feat: auto-disable DCP on Desktop clients

DCP is incompatible with Desktop/Web clients due to breaking changes in @opencode-ai/plugin. Add automatic detection of Electron/Desktop environment and disable plugin with console message. Update README to document this known issue.

Author: Michel Belleau

README.md

@@ -21,6 +21,8 @@ Using `@latest` ensures you always get the newest version automatically when Ope
 
 Restart OpenCode. The plugin will automatically start optimizing your sessions.
 
+> **Important:** DCP is designed for the TUI (terminal) version of OpenCode. It auto-disables on Desktop/Web clients (see [Known Issues](#known-issues)).
+
 ## How Pruning Works
 
 DCP uses multiple tools and strategies to reduce context size:
@@ -147,6 +149,25 @@ When enabled, turn protection prevents tool outputs from being pruned for a conf
 
 ### Protected Tools
 
+## Known Issues
+
+### Desktop / Web App Incompatibility
+
+DCP is currently incompatible with OpenCode's desktop and web clients. This is a known issue tracked in [Issue #304](https://github.com/Opencode-DCP/opencode-dynamic-context-pruning/issues/304).
+
+**Symptoms on Desktop/Web:**
+
+- `/dcp` commands fail with `TypeError: {} is not iterable`
+- `discard` and `extract` tools fail with the same error
+- Pruning notifications don't display correctly
+
+**Solution:**
+
+- DCP automatically detects when running on Desktop (Electron-based clients) and **auto-disables itself** with a console message
+- Use the TUI version of OpenCode for full DCP functionality
+
+**Status:** The plugin is designed for TUI usage only. Desktop/Web clients have breaking changes in their `@opencode-ai/plugin` implementation that haven't been addressed yet.
+
 By default, these tools are always protected from pruning across all strategies:
 `task`, `todowrite`, `todoread`, `discard`, `extract`, `batch`, `write`, `edit`
 

index.ts

@@ -9,13 +9,24 @@ import {
     createSystemPromptHandler,
 } from "./lib/hooks"
 
+function isDesktop(): boolean {
+    return process.env.ELECTRON_RUN_AS_NODE !== undefined
+}
+
 const plugin: Plugin = (async (ctx) => {
     const config = getConfig(ctx)
 
     if (!config.enabled) {
         return {}
     }
 
+    if (isDesktop()) {
+        console.log(
+            "DCP: Auto-disabled on Desktop – use the TUI version for full DCP functionality",
+        )
+        return {}
+    }
+
     const logger = new Logger(config.debug)
     const state = createSessionState()