fix(cursor): register plugin in all discovery/resolution layers

Address PR review feedback from #1076 to make Cursor agent fully functional.

## Changes

### Plugin Registration (High Severity Fixes)
- **core/plugin-registry.ts**: Add cursor to BUILTIN_PLUGINS array for config-based resolution
- **cli/plugins.ts**: Import and register cursor in agentPlugins map for getAgent/getAgentByName
- **cli/detect-agent.ts**: Add cursor to AGENT_PLUGINS array for detectAvailableAgents()
- **web/services.ts**: Import and register cursor plugin for dashboard SessionManager/LifecycleManager
- **web/package.json**: Add @composio/ao-plugin-agent-cursor dependency

### Activity Detection Fix (Medium Severity)
- **cursor/index.ts**: Remove overly broad blocked detection patterns (error:/failed:)
  - Compiler errors, test failures, and linter output are normal tool output
  - Terminal-based detection can't distinguish between actionable agent errors and normal output
  - Follow Aider/OpenCode pattern: only Claude Code detects blocked (has native JSONL)
  - Added comment explaining why blocked detection is removed
- **cursor/index.test.ts**: Remove blocked detection test cases

## Why These Changes Are Needed

Before these fixes:
- `defaults.agent: cursor` in config would throw "Unknown agent plugin: cursor"
- `ao spawn --agent cursor` would fail
- Dashboard couldn't resolve cursor agent (SessionManager/LifecycleManager failures)
- `detectAvailableAgents()` never discovered Cursor
- False "blocked" states when agent encountered normal compiler errors

After these fixes:
- Cursor agent fully discoverable and usable via config and CLI
- Dashboard can spawn and manage Cursor sessions
- Activity detection matches other terminal-based agents (Aider, OpenCode)
- No false positives from normal tool output

## Testing
- ✅ cursor plugin tests: 51/51 passing (reduced from 52 due to removed blocked tests)
- ✅ core typecheck: clean
- ✅ web typecheck: clean
- ✅ CLI can import cursor plugin without errors

Addresses: ComposioHQ/agent-orchestrator#1076

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

packages/cli/src/lib/detect-agent.ts

@@ -18,6 +18,7 @@ const AGENT_PLUGINS: Array<{ name: string; pkg: string }> = [
   { name: "claude-code", pkg: "@composio/ao-plugin-agent-claude-code" },
   { name: "aider", pkg: "@composio/ao-plugin-agent-aider" },
   { name: "codex", pkg: "@composio/ao-plugin-agent-codex" },
+  { name: "cursor", pkg: "@composio/ao-plugin-agent-cursor" },
   { name: "opencode", pkg: "@composio/ao-plugin-agent-opencode" },
 ];
 

packages/cli/src/lib/plugins.ts

@@ -2,6 +2,7 @@ import type { Agent, OrchestratorConfig, PluginRegistry, SCM } from "@composio/a
 import claudeCodePlugin from "@composio/ao-plugin-agent-claude-code";
 import codexPlugin from "@composio/ao-plugin-agent-codex";
 import aiderPlugin from "@composio/ao-plugin-agent-aider";
+import cursorPlugin from "@composio/ao-plugin-agent-cursor";
 import opencodePlugin from "@composio/ao-plugin-agent-opencode";
 import githubSCMPlugin from "@composio/ao-plugin-scm-github";
 
@@ -9,6 +10,7 @@ const agentPlugins: Record<string, { create(): Agent }> = {
   "claude-code": claudeCodePlugin,
   codex: codexPlugin,
   aider: aiderPlugin,
+  cursor: cursorPlugin,
   opencode: opencodePlugin,
 };
 

packages/core/src/plugin-registry.ts

@@ -38,6 +38,7 @@ const BUILTIN_PLUGINS: Array<{ slot: PluginSlot; name: string; pkg: string }> =
   { slot: "agent", name: "claude-code", pkg: "@composio/ao-plugin-agent-claude-code" },
   { slot: "agent", name: "codex", pkg: "@composio/ao-plugin-agent-codex" },
   { slot: "agent", name: "aider", pkg: "@composio/ao-plugin-agent-aider" },
+  { slot: "agent", name: "cursor", pkg: "@composio/ao-plugin-agent-cursor" },
   { slot: "agent", name: "opencode", pkg: "@composio/ao-plugin-agent-opencode" },
   // Workspaces
   { slot: "workspace", name: "worktree", pkg: "@composio/ao-plugin-workspace-worktree" },

packages/plugins/agent-cursor/src/index.test.ts

@@ -322,11 +322,6 @@ describe("detectActivity", () => {
     expect(agent.detectActivity("Press Enter to continue")).toBe("waiting_input");
   });
 
-  it("returns blocked for error messages", () => {
-    expect(agent.detectActivity("error: failed to connect")).toBe("blocked");
-    expect(agent.detectActivity("failed: timeout exceeded")).toBe("blocked");
-  });
-
   it("returns active for non-empty terminal output", () => {
     expect(agent.detectActivity("cursor is processing files\n")).toBe("active");
   });

packages/plugins/agent-cursor/src/index.ts

@@ -178,9 +178,12 @@ function createCursorAgent(): Agent {
       if (/proceed\?/i.test(tail)) return "waiting_input";
       if (/Press Enter to continue/i.test(tail)) return "waiting_input";
 
-      // Check for error indicators
-      if (/error:/i.test(tail)) return "blocked";
-      if (/failed:/i.test(tail)) return "blocked";
+      // Note: "blocked" detection removed — compiler errors, test failures, and linter
+      // messages are extremely common in normal tool output. Unlike Claude Code (which
+      // has native JSONL with rich "error" types), terminal-based detection can't
+      // distinguish between actionable agent errors and normal tool output.
+      // If Cursor CLI provides native JSONL in the future, blocked detection can be
+      // added to getActivityState() based on JSONL entry types.
 
       return "active";
     },

packages/web/package.json

@@ -29,6 +29,7 @@
   "dependencies": {
     "@composio/ao-core": "workspace:*",
     "@composio/ao-plugin-agent-claude-code": "workspace:*",
+    "@composio/ao-plugin-agent-cursor": "workspace:*",
     "@composio/ao-plugin-agent-opencode": "workspace:*",
     "@composio/ao-plugin-runtime-tmux": "workspace:*",
     "@composio/ao-plugin-scm-github": "workspace:*",

packages/web/src/lib/services.ts

@@ -39,6 +39,7 @@ import {
 // Static plugin imports — webpack needs these to be string literals
 import pluginRuntimeTmux from "@composio/ao-plugin-runtime-tmux";
 import pluginAgentClaudeCode from "@composio/ao-plugin-agent-claude-code";
+import pluginAgentCursor from "@composio/ao-plugin-agent-cursor";
 import pluginAgentOpencode from "@composio/ao-plugin-agent-opencode";
 import pluginWorkspaceWorktree from "@composio/ao-plugin-workspace-worktree";
 import pluginScmGithub from "@composio/ao-plugin-scm-github";
@@ -81,6 +82,7 @@ async function initServices(): Promise<Services> {
   // Register plugins explicitly (webpack can't handle dynamic import() in core)
   registry.register(pluginRuntimeTmux);
   registry.register(pluginAgentClaudeCode);
+  registry.register(pluginAgentCursor);
   registry.register(pluginAgentOpencode);
   registry.register(pluginWorkspaceWorktree);
   registry.register(pluginScmGithub);

pnpm-lock.yaml

@@ -600,6 +600,9 @@ importers:
       '@composio/ao-plugin-agent-claude-code':
         specifier: workspace:*
         version: link:../plugins/agent-claude-code
+      '@composio/ao-plugin-agent-cursor':
+        specifier: workspace:*
+        version: link:../plugins/agent-cursor
       '@composio/ao-plugin-agent-opencode':
         specifier: workspace:*
         version: link:../plugins/agent-opencode