---
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
---

# 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 0: Detect SessionStart Hook Injection (Fast Path) [v6.9.0+]

**Before doing anything else**, check whether the SessionStart hook has already
injected Navigator context into this session. The hook emits a sentinel string
on success:

```
<!-- nav-session-start-injected:v1 -->
```

**If the sentinel is present in your system context** (it appears inside a
SessionStart system reminder block at the very top of the conversation):

→ **Fast path activated**. Do NOT execute Steps 1–7. The data those steps
  would Read is already in your context window. Skip directly to **Step 8
  (Display Session Summary)** and render it using the injected data.

  This eliminates ~6 Read tool invocations per session start and saves
  ~1.5-2k tokens of tool-call ceremony. The user-visible output must be
  **byte-identical** to the legacy path — they should not be able to tell
  which mode produced it.

**If the sentinel is absent** (legacy project without the hook, hook disabled
in `.agent/.nav-config.json`, or hook crashed):

→ **Legacy path**. Execute Steps 1–7 as documented below. Same behavior as
  pre-v6.9.0.

**Detection rule of thumb**: If you can read the string `nav-session-start-injected`
anywhere in the system reminders that opened this conversation, you are on the
fast path.

---

### Step 1: Check Navigator Version

Check if user is running latest Navigator version:

```bash
# Run version checker (optional - doesn't block session start)
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
if [ -f "$PLUGIN_DIR/scripts/check-version.sh" ]; then
  bash "$PLUGIN_DIR/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 1.5: Auto-Update (if enabled)

Run exactly this one command. It reads `auto_update` from the project config, checks the
latest release, and updates the plugin only when one is available. It prints one JSON object.

```bash
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
python3 "$PLUGIN_DIR/skills/nav-start/functions/auto_updater.py"
```

Report **only** what that JSON says. Never write an update line from memory or a template:

- `"status": "updated"` → `✅ Navigator updated from <current_version> to <new_version>. Restart
  Claude Code to load it.` (values copied from the JSON)
- `"status": "failed"` → `⚠️ <message>. Update by hand: claude plugin update navigator@navigator-marketplace`
- `"up-to-date"`, `"disabled"`, `"skipped"`, or the command did not run → say nothing about updates

Since v8 the Navigator mod also shows a read-only toast at session start when a newer release
exists (TASK-81). It never updates by itself; this step and `claude plugin update` do.

**Never block session start** because of this step.

### Step 2: Check Navigator Initialization

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

```bash
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`:

```bash
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)
- `tom_features`: ToM configuration (if present, v5.0.0+)

### Step 5.1: Check Version Drift

**Check if project config version matches plugin version**:

```bash
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
DRIFT_RESULT=$(python3 "$PLUGIN_DIR/skills/nav-start/functions/auto_updater.py" --check-drift 2>/dev/null || echo '{"has_drift": false}')
HAS_DRIFT=$(echo "$DRIFT_RESULT" | python3 -c "import sys,json; print(json.load(sys.stdin).get('has_drift', False))" 2>/dev/null)

if [ "$HAS_DRIFT" = "True" ]; then
  DRIFT_MSG=$(echo "$DRIFT_RESULT" | python3 -c "import sys,json; print(json.load(sys.stdin).get('message', ''))" 2>/dev/null)
  echo ""
  echo "⚠️  VERSION DRIFT DETECTED"
  echo "   $DRIFT_MSG"
  echo ""
fi
```

**Version drift occurs when**:
- Plugin updated but project config wasn't synced
- Manual plugin install without running nav-upgrade
- Project cloned with old config version

**Display warning if drift detected**:
```
⚠️  VERSION DRIFT DETECTED
   Project config (v5.5.0) behind plugin (v5.7.0). Run "update my CLAUDE.md" to sync.
```

This helps users understand why skills may behave unexpectedly.

### Step 5.5: Load Knowledge Graph (v6.0.0+) [EXECUTE]

**Check if knowledge graph exists and is enabled**:
```bash
if [ -f ".agent/knowledge/graph.json" ]; then
  # Get graph stats
  PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
  [ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
  GRAPH_STATS=$(python3 "$PLUGIN_DIR/skills/nav-graph/functions/graph_manager.py" --action stats --graph-path .agent/knowledge/graph.json 2>/dev/null)
  echo "$GRAPH_STATS"
fi
```

**Display graph summary in session output**:
```
📚 Knowledge Graph: Active
   Nodes: {total_nodes} | Memories: {memory_count}
   Concepts: {concept_count} indexed
```

**Surface relevant memories** (v6.17.0+: injected automatically):
The SessionStart hook now enforces `auto_surface_relevant` — when the
sentinel is present (fast path), a `## Relevant Memories` block is already
in your context, produced by `memory_recall.py --auto` (concepts from open
task nodes + active marker, resolved memories excluded). Render it as:
```
💡 Relevant Memories:
   - PITFALL: "Auth changes often break session tests" (90%)
   - PATTERN: "Always run unit tests before integration" (85%)
```
**Legacy path only** (sentinel absent): run the recall CLI manually:
```bash
python3 "$PLUGIN_DIR/skills/nav-graph/functions/memory_recall.py" \
  --auto --agent-dir .agent --graph-path .agent/knowledge/graph.json \
  --limit 5 --format compact
```
Empty output → omit the block. Disable via
`knowledge_graph.auto_surface_relevant: false` in `.agent/.nav-config.json`
(`max_session_memories` caps the count).

**If graph doesn't exist**:
```
📚 Knowledge Graph: Not initialized
   Run "Initialize knowledge graph" to enable
```

### Step 5.6: Load User Profile (ToM - Bilateral Modeling) [EXECUTE]

**IMPORTANT**: This step MUST be executed, not just documented.

**Check if user profile exists**:
```bash
if [ -f ".agent/.user-profile.json" ]; then
  echo "📋 User profile found"
else
  echo "No user profile. Using defaults."
fi
```

**If profile exists, READ IT NOW**:
```
Read(
  file_path: ".agent/.user-profile.json"
)
```

**After reading, APPLY these preferences for the session**:

1. **Verbosity** (`preferences.communication.verbosity`):
   - `concise`: Keep responses brief, code-first
   - `balanced`: Normal explanations (default)
   - `detailed`: Thorough explanations with context

2. **Confirmation threshold** (`preferences.communication.confirmation_threshold`):
   - `always`: Show verification checkpoints for all skills
   - `high-stakes`: Only for backend-endpoint, database-migration, frontend-component (default)
   - `never`: Skip verification checkpoints

3. **Frameworks** (`preferences.technical.preferred_frameworks`):
   - Remember for code generation suggestions
   - E.g., ["react", "express"] → prefer these in examples

4. **Corrections** (`corrections[]`):
   - Review recent patterns to avoid repeating mistakes
   - E.g., "REST endpoints use plural nouns" → apply immediately

**Display profile summary in session output**:
```
🧠 Theory of Mind: Active
   Profile: Loaded ({corrections_count} corrections, {goals_count} goals)
   Verbosity: {verbosity}
   Checkpoints: {confirmation_threshold}
```

**If profile doesn't exist**:
```
🧠 Theory of Mind: Active (no profile yet)
   Say "save my preferences" to create one
```

### Step 6: Check PM Tool for Assigned Tasks

**If PM tool is Linear**:
```bash
# Check if Linear MCP available
# Try to list assigned issues
```

**If PM tool is GitHub**:
```bash
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:

```bash
# Resolve the installed plugin directory
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
python3 "$PLUGIN_DIR/skills/nav-start/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 the Navigator ASCII logo and session summary.

**Display the logo using these exact ANSI color codes**:

```bash
# Colors: Blue N, Red A, Blue V (Navigator arrow)
BLUE='\033[1;34m'
RED='\033[1;31m'
WHITE='\033[1;37m'
GRAY='\033[90m'
NC='\033[0m'

printf "${BLUE}███╗   ██╗${NC} ${RED} █████╗ ${NC}${BLUE}██╗   ██╗${NC}\n"
printf "${BLUE}████╗  ██║${NC} ${RED}██╔══██╗${NC}${BLUE}██║   ██║${NC}\n"
printf "${BLUE}██╔██╗ ██║${NC} ${RED}███████║${NC}${BLUE}██║   ██║${NC}  ${WHITE}v6.0.0${NC}\n"
printf "${BLUE}██║╚██╗██║${NC} ${RED}██╔══██║${NC}${BLUE}╚██╗ ██╔╝${NC}  ${GRAY}Knowledge Graph${NC}\n"
printf "${BLUE}██║ ╚████║${NC} ${RED}██║  ██║${NC}${BLUE} ╚████╔╝ ${NC}\n"
printf "${BLUE}╚═╝  ╚═══╝${NC} ${RED}╚═╝  ╚═╝${NC}${BLUE}  ╚═══╝  ${NC}\n"
```

**Then show the session info**:

```
📖 Navigator: Loaded
🎯 PM: [PM tool or "Manual"]
✅ Optimization: Active
🧠 ToM: [Profile status from Step 5.6]
📚 Graph: [Knowledge graph status from Step 5.5]

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

📊 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

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

🔹 WORKFLOW ENFORCEMENT (MANDATORY)

Before responding to ANY task, show:
┌─────────────────────────────────────┐
│ WORKFLOW CHECK                      │
├─────────────────────────────────────┤
│ Loop trigger: [YES/NO]              │
│ Complexity: [0.X]                   │
│ Mode: [LOOP/TASK/DIRECT]            │
└─────────────────────────────────────┘

Loop triggers: "run until done", "do all", "keep going"
Task triggers: multi-file, refactor, new feature
Skipping this check = WORKFLOW VIOLATION

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

🔹 Navigator WORKFLOW REMINDER

1. Workflow enforcement
   - ✅ ALWAYS show WORKFLOW CHECK on tasks
   - Loop Mode: NAVIGATOR_STATUS each iteration
   - Task Mode: Phase tracking (RESEARCH→COMPLETE)

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

3. Use agents for research
   - Multi-file searches: Use Task agent (saves 60-80% tokens)
   - Code exploration: Use Explore agent

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

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

[FIRST SESSION FEATURES DISPLAY - v5.6.0+]

Check if this is first session after install/update:

```bash
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
FIRST_SESSION_MARKER=".agent/.features-shown-$(cat .agent/.nav-config.json | python3 -c "import sys,json; print(json.load(sys.stdin).get('version',''))" 2>/dev/null)"

if [ ! -f "$FIRST_SESSION_MARKER" ]; then
  echo ""
  python3 "$PLUGIN_DIR/skills/nav-features/functions/feature_manager.py" show --first-session
  echo ""
  echo "💡 Toggle features: 'show my features' or 'disable loop_mode'"
  echo ""
  touch "$FIRST_SESSION_MARKER"
fi
```

Shows feature table on:
- First session after Navigator install
- First session after version update (new version = new marker)

Do NOT show if:
- Features already shown for this version
- feature_manager.py not found (older plugin)

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

[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
PLUGIN_DIR="${CLAUDE_PLUGIN_ROOT:-$(cat "${NAVIGATOR_CONFIG_HOME:-${XDG_CONFIG_HOME:-$HOME/.config}/navigator}/plugin-root" 2>/dev/null)}"
[ -d "$PLUGIN_DIR/skills" ] || PLUGIN_DIR="$HOME/.claude/plugins/marketplaces/navigator-marketplace"
python3 "$PLUGIN_DIR/skills/nav-start/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

**Fast-path source** (v6.9.0+): the SessionStart op at
`hooks/ops/session_start.py` (dispatched by `hooks/nav_dispatch.py` from the
plugin manifest) pre-loads all of the above into the session before the
skill runs.

## 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).