Show HN: Compile-time model-id validation with declared capability

Compile-time checked OpenRouter model ids.

model_supports!

validates a model id and its required capabilities against a vendored OpenRouter index, then expands to the model id string.

use openrouter_toolkit::model_supports;

const MODEL: &str = model_supports!(
    "openai/gpt-5.4",
    param::tools,
    input::image,
    output::text,
);

Dynamic variants work too:

const MODEL: &str = model_supports!("moonshotai/kimi-k2-0905:exacto", param::tools);

param::*

— request parameters (e.g.param::tools

)input::*

— input modalities (e.g.input::image

)output::*

— output modalities (e.g.output::text

)

Unknown capability:

const MODEL: &str = model_supports!("qwen/qwen3.7-max", param::toolz);
error: unknown OpenRouter capability `param::toolz`; did you mean `param::tools`?

Capability not supported by the model:

const MODEL: &str = model_supports!("qwen/qwen3.7-max", input::image);
error: OpenRouter model `qwen/qwen3.7-max` does not support required capability(s): input::image