Ultrathink

Ultrathink activates the Sequential Thinking MCP tool (mcp__sequential_thinking__sequentialthinking) to enable deep, structured reasoning through complex problems.

When to Use

Invoke ultrathink when:

• User explicitly requests it ("use ultrathink", "ultrathink this")
• Complex problems requiring step-by-step decomposition
• Planning and design with room for revision
• Analysis that might need course correction
• Problems where full scope isn't initially clear
• Multi-step solutions requiring maintained context
• Situations requiring hypothesis generation and verification

How to Use

Call the sequential thinking tool with structured thoughts:

mcp__sequential_thinking__sequentialthinking:
  thought: "Your current thinking step"
  nextThoughtNeeded: true/false
  thoughtNumber: 1
  totalThoughts: 5 (estimate, can adjust)

Parameters

Parameter	Type	Required	Description
thought	string	Yes	Current thinking step - analysis, revision, question, or realization
nextThoughtNeeded	boolean	Yes	True if more thinking needed, false when done
thoughtNumber	integer	Yes	Current thought number in sequence
totalThoughts	integer	Yes	Estimated total thoughts (can adjust up/down)
isRevision	boolean	No	Whether this revises previous thinking
revisesThought	integer	No	Which thought number is being reconsidered
branchFromThought	integer	No	Branching point thought number
branchId	string	No	Branch identifier
needsMoreThoughts	boolean	No	Signal that more thoughts needed at "end"

Key Capabilities

1. Dynamic adjustment: Revise total thought count as understanding evolves
2. Revision support: Question or revise previous thoughts
3. Branching: Explore alternative approaches from any point
4. Hypothesis cycle: Generate hypothesis, verify, repeat until satisfied
5. Non-linear thinking: Don't need to build linearly - can backtrack

Process Pattern

1. Start with initial estimate of needed thoughts
2. Break down the problem systematically
3. Question or revise previous thoughts as needed
4. Generate solution hypotheses when appropriate
5. Verify hypotheses against the chain of thought
6. Add more thoughts if needed, even at the "end"
7. Express uncertainty when present
8. Set nextThoughtNeeded: false only when truly done

Example

Thought 1: "Let me analyze this authentication bug. The user reports login failures after password reset..."
Thought 2: "Looking at the code flow: reset generates token -> user clicks link -> new password set. The issue might be..."
Thought 3: "Hypothesis: The session isn't being invalidated after password change. Let me verify..."
Thought 4 (revision): "Actually, reconsidering thought 2 - the token expiry might be the issue, not session..."
Thought 5: "Verified: Token expiry is set to 1 hour but email delivery can take longer. Solution: extend to 24 hours."

Best Practices

• Start with reasonable thought estimate (3-7 for most problems)
• Don't hesitate to revise or add thoughts
• Mark revisions with isRevision: true and revisesThought: N
• Express uncertainty rather than guessing
• Use branching for exploring alternatives
• Only set nextThoughtNeeded: false when confident in solution