Allow passing custom provider options to opencode run

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

@@ -78,6 +78,11 @@ export const RunCommand = cmd({
         array: true,
         describe: "file(s) to attach to message",
       })
+      .option("provider-options", {
+        type: "string",
+        describe:
+          'JSON object with provider-specific options, passed to the AI SDK. Example: \'{"reasoningEffort": "high"}\'. See https://ai-sdk.dev/providers',
+      })
   },
   handler: async (args) => {
     let message = args.message.join(" ")
@@ -118,6 +123,26 @@ export const RunCommand = cmd({
       process.exit(1)
     }
 
+    // Parse and validate custom options
+    let customProviderOptions: Record<string, unknown> | undefined
+    if (args.providerOptions) {
+      try {
+        customProviderOptions = JSON.parse(args.providerOptions)
+        if (
+          typeof customProviderOptions !== "object" ||
+          customProviderOptions === null ||
+          Array.isArray(customProviderOptions)
+        ) {
+          UI.error("--provider-options must be a JSON object")
+          process.exit(1)
+        }
+      } catch (error) {
+        const msg = error instanceof Error ? error.message : String(error)
+        UI.error(`Invalid JSON in --provider-options: ${msg}`)
+        process.exit(1)
+      }
+    }
+
     await bootstrap(process.cwd(), async () => {
       if (args.command) {
         const exists = await Command.get(args.command)
@@ -268,6 +293,7 @@ export const RunCommand = cmd({
             model: providerID + "/" + modelID,
             command: args.command,
             arguments: message,
+            providerOptions: customProviderOptions,
           })
         }
         return await SessionPrompt.prompt({
@@ -286,6 +312,7 @@ export const RunCommand = cmd({
               text: message,
             },
           ],
+          providerOptions: customProviderOptions,
         })
       })()
       if (errorMsg) process.exit(1)

packages/opencode/src/session/prompt.ts

@@ -97,6 +97,7 @@ export namespace SessionPrompt {
     noReply: z.boolean().optional(),
     system: z.string().optional(),
     tools: z.record(z.string(), z.boolean()).optional(),
+    providerOptions: z.record(z.string(), z.unknown()).optional(),
     parts: z.array(
       z.discriminatedUnion("type", [
         MessageV2.TextPart.omit({
@@ -158,6 +159,7 @@ export namespace SessionPrompt {
         state().queued.set(input.sessionID, queue)
       })
     }
+
     const agent = await Agent.get(input.agent ?? "build")
     const model = await resolveModel({
       agent,
@@ -207,6 +209,7 @@ export namespace SessionPrompt {
           ...ProviderTransform.options(model.providerID, model.modelID, input.sessionID),
           ...model.info.options,
           ...agent.options,
+          ...input.providerOptions,
         },
       },
     )
@@ -1467,6 +1470,7 @@ export namespace SessionPrompt {
     model: z.string().optional(),
     arguments: z.string(),
     command: z.string(),
+    providerOptions: z.record(z.string(), z.unknown()).optional(),
   })
   export type CommandInput = z.infer<typeof CommandInput>
   const bashRegex = /!`([^`]+)`/g
@@ -1679,6 +1683,7 @@ export namespace SessionPrompt {
       model,
       agent: agentName,
       parts,
+      providerOptions: input.providerOptions,
     })
   }