-ASCII or UTF-8, by IANA name or alias, ignoring case and punctuation. Any other encoding becomes `bytes` of the same `(sbe.length)`, with a comment that says why. Before, every `char` was a `string`, so a schema declaring `ISO-8859-1` imported cleanly, and the first byte outside UTF-8 then failed the whole message. This follows protowire-go#248.
 - **A generated lite `<Message>SbeCodec` takes per-call limits** (#148): `unmarshal(data, maxMessageSize, maxRepeatedCount)` and the same with a builder. This needs `protoc-gen-pxf-java-meta` from trendvidia/protowire#541 on. `check-decode-android` now decodes SBE through the generated codec, so the security gate tests the entry point a caller uses, not only `SbeWireCodec` underneath it.
diff --git a/gradle.properties b/gradle.properties
index aabc72e..64b9a5c 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -12,4 +12,4 @@ org.gradle.jvmargs=-Xmx2g -Dfile.encoding=UTF-8
 # A release tag of trendvidia/protowire, or a full commit SHA while a plugin
 # change waits for its tag; bump when the plugin changes
 # (cmd/protoc-gen-pxf-java-meta).
-pxfJavaMeta.ref=474e8ece24eb48f4f840db7d68fd87eb67a90a89
+pxfJavaMeta.ref=9e5474019dca0b5573e61f3ac35d88334b38eb91
diff --git a/pxf-android-codegen-it/src/main/proto/wkt/test/v1/google_messages.proto b/pxf-android-codegen-it/src/main/proto/wkt/test/v1/google_messages.proto
new file mode 100644
index 0000000..328e07a
--- /dev/null
+++ b/pxf-android-codegen-it/src/main/proto/wkt/test/v1/google_messages.proto
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2026 TrendVidia, LLC.
+syntax = "proto3";
+package wkt.test.v1;
+
+option java_package = "wkt.test.v1";
+option java_multiple_files = true;
+
+import "google/protobuf/any.proto";
+import "google/protobuf/empty.proto";
+import "google/protobuf/field_mask.proto";
+import "google/protobuf/struct.proto";
+
+// The google/protobuf types PXF reads as ordinary messages. Their companions
+// ship in org.protowire.pxf.wkt; before trendvidia/protowire#539 the generated
+// meta named com.google.protobuf.AnyPxfMeta, which does not exist, and this
+// file did not compile.
+message GoogleMessages {
+  google.protobuf.Any any = 1;
+  repeated google.protobuf.Any anys = 2;
+  map<string, google.protobuf.Any> any_map = 3;
+  google.protobuf.Empty empty = 4;
+  google.protobuf.FieldMask mask = 5;
+  google.protobuf.Struct struct = 6;
+  google.protobuf.Value value = 7;
+  google.protobuf.ListValue list = 8;
+  google.protobuf.NullValue null_value = 9;
+}
diff --git a/pxf-android-codegen-it/src/test/java/org/protowire/lite/it/GoogleMessagesLiteTest.java b/pxf-android-codegen-it/src/test/java/org/protowire/lite/it/GoogleMessagesLiteTest.java
new file mode 100644
index 0000000..36688cf
--- /dev/null
+++ b/pxf-android-codegen-it/src/test/java/org/protowire/lite/it/GoogleMessagesLiteTest.java
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2026 TrendVidia, LLC.
+package org.protowire.lite.it;
+
+import com.google.protobuf.Any;
+import com.google.protobuf.ByteString;
+import com.google.protobuf.Empty;
+import com.google.protobuf.FieldMask;
+import com.google.protobuf.ListValue;
+import com.google.protobuf.NullValue;
+import com.google.protobuf.Struct;
+import com.google.protobuf.Value;
+import org.junit.jupiter.api.Test;
+import wkt.test.v1.GoogleMessages;
+import wkt.test.v1.GoogleMessagesPxfCodec;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * A lite schema with a field of each google/protobuf type that PXF reads as an
+ * ordinary message compiles, and each round-trips through the generated codec
+ * with no registry (trendvidia/protowire#539). The lite tier has no type
+ * resolver, so an Any is written as {@code type_url} and {@code value}, which
+ * protowire#501 allows: the bytes read back are the stored bytes.
+ */
+final class GoogleMessagesLiteTest {
+
+    private static GoogleMessages roundTrip(GoogleMessages in) {
+        String text = GoogleMessagesPxfCodec.marshal(in);
+        GoogleMessages back = GoogleMessagesPxfCodec.unmarshal(text);
+        assertEquals(in, back, text);
+        return back;
+    }
+
+    /**
+     * Bytes no body could reproduce: an unknown field 99, then field 1 twice.
+     * Read back as anything but these bytes, the Any has changed.
+     */
+    private static final ByteString ODD_VALUE = ByteString.copyFrom(new byte[] {
+        (byte) 0x98, 0x06, 0x01, 0x08, 0x01, 0x08, 0x02,
+    });
+
+    @Test
+    void anAnyKeepsItsTypeUrlAndValueBytes() {
+        Any any = Any.newBuilder().setTypeUrl("type.googleapis.com/x.v1.Thing").setValue(ODD_VALUE).build();
+        GoogleMessages back = roundTrip(GoogleMessages.newBuilder()
+                .setAny(any)
+                .addAnys(any)
+                .addAnys(Any.getDefaultInstance())
+                .putAnyMap("k", any)
+                .build());
+        assertEquals(ODD_VALUE, back.getAny().getValue());
+        assertEquals(ODD_VALUE, back.getAnys(0).getValue());
+        assertEquals(ODD_VALUE, back.getAnyMapOrThrow("k").getValue());
+    }
+
+    @Test
+    void anAnyIsWrittenAsItsTwoFields() {
+        String text = GoogleMessagesPxfCodec.marshal(GoogleMessages.newBuilder()
+                .setAny(Any.newBuilder().setTypeUrl("t/x").setValue(ODD_VALUE))
+                .build());
+        assertTrue(text.contains("type_url = \"t/x\""), text);
+        assertTrue(text.contains("value = b\""), text);
+    }
+
+    @Test
+    void emptyAndFieldMask() {
+        roundTrip(GoogleMessages.newBuilder()
+                .setEmpty(Empty.getDefaultInstance())
+                .setMask(FieldMask.newBuilder().addPaths("a.b").addPaths("c"))
+                .build());
+    }
+
+    @Test
+    void structValueAndListValue() {
+        Value nested = Value.newBuilder().setListValue(ListValue.newBuilder()
+                .addValues(Value.newBuilder().setNumberValue(1.5))
+                .addValues(Value.newBuilder().setStringValue("s"))
+                .addValues(Value.newBuilder().setBoolValue(true))
+                .addValues(Value.newBuilder().setNullValue(NullValue.NULL_VALUE)))
+                .build();
+        Struct struct = Struct.newBuilder()
+                .putFields("n", Value.newBuilder().setNumberValue(2).build())
+                .putFields("l", nested)
+                .putFields("s", Value.newBuilder().setStructValue(Struct.newBuilder()
+                        .putFields("inner", Value.newBuilder().setStringValue("x").build())).build())
+                .build();
+        roundTrip(GoogleMessages.newBuilder()
+                .setStruct(struct)
+                .setValue(Value.newBuilder().setStructValue(struct))
+                .setList(nested.getListValue())
+                .build());
+    }
+
+    @Test
+    void aNullValueEnumField() {
+        // NULL_VALUE is 0, a plain enum's zero, so it is not written; the
+        // field reads back as its zero either way.
+        roundTrip(GoogleMessages.newBuilder().setNullValue(NullValue.NULL_VALUE).build());
+        // A Value whose kind is null_value has presence, so it is written.
+        GoogleMessages back = roundTrip(GoogleMessages.newBuilder()
+                .setValue(Value.newBuilder().setNullValue(NullValue.NULL_VALUE)).build());
+        assertEquals(Value.KindCase.NULL_VALUE, back.getValue().getKindCase());
+    }
+}
diff --git a/pxf-runtime/scripts/regen-wkt-companions.sh b/pxf-runtime/scripts/regen-wkt-companions.sh
new file mode 100755
index 0000000..1140ef3
--- /dev/null
+++ b/pxf-runtime/scripts/regen-wkt-companions.sh
@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2026 TrendVidia, LLC.
+#
+# Regenerates org.protowire.pxf.wkt: the PxfMeta and PxfEnum companions of the
+# google/protobuf types that PXF reads as ordinary messages (Any, Empty,
+# FieldMask, Struct, Value, ListValue, NullValue). protoc-gen-pxf-java-meta
+# points a field of one of these types here, since no build runs it over the
+# google files themselves (trendvidia/protowire#539). The files are the
+# plugin's own output for those files, with only the package line changed.
+#
+# Usage: regen-wkt-companions.sh <protowire checkout> [--check]
+#   --check  fail if the checked-in files differ from fresh output.
+set -euo pipefail
+
+spec=${1:?usage: $0 <protowire checkout> [--check]}
+mode=${2:-}
+here=$(cd "$(dirname "$0")/.." && pwd)
+dest=$here/src/main/java/org/protowire/pxf/wkt
+work=$(mktemp -d)
+trap 'rm -rf "$work"' EXIT
+
+(cd "$spec" && go build -o "$work/protoc-gen-pxf-java-meta" ./cmd/protoc-gen-pxf-java-meta)
+mkdir -p "$work/out"
+protoc --plugin=protoc-gen-pxf-java-meta="$work/protoc-gen-pxf-java-meta" \
+  --pxf-java-meta_out="$work/out" \
+  google/protobuf/any.proto google/protobuf/empty.proto \
+  google/protobuf/field_mask.proto google/protobuf/struct.proto
+
+mkdir -p "$work/wkt"
+for f in "$work"/out/com/google/protobuf/*.java; do
+  sed 's/^package com\.google\.protobuf;$/package org.protowire.pxf.wkt;/' "$f" > "$work/wkt/$(basename "$f")"
+done
+
+if [[ $mode == --check ]]; then
+  diff -r "$work/wkt" "$dest"
+  echo "org.protowire.pxf.wkt matches the plugin's output"
+else
+  rm -rf "$dest" && mkdir -p "$dest"
+  cp "$work"/wkt/*.java "$dest/"
+  ls "$dest"
+fi
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/AnyPxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/AnyPxfMeta.java
new file mode 100644
index 0000000..214a770
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/AnyPxfMeta.java
@@ -0,0 +1,131 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/any.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code Any}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code AnyPxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class AnyPxfMeta implements PxfMeta {
+    private AnyPxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final AnyPxfMeta INSTANCE = new AnyPxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.ofEntries(
+        Map.entry("type_url", 1),
+        Map.entry("value", 2)
+    );
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.ofEntries(
+        Map.entry(1, 9),
+        Map.entry(2, 12)
+    );
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.ofEntries(
+        Map.entry(1, 2),
+        Map.entry(2, 2)
+    );
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.of();
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of(1, 2);
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.of();
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.of();
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.of();
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.Any"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/EmptyPxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/EmptyPxfMeta.java
new file mode 100644
index 0000000..b29af8d
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/EmptyPxfMeta.java
@@ -0,0 +1,122 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/empty.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code Empty}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code EmptyPxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class EmptyPxfMeta implements PxfMeta {
+    private EmptyPxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final EmptyPxfMeta INSTANCE = new EmptyPxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.of();
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.of();
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.of();
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of();
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.of();
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.of();
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.of();
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.Empty"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/FieldMaskPxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/FieldMaskPxfMeta.java
new file mode 100644
index 0000000..84db372
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/FieldMaskPxfMeta.java
@@ -0,0 +1,128 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/field_mask.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code FieldMask}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code FieldMaskPxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class FieldMaskPxfMeta implements PxfMeta {
+    private FieldMaskPxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final FieldMaskPxfMeta INSTANCE = new FieldMaskPxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.ofEntries(
+        Map.entry("paths", 1)
+    );
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.ofEntries(
+        Map.entry(1, 9)
+    );
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.ofEntries(
+        Map.entry(1, 2)
+    );
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of(1);
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.of();
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of();
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.of();
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.of();
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.of();
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.FieldMask"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/ListValuePxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/ListValuePxfMeta.java
new file mode 100644
index 0000000..5fa0a83
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/ListValuePxfMeta.java
@@ -0,0 +1,132 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/struct.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code ListValue}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code ListValuePxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class ListValuePxfMeta implements PxfMeta {
+    private ListValuePxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final ListValuePxfMeta INSTANCE = new ListValuePxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.ofEntries(
+        Map.entry("values", 1)
+    );
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.ofEntries(
+        Map.entry(1, 11)
+    );
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.ofEntries(
+        Map.entry(1, 2)
+    );
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of(1);
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.ofEntries(
+        Map.entry(1, "com.google.protobuf.Value")
+    );
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.of();
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of();
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.of();
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.ofEntries(
+        Map.entry(1, org.protowire.pxf.wkt.ValuePxfMeta.INSTANCE)
+    );
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.of();
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.ListValue"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/NullValuePxfEnum.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/NullValuePxfEnum.java
new file mode 100644
index 0000000..0a2f978
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/NullValuePxfEnum.java
@@ -0,0 +1,37 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/struct.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+
+import org.protowire.pxf.PxfEnum;
+
+/**
+ * PXF enum value tables for {@code NullValue}.
+ *
+ * <p>Value-name → int and int → value-name lookups, lifted at codegen time
+ * so the runtime never needs descriptor reflection. Implements
+ * {@link PxfEnum} for runtime-side interface dispatch — pass {@code NullValuePxfEnum.INSTANCE}
+ * where a {@link PxfEnum} is expected.
+ */
+public final class NullValuePxfEnum implements PxfEnum {
+    private NullValuePxfEnum() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfEnum}. */
+    public static final NullValuePxfEnum INSTANCE = new NullValuePxfEnum();
+
+    /** Enum value name → integer. */
+    public static final Map<String, Integer> VALUES = Map.ofEntries(
+        Map.entry("NULL_VALUE", 0)
+    );
+
+    /** Integer → enum value name. Aliased values map to the first declaration. */
+    public static final Map<Integer, String> NAMES = Map.ofEntries(
+        Map.entry(0, "NULL_VALUE")
+    );
+
+    @Override public String                fullName() { return "google.protobuf.NullValue"; }
+    @Override public Map<String, Integer>  values()   { return VALUES; }
+    @Override public Map<Integer, String>  names()    { return NAMES; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/StructPxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/StructPxfMeta.java
new file mode 100644
index 0000000..d92eec4
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/StructPxfMeta.java
@@ -0,0 +1,132 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/struct.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code Struct}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code StructPxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class StructPxfMeta implements PxfMeta {
+    private StructPxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final StructPxfMeta INSTANCE = new StructPxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.ofEntries(
+        Map.entry("fields", 1)
+    );
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.ofEntries(
+        Map.entry(1, 11)
+    );
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.ofEntries(
+        Map.entry(1, 2)
+    );
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of(1);
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.ofEntries(
+        Map.entry(1, "com.google.protobuf.Struct.FieldsEntry")
+    );
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.of();
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of();
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.of();
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of(1);
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.ofEntries(
+        Map.entry(1, org.protowire.pxf.wkt.Struct_FieldsEntryPxfMeta.INSTANCE)
+    );
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.of();
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.Struct"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/Struct_FieldsEntryPxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/Struct_FieldsEntryPxfMeta.java
new file mode 100644
index 0000000..82e5405
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/Struct_FieldsEntryPxfMeta.java
@@ -0,0 +1,135 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/struct.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code Struct.FieldsEntry}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code Struct_FieldsEntryPxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class Struct_FieldsEntryPxfMeta implements PxfMeta {
+    private Struct_FieldsEntryPxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final Struct_FieldsEntryPxfMeta INSTANCE = new Struct_FieldsEntryPxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.ofEntries(
+        Map.entry("key", 1),
+        Map.entry("value", 2)
+    );
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.ofEntries(
+        Map.entry(1, 9),
+        Map.entry(2, 11)
+    );
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.ofEntries(
+        Map.entry(1, 2),
+        Map.entry(2, 2)
+    );
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.ofEntries(
+        Map.entry(2, "com.google.protobuf.Value")
+    );
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.of();
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of(2);
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of(1);
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.of();
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.ofEntries(
+        Map.entry(2, org.protowire.pxf.wkt.ValuePxfMeta.INSTANCE)
+    );
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.of();
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.Struct.FieldsEntry"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}
diff --git a/pxf-runtime/src/main/java/org/protowire/pxf/wkt/ValuePxfMeta.java b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/ValuePxfMeta.java
new file mode 100644
index 0000000..d3907f8
--- /dev/null
+++ b/pxf-runtime/src/main/java/org/protowire/pxf/wkt/ValuePxfMeta.java
@@ -0,0 +1,160 @@
+// Generated by protoc-gen-pxf-java-meta. DO NOT EDIT.
+// source: google/protobuf/struct.proto
+
+package org.protowire.pxf.wkt;
+
+import java.util.Map;
+import java.util.Set;
+
+import org.protowire.pxf.PxfEnum;
+import org.protowire.pxf.PxfMeta;
+
+/**
+ * PXF / SBE descriptor metadata for {@code Value}, lifted at
+ * codegen time so the runtime never needs descriptor reflection.
+ *
+ * <p>Implements {@link PxfMeta} so the protobuf-javalite runtime can dispatch
+ * through the interface — pass {@code ValuePxfMeta.INSTANCE} where a {@code PxfMeta}
+ * is expected. The static {@code FIELD_NUMBERS}, {@code FIELD_KINDS}, etc.
+ * fields remain public for direct access by static-only consumers.
+ */
+public final class ValuePxfMeta implements PxfMeta {
+    private ValuePxfMeta() {}
+
+    /** Singleton; pass to runtime APIs that take a {@link PxfMeta}. */
+    public static final ValuePxfMeta INSTANCE = new ValuePxfMeta();
+
+    /** Field name → field number, in declaration order. */
+    public static final Map<String, Integer> FIELD_NUMBERS = Map.ofEntries(
+        Map.entry("null_value", 1),
+        Map.entry("number_value", 2),
+        Map.entry("string_value", 3),
+        Map.entry("bool_value", 4),
+        Map.entry("struct_value", 5),
+        Map.entry("list_value", 6)
+    );
+
+    /**
+     * Field number → proto kind integer. Values follow
+     * {@code google.protobuf.FieldDescriptorProto.Type} (1..18, e.g. 9 = STRING,
+     * 11 = MESSAGE, 14 = ENUM).
+     */
+    public static final Map<Integer, Integer> FIELD_KINDS = Map.ofEntries(
+        Map.entry(1, 14),
+        Map.entry(2, 1),
+        Map.entry(3, 9),
+        Map.entry(4, 8),
+        Map.entry(5, 11),
+        Map.entry(6, 11)
+    );
+
+    /** Field number → wire type integer (0=varint, 1=i64, 2=length-delimited, 5=i32). */
+    public static final Map<Integer, Integer> WIRE_TYPES = Map.ofEntries(
+        Map.entry(1, 0),
+        Map.entry(2, 1),
+        Map.entry(3, 2),
+        Map.entry(4, 0),
+        Map.entry(5, 2),
+        Map.entry(6, 2)
+    );
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> REPEATED_FIELDS = Set.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> PACKED_FIELDS = Set.of();
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> MESSAGE_TYPES = Map.ofEntries(
+        Map.entry(5, "com.google.protobuf.Struct"),
+        Map.entry(6, "com.google.protobuf.ListValue")
+    );
+
+    /** Field number → fully-qualified Java class name, for fields of the matching kind. */
+    public static final Map<Integer, String> ENUM_TYPES = Map.ofEntries(
+        Map.entry(1, "com.google.protobuf.NullValue")
+    );
+
+    /** Field numbers marked {@code [(pxf.required) = true]} or {@code @required}. */
+    public static final Set<Integer> REQUIRED_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code (pxf.default)} or {@code @default} literal. Values are PXF text
+     * literals (e.g. {@code "42"}, {@code "true"}, {@code "\"hi\""}); the
+     * runtime feeds them through the PXF lexer to resolve to typed values.
+     */
+    public static final Map<Integer, String> DEFAULTS = Map.of();
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> NULLABLE_FIELDS = Set.of(1, 2, 3, 4, 5, 6);
+
+    /** Field numbers matching the predicate (see Javadoc on each constant). */
+    public static final Set<Integer> IMPLICIT_PRESENCE_FIELDS = Set.of();
+
+    /** Field number → {@code (pxf.key)} key field name, for keyed repeated fields. */
+    public static final Map<Integer, String> KEY_FIELDS = Map.of();
+
+    /** {@code (sbe.template_id)} value, or -1 if unset. */
+    public static final int SBE_TEMPLATE_ID = -1;
+
+    /** Field number → {@code (sbe.length)} byte length, where set. */
+    public static final Map<Integer, Integer> SBE_FIELD_LENGTHS = Map.of();
+
+    /** Field number → {@code (sbe.encoding)} primitive name, where set. */
+    public static final Map<Integer, String> SBE_FIELD_ENCODINGS = Map.of();
+
+    /**
+     * Field number → declaring oneof name, for fields inside a user-declared
+     * {@code oneof} block. Synthetic oneofs around proto3 {@code optional}
+     * fields are excluded.
+     */
+    public static final Map<Integer, String> ONEOF_OF = Map.ofEntries(
+        Map.entry(1, "kind"),
+        Map.entry(2, "kind"),
+        Map.entry(3, "kind"),
+        Map.entry(4, "kind"),
+        Map.entry(5, "kind"),
+        Map.entry(6, "kind")
+    );
+
+    /** Field numbers declared as {@code map<K, V>} in the source .proto. */
+    public static final Set<Integer> MAP_FIELDS = Set.of();
+
+    /**
+     * Field number → {@code PxfMeta.WKT_*} kind constant for fields whose
+     * target message is a recognized well-known type.
+     */
+    public static final Map<Integer, Integer> WELL_KNOWN_KINDS = Map.of();
+
+    /** Field number → nested {@link PxfMeta} INSTANCE for MESSAGE-kind fields. */
+    public static final Map<Integer, PxfMeta> NESTED_METAS = Map.ofEntries(
+        Map.entry(5, org.protowire.pxf.wkt.StructPxfMeta.INSTANCE),
+        Map.entry(6, org.protowire.pxf.wkt.ListValuePxfMeta.INSTANCE)
+    );
+
+    /** Field number → {@link PxfEnum} INSTANCE for ENUM-kind fields. */
+    public static final Map<Integer, PxfEnum> ENUM_METAS = Map.ofEntries(
+        Map.entry(1, org.protowire.pxf.wkt.NullValuePxfEnum.INSTANCE)
+    );
+
+    @Override public Map<String, Integer>  fieldNumbers()      { return FIELD_NUMBERS; }
+    @Override public Map<Integer, Integer> fieldKinds()        { return FIELD_KINDS; }
+    @Override public Map<Integer, Integer> wireTypes()         { return WIRE_TYPES; }
+    @Override public Set<Integer>          repeatedFields()    { return REPEATED_FIELDS; }
+    @Override public Set<Integer>          packedFields()      { return PACKED_FIELDS; }
+    @Override public Map<Integer, String>  messageTypes()      { return MESSAGE_TYPES; }
+    @Override public Map<Integer, String>  enumTypes()         { return ENUM_TYPES; }
+    @Override public Set<Integer>          requiredFields()    { return REQUIRED_FIELDS; }
+    @Override public Map<Integer, String>  defaults()          { return DEFAULTS; }
+    public Set<Integer>                    nullableFields()    { return NULLABLE_FIELDS; }
+    public Set<Integer>                    implicitPresenceFields() { return IMPLICIT_PRESENCE_FIELDS; }
+    @Override public int                   sbeTemplateId()     { return SBE_TEMPLATE_ID; }
+    @Override public Map<Integer, Integer> sbeFieldLengths()   { return SBE_FIELD_LENGTHS; }
+    @Override public Map<Integer, String>  sbeFieldEncodings() { return SBE_FIELD_ENCODINGS; }
+    @Override public Map<Integer, String>  oneofOf()           { return ONEOF_OF; }
+    @Override public String                fullName()          { return "google.protobuf.Value"; }
+    @Override public Map<Integer, PxfMeta> nestedMetas()       { return NESTED_METAS; }
+    @Override public Map<Integer, PxfEnum> enumMetas()         { return ENUM_METAS; }
+    @Override public Set<Integer>          mapFields()         { return MAP_FIELDS; }
+    @Override public Map<Integer, Integer> wellKnownKinds()    { return WELL_KNOWN_KINDS; }
+}