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name: context-diet description: Optimize Claude Code context window usage. Identify what to keep in context vs fetch on-demand. Use when context is bloated, responses are slow, hitting token limits, or want to slim down context. allowed-tools: Read, Grep, Glob

Context Diet

Optimizes context window usage for efficient Claude Code sessions.

When to Use

• "Too much context"
• "Slim down context"
• "Hitting token limits"
• "Session feels slow"
• "What should I keep in context?"

Context Budget

Priority	Keep in Context	Fetch on Demand
Always	CLAUDE.md (~500 tokens)	Full file contents
Task-specific	Current file	Related files
Reference	Function signatures	Implementation details

This Repo's Essential Files

Always Relevant (Keep Short Reference)

File	What to Know	Size
CLAUDE.md	Commands, rules, structure	~500 tokens
Active file being edited	Full content	Varies

Fetch When Needed

Task	Files to Fetch
API work	apps/web/app/api/_lib/, specific route
Database	packages/db/src/schema.ts
Auth	packages/auth/src/index.ts
Tests	Specific test file only
Mobile	Specific screen/component

Skip (Already Known)

• Standard TypeScript patterns
• React/Next.js conventions
• Node.js fundamentals
• Common library usage

Procedure

Step 1: Assess Current Task

What's the user working on?

• Single file edit → Keep only that file
• Cross-package feature → Keep interface files, fetch impl
• Debugging → Keep error context, fetch related

Step 2: Identify Essential Context

For the current task, what's truly needed?

## Essential for This Task

1. {file1} - {why needed}
2. {file2} - {why needed}

## Can Fetch If Needed

- {file3} - Only if {condition}
- {file4} - Only if {condition}

## Skip

- {file5} - Already known / not relevant

Step 3: Context Shortlist

Generate a minimal file list:

## Context Shortlist

### Must Have (read fully)

- `{path}` - Active editing

### Reference Only (read signatures)

- `{path}` - Import types
- `{path}` - Check pattern

### Fetch If Blocked

- `{path}` - Implementation details

Step 4: Recommend Actions

## Recommendations

### To Reduce Context Now

1. {action} - saves ~{tokens}
2. {action} - saves ~{tokens}

### For Future Sessions

- Start with: "I'm working on {task}. Files: {shortlist}"
- Use subagents for exploration
- Split large tasks into focused sessions

Context Patterns

Bad (Context Bloat)

"Read the entire codebase"
"Show me all the packages"
"Give me everything about auth"

Good (Focused)

"I'm editing apps/web/app/api/users/route.ts"
"Show me the getCurrentUser function signature"
"What tables are in the schema?"

Token Estimates

Item	~Tokens
Average TypeScript file	500-1500
Large component	1000-2000
Schema file	800-1200
Full CLAUDE.md	500
Test file	400-800

Guardrails

• DO NOT recommend skipping CLAUDE.md
• Always include the file being actively edited
• Prefer interfaces over implementations
• Suggest subagents for broad exploration
• Be specific about what "fetch if needed" means