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For complex parts like a tail swaying in the wind, you definitely don't need to keyframe every bone. The solution is to let Blender's physics and procedural systems do the heavy lifting for you.

There are two main approaches to automating this: physics-based jiggle and secondary motion, and procedural wind and wave systems.

🌬️ Approach 1: Physics-Based Jiggle & Secondary Motion

This is your best bet for a tail. Instead of animating it directly, you animate the character's main body, and the tail reacts automatically with realistic physics—swaying, bouncing, and dragging behind.

Several Blender add-ons excel at this:

• Pegaso Springify: A very powerful tool that adds spring physics to bones in real-time, creating natural jiggle and follow-through for tails, hair, and clothing . It features an interactive mode to test physics live and supports collision with mesh or bone colliders to prevent clipping (e.g., a tail going through a leg) .
• Wiggle 2: A complete rewrite of the popular Wiggle Bones add-on, applying spring physics to bone heads and tails. It offers dual-ended physics control, mesh collision, and allows for physics chains for more complex setups .
• Wobbly Wiggler: This add-on is unique because it can add jiggle directly on top of actively animated bones, meaning your manually animated movements and the automated physics can blend seamlessly .

💨 Approach 2: Procedural Wind & Wave Systems

For a tail that's blown by the wind, you might want more of a procedural wave effect. These tools automate movement based on noise and directional forces.

• Breeze Animation: This add-on is purpose-built for creating wind effects with just one click. It can automatically generate a bone chain for an object, auto-weight paint it, and apply noise-driven wind controls for swaying . This seems perfect for a tail swaying in a breeze .
• Slither: While designed for snakes and tentacles, this free add-on uses a sine wave to automate a slithering motion along a bone chain. It could be adapted for a tail that needs a specific, rhythmic wave motion rather than random physics .

🌪️ What to Look For in a Solution

• Collision: To make the movement believable, the tail needs to interact with the body. Look for tools with collision systems so the tail doesn't clip through the character's legs or back .
• Baking: For final rendering or exporting to a game engine, you'll need to bake the simulation into standard keyframes. Most of these tools offer this feature .
• Stylized Control: Some tools, like Goo Physics, specifically focus on stylized animation, allowing you to tweak the simulation to get appealing, exaggerated arcs rather than just realistic physics .

📝 My Recommendation

Given your specific need for a tail and wind, here is a suggested workflow: