From d64ab076f2ccf37aee99a6b43d5d52b36f9324c3 Mon Sep 17 00:00:00 2001
From: Cloudyan <cloudyan@outlook.com>
Date: Mon, 2 Feb 2026 21:33:04 +0800
Subject: [PATCH] fix: provider headers from config not applied to fetch
 requests

When configuring custom headers (including User-Agent) for a provider or model
in opencode.jsonc, the headers are not actually sent with the API requests.

For example, this configuration does not work:

```json
    {
      "provider": {
        "myprovider": {
          "models": {
            "my-model": {
              "headers": {
                "User-Agent": "MyCustomAgent/1.0"
              }
            }
          }
        }
      }
    }
```

In packages/opencode/src/provider/provider.ts, the getSDK function correctly
merges model.headers into options["headers"]:

```ts
if (model.headers)
      options["headers"] = {
        ...options["headers"],
        ...model.headers,
      }
```

However, in the custom fetch function, opts.headers comes from the init
parameter passed by the AI SDK, not from options["headers"]. This means the
configured headers are never actually included in the request.


Solution

Update the custom fetch function to merge options["headers"] into opts.headers:

```ts
        opts.headers = {
          ...(typeof opts.headers === 'object' ? opts.headers : {}),
          ...options["headers"],
        };
```
---
 packages/opencode/src/provider/provider.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/opencode/src/provider/provider.ts b/packages/opencode/src/provider/provider.ts
index e01c583ff348..57a58ba8cf22 100644
--- a/packages/opencode/src/provider/provider.ts
+++ b/packages/opencode/src/provider/provider.ts
@@ -992,6 +992,12 @@ export namespace Provider {
         const fetchFn = customFetch ?? fetch
         const opts = init ?? {}
 
+        // Merge configured headers into request headers
+        opts.headers = {
+          ...(typeof opts.headers === 'object' ? opts.headers : {}),
+          ...options["headers"],
+        }
+
         if (options["timeout"] !== undefined && options["timeout"] !== null) {
           const signals: AbortSignal[] = []
           if (opts.signal) signals.push(opts.signal)