feat: model option for generating agent

STATS.md

@@ -46,3 +46,12 @@
 | 2025-08-10 | 165,695 (+2,925) | 167,109 (+1,388) | 332,804 (+4,313)  |
 | 2025-08-11 | 169,297 (+3,602) | 167,953 (+844)   | 337,250 (+4,446)  |
 | 2025-08-12 | 176,307 (+7,010) | 171,876 (+3,923) | 348,183 (+10,933) |
+| 2025-08-13 | 183,208 (+6,901) | 177,182 (+5,306) | 360,390 (+12,207) |
+| 2025-08-14 | 189,245 (+6,037) | 179,741 (+2,559) | 368,986 (+8,596)  |
+| 2025-08-15 | 193,759 (+4,514) | 181,792 (+2,051) | 375,551 (+6,565)  |
+| 2025-08-16 | 198,221 (+4,462) | 184,558 (+2,766) | 382,779 (+7,228)  |
+| 2025-08-17 | 201,390 (+3,169) | 186,269 (+1,711) | 387,659 (+4,880)  |
+| 2025-08-18 | 204,702 (+3,312) | 187,399 (+1,130) | 392,101 (+4,442)  |
+| 2025-08-19 | 209,999 (+5,297) | 189,668 (+2,269) | 399,667 (+7,566)  |
+| 2025-08-20 | 214,727 (+4,728) | 191,481 (+1,813) | 406,208 (+6,541)  |
+| 2025-08-21 | 220,675 (+5,948) | 194,784 (+3,303) | 415,459 (+9,251)  |

packages/opencode/src/agent/agent.ts

@@ -140,8 +140,8 @@ export namespace Agent {
     return state().then((x) => Object.values(x))
   }
 
-  export async function generate(input: { description: string }) {
-    const defaultModel = await Provider.defaultModel()
+  export async function generate(input: { description: string; model?: { providerID: string; modelID: string } }) {
+    const defaultModel = input.model ?? (await Provider.defaultModel())
     const model = await Provider.getModel(defaultModel.providerID, defaultModel.modelID)
     const system = SystemPrompt.header(defaultModel.providerID)
     system.push(PROMPT_GENERATE)

packages/opencode/src/cli/cmd/agent.ts

@@ -3,14 +3,22 @@ import * as prompts from "@clack/prompts"
 import { UI } from "../ui"
 import { Global } from "../../global"
 import { Agent } from "../../agent/agent"
+import { Provider } from "../../provider/provider"
 import path from "path"
 import matter from "gray-matter"
 import { App } from "../../app/app"
 
 const AgentCreateCommand = cmd({
   command: "create",
   describe: "create a new agent",
-  async handler() {
+  builder: (yargs) => {
+    return yargs.option("model", {
+      type: "string",
+      alias: ["m"],
+      describe: "model to use in the format of provider/model",
+    })
+  },
+  async handler(args) {
     await App.provide({ cwd: process.cwd() }, async (app) => {
       UI.empty()
       prompts.intro("Create agent")
@@ -43,10 +51,33 @@ const AgentCreateCommand = cmd({
       })
       if (prompts.isCancel(query)) throw new UI.CancelledError()
 
+      let modelConfig: { providerID: string; modelID: string } | undefined
+      if (args.model) {
+        try {
+          const parsed = Provider.parseModel(args.model)
+          const provider = await Provider.getProvider(parsed.providerID)
+          if (!provider) {
+            throw new Error(`Provider '${parsed.providerID}' not found`)
+          }
+          await Provider.getModel(parsed.providerID, parsed.modelID)
+          modelConfig = parsed
+        } catch (error) {
+          prompts.log.error(`Invalid model: ${args.model}`)
+          prompts.log.error(error instanceof Error ? error.message : String(error))
+          throw new UI.CancelledError()
+        }
+      }
+
       const spinner = prompts.spinner()
 
-      spinner.start("Generating agent configuration...")
-      const generated = await Agent.generate({ description: query })
+      const spinnerMessage = modelConfig
+        ? `Generating agent configuration using ${modelConfig.providerID}/${modelConfig.modelID}...`
+        : "Generating agent configuration..."
+      spinner.start(spinnerMessage)
+      const generated = await Agent.generate({
+        description: query,
+        model: modelConfig,
+      })
       spinner.stop(`Agent ${generated.identifier} generated`)
 
       const availableTools = [