Uses decimal numbering (72.1, 72.2, etc.) to preserve the logical sequence of planned phases while accommodating urgent insertions.

Purpose: Handle urgent work discovered during execution without renumbering entire roadmap. </objective>

<execution_context> @.planning/ROADMAP.md @.planning/STATE.md </execution_context>

Example: /kata-insert-phase 72 Fix critical auth bug → after = 72 → description = "Fix critical auth bug"

Validation:

if [ $# -lt 2 ]; then
  echo "ERROR: Both phase number and description required"
  echo "Usage: /kata-insert-phase <after> <description>"
  echo "Example: /kata-insert-phase 72 Fix critical auth bug"
  exit 1
fi

Parse first argument as integer:

after_phase=$1
shift
description="$*"

# Validate after_phase is an integer
if ! [[ "$after_phase" =~ ^[0-9]+$ ]]; then
  echo "ERROR: Phase number must be an integer"
  exit 1
fi

If ROADMAP.md exists, check format and auto-migrate if old:

if [ -f .planning/ROADMAP.md ]; then
  node scripts/kata-lib.cjs check-roadmap 2>/dev/null
  FORMAT_EXIT=$?
  
  if [ $FORMAT_EXIT -eq 1 ]; then
    echo "Old roadmap format detected. Running auto-migration..."
  fi
fi

If exit code 1 (old format):

Invoke kata-doctor in auto mode:

Skill("kata-doctor", "--auto")

Continue after migration completes.

If exit code 0 or 2: Continue silently. </step>

if [ -f .planning/ROADMAP.md ]; then
  ROADMAP=".planning/ROADMAP.md"
else
  echo "ERROR: No roadmap found (.planning/ROADMAP.md)"
  exit 1
fi

Read roadmap content for parsing. </step>

1. Search for "### Phase {after_phase}:" heading

2. If not found:

   ERROR: Phase {after_phase} not found in roadmap
   Available phases: [list phase numbers]
   

   Exit.

3. Verify phase is in current milestone (not completed/archived) </step>

1. Search for all "### Phase {after_phase}.N:" headings
2. Extract decimal suffixes (e.g., for Phase 72: find 72.1, 72.2, 72.3)
3. Find the highest decimal suffix
4. Calculate next decimal: max + 1

Examples:

• Phase 72 with no decimals → next is 72.1
• Phase 72 with 72.1 → next is 72.2
• Phase 72 with 72.1, 72.2 → next is 72.3

Store as: decimal_phase="$(printf "%02d" $after_phase).${next_decimal}" </step>

slug=$(echo "$description" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | sed 's/^-//;s/-$//')

Phase directory name: {decimal-phase}-{slug} Example: 06.1-fix-critical-auth-bug (phase 6 insertion) </step>

phase_dir=".planning/phases/pending/${decimal_phase}-${slug}"
mkdir -p "$phase_dir"

Confirm: "Created directory: $phase_dir" </step>

1. Find insertion point: immediately after Phase {after_phase}'s content (before next phase heading or "---")

2. Insert new phase heading with (INSERTED) marker:

   ### Phase {decimal_phase}: {Description} (INSERTED)
   
   **Goal:** [Urgent work - to be planned]
   **Depends on:** Phase {after_phase}
   **Plans:** 0 plans
   
   Plans:
   - [ ] TBD (run /kata-plan-phase {decimal_phase} to break down)
   
   **Details:**
   [To be added during planning]
   

3. Write updated roadmap back to file

The "(INSERTED)" marker helps identify decimal phases as urgent insertions.

Preserve all other content exactly (formatting, spacing, other phases). </step>

1. Read .planning/STATE.md
2. Under "## Accumulated Context" → "### Roadmap Evolution" add entry:

   - Phase {decimal_phase} inserted after Phase {after_phase}: {description} (URGENT)
   

If "Roadmap Evolution" section doesn't exist, create it.

Add note about insertion reason if appropriate. </step>

Phase {decimal_phase} inserted after Phase {after_phase}:
- Description: {description}
- Directory: .planning/phases/{decimal-phase}-{slug}/
- Status: Not planned yet
- Marker: (INSERTED) - indicates urgent work

Roadmap updated: {roadmap-path}
Project state updated: .planning/STATE.md

---

## ▶ Next Up

**Phase {decimal_phase}: {description}** — urgent insertion

`/kata-plan-phase {decimal_phase}`

<sub>`/clear` first → fresh context window</sub>

---

**Also available:**
- Review insertion impact: Check if Phase {next_integer} dependencies still make sense
- Review roadmap

---

<anti_patterns>

• Don't use this for planned work at end of milestone (use /kata-add-phase)
• Don't insert before Phase 1 (decimal 0.1 makes no sense)
• Don't renumber existing phases
• Don't modify the target phase content
• Don't create plans yet (that's /kata-plan-phase)
• Don't commit changes (user decides when to commit) </anti_patterns>

<success_criteria> Phase insertion is complete when:

• Phase directory created: .planning/phases/pending/{N.M}-{slug}/
• Roadmap updated with new phase entry (includes "(INSERTED)" marker)
• Phase inserted in correct position (after target phase, before next integer phase)
• STATE.md updated with roadmap evolution note
• Decimal number calculated correctly (based on existing decimals)
• User informed of next steps and dependency implications </success_criteria>