> ## Documentation Index
> Fetch the complete documentation index at: https://help.skillsdb.com/llms.txt
> Use this file to discover all available pages before exploring further.

# validation-error

> 400 — the request itself is malformed

<Info>
  **Quick Summary:** The request could not be accepted as written — a parameter is out of range, a field is unknown, or a value has the wrong shape. Fix the request; retrying unchanged will fail again.
</Info>

## What happened

The API rejected the request before doing any work. The `errors` array names each offending field with a machine-readable `code`.

## Likely causes

* `limit` above 200 or `offset` above 10,000 — the API **rejects** these rather than silently clamping.
* A filter or sort field that is not on the endpoint whitelist (`not_filterable` / `not_sortable`).
* An unknown body or query member — including any attempt to pass `companyId`; tenancy always comes from your key.
* A malformed id (`invalid_id`), or an `Idempotency-Key` header over 200 characters.

## What to do

Read the `errors` array, fix each named field, and resend. Do not build retry loops around 400s — the same request always produces the same 400.