feat(hooks): add category-skill-reminder hook (#1123)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: justsisyphus <justsisyphus@users.noreply.github.com>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/category-skill-reminder/index.ts

@@ -0,0 +1,165 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+import { getSessionAgent } from "../../features/claude-code-session-state"
+import { log } from "../../shared"
+
+/**
+ * Target agents that should receive category+skill reminders.
+ * These are orchestrator agents that delegate work to specialized agents.
+ */
+const TARGET_AGENTS = new Set([
+  "sisyphus",
+  "sisyphus-junior",
+  "atlas",
+])
+
+/**
+ * Tools that indicate the agent is doing work that could potentially be delegated.
+ * When these tools are used, we remind the agent about the category+skill system.
+ */
+const DELEGATABLE_WORK_TOOLS = new Set([
+  "edit",
+  "write",
+  "bash",
+  "read",
+  "grep",
+  "glob",
+])
+
+/**
+ * Tools that indicate the agent is already using delegation properly.
+ */
+const DELEGATION_TOOLS = new Set([
+  "delegate_task",
+  "call_omo_agent",
+  "task",
+])
+
+const REMINDER_MESSAGE = `
+[Category+Skill Reminder]
+
+You are an orchestrator agent. Consider whether this work should be delegated:
+
+**DELEGATE when:**
+- UI/Frontend work → category: "visual-engineering", skills: ["frontend-ui-ux"]
+- Complex logic/architecture → category: "ultrabrain"
+- Quick/trivial tasks → category: "quick"
+- Git operations → skills: ["git-master"]
+- Browser automation → skills: ["playwright"] or ["agent-browser"]
+
+**DO IT YOURSELF when:**
+- Gathering context/exploring codebase
+- Simple edits that are part of a larger task you're coordinating
+- Tasks requiring your full context understanding
+
+Example delegation:
+\`\`\`
+delegate_task(
+  category="visual-engineering",
+  load_skills=["frontend-ui-ux"],
+  description="Implement responsive navbar with animations",
+  run_in_background=true
+)
+\`\`\`
+`
+
+interface ToolExecuteInput {
+  tool: string
+  sessionID: string
+  callID: string
+  agent?: string
+}
+
+interface ToolExecuteOutput {
+  title: string
+  output: string
+  metadata: unknown
+}
+
+interface SessionState {
+  delegationUsed: boolean
+  reminderShown: boolean
+  toolCallCount: number
+}
+
+export function createCategorySkillReminderHook(_ctx: PluginInput) {
+  const sessionStates = new Map<string, SessionState>()
+
+  function getOrCreateState(sessionID: string): SessionState {
+    if (!sessionStates.has(sessionID)) {
+      sessionStates.set(sessionID, {
+        delegationUsed: false,
+        reminderShown: false,
+        toolCallCount: 0,
+      })
+    }
+    return sessionStates.get(sessionID)!
+  }
+
+  function isTargetAgent(sessionID: string, inputAgent?: string): boolean {
+    const agent = getSessionAgent(sessionID) ?? inputAgent
+    if (!agent) return false
+    const agentLower = agent.toLowerCase()
+    return TARGET_AGENTS.has(agentLower) || 
+           agentLower.includes("sisyphus") || 
+           agentLower.includes("atlas")
+  }
+
+  const toolExecuteAfter = async (
+    input: ToolExecuteInput,
+    output: ToolExecuteOutput,
+  ) => {
+    const { tool, sessionID } = input
+    const toolLower = tool.toLowerCase()
+
+    if (!isTargetAgent(sessionID, input.agent)) {
+      return
+    }
+
+    const state = getOrCreateState(sessionID)
+
+    if (DELEGATION_TOOLS.has(toolLower)) {
+      state.delegationUsed = true
+      log("[category-skill-reminder] Delegation tool used", { sessionID, tool })
+      return
+    }
+
+    if (!DELEGATABLE_WORK_TOOLS.has(toolLower)) {
+      return
+    }
+
+    state.toolCallCount++
+
+    if (state.toolCallCount >= 3 && !state.delegationUsed && !state.reminderShown) {
+      output.output += REMINDER_MESSAGE
+      state.reminderShown = true
+      log("[category-skill-reminder] Reminder injected", { 
+        sessionID, 
+        toolCallCount: state.toolCallCount 
+      })
+    }
+  }
+
+  const eventHandler = async ({ event }: { event: { type: string; properties?: unknown } }) => {
+    const props = event.properties as Record<string, unknown> | undefined
+
+    if (event.type === "session.deleted") {
+      const sessionInfo = props?.info as { id?: string } | undefined
+      if (sessionInfo?.id) {
+        sessionStates.delete(sessionInfo.id)
+      }
+    }
+
+    if (event.type === "session.compacted") {
+      const sessionID = (props?.sessionID ??
+        (props?.info as { id?: string } | undefined)?.id) as string | undefined
+      if (sessionID) {
+        sessionStates.delete(sessionID)
+      }
+    }
+  }
+
+  return {
+    "tool.execute.after": toolExecuteAfter,
+    event: eventHandler,
+  }
+}