# Show HN: Posecode, a text language and renderer for human movement

> Source: <https://www.posecode.org/play>
> Published: 2026-07-21 19:29:11+00:00

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1
**Copy the prompt.** Click *Copy LLM prompt* (top right). It teaches
a capable model how to write the Posecode language.

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2
**Ask an LLM for a movement.** Paste the prompt, then ask for what you want:
*“write a deadlift”*, *“a hamstring stretch”*, *“cat-cow”*.
For a representable request, it should reply with only the raw
`.posecode`

document.

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3
**Paste it here.** Drop the raw `.posecode`

text into the editor on
the left. Valid documents animate; parse errors, range clamps, and unresolved
reach targets appear below the editor.

### Authoring reference

The [language specification](/spec.html) is the normative
Posecode contract. The [LLM guide](/llm-guide.html) is a
self-contained authoring aid built from that contract.

`ground-lock`

preserves an existing floor support;
`reach`

moves a limb; `pin`

moves the whole body
around one anchor; and `grip`

solves hands onto a bar or
rails. A `cue`

is display-only coaching text and never
changes the animation.

The prompt you’ll paste into the LLM