# Spell metadata kwargs

**🟡 Intermediate · Lesson 06**

Spell metadata via bind kwargs (landed 2026-07-19): any extra keyword on bind() threads into the Spell's own kwargs channel and lands on spell.metadata - tag your registrations with ownership, tiers, or agent breadcrumbs. Native bind values are unstealable: declared parameters capture their names before **kwargs collects.

## Before you run

Use the [Intermediate guide](../../intermediate/index.md) for prerequisite concepts. Run from a checkout with Melder installed and Python 3.14 free-threading selected. The collection download includes the level's local helper modules.

## Run the saved script

```bash
python UX_and_AIX_experiences/02_intermediate/06_spell_metadata_kwargs.py
```

```powershell
py -3.14t UX_and_AIX_experiences/02_intermediate/06_spell_metadata_kwargs.py
```

{download}`Download this collection <../../downloads/intermediate-examples.zip>` · [Source on GitHub](https://github.com/Synaptic724/melder/blob/0895ce795453cd87e35d70665957b4e89aad3317/UX_and_AIX_experiences/02_intermediate/06_spell_metadata_kwargs.py)

## Public surface

bind(**extras) -> Spell.metadata, find_spell_by_spell_id

## Code

```{literalinclude} ../../downloads/02_intermediate/06_spell_metadata_kwargs.py
:language: python
:linenos:
```

## Check the outcome

The script contains its own assertions or demonstrated refusal paths. Run it to evaluate those checks against your installed version. The code above is taken directly from the saved file; no run output is invented here.

[More intermediate examples](index.md) · [Level guide](../../intermediate/index.md)

## Related guides

- [Fluent registration](../../intermediate/registration.md)

## API contracts

- [Spell](../../reference/api/binding/spell.md)