diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..097f9f9
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/.gitignore b/.gitignore
index 9154f4c..c476faf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,26 +1,40 @@
-# ---> Java
-# Compiled class file
-*.class
+# gradle
 
-# Log file
-*.log
+.gradle/
+build/
+out/
+classes/
 
-# BlueJ files
-*.ctxt
+# eclipse
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
+*.launch
 
-# Package Files #
-*.jar
-*.war
-*.nar
-*.ear
-*.zip
-*.tar.gz
-*.rar
+# idea
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
-replay_pid*
+.idea/
+*.iml
+*.ipr
+*.iws
 
+# vscode
+
+.settings/
+.vscode/
+bin/
+.classpath
+.project
+
+# macos
+
+*.DS_Store
+
+# fabric
+
+run/
+
+# java
+
+hs_err_*.log
+replay_*.log
+*.hprof
+*.jfr
diff --git a/README.md b/README.md
index 3ee1d24..233307a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,58 @@
-# emote
+# emotes
 
-A powerful emote library for Saturn Client, with bending
\ No newline at end of file
+A player emote library for Saturn Client, with limb bending.
+
+## Layout
+
+- `core/`: Minecraft-independent animation model (`Bone`, `BoneTransform`, `Pose`, `Animation`,
+  `AnimationPlayer`). Plain Java 21 with JUnit tests. Published as `org.saturnclient:emotes-core`.
+- `src/main/`: the Fabric mod that puts poses on player models. It's built once per Minecraft
+  version with [Stonecutter](https://stonecutter.kikugie.dev/) and published as
+  `org.saturnclient:emotes-fabric:<version>+<mc>`, with `core` bundled inside the jar.
+- `src/testmod/`: a dev-only tester mod that is never published. It adds `/emotes play <name>`,
+  `/emotes stop` and `/emotes info`. Press F5 to see yourself.
+
+Supported versions: 1.21.4 to 1.21.11, the same range as Saturn Client. Each version's Fabric API
+version is set in `stonecutter.properties.toml`. The code uses Mojang mappings.
+
+## How it hooks in
+
+1. `LivingEntityRendererMixin` samples the entity's current pose into its render state (players only).
+2. `HumanoidModelMixin` applies that pose at the end of `HumanoidModel.setupAnim`. `PlayerModel`
+   and the armor layers both go through this method, so armor follows the pose.
+
+Both hook points exist unchanged in every supported version. Version-specific code goes behind
+Stonecutter comments:
+
+```java
+//? if >=1.21.9 {
+import net.minecraft.client.renderer.entity.state.AvatarRenderState;
+//?} else
+/*import net.minecraft.client.renderer.entity.state.PlayerRenderState;*/
+```
+
+Bending (`BoneTransform.bend` / `bendAxis`) is part of the model but isn't rendered yet.
+
+## Commands
+
+```sh
+./gradlew :core:test                      # core unit tests
+./gradlew :1.21.11:runTestmodClient       # launch the game with the tester (run dir: ./run)
+./gradlew :1.21.4:compileTestmodJava      # quick compile check for one version
+./gradlew buildAll                        # every version's jar → build/libs/<version>/
+GITEA_TOKEN=... ./gradlew publish         # publish core + every version to Gitea
+```
+
+The active version is set in `stonecutter.gradle.kts` (`stonecutter active "..."`), and it's the
+version whose code is uncommented in `src/`. Switch versions with the Stonecutter IntelliJ plugin
+or the `Set active project to <v>` Gradle task. Run `Reset active project` before committing, so
+the tree is committed with `vcsVersion` (1.21.11) active.
+
+Loom 1.18 needs a Java 25 JVM to run Gradle, so the build is pinned to Loom 1.17 until the
+toolchain moves. Minecraft 26.x will need that upgrade.
+
+## Publishing
+
+Artifacts go to the `saturnclientmc` organization's Maven registry:
+`https://git.selimaj.dev/api/packages/saturnclientmc/maven`. Use a token with `package:write`, set
+as `GITEA_TOKEN` or `-PgiteaToken=...`.
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..c5c1bfa
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,115 @@
+// Build script for each Minecraft version node (versions/<mc>/). The root project itself
+// is configured by stonecutter.gradle.kts.
+plugins {
+    // Applies the right Loom variant for the node's Minecraft version.
+    id("dev.kikugie.loom-back-compat")
+    `maven-publish`
+}
+
+// DO NOT set group = ...! (Stonecutter/loom-back-compat reads mod.group.)
+val modVersion = property("mod.version") as String
+version = "$modVersion+${sc.current.version}"
+base.archivesName = "emotes-fabric"
+
+val requiredJava: JavaVersion = when {
+    sc.current.parsed >= "26.1" -> JavaVersion.VERSION_25
+    else -> JavaVersion.VERSION_21
+}
+
+val testmod: SourceSet = sourceSets.create("testmod") {
+    compileClasspath += sourceSets.main.get().compileClasspath + sourceSets.main.get().output
+    runtimeClasspath += sourceSets.main.get().runtimeClasspath + sourceSets.main.get().output
+}
+
+loom {
+    createRemapConfigurations(testmod)
+
+    mods {
+        register("saturn_emotes") { sourceSet(sourceSets.main.get()) }
+        register("saturn_emotes_testmod") { sourceSet(testmod) }
+    }
+
+    decompilerOptions.named("vineflower") {
+        options.put("mark-corresponding-synthetics", "1") // Names lambdas, useful for mixins
+    }
+
+    runs {
+        // ./gradlew :<mc>:runTestmodClient launches the game with the tester mod loaded.
+        register("testmodClient") {
+            client()
+            name = "Testmod Client"
+            source(testmod)
+        }
+    }
+
+    runConfigs.all {
+        preferGradleTask = true
+        generateRunConfig = true
+        runDirectory = rootProject.file("run") // Shared by every version
+        jvmArguments.add("-Dmixin.debug.export=true")
+    }
+}
+
+dependencies {
+    fun fapi(vararg modules: String) {
+        for (it in modules) modImplementation(fabricApi.module(it, sc.properties["deps.fabric_api"]))
+    }
+
+    minecraft("com.mojang:minecraft:${sc.current.version}")
+    loomx.applyMojangMappings()
+
+    modImplementation("net.fabricmc:fabric-loader:${property("deps.fabric_loader")}")
+    fapi("fabric-api-base", "fabric-lifecycle-events-v1")
+
+    // The core is Minecraft-independent; ship it inside the mod jar.
+    api(project(":core"))
+    include(project(":core"))
+
+    "modTestmodImplementation"(fabricApi.module("fabric-command-api-v2", sc.properties["deps.fabric_api"]))
+}
+
+java {
+    withSourcesJar()
+    targetCompatibility = requiredJava
+    sourceCompatibility = requiredJava
+    toolchain.languageVersion = JavaLanguageVersion.of(requiredJava.majorVersion)
+}
+
+tasks {
+    val props = mapOf(
+        "id" to sc.properties["mod.id"],
+        "name" to sc.properties["mod.name"],
+        "version" to version.toString(),
+        "minecraft" to sc.properties["mod.mc_compat"],
+        "loader" to Regex("\\d+\\.\\d+").find(sc.properties.get<String>("deps.fabric_loader"))!!.value,
+        "java" to "JAVA_${requiredJava.majorVersion}",
+    )
+
+    withType<ProcessResources>().configureEach {
+        inputs.properties(props)
+        filesMatching(listOf("fabric.mod.json", "*.mixins.json")) { expand(props) }
+    }
+
+    withType<Jar>().configureEach {
+        from(rootProject.file("LICENSE")) { rename { "${it}_saturn_emotes" } }
+    }
+
+    register<Copy>("buildAndCollect") {
+        group = "build"
+        description = "Builds the mod jar and copies it to build/libs/<mod version>/ in the root project"
+        from(loomx.modJar.flatMap { it.archiveFile })
+        into(rootProject.layout.buildDirectory.dir("libs/$modVersion"))
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            groupId = property("mod.group") as String
+            artifactId = "emotes-fabric"
+            from(components["java"])
+        }
+    }
+}
+
+apply(from = rootProject.file("gradle/gitea.gradle.kts"))
diff --git a/core/build.gradle.kts b/core/build.gradle.kts
new file mode 100644
index 0000000..d974baf
--- /dev/null
+++ b/core/build.gradle.kts
@@ -0,0 +1,38 @@
+plugins {
+    `java-library`
+    `maven-publish`
+}
+
+group = "org.saturnclient"
+version = rootProject.property("mod.version") as String
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation(platform("org.junit:junit-bom:5.13.4"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+java {
+    // Kept at 21 so it runs on every supported Minecraft version.
+    toolchain.languageVersion = JavaLanguageVersion.of(21)
+    withSourcesJar()
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven") {
+            artifactId = "emotes-core"
+            from(components["java"])
+        }
+    }
+}
+
+apply(from = rootProject.file("gradle/gitea.gradle.kts"))
diff --git a/core/src/main/java/org/saturnclient/emotes/core/Animation.java b/core/src/main/java/org/saturnclient/emotes/core/Animation.java
new file mode 100644
index 0000000..88c6a9f
--- /dev/null
+++ b/core/src/main/java/org/saturnclient/emotes/core/Animation.java
@@ -0,0 +1,17 @@
+package org.saturnclient.emotes.core;
+
+/** Something that produces a {@link Pose} for any point in time. */
+public interface Animation {
+    /**
+     * @param tick time since the animation started, in game ticks (20 per second). Fractional
+     *             values come from the render partial tick.
+     */
+    Pose sample(float tick);
+
+    /** Length in ticks. Looping animations repeat after this, others end. */
+    float length();
+
+    default boolean loops() {
+        return false;
+    }
+}
diff --git a/core/src/main/java/org/saturnclient/emotes/core/AnimationPlayer.java b/core/src/main/java/org/saturnclient/emotes/core/AnimationPlayer.java
new file mode 100644
index 0000000..d1ecbf8
--- /dev/null
+++ b/core/src/main/java/org/saturnclient/emotes/core/AnimationPlayer.java
@@ -0,0 +1,37 @@
+package org.saturnclient.emotes.core;
+
+/** Plays one {@link Animation} from a fixed start tick. */
+public final class AnimationPlayer {
+    private final Animation animation;
+    private final long startTick;
+
+    public AnimationPlayer(Animation animation, long startTick) {
+        this.animation = animation;
+        this.startTick = startTick;
+    }
+
+    public Animation animation() {
+        return animation;
+    }
+
+    /** Elapsed animation time, wrapped for looping animations. */
+    public float time(long tick, float partialTick) {
+        float elapsed = Math.max(0, tick - startTick + partialTick);
+        float length = animation.length();
+        if (animation.loops() && length > 0) {
+            return elapsed % length;
+        }
+        return Math.min(elapsed, length);
+    }
+
+    public boolean isFinished(long tick) {
+        return !animation.loops() && tick - startTick >= animation.length();
+    }
+
+    public Pose sample(long tick, float partialTick) {
+        if (isFinished(tick)) {
+            return Pose.EMPTY;
+        }
+        return animation.sample(time(tick, partialTick));
+    }
+}
diff --git a/core/src/main/java/org/saturnclient/emotes/core/Bone.java b/core/src/main/java/org/saturnclient/emotes/core/Bone.java
new file mode 100644
index 0000000..7339f95
--- /dev/null
+++ b/core/src/main/java/org/saturnclient/emotes/core/Bone.java
@@ -0,0 +1,11 @@
+package org.saturnclient.emotes.core;
+
+/** The parts of the player model an animation can move. */
+public enum Bone {
+    HEAD,
+    BODY,
+    RIGHT_ARM,
+    LEFT_ARM,
+    RIGHT_LEG,
+    LEFT_LEG
+}
diff --git a/core/src/main/java/org/saturnclient/emotes/core/BoneTransform.java b/core/src/main/java/org/saturnclient/emotes/core/BoneTransform.java
new file mode 100644
index 0000000..da387fa
--- /dev/null
+++ b/core/src/main/java/org/saturnclient/emotes/core/BoneTransform.java
@@ -0,0 +1,24 @@
+package org.saturnclient.emotes.core;
+
+/**
+ * How one bone is posed. Offsets are in model pixels (1/16 block) relative to the bone's default
+ * pivot, rotations are in radians and replace the vanilla rotation.
+ *
+ * @param bend     how far the lower half of the limb (forearm, shin, lower torso) folds, in radians
+ * @param bendAxis the direction the limb folds in, as an angle around the limb's long axis
+ */
+public record BoneTransform(
+        float x, float y, float z,
+        float pitch, float yaw, float roll,
+        float bend, float bendAxis) {
+
+    public static final BoneTransform IDENTITY = new BoneTransform(0, 0, 0, 0, 0, 0, 0, 0);
+
+    public static BoneTransform rotation(float pitch, float yaw, float roll) {
+        return new BoneTransform(0, 0, 0, pitch, yaw, roll, 0, 0);
+    }
+
+    public BoneTransform withBend(float bend, float bendAxis) {
+        return new BoneTransform(x, y, z, pitch, yaw, roll, bend, bendAxis);
+    }
+}
diff --git a/core/src/main/java/org/saturnclient/emotes/core/Pose.java b/core/src/main/java/org/saturnclient/emotes/core/Pose.java
new file mode 100644
index 0000000..3d33a33
--- /dev/null
+++ b/core/src/main/java/org/saturnclient/emotes/core/Pose.java
@@ -0,0 +1,48 @@
+package org.saturnclient.emotes.core;
+
+import java.util.EnumMap;
+import java.util.Map;
+import java.util.Optional;
+
+/** An immutable snapshot of bone transforms. Bones without a transform keep their vanilla pose. */
+public final class Pose {
+    public static final Pose EMPTY = new Pose(new EnumMap<>(Bone.class));
+
+    private final EnumMap<Bone, BoneTransform> bones;
+
+    private Pose(EnumMap<Bone, BoneTransform> bones) {
+        this.bones = bones;
+    }
+
+    public Optional<BoneTransform> get(Bone bone) {
+        return Optional.ofNullable(bones.get(bone));
+    }
+
+    public Map<Bone, BoneTransform> bones() {
+        return Map.copyOf(bones);
+    }
+
+    public boolean isEmpty() {
+        return bones.isEmpty();
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static final class Builder {
+        private final EnumMap<Bone, BoneTransform> bones = new EnumMap<>(Bone.class);
+
+        private Builder() {
+        }
+
+        public Builder set(Bone bone, BoneTransform transform) {
+            bones.put(bone, transform);
+            return this;
+        }
+
+        public Pose build() {
+            return bones.isEmpty() ? EMPTY : new Pose(new EnumMap<>(bones));
+        }
+    }
+}
diff --git a/core/src/test/java/org/saturnclient/emotes/core/AnimationPlayerTest.java b/core/src/test/java/org/saturnclient/emotes/core/AnimationPlayerTest.java
new file mode 100644
index 0000000..5bf39c8
--- /dev/null
+++ b/core/src/test/java/org/saturnclient/emotes/core/AnimationPlayerTest.java
@@ -0,0 +1,60 @@
+package org.saturnclient.emotes.core;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class AnimationPlayerTest {
+    /** Rotates the head by one radian per tick. */
+    private static Animation headSpin(float length, boolean loops) {
+        return new Animation() {
+            @Override
+            public Pose sample(float tick) {
+                return Pose.builder().set(Bone.HEAD, BoneTransform.rotation(0, tick, 0)).build();
+            }
+
+            @Override
+            public float length() {
+                return length;
+            }
+
+            @Override
+            public boolean loops() {
+                return loops;
+            }
+        };
+    }
+
+    private static float headYaw(Pose pose) {
+        return pose.get(Bone.HEAD).orElseThrow().yaw();
+    }
+
+    @Test
+    void samplesRelativeToStartTick() {
+        AnimationPlayer player = new AnimationPlayer(headSpin(20, false), 100);
+        assertEquals(5.5f, headYaw(player.sample(105, 0.5f)), 1e-6);
+    }
+
+    @Test
+    void finishesAfterLength() {
+        AnimationPlayer player = new AnimationPlayer(headSpin(20, false), 100);
+        assertFalse(player.isFinished(119));
+        assertTrue(player.isFinished(120));
+        assertTrue(player.sample(120, 0).isEmpty());
+    }
+
+    @Test
+    void loopingAnimationsWrap() {
+        AnimationPlayer player = new AnimationPlayer(headSpin(20, true), 0);
+        assertFalse(player.isFinished(1_000));
+        assertEquals(5f, headYaw(player.sample(45, 0)), 1e-6);
+    }
+
+    @Test
+    void timeBeforeStartClampsToZero() {
+        AnimationPlayer player = new AnimationPlayer(headSpin(20, false), 100);
+        assertEquals(0f, player.time(90, 0), 1e-6);
+    }
+}
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..a8c7207
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,5 @@
+# Gradle options only; mod and dependency versions live in stonecutter.properties.toml.
+org.gradle.jvmargs=-Xmx2G
+org.gradle.parallel=true
+org.gradle.caching=true
+org.gradle.configuration-cache=true
diff --git a/gradle/gitea.gradle.kts b/gradle/gitea.gradle.kts
new file mode 100644
index 0000000..b683461
--- /dev/null
+++ b/gradle/gitea.gradle.kts
@@ -0,0 +1,17 @@
+// Shared publishing target: the saturnclientmc org's Maven registry on Gitea.
+// Publish with a token that has package:write:  GITEA_TOKEN=... ./gradlew publish
+configure<PublishingExtension> {
+    repositories {
+        maven {
+            name = "Gitea"
+            url = uri("https://git.selimaj.dev/api/packages/saturnclientmc/maven")
+            credentials(HttpHeaderCredentials::class) {
+                name = "Authorization"
+                value = "token ${findProperty("giteaToken") ?: System.getenv("GITEA_TOKEN") ?: ""}"
+            }
+            authentication {
+                create<HttpHeaderAuthentication>("header")
+            }
+        }
+    }
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..5097068
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..9b7cb4a
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,9 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.8.0-bin.zip
+networkTimeout=10000
+retries=0
+retryBackOffMs=500
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..249efbb
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   gradlew start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh gradlew
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/3d91ce3b8caaf77ad09f381f43615b715b53f72c/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..3185a43
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,112 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  gradlew startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables, and ensure extensions are enabled
+setlocal EnableExtensions
+
+@rem Catch executions from older scripts and ensure they exit cleanly.
+@rem This can be removed once we can be reasonably confident that few people
+@rem will be migrating directly to this new wrapper.
+goto afterSafetyNet
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+goto exitWithErrorLevel
+:afterSafetyNet
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+1>&2 echo.
+1>&2 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+1>&2 echo.
+1>&2 echo Please set the JAVA_HOME variable in your environment to match the
+1>&2 echo location of your Java installation.
+
+"%COMSPEC%" /c exit 1
+goto exitWithErrorLevel
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+1>&2 echo.
+1>&2 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+1>&2 echo.
+1>&2 echo Please set the JAVA_HOME variable in your environment to match the
+1>&2 echo location of your Java installation.
+
+"%COMSPEC%" /c exit 1
+goto exitWithErrorLevel
+
+:execute
+@rem Setup the command line
+
+
+
+@rem Execute gradlew
+@rem endlocal doesn't take effect until after the line is parsed and variables are expanded
+@rem which allows us to clear the local environment before executing the java command
+endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel & goto exitWithErrorLevel
+
+@rem This label must not be changed. We rely on old scripts being able to jump to this point.
+:exitWithErrorLevel
+@rem Use "%COMSPEC%" /c exit to allow operators to work properly in scripts
+"%COMSPEC%" /c exit %ERRORLEVEL%
diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..97d2509
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,28 @@
+pluginManagement {
+    repositories {
+        mavenCentral()
+        gradlePluginPortal()
+        maven("https://maven.fabricmc.net/")
+        maven("https://maven.kikugie.dev/releases") { name = "KikuGie Releases" }
+        maven("https://maven.kikugie.dev/snapshots") { name = "KikuGie Snapshots" }
+    }
+}
+
+plugins {
+    id("dev.kikugie.stonecutter") version "0.9.8"
+    // Picks the right Loom variant per Minecraft version (remapping for 1.21.x, plain for 26.1+).
+    id("dev.kikugie.loom-back-compat") version "0.4.2"
+}
+
+stonecutter {
+    create(rootProject) {
+        // Same range as Saturn Client. Per-version dependencies live in stonecutter.properties.toml.
+        versions("1.21.4", "1.21.5", "1.21.6", "1.21.7", "1.21.8", "1.21.9", "1.21.10", "1.21.11")
+        vcsVersion = "1.21.11"
+    }
+}
+
+rootProject.name = "emotes"
+
+// Minecraft-independent animation code, shared by every version node.
+include("core")
diff --git a/src/main/java/org/saturnclient/emotes/fabric/Emotes.java b/src/main/java/org/saturnclient/emotes/fabric/Emotes.java
new file mode 100644
index 0000000..957fd76
--- /dev/null
+++ b/src/main/java/org/saturnclient/emotes/fabric/Emotes.java
@@ -0,0 +1,56 @@
+package org.saturnclient.emotes.fabric;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.saturnclient.emotes.core.Animation;
+import org.saturnclient.emotes.core.AnimationPlayer;
+import org.saturnclient.emotes.core.Pose;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
+
+/** Client-side entry point: which player is playing which animation. */
+public final class Emotes implements ClientModInitializer {
+    public static final String MOD_ID = "saturn_emotes";
+    public static final String VERSION = /*$ mod_version*/ "0.1.0";
+    public static final Logger LOGGER = LoggerFactory.getLogger(MOD_ID);
+
+    private static final Map<UUID, AnimationPlayer> PLAYING = new ConcurrentHashMap<>();
+    private static long tick;
+
+    @Override
+    public void onInitializeClient() {
+        ClientTickEvents.END_CLIENT_TICK.register(client -> {
+            tick++;
+            PLAYING.values().removeIf(player -> player.isFinished(tick));
+        });
+    }
+
+    /** Starts {@code animation} on the player, replacing whatever they were playing. */
+    public static void play(UUID player, Animation animation) {
+        PLAYING.put(player, new AnimationPlayer(animation, tick));
+    }
+
+    public static void stop(UUID player) {
+        PLAYING.remove(player);
+    }
+
+    public static void stopAll() {
+        PLAYING.clear();
+    }
+
+    public static Optional<AnimationPlayer> playing(UUID player) {
+        return Optional.ofNullable(PLAYING.get(player));
+    }
+
+    /** The pose to render for this player this frame, or {@link Pose#EMPTY}. */
+    public static Pose sample(UUID player, float partialTick) {
+        AnimationPlayer animation = PLAYING.get(player);
+        return animation == null ? Pose.EMPTY : animation.sample(tick, partialTick);
+    }
+}
diff --git a/src/main/java/org/saturnclient/emotes/fabric/PoseApplier.java b/src/main/java/org/saturnclient/emotes/fabric/PoseApplier.java
new file mode 100644
index 0000000..150024b
--- /dev/null
+++ b/src/main/java/org/saturnclient/emotes/fabric/PoseApplier.java
@@ -0,0 +1,45 @@
+package org.saturnclient.emotes.fabric;
+
+import org.saturnclient.emotes.core.Bone;
+import org.saturnclient.emotes.core.BoneTransform;
+import org.saturnclient.emotes.core.Pose;
+
+import net.minecraft.client.model.HumanoidModel;
+import net.minecraft.client.model.geom.ModelPart;
+
+/**
+ * Writes a {@link Pose} onto a humanoid model after vanilla has posed it. Overlay parts (hat, sleeves,
+ * jacket, pants) are children of the base parts, so they follow automatically.
+ */
+public final class PoseApplier {
+    private PoseApplier() {
+    }
+
+    public static void apply(HumanoidModel<?> model, Pose pose) {
+        for (var entry : pose.bones().entrySet()) {
+            apply(part(model, entry.getKey()), entry.getValue());
+        }
+    }
+
+    private static ModelPart part(HumanoidModel<?> model, Bone bone) {
+        return switch (bone) {
+            case HEAD -> model.head;
+            case BODY -> model.body;
+            case RIGHT_ARM -> model.rightArm;
+            case LEFT_ARM -> model.leftArm;
+            case RIGHT_LEG -> model.rightLeg;
+            case LEFT_LEG -> model.leftLeg;
+        };
+    }
+
+    private static void apply(ModelPart part, BoneTransform transform) {
+        // The model's pose was reset to its defaults before setupAnim, so offsets are relative to those.
+        part.x += transform.x();
+        part.y += transform.y();
+        part.z += transform.z();
+        part.xRot = transform.pitch();
+        part.yRot = transform.yaw();
+        part.zRot = transform.roll();
+        // TODO: bend (transform.bend(), transform.bendAxis()) needs a custom mesh.
+    }
+}
diff --git a/src/main/java/org/saturnclient/emotes/fabric/access/EmotePoseHolder.java b/src/main/java/org/saturnclient/emotes/fabric/access/EmotePoseHolder.java
new file mode 100644
index 0000000..8923de0
--- /dev/null
+++ b/src/main/java/org/saturnclient/emotes/fabric/access/EmotePoseHolder.java
@@ -0,0 +1,10 @@
+package org.saturnclient.emotes.fabric.access;
+
+import org.saturnclient.emotes.core.Pose;
+
+/** Mixed into render states so the model knows the pose of the entity it's drawing. */
+public interface EmotePoseHolder {
+    Pose saturnEmotes$getPose();
+
+    void saturnEmotes$setPose(Pose pose);
+}
diff --git a/src/main/java/org/saturnclient/emotes/fabric/mixin/HumanoidModelMixin.java b/src/main/java/org/saturnclient/emotes/fabric/mixin/HumanoidModelMixin.java
new file mode 100644
index 0000000..b46bd77
--- /dev/null
+++ b/src/main/java/org/saturnclient/emotes/fabric/mixin/HumanoidModelMixin.java
@@ -0,0 +1,29 @@
+package org.saturnclient.emotes.fabric.mixin;
+
+import org.saturnclient.emotes.core.Pose;
+import org.saturnclient.emotes.fabric.PoseApplier;
+import org.saturnclient.emotes.fabric.access.EmotePoseHolder;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import net.minecraft.client.model.HumanoidModel;
+import net.minecraft.client.renderer.entity.state.HumanoidRenderState;
+
+/**
+ * PlayerModel.setupAnim ends by calling this, and armor layers call it with the same state,
+ * so the player and their armor both get the pose.
+ */
+@Mixin(HumanoidModel.class)
+public class HumanoidModelMixin {
+    @Inject(
+            method = "setupAnim(Lnet/minecraft/client/renderer/entity/state/HumanoidRenderState;)V",
+            at = @At("TAIL"))
+    private void saturnEmotes$applyPose(HumanoidRenderState state, CallbackInfo ci) {
+        Pose pose = ((EmotePoseHolder) state).saturnEmotes$getPose();
+        if (!pose.isEmpty()) {
+            PoseApplier.apply((HumanoidModel<?>) (Object) this, pose);
+        }
+    }
+}
diff --git a/src/main/java/org/saturnclient/emotes/fabric/mixin/LivingEntityRenderStateMixin.java b/src/main/java/org/saturnclient/emotes/fabric/mixin/LivingEntityRenderStateMixin.java
new file mode 100644
index 0000000..ef95a23
--- /dev/null
+++ b/src/main/java/org/saturnclient/emotes/fabric/mixin/LivingEntityRenderStateMixin.java
@@ -0,0 +1,24 @@
+package org.saturnclient.emotes.fabric.mixin;
+
+import org.saturnclient.emotes.core.Pose;
+import org.saturnclient.emotes.fabric.access.EmotePoseHolder;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+
+import net.minecraft.client.renderer.entity.state.LivingEntityRenderState;
+
+@Mixin(LivingEntityRenderState.class)
+public class LivingEntityRenderStateMixin implements EmotePoseHolder {
+    @Unique
+    private Pose saturnEmotes$pose = Pose.EMPTY;
+
+    @Override
+    public Pose saturnEmotes$getPose() {
+        return saturnEmotes$pose;
+    }
+
+    @Override
+    public void saturnEmotes$setPose(Pose pose) {
+        saturnEmotes$pose = pose;
+    }
+}
diff --git a/src/main/java/org/saturnclient/emotes/fabric/mixin/LivingEntityRendererMixin.java b/src/main/java/org/saturnclient/emotes/fabric/mixin/LivingEntityRendererMixin.java
new file mode 100644
index 0000000..36befc2
--- /dev/null
+++ b/src/main/java/org/saturnclient/emotes/fabric/mixin/LivingEntityRendererMixin.java
@@ -0,0 +1,27 @@
+package org.saturnclient.emotes.fabric.mixin;
+
+import org.saturnclient.emotes.core.Pose;
+import org.saturnclient.emotes.fabric.Emotes;
+import org.saturnclient.emotes.fabric.access.EmotePoseHolder;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import net.minecraft.client.renderer.entity.LivingEntityRenderer;
+import net.minecraft.client.renderer.entity.state.LivingEntityRenderState;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.player.Player;
+
+@Mixin(LivingEntityRenderer.class)
+public class LivingEntityRendererMixin {
+    @Inject(
+            method = "extractRenderState(Lnet/minecraft/world/entity/LivingEntity;Lnet/minecraft/client/renderer/entity/state/LivingEntityRenderState;F)V",
+            at = @At("TAIL"))
+    private void saturnEmotes$extractPose(LivingEntity entity, LivingEntityRenderState state, float partialTick,
+            CallbackInfo ci) {
+        // Render states are reused between entities, so always overwrite.
+        Pose pose = entity instanceof Player ? Emotes.sample(entity.getUUID(), partialTick) : Pose.EMPTY;
+        ((EmotePoseHolder) state).saturnEmotes$setPose(pose);
+    }
+}
diff --git a/src/main/resources/fabric.mod.json b/src/main/resources/fabric.mod.json
new file mode 100644
index 0000000..9851682
--- /dev/null
+++ b/src/main/resources/fabric.mod.json
@@ -0,0 +1,22 @@
+{
+  "schemaVersion": 1,
+  "id": "${id}",
+  "version": "${version}",
+  "name": "${name}",
+  "description": "Player emote library for Saturn Client, with limb bending.",
+  "authors": ["Saturn Client"],
+  "contact": {
+    "sources": "https://git.selimaj.dev/saturnclientmc/emotes"
+  },
+  "license": "Apache-2.0",
+  "environment": "client",
+  "entrypoints": {
+    "client": ["org.saturnclient.emotes.fabric.Emotes"]
+  },
+  "mixins": ["saturn_emotes.mixins.json"],
+  "depends": {
+    "fabricloader": ">=${loader}",
+    "minecraft": "${minecraft}",
+    "fabric-lifecycle-events-v1": "*"
+  }
+}
diff --git a/src/main/resources/saturn_emotes.mixins.json b/src/main/resources/saturn_emotes.mixins.json
new file mode 100644
index 0000000..75043d3
--- /dev/null
+++ b/src/main/resources/saturn_emotes.mixins.json
@@ -0,0 +1,13 @@
+{
+  "required": true,
+  "package": "org.saturnclient.emotes.fabric.mixin",
+  "compatibilityLevel": "${java}",
+  "client": [
+    "HumanoidModelMixin",
+    "LivingEntityRenderStateMixin",
+    "LivingEntityRendererMixin"
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}
diff --git a/src/testmod/java/org/saturnclient/emotes/testmod/EmotesTestmod.java b/src/testmod/java/org/saturnclient/emotes/testmod/EmotesTestmod.java
new file mode 100644
index 0000000..fa09878
--- /dev/null
+++ b/src/testmod/java/org/saturnclient/emotes/testmod/EmotesTestmod.java
@@ -0,0 +1,63 @@
+package org.saturnclient.emotes.testmod;
+
+import static net.fabricmc.fabric.api.client.command.v2.ClientCommandManager.argument;
+import static net.fabricmc.fabric.api.client.command.v2.ClientCommandManager.literal;
+
+import java.util.TreeSet;
+
+import org.saturnclient.emotes.core.Animation;
+import org.saturnclient.emotes.fabric.Emotes;
+import org.spongepowered.asm.mixin.MixinEnvironment;
+
+import com.mojang.brigadier.arguments.StringArgumentType;
+import com.mojang.brigadier.context.CommandContext;
+
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.command.v2.ClientCommandRegistrationCallback;
+import net.fabricmc.fabric.api.client.command.v2.FabricClientCommandSource;
+import net.minecraft.network.chat.Component;
+
+/**
+ * Dev-only tester. In game: {@code /emotes play <name>}, {@code /emotes stop}, {@code /emotes info}.
+ * Switch to third person (F5) to see yourself.
+ */
+public final class EmotesTestmod implements ClientModInitializer {
+    private static final String MINECRAFT = /*$ minecraft*/ "1.21.11";
+
+    @Override
+    public void onInitializeClient() {
+        // Applies every mixin now, so a broken target crashes at startup instead of in a world.
+        MixinEnvironment.getCurrentEnvironment().audit();
+        Emotes.LOGGER.info("Mixin audit passed on Minecraft {}", MINECRAFT);
+
+        ClientCommandRegistrationCallback.EVENT.register((dispatcher, registryAccess) -> dispatcher.register(
+                literal("emotes")
+                        .then(literal("play").then(argument("name", StringArgumentType.word())
+                                .suggests((ctx, builder) -> {
+                                    TestAnimations.ALL.keySet().forEach(builder::suggest);
+                                    return builder.buildFuture();
+                                })
+                                .executes(EmotesTestmod::play)))
+                        .then(literal("stop").executes(ctx -> {
+                            Emotes.stop(ctx.getSource().getPlayer().getUUID());
+                            return 1;
+                        }))
+                        .then(literal("info").executes(ctx -> {
+                            ctx.getSource().sendFeedback(Component.literal("Saturn Emotes " + Emotes.VERSION
+                                    + " on Minecraft " + MINECRAFT + ". Animations: "
+                                    + String.join(", ", new TreeSet<>(TestAnimations.ALL.keySet()))));
+                            return 1;
+                        }))));
+    }
+
+    private static int play(CommandContext<FabricClientCommandSource> ctx) {
+        String name = StringArgumentType.getString(ctx, "name");
+        Animation animation = TestAnimations.ALL.get(name);
+        if (animation == null) {
+            ctx.getSource().sendError(Component.literal("Unknown animation: " + name));
+            return 0;
+        }
+        Emotes.play(ctx.getSource().getPlayer().getUUID(), animation);
+        return 1;
+    }
+}
diff --git a/src/testmod/java/org/saturnclient/emotes/testmod/TestAnimations.java b/src/testmod/java/org/saturnclient/emotes/testmod/TestAnimations.java
new file mode 100644
index 0000000..b03464d
--- /dev/null
+++ b/src/testmod/java/org/saturnclient/emotes/testmod/TestAnimations.java
@@ -0,0 +1,66 @@
+package org.saturnclient.emotes.testmod;
+
+import java.util.Map;
+import java.util.function.Function;
+
+import org.saturnclient.emotes.core.Animation;
+import org.saturnclient.emotes.core.Bone;
+import org.saturnclient.emotes.core.BoneTransform;
+import org.saturnclient.emotes.core.Pose;
+
+/** Hand-written animations for checking that poses reach the model on every version. */
+final class TestAnimations {
+    private static final float HALF_PI = (float) (Math.PI / 2);
+
+    static final Map<String, Animation> ALL = Map.of(
+            // Right arm raised, waving side to side. Tests rotation.
+            "wave", of(40, true, t -> Pose.builder()
+                    .set(Bone.RIGHT_ARM, BoneTransform.rotation((float) Math.PI, 0,
+                            0.4f * (float) Math.sin(t * 0.4f)))
+                    .build()),
+            // Arms straight out, then back after 3 seconds. Tests non-looping end.
+            "tpose", of(60, false, t -> Pose.builder()
+                    .set(Bone.RIGHT_ARM, BoneTransform.rotation(0, 0, HALF_PI))
+                    .set(Bone.LEFT_ARM, BoneTransform.rotation(0, 0, -HALF_PI))
+                    .build()),
+            // Body bobbing down and up. Tests offsets.
+            "bob", of(20, true, t -> {
+                float drop = 2f * (1 - (float) Math.cos(t / 20f * 2 * Math.PI));
+                return Pose.builder()
+                        .set(Bone.HEAD, new BoneTransform(0, drop, 0, 0, 0, 0, 0, 0))
+                        .set(Bone.BODY, new BoneTransform(0, drop, 0, 0, 0, 0, 0, 0))
+                        .set(Bone.RIGHT_ARM, new BoneTransform(0, drop, 0, 0, 0, 0, 0, 0))
+                        .set(Bone.LEFT_ARM, new BoneTransform(0, drop, 0, 0, 0, 0, 0, 0))
+                        .build();
+            }),
+            // Arms forward with elbows folding in and out. Bend isn't rendered yet.
+            "bend", of(40, true, t -> {
+                float bend = HALF_PI * 0.5f * (1 - (float) Math.cos(t / 40f * 2 * Math.PI));
+                return Pose.builder()
+                        .set(Bone.RIGHT_ARM, BoneTransform.rotation(-HALF_PI, 0, 0).withBend(bend, 0))
+                        .set(Bone.LEFT_ARM, BoneTransform.rotation(-HALF_PI, 0, 0).withBend(bend, 0))
+                        .build();
+            }));
+
+    private TestAnimations() {
+    }
+
+    private static Animation of(float length, boolean loops, Function<Float, Pose> sampler) {
+        return new Animation() {
+            @Override
+            public Pose sample(float tick) {
+                return sampler.apply(tick);
+            }
+
+            @Override
+            public float length() {
+                return length;
+            }
+
+            @Override
+            public boolean loops() {
+                return loops;
+            }
+        };
+    }
+}
diff --git a/src/testmod/resources/fabric.mod.json b/src/testmod/resources/fabric.mod.json
new file mode 100644
index 0000000..17f19a8
--- /dev/null
+++ b/src/testmod/resources/fabric.mod.json
@@ -0,0 +1,16 @@
+{
+  "schemaVersion": 1,
+  "id": "saturn_emotes_testmod",
+  "version": "${version}",
+  "name": "Saturn Emotes Tester",
+  "description": "Dev-only commands for trying Saturn Emotes in game.",
+  "license": "Apache-2.0",
+  "environment": "client",
+  "entrypoints": {
+    "client": ["org.saturnclient.emotes.testmod.EmotesTestmod"]
+  },
+  "depends": {
+    "saturn_emotes": "*",
+    "fabric-command-api-v2": "*"
+  }
+}
diff --git a/stonecutter.gradle.kts b/stonecutter.gradle.kts
new file mode 100644
index 0000000..be1d6e5
--- /dev/null
+++ b/stonecutter.gradle.kts
@@ -0,0 +1,23 @@
+plugins {
+    id("dev.kikugie.stonecutter")
+}
+
+stonecutter active "1.21.11"
+
+// See https://stonecutter.kikugie.dev/wiki/config/params
+stonecutter parameters {
+    swaps["mod_version"] = "\"${property("mod.version")}\";"
+    swaps["minecraft"] = "\"${node.metadata.version}\";"
+
+    replacements {
+        string(current.parsed >= "1.21.11") {
+            replace("ResourceLocation", "Identifier")
+        }
+    }
+}
+
+// Builds and collects every version's jar into build/libs/<mod version>/.
+tasks.register("buildAll") {
+    group = "build"
+    dependsOn(stonecutter.tasks.named("buildAndCollect"))
+}
diff --git a/stonecutter.properties.toml b/stonecutter.properties.toml
new file mode 100644
index 0000000..1dc699e
--- /dev/null
+++ b/stonecutter.properties.toml
@@ -0,0 +1,40 @@
+# See https://stonecutter.kikugie.dev/wiki/config/properties#centralized-properties
+mod.id = "saturn_emotes"
+mod.name = "Saturn Emotes"
+mod.group = "org.saturnclient"
+mod.version = "0.1.0"
+
+deps.fabric_loader = "0.19.5"
+loomx.loom_version = "1.17.21"
+
+["1.21.4"]
+mod.mc_compat = "1.21.4"
+deps.fabric_api = "0.119.4+1.21.4"
+
+["1.21.5"]
+mod.mc_compat = "1.21.5"
+deps.fabric_api = "0.128.2+1.21.5"
+
+["1.21.6"]
+mod.mc_compat = "1.21.6"
+deps.fabric_api = "0.128.2+1.21.6"
+
+["1.21.7"]
+mod.mc_compat = "1.21.7"
+deps.fabric_api = "0.129.0+1.21.7"
+
+["1.21.8"]
+mod.mc_compat = "1.21.8"
+deps.fabric_api = "0.136.1+1.21.8"
+
+["1.21.9"]
+mod.mc_compat = "1.21.9"
+deps.fabric_api = "0.134.1+1.21.9"
+
+["1.21.10"]
+mod.mc_compat = "1.21.10"
+deps.fabric_api = "0.138.4+1.21.10"
+
+["1.21.11"]
+mod.mc_compat = "1.21.11"
+deps.fabric_api = "0.141.6+1.21.11"