feat(ollama): add OCO_OLLAMA_THINK config to control thinking mode

Adds support for passing the `think` param to Ollama's /api/chat endpoint,
allowing users to disable reasoning blocks on models like qwen3.5 via
`oco config set OCO_OLLAMA_THINK=false`.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: keith666666

src/commands/config.ts

@@ -29,7 +29,8 @@ export enum CONFIG_KEYS {
   OCO_API_CUSTOM_HEADERS = 'OCO_API_CUSTOM_HEADERS',
   OCO_OMIT_SCOPE = 'OCO_OMIT_SCOPE',
   OCO_GITPUSH = 'OCO_GITPUSH', // todo: deprecate
-  OCO_HOOK_AUTO_UNCOMMENT = 'OCO_HOOK_AUTO_UNCOMMENT'
+  OCO_HOOK_AUTO_UNCOMMENT = 'OCO_HOOK_AUTO_UNCOMMENT',
+  OCO_OLLAMA_THINK = 'OCO_OLLAMA_THINK'
 }
 
 export enum CONFIG_MODES {
@@ -838,6 +839,15 @@ export const configValidators = {
       typeof value === 'boolean',
       'Must be true or false'
     );
+  },
+
+  [CONFIG_KEYS.OCO_OLLAMA_THINK](value: any) {
+    validateConfig(
+      CONFIG_KEYS.OCO_OLLAMA_THINK,
+      typeof value === 'boolean',
+      'Must be true or false'
+    );
+    return value;
   }
 };
 
@@ -905,6 +915,7 @@ export type ConfigType = {
   [CONFIG_KEYS.OCO_OMIT_SCOPE]: boolean;
   [CONFIG_KEYS.OCO_TEST_MOCK_TYPE]: string;
   [CONFIG_KEYS.OCO_HOOK_AUTO_UNCOMMENT]: boolean;
+  [CONFIG_KEYS.OCO_OLLAMA_THINK]?: boolean;
 };
 
 export const defaultConfigPath = pathJoin(homedir(), '.opencommit');

src/engine/Engine.ts

@@ -13,6 +13,7 @@ export interface AiEngineConfig {
   baseURL?: string;
   proxy?: string;
   customHeaders?: Record<string, string>;
+  ollamaThink?: boolean;
 }
 
 type Client =

src/engine/ollama.ts

@@ -4,7 +4,9 @@ import { normalizeEngineError } from '../utils/engineErrorHandler';
 import { removeContentTags } from '../utils/removeContentTags';
 import { AiEngine, AiEngineConfig } from './Engine';
 
-interface OllamaConfig extends AiEngineConfig {}
+interface OllamaConfig extends AiEngineConfig {
+  ollamaThink?: boolean;
+}
 
 const DEFAULT_OLLAMA_URL = 'http://localhost:11434';
 const OLLAMA_CHAT_PATH = '/api/chat';
@@ -32,12 +34,15 @@ export class OllamaEngine implements AiEngine {
   async generateCommitMessage(
     messages: Array<OpenAI.Chat.Completions.ChatCompletionMessageParam>
   ): Promise<string | undefined> {
-    const params = {
+    const params: Record<string, any> = {
       model: this.config.model ?? 'mistral',
       messages,
       options: { temperature: 0, top_p: 0.1 },
       stream: false
     };
+    if (typeof this.config.ollamaThink === 'boolean') {
+      params.think = this.config.ollamaThink;
+    }
     try {
       const response = await this.client.post(this.chatUrl, params);
 

src/utils/engine.ts

@@ -54,7 +54,10 @@ export function getEngine(): AiEngine {
 
   switch (provider) {
     case OCO_AI_PROVIDER_ENUM.OLLAMA:
-      return new OllamaEngine(DEFAULT_CONFIG);
+      return new OllamaEngine({
+        ...DEFAULT_CONFIG,
+        ollamaThink: config.OCO_OLLAMA_THINK
+      });
 
     case OCO_AI_PROVIDER_ENUM.ANTHROPIC:
       return new AnthropicEngine(DEFAULT_CONFIG);

test/unit/ollama.test.ts

@@ -0,0 +1,64 @@
+import { OllamaEngine } from '../../src/engine/ollama';
+
+describe('OllamaEngine', () => {
+  it('sends think=false when configured', async () => {
+    const engine = new OllamaEngine({
+      apiKey: 'ollama',
+      model: 'qwen3.5:2b',
+      maxTokensOutput: 500,
+      maxTokensInput: 4096,
+      ollamaThink: false
+    });
+
+    const post = jest.fn().mockResolvedValue({
+      data: {
+        message: {
+          content: 'feat: add support for ollama think config'
+        }
+      }
+    });
+
+    engine.client = { post } as any;
+
+    await engine.generateCommitMessage([
+      { role: 'user', content: 'diff --git a/file b/file' }
+    ]);
+
+    expect(post).toHaveBeenCalledWith(
+      'http://localhost:11434/api/chat',
+      expect.objectContaining({
+        think: false
+      })
+    );
+  });
+
+  it('omits think when not configured', async () => {
+    const engine = new OllamaEngine({
+      apiKey: 'ollama',
+      model: 'qwen3.5:2b',
+      maxTokensOutput: 500,
+      maxTokensInput: 4096
+    });
+
+    const post = jest.fn().mockResolvedValue({
+      data: {
+        message: {
+          content: 'feat: add support for ollama think config'
+        }
+      }
+    });
+
+    engine.client = { post } as any;
+
+    await engine.generateCommitMessage([
+      { role: 'user', content: 'diff --git a/file b/file' }
+    ]);
+
+    expect(post).toHaveBeenCalledWith(
+      'http://localhost:11434/api/chat',
+      expect.not.objectContaining({
+        think: expect.anything()
+      })
+    );
+  });
+});