feat: add variants toggle (#6325)

Co-authored-by: Github Action <action@github.com>

packages/opencode/src/session/llm.ts

@@ -74,6 +74,14 @@ export namespace LLM {
     }
 
     const provider = await Provider.getProvider(input.model.providerID)
+    const variant = input.model.variants && input.user.variant ? input.model.variants[input.user.variant] : undefined
+    const options = pipe(
+      ProviderTransform.options(input.model, input.sessionID, provider.options),
+      mergeDeep(input.small ? ProviderTransform.smallOptions(input.model) : {}),
+      mergeDeep(input.model.options),
+      mergeDeep(input.agent.options),
+      mergeDeep(variant && !variant.disabled ? variant : {}),
+    )
 
     const params = await Plugin.trigger(
       "chat.params",
@@ -90,13 +98,7 @@ export namespace LLM {
           : undefined,
         topP: input.agent.topP ?? ProviderTransform.topP(input.model),
         topK: ProviderTransform.topK(input.model),
-        options: pipe(
-          {},
-          mergeDeep(ProviderTransform.options(input.model, input.sessionID, provider.options)),
-          input.small ? mergeDeep(ProviderTransform.smallOptions(input.model)) : mergeDeep({}),
-          mergeDeep(input.model.options),
-          mergeDeep(input.agent.options),
-        ),
+        options,
       },
     )
 

packages/opencode/src/session/message-v2.ts

@@ -1,8 +1,6 @@
 import { BusEvent } from "@/bus/bus-event"
-import { Bus } from "@/bus"
 import z from "zod"
 import { NamedError } from "@opencode-ai/util/error"
-import { Message } from "./message"
 import { APICallError, convertToModelMessages, LoadAPIKeyError, type ModelMessage, type UIMessage } from "ai"
 import { Identifier } from "../id/id"
 import { LSP } from "../lsp"
@@ -308,6 +306,7 @@ export namespace MessageV2 {
     }),
     system: z.string().optional(),
     tools: z.record(z.string(), z.boolean()).optional(),
+    variant: z.string().optional(),
   }).meta({
     ref: "UserMessage",
   })

packages/opencode/src/session/prompt.ts

@@ -90,6 +90,7 @@ export namespace SessionPrompt {
     noReply: z.boolean().optional(),
     tools: z.record(z.string(), z.boolean()).optional(),
     system: z.string().optional(),
+    variant: z.string().optional(),
     parts: z.array(
       z.discriminatedUnion("type", [
         MessageV2.TextPart.omit({
@@ -727,6 +728,7 @@ export namespace SessionPrompt {
       agent: agent.name,
       model: input.model ?? agent.model ?? (await lastModel(input.sessionID)),
       system: input.system,
+      variant: input.variant,
     }
 
     const parts = await Promise.all(
@@ -1267,6 +1269,7 @@ export namespace SessionPrompt {
     model: z.string().optional(),
     arguments: z.string(),
     command: z.string(),
+    variant: z.string().optional(),
   })
   export type CommandInput = z.infer<typeof CommandInput>
   const bashRegex = /!`([^`]+)`/g
@@ -1369,6 +1372,7 @@ export namespace SessionPrompt {
       model,
       agent: agentName,
       parts,
+      variant: input.variant,
     })) as MessageV2.WithParts
 
     Bus.publish(Command.Event.Executed, {