# deviceBackendCapability

A device backend capability record carrying backend, family, runtimeReady, placementSupported, mixedExecutionSupported, and related state.

Last updated: 2026-09-09

Package: compute.device | Status: source-declared

Tags: compute, compute.device, cpu, device, method, source-example, thing, yeho

Inspect device capability catalogs and model resource lifetimes and placement decisions.

```yh
external thing deviceBackendCapability
```

- text backend: Stores backend as text.
- text family: Stores family as text.
- bool runtimeReady: Stores runtime ready as bool.
- bool placementSupported: Stores placement supported as bool.
- bool mixedExecutionSupported: Stores mixed execution supported as bool.
- text fallbackBackend: Stores fallback backend as text.
- text status: Stores status as text.
- text notes: Stores notes as text.
- deviceBackendCapability(text backend, text family, bool runtimeReady, bool placementSupported, bool mixedExecutionSupported, text fallbackBackend, text status, text notes): Device backend capability.
- IsReady() returns bool: Is ready.
- HasFallback() returns bool: Has fallback.
- Describe() returns text: Describe.

## Use deviceBackendCapability

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using compute.device

// Inspect device capability catalogs and model resource lifetimes and placement decisions.
deviceBackendCapability sample = deviceBackendCapability("cpu-oracle", "cpu", true, true, true, "fallback Backend", "ready", "notes")
Console.Log(Text.From(sample.backend))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_device__devicebackendcapability"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

[[dependencies]]
package = "compute.device"
version = "0.1.0"
path = "../../../yeho/packages/compute/device"

[[dependencies]]
package = "compute.tensor"
version = "0.1.0"
path = "../../../yeho/packages/compute/tensor"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.device--deviceBackendCapability/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## deviceBackendCapability.IsReady

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using compute.device

// Is ready.
deviceBackendCapability instance = deviceBackendCapability("cpu-oracle", "cpu", true, true, true, "fallback Backend", "ready", "notes")
bool result = instance.IsReady()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_device__devicebackendcapability"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

[[dependencies]]
package = "compute.device"
version = "0.1.0"
path = "../../../yeho/packages/compute/device"

[[dependencies]]
package = "compute.tensor"
version = "0.1.0"
path = "../../../yeho/packages/compute/tensor"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.device--deviceBackendCapability/method-IsReady-9 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## deviceBackendCapability.HasFallback

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using compute.device

// Has fallback.
deviceBackendCapability instance = deviceBackendCapability("cpu-oracle", "cpu", true, true, true, "fallback Backend", "ready", "notes")
bool result = instance.HasFallback()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_device__devicebackendcapability"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

[[dependencies]]
package = "compute.device"
version = "0.1.0"
path = "../../../yeho/packages/compute/device"

[[dependencies]]
package = "compute.tensor"
version = "0.1.0"
path = "../../../yeho/packages/compute/tensor"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.device--deviceBackendCapability/method-HasFallback-10 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## deviceBackendCapability.Describe

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using compute.device

// Describe.
deviceBackendCapability instance = deviceBackendCapability("cpu-oracle", "cpu", true, true, true, "fallback Backend", "ready", "notes")
text result = instance.Describe()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.compute_device__devicebackendcapability"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "compute.buffer"
version = "0.1.0"
path = "../../../yeho/packages/compute/buffer"

[[dependencies]]
package = "compute.device"
version = "0.1.0"
path = "../../../yeho/packages/compute/device"

[[dependencies]]
package = "compute.tensor"
version = "0.1.0"
path = "../../../yeho/packages/compute/tensor"

[[dependencies]]
package = "console"
version = "0.1.0"
path = "../../../yeho/packages/console"

[[dependencies]]
package = "diagnostics"
version = "0.1.0"
path = "../../../yeho/packages/diagnostics"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/compute.device--deviceBackendCapability/method-Describe-11 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: yeho/packages/compute/device/device.yh

AI training permission: https://demonhunterlabs.com/ai-use