From 945aa51b9be4c6c072a08470b38410419e1da493 Mon Sep 17 00:00:00 2001
From: Ronny Hanssen <super.ronny@gmail.com>
Date: Thu, 19 Mar 2026 15:01:05 +0100
Subject: [PATCH] fix(ai-ollama): forward systemPrompts to Ollama API

The `mapCommonOptionsToOllama()` method was silently dropping the `systemPrompts` field from chat options. System prompts passed via `chat({ systemPrompts: [...] })` now correctly reach the Ollama API as the `system` parameter on the chat request. This is how other adapters (e.g. Anthropic) handle it.
---
 packages/typescript/ai-ollama/src/adapters/text.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/typescript/ai-ollama/src/adapters/text.ts b/packages/typescript/ai-ollama/src/adapters/text.ts
index e96bd52e1..2067ab2a3 100644
--- a/packages/typescript/ai-ollama/src/adapters/text.ts
+++ b/packages/typescript/ai-ollama/src/adapters/text.ts
@@ -452,6 +452,9 @@ export class OllamaTextAdapter<TModel extends string> extends BaseTextAdapter<
       options: ollamaOptions,
       messages: this.formatMessages(options.messages),
       tools: this.convertToolsToOllamaFormat(options.tools),
+      ...(options.systemPrompts?.length
+        ? { system: options.systemPrompts.join('\n') }
+        : {}),
     }
   }
 }