Struct HarnessCapabilities 

pub struct HarnessCapabilities {
    pub credential_required: bool,
    pub previews_edits: bool,
    pub models: Vec<HarnessModel>,
    pub allows_custom_model: bool,
    pub supports_effort: bool,
    pub supports_max_turns: bool,
    pub supports_login: bool,
}

What a harness supports, so every consumer (the picker, the options panel, the credential preflight, the chat availability gate) adapts to it declaratively instead of branching on the harness id. A new adapter that, say, needs a stored key just sets credential_required: true here — no id == "bob" checks to hunt down.

Fields

credential_required: bool

Compose stores this harness’s credential (bob). When false, the CLI owns its own login (claude/codex) and Compose runs no credential/install preflight — a missing login surfaces as the harness’s own run error rather than a Compose prompt.

previews_edits: bool

Emits previewable suggested edits the user approves before they apply (bob). When false, edits land on disk directly and the file watcher reflects them (claude/codex).

models: Vec<HarnessModel>

Curated model choices for the picker’s selector. Empty → no curated list (rely on allows_custom_model).

allows_custom_model: bool

Whether a free-text model id is accepted beyond models (codex, whose model names change frequently). Drives a text field vs a fixed dropdown in the picker.

supports_effort: bool

Honors RunTuning::effort (codex reasoning effort).

supports_max_turns: bool

Honors RunTuning::max_turns (claude turn cap).

supports_login: bool

Supports an interactive Harness::login flow (the CLI’s own OAuth, e.g. claude auth login / codex login). Drives the picker’s “Sign in” affordance when installed-but-not-signed-in. false for harnesses Compose authenticates itself (bob).

Trait Implementations

impl Clone for HarnessCapabilities

fn clone(&self) -> HarnessCapabilities

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HarnessCapabilities

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Serialize for HarnessCapabilities

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.