Ultrathink Trigger Skill

Ultrathink Trigger

Automatically invoke maximum reasoning depth for complex problems.

Complexity Indicators

| Signal | Weight | Example | | ------------------------------ | ------ | ---------------------------------- | | Files affected > 5 | +2 | Refactoring across modules | | Unfamiliar language/framework | +3 | First time with codebase | | Architecture decision | +4 | Choosing patterns | | 2+ failed fix attempts | +3 | Root cause unclear | | Multi-domain interaction | +2 | Frontend + Backend + DB | | Security implications | +3 | Auth, permissions, secrets | | Performance-critical code | +2 | Hot paths, algorithms | | Breaking change potential | +3 | API changes, schema migrations |

Threshold

If total weight >= 5: Trigger ultrathink mode

Invocation

Prefix complex analysis with one of:

"Think harder about this:"
"ultrathink:"
"Take your time to deeply analyze:"

These phrases trigger Claude's extended thinking mode for more thorough analysis.

Integration Points

With /fix command

After 2 failed attempts, automatically invoke:

ultrathink: What are all the possible root causes?
What assumptions am I making? What haven't I checked yet?

With /brainstorm command

Auto-triggers when topic complexity >= 5 (or --deep flag). Applied to EVALUATE and SYNTHESIZE phases:

ultrathink: Deeply analyze these options considering trade-offs,
edge cases, maintainability, and long-term implications.

Flags:

--deep - Force ultrathink regardless of complexity
--quick - Suppress auto-detect, stay fast

With orchestrator INNOVATE phase

For architecture decisions:

ultrathink: Evaluate these approaches considering
maintainability, performance, security, and complexity.

With sequential-thinking

For multi-step complex analysis:

mcp__sequential_thinking__sequentialthinking({
  thought: "ultrathink: [complex problem]",
  thoughtNumber: 1,
  totalThoughts: 10, // More steps for deep analysis
  nextThoughtNeeded: true
})

When to Use Proactively

Architecture Decisions: Before proposing patterns or structure
Debugging Deadlock: After 2+ failed fix attempts
Security Analysis: Any auth, permission, or secret handling
Performance Optimization: Before optimizing hot paths
Breaking Changes: Before proposing API/schema changes
Unfamiliar Code: First encounter with a new codebase area

Example Workflow

1. Encounter complex problem
2. Calculate complexity weight:
   - Multi-file change: +2
   - Architecture decision: +4
   - Total: 6 (>= 5, triggers ultrathink)
3. Invoke: "ultrathink: Design the data flow for..."
4. Extended analysis produces thorough solution
5. Proceed with implementation

Anti-Patterns

Using ultrathink for simple, well-understood tasks
Skipping ultrathink for complex problems to "save time"
Not recalculating complexity when scope changes

Agent Skills: Ultrathink Trigger

Install this agent skill to your local

Skill Files