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name: context-loader description: Explains how SpecWeave achieves context efficiency through Claude's native progressive disclosure mechanism and sub-agent parallelization. Skills load only when relevant, sub-agents isolate context. Activates when users ask about context loading, token usage, or how SpecWeave scales. Keywords: context loading, progressive disclosure, token efficiency, sub-agents, context management.

Context Management in SpecWeave

Overview

SpecWeave achieves efficient context usage through two native Claude Code mechanisms:

1. Progressive Disclosure (Skills) - Claude's built-in skill loading system
2. Sub-Agent Parallelization - Isolated context windows for parallel work

Important: SpecWeave does NOT use custom context manifests or caching systems. It leverages Claude's native capabilities.

---

1. Progressive Disclosure (Skills)

How It Works

Claude Code uses a two-level progressive disclosure system for skills:

Level 1: Metadata Only (Always Loaded)

Copy---
name: nextjs
description: NextJS 14+ implementation specialist. Creates App Router projects...
---

What Claude sees initially:

• Only the YAML frontmatter (name + description)
• ~50-100 tokens per skill
• All skills' metadata is visible
• Claude can decide which skills are relevant

Level 2: Full Skill Content (Loaded On-Demand)

Copy# NextJS Skill

[Full documentation, examples, best practices...]
[Could be 5,000+ tokens]

What Claude loads:

• Full SKILL.md content only if skill is relevant to current task
• Prevents loading 35+ skills (175,000+ tokens) when you only need 2-3
• This is the actual mechanism that saves tokens

Example Workflow

CopyUser: "Create a Next.js authentication page"
    ↓
Claude reviews skill metadata (35 skills × 75 tokens = 2,625 tokens)
    ↓
Claude determines relevant skills:
  - nextjs (matches "Next.js")
  - frontend (matches "page")
  - (NOT loading: python-backend, devops, hetzner-provisioner, etc.)
    ↓
Claude loads ONLY relevant skills:
  - nextjs: 5,234 tokens
  - frontend: 3,891 tokens
    ↓
Total loaded: 9,125 tokens (vs 175,000+ if loading all skills)
Token reduction: ~95%

References

• What are Skills?
• Agent Skills Engineering

"Skills work through progressive disclosure—Claude determines which Skills are relevant and loads the information it needs to complete that task, helping to prevent context window overload."

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2. Sub-Agent Parallelization

How It Works

Sub-agents in Claude Code have isolated context windows:

CopyMain conversation (100K tokens used)
    ↓
Launches 3 sub-agents in parallel
    ↓
├─ Sub-agent 1: Fresh context (0K tokens used)
├─ Sub-agent 2: Fresh context (0K tokens used)
└─ Sub-agent 3: Fresh context (0K tokens used)

Benefits:

1. Context Isolation

   • Each sub-agent starts with empty context
   • Doesn't inherit main conversation's 100K tokens
   • Can load its own relevant skills

2. Parallelization

   • Multiple agents work simultaneously
   • Each with own context budget
   • Results merged back to main conversation

3. Token Multiplication

   • Main: 200K token limit
   • Sub-agent 1: 200K token limit
   • Sub-agent 2: 200K token limit
   • Effective capacity: 600K+ tokens across parallel work

Example Workflow

CopyUser: "Build a full-stack Next.js app with auth, payments, and admin"
    ↓
Main conversation launches 3 sub-agents in parallel:
    ↓
├─ Sub-agent 1 (Frontend)
│  - Loads: nextjs, frontend skills
│  - Context: 12K tokens
│  - Implements: Auth UI, payment forms
│
├─ Sub-agent 2 (Backend)
│  - Loads: nodejs-backend, security skills
│  - Context: 15K tokens
│  - Implements: API routes, auth logic
│
└─ Sub-agent 3 (DevOps)
   - Loads: devops, hetzner-provisioner skills
   - Context: 8K tokens
   - Implements: Deployment configs
    ↓
All 3 work in parallel with isolated contexts
    ↓
Results merged back to main conversation
    ↓
Total effective context: 35K tokens across 3 agents
(vs 175K+ if loaded all skills in main conversation)

References

• Sub-Agents Documentation

---

Actual Token Savings

Progressive Disclosure Savings

Scenario: User asks about Next.js

Without progressive disclosure:

CopyLoad all 35 skills: ~175,000 tokens
Context bloat: Massive

With progressive disclosure:

CopyMetadata (all skills): ~2,625 tokens
Load relevant (2 skills): ~9,000 tokens
Total: ~11,625 tokens
Reduction: ~93%

Sub-Agent Savings

Scenario: Complex multi-domain task

Single agent approach:

CopyLoad all relevant skills: ~50,000 tokens
Main conversation history: ~80,000 tokens
Total context used: ~130,000 tokens
Risk: Approaching context limit

Sub-agent approach:

CopyMain conversation: ~5,000 tokens (coordination only)
Sub-agent 1: ~15,000 tokens (isolated)
Sub-agent 2: ~18,000 tokens (isolated)
Sub-agent 3: ~12,000 tokens (isolated)
Total: ~50,000 tokens across 4 contexts
Reduction: ~62% (130K → 50K)

Note: Exact percentages vary by task complexity. These are approximate based on typical usage patterns.

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How SpecWeave Leverages These Mechanisms

1. Skill Organization (Progressive Disclosure)

SpecWeave organizes 35+ skills with clear, focused descriptions:

Copy# Good: Focused description
---
name: nextjs
description: NextJS 14+ App Router specialist. Server Components, SSR, routing.
---

# Bad: Vague description
---
name: frontend
description: Does frontend stuff
---

Why this matters:

• Clear descriptions help Claude identify relevance quickly
• Prevents loading irrelevant skills
• Maximizes progressive disclosure benefits

2. Agent Coordination (Sub-Agent Parallelization)

SpecWeave's role-orchestrator skill automatically:

• Detects multi-domain tasks
• Launches specialized sub-agents (PM, Architect, DevOps, etc.)
• Each sub-agent loads only its relevant skills
• Coordinates results back to main conversation

Example:

CopyUser: "/sw:inc 'Full-stack SaaS with Stripe payments'"
    ↓
role-orchestrator activates
    ↓
Launches sub-agents in parallel:
  ├─ PM agent (requirements)
  ├─ Architect agent (system design)
  ├─ Security agent (threat model)
  └─ DevOps agent (deployment)
    ↓
Each loads only relevant skills in isolated context
    ↓
Results merged into increment spec

---

Common Misconceptions

❌ Myth 1: "SpecWeave has custom context manifests"

Reality: No. SpecWeave uses Claude's native progressive disclosure. Skills load based on Claude's relevance detection, not custom YAML manifests.

❌ Myth 2: "SpecWeave caches loaded context"

Reality: No custom caching. Claude Code handles caching internally (if applicable). SpecWeave doesn't implement additional caching layers.

❌ Myth 3: "70-90% token reduction"

Reality: Token savings vary by task:

• Simple tasks: 90%+ (load 1-2 skills vs all 35)
• Complex tasks: 50-70% (load 5-10 skills + use sub-agents)
• Exact percentages depend on task complexity

✅ Truth: "It just works"

Reality: Progressive disclosure and sub-agents are automatic. You don't configure them. Claude handles skill loading, sub-agent context isolation happens automatically when agents are launched.

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Best Practices

For Skill Descriptions

Do:

• Be specific about what the skill does
• Include trigger keywords users might say
• List technologies/frameworks explicitly

Don't:

• Write vague descriptions ("helps with coding")
• Omit key activation triggers
• Mix multiple unrelated domains in one skill

For Sub-Agent Usage

When to use sub-agents:

• Multi-domain tasks (frontend + backend + devops)
• Parallel work (multiple features simultaneously)
• Large codebase exploration (different modules)

When NOT to use sub-agents:

• Simple single-domain tasks
• Sequential work requiring shared context
• When main conversation context is already low

---

Debugging Context Usage

Check Active Skills

When Claude mentions using a skill:

CopyUser: "Create a Next.js page"
Claude: "🎨 Using nextjs skill..."

This means:

• Progressive disclosure worked
• Only nextjs skill loaded (not all 35)
• Context efficient

Check Sub-Agent Usage

When Claude mentions launching agents:

CopyClaude: "🤖 Launching 3 specialized agents in parallel..."

This means:

• Sub-agent parallelization active
• Each agent has isolated context
• Efficient multi-domain processing

---

Summary

SpecWeave achieves context efficiency through:

1. Progressive Disclosure (Native Claude)

   • Skills load only when relevant
   • Metadata-first approach
   • 90%+ savings on simple tasks

2. Sub-Agent Parallelization (Native Claude Code)

   • Isolated context windows
   • Parallel processing
   • 50-70% savings on complex tasks

No custom manifests. No custom caching. Just smart use of Claude's native capabilities.

---

References

• Claude Skills Documentation
• Agent Skills Engineering Blog
• Sub-Agents Documentation