Native Operation Interceptors in Aether Kotlin Mods

Native interceptors integrate into the same operation chain as Script interceptors but always run first. They can observe, modify, cancel, or replace operation payloads before any Script-level handler sees them.

API

Call context.intercept() inside onLoad:

context.intercept(
    operation: String,
    priority: Int,
    interceptor: AetherModOperationInterceptor
)

AetherModOperationInterceptor is a fun interface with one method:

suspend fun intercept(
    payload: JSONObject,
    context: JSONObject,
): AetherModOperationDecision

Parameter	Description
`operation`	The operation name to intercept, or `"*"` to intercept every operation.
`priority`	Higher-priority interceptors run first within the Native interceptor tier.
`interceptor`	`AetherModOperationInterceptor` receiving the current `payload` and an operation `context` object; returns an `AetherModOperationDecision`.

Decision types

Your handler must return an AetherModOperationDecision that tells the chain what to do:

Decision	Effect
`AetherModOperationDecision(payload = ...)`	Pass the operation through with a modified payload.
`AetherModOperationDecision(cancelled = true, reason = "...")`	Cancel the operation. No further interceptors or built-in handlers run.
`AetherModOperationDecision(payload = payload)`	Pass through with the payload unchanged.

You can also use the context.cancelOperation() extension function as a shorthand:

return context.cancelOperation(payload, reason = "Blocked by MyNativeMod")

Built-in operations

Operation	Triggered by
`chat.new`	A new chat turn starting.
`skills.selection`	The user or an extension changing the active skill selection.

Use "*" to intercept every operation dispatched through the kernel — useful for diagnostics, logging, or blanket policy enforcement.

Example — modifying chat.new

Clear the selected skill IDs before every new chat turn:

context.intercept("chat.new", priority = 500) { payload, _ ->
    AetherModOperationDecision(
        payload = payload.put("selected_skill_ids", JSONArray()),
    )
}

Example — wildcard observer

Log every operation without modifying it:

context.intercept("*", priority = 100) { payload, _ ->
    Log.d("MyMod", "Operation: ${payload}")
    AetherModOperationDecision(payload = payload) // pass through unchanged
}

Example — cancelling an operation

Prevent a specific skill from being deselected:

context.intercept("skills.selection", priority = 500) { payload, _ ->
    val skillId = payload.optString("skill_id")
    val selected = payload.optBoolean("selected", true)
    if (skillId == "locked-skill" && !selected) {
        AetherModOperationDecision(
            cancelled = true,
            reason = "This skill is locked by MyNativeMod.",
        )
    } else {
        null
    }
}

Native interceptors run before Script interceptors for the same operation and priority. Within the Native tier, interceptors are ordered by their priority value — higher values run first.

​API

​Decision types

​Built-in operations

​Example — modifying chat.new

​Example — wildcard observer

​Example — cancelling an operation

API

Decision types

Built-in operations

Example — modifying chat.new

Example — wildcard observer

Example — cancelling an operation