docs: mode temperature

packages/web/src/content/docs/docs/modes.mdx

@@ -97,6 +97,51 @@ Use the `model` config to override the default model for this mode. Useful for u
 
 ---
 
+### Temperature
+
+Control the randomness and creativity of the AI's responses with the `temperature` config. Lower values make responses more focused and deterministic, while higher values increase creativity and variability.
+
+```json title="opencode.json"
+{
+  "mode": {
+    "plan": {
+      "temperature": 0.1
+    },
+    "creative": {
+      "temperature": 0.8
+    }
+  }
+}
+```
+
+Temperature values typically range from 0.0 to 1.0:
+
+- **0.0-0.2**: Very focused and deterministic responses, ideal for code analysis and planning
+- **0.3-0.5**: Balanced responses with some creativity, good for general development tasks
+- **0.6-1.0**: More creative and varied responses, useful for brainstorming and exploration
+
+```json title="opencode.json"
+{
+  "mode": {
+    "analyze": {
+      "temperature": 0.1,
+      "prompt": "{file:./prompts/analysis.txt}"
+    },
+    "build": {
+      "temperature": 0.3
+    },
+    "brainstorm": {
+      "temperature": 0.7,
+      "prompt": "{file:./prompts/creative.txt}"
+    }
+  }
+}
+```
+
+If no temperature is specified, opencode uses model-specific defaults (typically 0 for most models, 0.55 for Qwen models).
+
+---
+
 ### Prompt
 
 Specify a custom system prompt file for this mode with the `prompt` config. The prompt file should contain instructions specific to the mode's purpose.