[Docs] Document OpenCode Go model limits

docs/providers/index.json

@@ -96,6 +96,12 @@
       "extension": true,
       "cloud": false
     },
+    {
+      "id": "providers/opencode-go",
+      "title": "OpenCode Go",
+      "extension": true,
+      "cloud": false
+    },
     {
       "id": "providers/openrouter",
       "title": "OpenRouter",

docs/providers/opencode-go.md

@@ -0,0 +1,32 @@
+---
+sidebar_label: OpenCode Go
+description: Connect Zoo Code to an OpenCode Go subscription and use its dynamically discovered coding models with accurate context limits.
+keywords:
+  - opencode go
+  - open models
+  - zoo code
+  - api provider
+  - context window
+---
+
+# Using OpenCode Go With Zoo Code
+
+OpenCode Go is a subscription provider for a curated set of coding models. Zoo Code fetches the available model IDs from OpenCode Go, so the model picker stays current as the service adds or removes models.
+
+**Website:** [https://opencode.ai/docs/go/](https://opencode.ai/docs/go/)
+
+## Configuration
+
+1. Subscribe to OpenCode Go and copy your API key from the OpenCode console.
+2. Open Zoo Code settings with the gear icon (<Codicon name="gear" />).
+3. Select **OpenCode Go** as the API provider.
+4. Enter your OpenCode Go API key.
+5. Select a model from the dynamically loaded model list.
+
+## Model Limits
+
+OpenCode Go's model-list endpoint may return only a model ID, without context-window or maximum-output metadata. Zoo Code maintains limits for the models exposed by the service and uses live metadata when OpenCode Go supplies it. This keeps the context meter and output-token controls aligned with the selected model instead of applying one generic limit to every model.
+
+The available models and their limits can change. Refresh the model list in Zoo Code after OpenCode Go updates its catalog.
+
+For the current model catalog, endpoints, and usage limits, see the [OpenCode Go documentation](https://opencode.ai/docs/go/).