---
title: "Unavailable"
description: "Something Auto relies on can't serve this request right now, such as a model, a tool server or the runtime's own records."
url: "https://on.auto/problems/unavailable"
last_updated: "2026-11-10T14:41:54+00:00"
---

# Unavailable

## What it means

Something Auto relies on can't serve this request right now, such as a model, a tool server or the runtime's own records. Some causes pass on their own, and some need a change first, such as naming a model the server offers.

## What to do

Read the problem's `detail` first. It says what happened to this request.

*   If the response has a `Retry-After` header, wait that many seconds and send the request again.
*   Without `Retry-After`, sending the same request won't help until something changes. The `kind` and `detail` say what. For example, `model_not_offered` means the server doesn't offer the model a function names, and `tool_not_offered` a tool it names.
*   `list_models` shows the models the server offers, and `search` the tools a function may use.
*   If it keeps happening, tell whoever runs the server.

## Technical details

*   Type: `https://on.auto/problems/unavailable`
*   Status: 503
*   Reason: `unavailable`
*   `kind`: what couldn't be used, such as `model_not_offered`, `tool_not_offered` or `tool_server_failed`
*   `because`: more about the cause, such as `provider_not_configured`; `stalled` means waiting won't help
*   `Retry-After` header: the seconds to wait before trying again, sent only when trying again may work

[Responses and errors](https://on.auto/docs/reference/http#responses-and-errors) in the HTTP API reference has the full detail. [Problem types](https://on.auto/problems/) lists every type.

## Sitemap

See the [full documentation and product sitemap](https://on.auto/sitemap.md) for related pages.