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nav-start

Complete framework for context-efficient AI development - Philosophy, Metrics, Education, Skills, and Agents. Master context engineering principles through interactive learning. Achieve 92% token reduction with proven strategies.

name: nav-start
description: Load Navigator documentation navigator when starting development session, resuming work, or beginning new feature. Use when user mentions starting work, beginning session, resuming after break, or checking project status.
allowed-tools: Read, Bash
version: 1.0.0
Aleks Petrov
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Comment utiliser cette compétence ?
  • Cliquez sur le bouton d'installation pour copier le plugin bin dans le presse-papiers.
  • Ouvrez votre app Claude et collez le plugin bin pour installer la compétence.

Navigator Navigator Skill

Load the Navigator documentation navigator to start your development session with optimized context.

When to Invoke

Invoke this skill when the user:

  • Says "start my session", "begin work", "start working"
  • Says "load the navigator", "show me the docs"
  • Asks "what should I work on?"
  • Mentions "resume work", "continue from where I left off"
  • Asks about project structure or current tasks

DO NOT invoke if:

  • User already ran /nav:start command this conversation
  • Navigator already loaded (check conversation history)
  • User is in middle of implementation (only invoke at session start)

Execution Steps

Step 1: Check Navigator Version

Check if user is running latest Navigator version:

# Run version checker (optional - doesn't block session start)
if [ -f "scripts/check-version.sh" ]; then
  bash scripts/check-version.sh

  # Note: Exit code 1 means update available, but don't block session
  # Exit code 0 means up to date
  # Exit code 2 means cannot check (network issue)
fi

Version check behavior:

  • If update available: Show notification, continue session
  • If up to date: Show ✅, continue session
  • If cannot check: Skip silently, continue session

Never block session start due to version check.

Step 2: Check Navigator Initialization

Check if .agent/DEVELOPMENT-README.md exists:

if [ ! -f ".agent/DEVELOPMENT-README.md" ]; then
  echo "❌ Navigator not initialized in this project"
  echo ""
  echo "Run /nav:init to set up Navigator structure first."
  exit 1
fi

If not found, inform user to run /nav:init first.

Step 3: Load Documentation Navigator

Read the navigator file:

Read(
  file_path: ".agent/DEVELOPMENT-README.md"
)

This is the lightweight index (~2k tokens) that tells you:

  • What documentation exists
  • When to load specific docs
  • Current task focus
  • Project structure overview

Step 4: Check for Active Context Marker

Check if there's an active marker from previous /nav:compact:

if [ -f ".agent/.context-markers/.active" ]; then
  marker_file=$(cat .agent/.context-markers/.active)
  echo "🔄 Active context marker detected!"
  echo ""
  echo "Marker: $marker_file"
  echo ""
  echo "This marker was saved during your last /nav:compact."
  echo "Load it to continue where you left off?"
  echo ""
  echo "[Y/n]:"
fi

If user confirms (Y or Enter):

  • Read the marker file: Read(file_path: ".agent/.context-markers/{marker_file}")
  • Delete .active file: rm .agent/.context-markers/.active
  • Show confirmation: "✅ Context restored from marker!"

If user declines (n):

  • Delete .active file
  • Show: "Skipping marker load. You can load it later with /nav:markers"

Step 5: Load Navigator Configuration

Read configuration:

Read(
  file_path: ".agent/.nav-config.json"
)

Parse:

  • project_management: Which PM tool (linear, github, jira, none)
  • task_prefix: Task ID format (TASK, GH, LIN, etc.)
  • team_chat: Team notifications (slack, discord, none)

Step 6: Check PM Tool for Assigned Tasks

If PM tool is Linear:

# Check if Linear MCP available
# Try to list assigned issues

If PM tool is GitHub:

gh issue list --assignee @me --limit 10 2>/dev/null

If PM tool is none: Skip task checking.

Step 7: Display Session Statistics (OpenTelemetry)

Run the OpenTelemetry session statistics script:

# Get the skill's base directory (passed via SKILL_BASE_DIR)
SKILL_DIR="${SKILL_BASE_DIR:-$HOME/.claude/plugins/marketplaces/jitd-marketplace/skills/nav-start}"
python3 "$SKILL_DIR/scripts/otel_session_stats.py"

This script:

  • If OTel enabled: Shows real-time metrics from Claude Code
    • Real token usage (input/output/cache)
    • Cache hit rate (CLAUDE.md caching performance)
    • Session cost (actual USD spent)
    • Active time (seconds of work)
    • Context availability
  • If OTel disabled: Shows setup instructions
  • If no metrics yet: Shows "waiting for export" message

Benefits of OTel integration:

  • Real data (not file-size estimates)
  • Cache performance validation
  • Cost tracking for ROI measurement
  • Official API (won't break on updates)

Step 8: Display Session Summary

Show this formatted summary:

╔══════════════════════════════════════════════════════╗
║                                                      ║
║  🚀 Navigator Session Started                             ║
║                                                      ║
╚══════════════════════════════════════════════════════╝

📖 Documentation Navigator: Loaded
🎯 Project Management: [PM tool or "Manual"]
✅ Token Optimization: Active

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

📊 DOCUMENTATION LOADED (MEASURED)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Navigator (.agent/DEVELOPMENT-README.md):
  Size: [nav_bytes] bytes = [nav_tokens] tokens

CLAUDE.md (auto-loaded):
  Size: [claude_bytes] bytes = [claude_tokens] tokens

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Total documentation:     [total_tokens] tokens
Available for work:      [available] tokens ([percent]%)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

💡 On-demand loading strategy:
   Load task doc when needed:  +3-5k tokens
   Load system doc if needed:  +4-6k tokens
   Load SOP if helpful:        +2-3k tokens

   Total with all docs:        ~[total + 15]k tokens

   vs Traditional (all upfront): ~150k tokens
   Savings: ~[150 - total - 15]k tokens

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

🔹 Navigator WORKFLOW REMINDER

1. Navigator-first loading
   - ✅ Loaded: .agent/DEVELOPMENT-README.md
   - Next: Load ONLY relevant task/system docs

2. Use agents for research
   - Multi-file searches: Use Task agent (saves 60-80% tokens)
   - Code exploration: Use Explore agent
   - NOT manual Read of many files

3. Task documentation
   - After features: Use nav-task-manager skill
   - After bugs: Use nav-sop-creator skill

4. Context management
   - Run nav-compact skill after isolated sub-tasks
   - Context markers save your progress

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[MULTI-CLAUDE WORKFLOWS CHECK - v4.3.0+]

Check if multi-Claude workflows installed:
```bash
if ! command -v navigator-multi-claude.sh &> /dev/null; then
  echo ""
  echo "⚡ Multi-Claude Workflows Available (v4.3.0+)"
  echo ""
  echo "   Enable parallel AI execution for complex tasks."
  echo "   Status: Not installed"
  echo ""
  echo "   Install: 'Install multi-Claude workflows'"
  echo "   Learn more: See RELEASE-NOTES-v4.3.0.md"
  echo ""
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
fi

Only show this prompt:

  • If plugin version >= 4.3.0
  • If scripts not installed
  • Once per session (set flag in memory)

Do NOT show if:

  • Scripts already installed
  • Plugin version < 4.3.0
  • User explicitly dismissed before

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

[If tasks found from PM tool, list them here]

[If no tasks found:] No active tasks found. What would you like to work on?


## Predefined Functions

### scripts/otel_session_stats.py

**Purpose**: Display real-time session statistics via OpenTelemetry

**When to call**: After loading navigator, before presenting session summary

**Requirements**:
- CLAUDE_CODE_ENABLE_TELEMETRY=1 (optional - shows setup if disabled)
- Metrics available from current session (shows waiting message if not)

**Execution**:
```bash
SKILL_DIR="${SKILL_BASE_DIR:-$HOME/.claude/plugins/marketplaces/jitd-marketplace/skills/nav-start}"
python3 "$SKILL_DIR/scripts/otel_session_stats.py"

Output: Formatted statistics with:

  • Token usage breakdown (input/output/cache)
  • Cache hit rate percentage
  • Session cost in USD
  • Active time
  • Context availability

Error Handling:

  • If OTel not enabled: Shows setup instructions
  • If no metrics yet: Shows "waiting for export" message
  • Never crashes - always displays helpful guidance

Reference Files

This skill uses:

  • otel_session_stats.py: Real-time session stats via OpenTelemetry
  • .agent/DEVELOPMENT-README.md: Navigator content
  • .agent/.nav-config.json: Configuration
  • .agent/.context-markers/.active: Active marker check

Error Handling

Navigator not found:

❌ Navigator not initialized

Run /nav:init to create .agent/ structure first.

PM tool configured but not working:

⚠️  [PM Tool] configured but not accessible

Check authentication or run setup guide.

Config file malformed:

⚠️  .agent/.nav-config.json is invalid JSON

Fix syntax or run /nav:init to regenerate.

Success Criteria

Session start is successful when:

  • Navigator loaded successfully
  • Token usage calculated and displayed
  • PM tool status checked (if configured)
  • User knows what to work on next
  • Navigator workflow context set

Notes

This skill provides the same functionality as /nav:start command but with:

  • Natural language invocation (no need to remember / syntax)
  • Auto-detection based on user intent
  • Composable with other Navigator skills

If user prefers manual invocation, they can still use /nav:start command (both work in hybrid mode).