fix(opencode): preserve Cerebras completion limit (#43736)

Co-authored-by: Aiden <rekram1-node@users.noreply.github.com>
Co-authored-by: ryanl-cerebras <230249923+ryanl-cerebras@users.noreply.github.com>

packages/opencode/src/plugin/cerebras.ts

@@ -0,0 +1,11 @@
+import type { Hooks, PluginInput } from "@opencode-ai/plugin"
+
+export async function CerebrasPlugin(_input: PluginInput): Promise<Hooks> {
+  return {
+    "chat.params": async (input, output) => {
+      if (input.model.api.npm !== "@ai-sdk/cerebras") return
+      if (output.options.max_completion_tokens === undefined) return
+      output.maxOutputTokens = undefined
+    },
+  }
+}

packages/opencode/src/plugin/index.ts

@@ -20,6 +20,7 @@ import { CloudflareAIGatewayAuthPlugin, CloudflareWorkersAuthPlugin } from "./cl
 import { AzureAuthPlugin } from "./azure"
 import { DigitalOceanAuthPlugin } from "./digitalocean"
 import { XaiAuthPlugin } from "./xai"
+import { CerebrasPlugin } from "./cerebras"
 import { SnowflakeCortexAuthPlugin } from "./snowflake-cortex"
 import { Effect, Layer, Context } from "effect"
 import { EffectBridge } from "@/effect/bridge"
@@ -80,6 +81,7 @@ function internalPlugins(flags: RuntimeFlags.Info): PluginInstance[] {
     DigitalOceanAuthPlugin,
     SnowflakeCortexAuthPlugin,
     XaiAuthPlugin,
+    CerebrasPlugin,
   ]
 }