# BLOCK_SCHEMA_DERIVATION_FAILED

The block document schema could not be derived, because something in the process extended `Object.prototype`.

## Cause

The block document schema could not be derived, because something in the process extended `Object.prototype`.

The block document schema is derived from Nextly's own definition of the format. When something in the process has added properties to `Object.prototype`, the derivation loses the block node's fields, and Nextly refuses to emit a schema that would accept malformed documents.

## Fix

* Find the code that adds properties to `Object.prototype`, often a dependency, and remove or update it.
* `--verbose` shows the stack where the schema was derived.

## Example

```text
✗ The block document schema could not be derived, so it was not emitted.
  Why:  Object.prototype has been extended; zod's registry reads `id` off the object given to .meta(), so the emitted schema loses the node's fields and would describe a format that accepts malformed nodes.
  Next: Find the code that adds properties to `Object.prototype`, often a dependency, and remove it; `--verbose` shows where the schema was derived.
  Docs: https://nextlyhq.com/docs/cli/errors/block-schema-derivation-failed  (BLOCK_SCHEMA_DERIVATION_FAILED)
```