# Flow-to-Library Step Sync Implementation Plan

> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.

**Goal:** When a flow is published, extract its steps (procedure_steps from procedural/maintenance flows; action/solution nodes from troubleshooting flows) and upsert them into the `step_library` table, keeping them in sync on subsequent publishes, and showing a "From Flow" read-only indicator in the library browser.

**Architecture:** New migration adds 4 columns to `step_library` + a unique constraint on `(source_tree_id, source_node_id)`. A new `backend/app/core/step_sync.py` module handles all extraction and upsert logic. The `update_tree` endpoint calls `sync_steps_from_tree()` after a successful publish. Frontend adds `is_flow_synced` + `source_tree_name` to the Step type, a read-only lock in `StepCard`, and a "Library Visibility" select in `StepEditor`.

**Tech Stack:** Python FastAPI, SQLAlchemy 2.0 async, PostgreSQL JSONB, Alembic, React 19 + TypeScript + Tailwind CSS.

---

## Codebase Context

- **Publish endpoint:** `backend/app/api/endpoints/trees.py:546` — `update_tree()`. Publish validation at line 587. Version increment at line 639. Step sync should be inserted after line 641 (after version increment, before tag replacement at line 643).
- **Step library model:** `backend/app/models/step_library.py` — `StepLibrary` table, 20 cols. No `source_tree_id` yet.
- **Step schemas:** `backend/app/schemas/step_library.py` — `StepContent` (lines 15–19), `StepLibraryResponse` (lines 45–64). No `is_flow_synced` yet.
- **Frontend Step type:** `frontend/src/types/step.ts:15` — `Step` interface. No `is_flow_synced` yet.
- **StepCard:** `frontend/src/components/step-library/StepCard.tsx` — ownership check via `isOwn = step.created_by === currentUserId`.
- **StepEditor More Options:** `frontend/src/components/procedural-editor/StepEditor.tsx:138` — `{showMore && <div>}` block inside the More Options section.
- **Fixtures:** `client`, `test_db`, `test_user`, `auth_headers`, `test_tree`, `test_admin`, `admin_auth_headers` from `backend/tests/conftest.py`.
- **Next migration:** base off `e65b9f8fd458_add_feedback_table.py`.
- **Test runner:** `cd backend && backend/venv/bin/python -m pytest tests/test_step_sync.py -v --override-ini="addopts="`

---

### Task 1: Database migration — add sync columns to `step_library`

**Files:**
- Create: `backend/alembic/versions/030_add_step_library_sync_fields.py`

**Step 1: Create the migration file manually (do NOT use autogenerate)**

```bash
cd /home/michaelchihlas/dev/patherly/backend
alembic revision -m "add_step_library_sync_fields"
```

This creates a new file in `backend/alembic/versions/`. Open it and replace the `upgrade()` and `downgrade()` bodies with:

```python
def upgrade() -> None:
    op.add_column('step_library', sa.Column('source_tree_id', sa.UUID(), nullable=True))
    op.add_column('step_library', sa.Column('source_node_id', sa.String(255), nullable=True))
    op.add_column('step_library', sa.Column('is_flow_synced', sa.Boolean(), nullable=False, server_default='false'))
    op.add_column('step_library', sa.Column('last_synced_at', sa.DateTime(timezone=True), nullable=True))
    op.create_foreign_key(
        'fk_step_library_source_tree',
        'step_library', 'trees',
        ['source_tree_id'], ['id'],
        ondelete='SET NULL'
    )
    op.create_unique_constraint(
        'uq_step_library_source_node',
        'step_library',
        ['source_tree_id', 'source_node_id']
    )
    op.create_index('ix_step_library_source_tree_id', 'step_library', ['source_tree_id'])

def downgrade() -> None:
    op.drop_index('ix_step_library_source_tree_id', 'step_library')
    op.drop_constraint('uq_step_library_source_node', 'step_library', type_='unique')
    op.drop_constraint('fk_step_library_source_tree', 'step_library', type_='foreignkey')
    op.drop_column('step_library', 'last_synced_at')
    op.drop_column('step_library', 'is_flow_synced')
    op.drop_column('step_library', 'source_node_id')
    op.drop_column('step_library', 'source_tree_id')
```

**Step 2: Run the migration**

```bash
cd /home/michaelchihlas/dev/patherly/backend
alembic upgrade head
```

Expected: `Running upgrade ... -> <new_revision>, add_step_library_sync_fields`

**Step 3: Verify the columns exist**

```bash
docker exec -it patherly_postgres psql -U postgres -d patherly -c "\d step_library" | grep -E "source_|is_flow|last_sync"
```

Expected: 4 new columns listed.

**Step 4: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add backend/alembic/versions/
git commit -m "feat: add sync tracking columns to step_library

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 2: Update `StepLibrary` model with new columns

**Files:**
- Modify: `backend/app/models/step_library.py`

**Step 1: Read the file to find the exact insertion point**

Read `backend/app/models/step_library.py` — find the `is_active` column (last column before relationships). Add the 4 new columns after `is_active`:

```python
# Sync tracking (flow-sourced steps)
source_tree_id: Mapped[Optional[uuid_pkg.UUID]] = mapped_column(
    UUID(as_uuid=True),
    ForeignKey('trees.id', ondelete='SET NULL'),
    nullable=True,
    index=True
)
source_node_id: Mapped[Optional[str]] = mapped_column(String(255), nullable=True)
is_flow_synced: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
last_synced_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
```

**Step 2: Add the `source_tree` relationship**

In the relationships section of `StepLibrary`, add after the existing `account` relationship:

```python
source_tree: Mapped[Optional["Tree"]] = relationship(
    "Tree",
    foreign_keys=[source_tree_id],
    lazy="select"
)
```

**Step 3: Verify imports**

The file already imports `Optional`, `UUID`, `Boolean`, `String`, `DateTime`, `ForeignKey`, `relationship`. Confirm `mapped_column` and `Mapped` are imported. No new imports should be needed.

**Step 4: Run the backend to check for import errors**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -c "from app.models.step_library import StepLibrary; print('OK')"
```

Expected: `OK`

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add backend/app/models/step_library.py
git commit -m "feat: add sync columns and source_tree relationship to StepLibrary model

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 3: Update schemas and add `group_label` to `StepContent`

**Files:**
- Modify: `backend/app/schemas/step_library.py`

**Step 1: Add `group_label` to `StepContent`**

Find `StepContent` (lines 15–19) and add `group_label`:

```python
class StepContent(BaseModel):
    instructions: str = Field(..., min_length=1)
    help_text: Optional[str] = None
    commands: Optional[list[StepCommand]] = None
    group_label: Optional[str] = None  # Section header this step belongs to (for flow-synced steps)
```

**Step 2: Add `is_flow_synced` and `source_tree_name` to `StepLibraryResponse`**

Find `StepLibraryResponse` (lines 45–64) and add two fields at the end:

```python
    is_flow_synced: bool = False
    source_tree_name: Optional[str] = None
```

**Step 3: Verify import — `Optional` is already imported from typing**

Read the top of the file to confirm. No new imports needed.

**Step 4: Verify Python import**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -c "from app.schemas.step_library import StepLibraryResponse, StepContent; print('OK')"
```

Expected: `OK`

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add backend/app/schemas/step_library.py
git commit -m "feat: add group_label to StepContent, is_flow_synced to StepLibraryResponse

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 4: Update step list endpoint to return `is_flow_synced` and `source_tree_name`

**Files:**
- Modify: `backend/app/api/endpoints/steps.py`

The list endpoint currently returns `StepLibraryResponse` objects built from ORM instances. We need to populate `is_flow_synced` and `source_tree_name`.

**Step 1: Read `backend/app/api/endpoints/steps.py` lines 58–139**

Find where the list query is executed and where response objects are built. Look for the SELECT statement and how it maps to `StepLibraryResponse`.

**Step 2: Add `source_tree_name` to the list query via a join**

The list query will need to LEFT JOIN trees to get the name. Find the existing query and add:

```python
from app.models.tree import Tree as TreeModel

# In the list query, add a join:
query = (
    select(
        StepLibrary,
        TreeModel.name.label('source_tree_name')
    )
    .outerjoin(TreeModel, StepLibrary.source_tree_id == TreeModel.id)
    # ... existing filters ...
)
```

Then when building the response, pass `source_tree_name` from the joined result.

**Important:** Read the existing query structure carefully before modifying — match whatever pattern (scalar results, row mapping, etc.) is already used.

**Step 3: Also update the single-step GET endpoint** (lines 221–265) to include `source_tree_name` in the same way.

**Step 4: Verify Python import**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -c "from app.api.endpoints.steps import router; print('OK')"
```

Expected: `OK`

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add backend/app/api/endpoints/steps.py
git commit -m "feat: include is_flow_synced and source_tree_name in step list/detail responses

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 5: Create `backend/app/core/step_sync.py`

**Files:**
- Create: `backend/app/core/step_sync.py`
- Test: `backend/tests/test_step_sync.py`

This is the core of the feature. Write the test first.

**Step 1: Write the failing tests**

Create `backend/tests/test_step_sync.py`:

```python
"""Tests for flow-to-library step sync."""
import pytest
from uuid import uuid4
from app.core.step_sync import extract_steps_for_sync, resolve_step_visibility


class TestResolveStepVisibility:
    """Test visibility resolution logic."""

    def test_public_flow_gives_public_steps(self):
        result = resolve_step_visibility(is_public=True, account_id=None, node_override=None)
        assert result == 'public'

    def test_team_flow_gives_team_steps(self):
        result = resolve_step_visibility(is_public=False, account_id=uuid4(), node_override=None)
        assert result == 'team'

    def test_private_flow_gives_team_steps(self):
        result = resolve_step_visibility(is_public=False, account_id=None, node_override=None)
        assert result == 'team'

    def test_node_override_takes_precedence(self):
        result = resolve_step_visibility(is_public=True, account_id=None, node_override='team')
        assert result == 'team'

    def test_public_override_on_team_flow(self):
        result = resolve_step_visibility(is_public=False, account_id=uuid4(), node_override='public')
        assert result == 'public'


class TestExtractStepsForSync:
    """Test step extraction from tree structures."""

    def test_extracts_procedure_steps_from_procedural_flow(self):
        tree_structure = {
            "steps": [
                {"id": "step_1", "type": "procedure_step", "title": "Verify prerequisites",
                 "description": "Check all prereqs", "content_type": "action"},
                {"id": "end_1", "type": "procedure_end", "title": "Done"},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        assert len(results) == 1
        assert results[0]['source_node_id'] == 'step_1'
        assert results[0]['title'] == 'Verify prerequisites'
        assert results[0]['step_type'] == 'action'
        assert results[0]['content']['instructions'] == 'Check all prereqs'

    def test_skips_section_header_nodes(self):
        tree_structure = {
            "steps": [
                {"id": "sec_1", "type": "section_header", "title": "Phase 1"},
                {"id": "step_1", "type": "procedure_step", "title": "First step",
                 "description": "Do this"},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        assert len(results) == 1
        assert results[0]['source_node_id'] == 'step_1'

    def test_captures_section_header_as_group_label(self):
        tree_structure = {
            "steps": [
                {"id": "sec_1", "type": "section_header", "title": "Cable Checks"},
                {"id": "step_1", "type": "procedure_step", "title": "Check cable",
                 "description": "Verify cable is seated"},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        assert results[0]['content']['group_label'] == 'Cable Checks'

    def test_normalizes_string_commands(self):
        tree_structure = {
            "steps": [
                {"id": "step_1", "type": "procedure_step", "title": "Run command",
                 "description": "Execute this", "commands": "ping 8.8.8.8"},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        assert results[0]['content']['commands'] == [{"label": "", "command": "ping 8.8.8.8", "command_type": None}]

    def test_normalizes_commandblock_commands(self):
        tree_structure = {
            "steps": [
                {"id": "step_1", "type": "procedure_step", "title": "Run PS",
                 "description": "Run powershell",
                 "commands": [{"code": "Get-Service", "language": "powershell", "label": "Check services"}]},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        cmds = results[0]['content']['commands']
        assert len(cmds) == 1
        assert cmds[0]['command'] == 'Get-Service'
        assert cmds[0]['command_type'] == 'powershell'
        assert cmds[0]['label'] == 'Check services'

    def test_extracts_action_and_solution_from_troubleshooting(self):
        tree_structure = {
            "id": "root",
            "type": "decision",
            "question": "What is wrong?",
            "options": [{"id": "o1", "label": "Thing A", "next_node_id": "act_1"}],
            "children": [
                {"id": "act_1", "type": "action", "title": "Fix thing A",
                 "description": "Do the fix", "next_node_id": "sol_1",
                 "children": [{"id": "sol_1", "type": "solution", "title": "All fixed",
                               "description": "Problem resolved"}]},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='troubleshooting'))
        node_ids = {r['source_node_id'] for r in results}
        assert 'act_1' in node_ids
        assert 'sol_1' in node_ids
        types = {r['source_node_id']: r['step_type'] for r in results}
        assert types['act_1'] == 'action'
        assert types['sol_1'] == 'solution'

    def test_uses_title_as_instructions_fallback(self):
        tree_structure = {
            "steps": [
                {"id": "step_1", "type": "procedure_step", "title": "Do the thing"},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        assert results[0]['content']['instructions'] == 'Do the thing'

    def test_empty_steps_list(self):
        tree_structure = {"steps": []}
        results = list(extract_steps_for_sync(tree_structure, tree_type='procedural'))
        assert results == []

    def test_maintenance_treated_same_as_procedural(self):
        tree_structure = {
            "steps": [
                {"id": "step_1", "type": "procedure_step", "title": "Maintenance step",
                 "description": "Do maintenance"},
            ]
        }
        results = list(extract_steps_for_sync(tree_structure, tree_type='maintenance'))
        assert len(results) == 1
```

**Step 2: Run tests to verify they fail**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -m pytest tests/test_step_sync.py -v --override-ini="addopts="
```

Expected: FAIL — `ImportError: cannot import name 'extract_steps_for_sync'`

**Step 3: Implement `backend/app/core/step_sync.py`**

```python
"""Sync steps from published flows into the step library."""
from __future__ import annotations
from typing import Any, Generator, Literal, Optional
from uuid import UUID, uuid4
from datetime import datetime, timezone

from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession


StepVisibility = Literal['private', 'team', 'public']


def resolve_step_visibility(
    is_public: bool,
    account_id: Optional[UUID],
    node_override: Optional[str],
) -> StepVisibility:
    """Resolve the visibility for a synced step.

    Priority: node-level library_visibility > flow visibility.
    Flow visibility: public if is_public, otherwise 'team'.
    """
    if node_override in ('team', 'public'):
        return node_override  # type: ignore[return-value]
    return 'public' if is_public else 'team'


def _normalize_commands(raw: Any) -> list[dict]:
    """Normalize command field to list of StepCommand dicts."""
    if not raw:
        return []
    if isinstance(raw, str):
        return [{"label": "", "command": raw, "command_type": None}]
    if isinstance(raw, list):
        result = []
        for item in raw:
            if isinstance(item, str):
                result.append({"label": "", "command": item, "command_type": None})
            elif isinstance(item, dict):
                result.append({
                    "label": item.get("label", ""),
                    "command": item.get("code", item.get("command", "")),
                    "command_type": item.get("language", item.get("command_type")),
                })
        return result
    return []


def _walk_troubleshooting(node: dict) -> Generator[dict, None, None]:
    """Recursively yield action and solution nodes from a troubleshooting tree."""
    node_type = node.get("type")
    if node_type in ("action", "solution"):
        yield node
    for child in node.get("children", []):
        yield from _walk_troubleshooting(child)


def extract_steps_for_sync(
    tree_structure: dict,
    tree_type: str,
) -> Generator[dict, None, None]:
    """Extract step dicts ready for upsert from a tree structure.

    Yields dicts with keys:
      source_node_id, title, step_type, content (dict), node_visibility_override
    """
    if tree_type in ("procedural", "maintenance"):
        steps = tree_structure.get("steps", [])
        current_section: Optional[str] = None
        for node in steps:
            node_type = node.get("type")
            if node_type == "section_header":
                current_section = node.get("title") or node.get("section_header")
                continue
            if node_type != "procedure_step":
                continue
            description = node.get("description") or node.get("title", "")
            content: dict = {
                "instructions": description,
                "help_text": node.get("expected_outcome"),
                "commands": _normalize_commands(node.get("commands")) or None,
                "group_label": current_section,
            }
            # Remove None values for cleanliness
            content = {k: v for k, v in content.items() if v is not None}
            # instructions is required — ensure it's present
            content.setdefault("instructions", node.get("title", ""))
            yield {
                "source_node_id": node["id"],
                "title": node.get("title", "Untitled step"),
                "step_type": "action",
                "content": content,
                "node_visibility_override": node.get("library_visibility"),
            }

    elif tree_type == "troubleshooting":
        for node in _walk_troubleshooting(tree_structure):
            description = node.get("description") or node.get("title", "")
            content = {
                "instructions": description,
            }
            yield {
                "source_node_id": node["id"],
                "title": node.get("title", "Untitled step"),
                "step_type": "action" if node["type"] == "action" else "solution",
                "content": content,
                "node_visibility_override": None,
            }


async def sync_steps_from_tree(
    db: AsyncSession,
    tree_id: UUID,
    tree_type: str,
    tree_structure: dict,
    author_id: UUID,
    account_id: Optional[UUID],
    is_public: bool,
) -> int:
    """Upsert step library entries from a published tree.

    Returns the number of steps synced.
    """
    from app.models.step_library import StepLibrary  # avoid circular import

    count = 0
    now = datetime.now(timezone.utc)

    for step_data in extract_steps_for_sync(tree_structure, tree_type):
        visibility = resolve_step_visibility(
            is_public=is_public,
            account_id=account_id,
            node_override=step_data["node_visibility_override"],
        )

        # Use raw SQL upsert keyed on (source_tree_id, source_node_id)
        await db.execute(
            text("""
                INSERT INTO step_library (
                    id, title, step_type, content, created_by, account_id,
                    visibility, is_flow_synced, source_tree_id, source_node_id,
                    last_synced_at, tags, is_active,
                    usage_count, rating_average, rating_count,
                    helpful_yes, helpful_no, is_featured, is_verified,
                    created_at, updated_at
                ) VALUES (
                    gen_random_uuid(), :title, :step_type, :content::jsonb,
                    :created_by, :account_id, :visibility, true,
                    :source_tree_id, :source_node_id, :last_synced_at,
                    '{}', true,
                    0, 0, 0, 0, 0, false, false,
                    :now, :now
                )
                ON CONFLICT (source_tree_id, source_node_id)
                DO UPDATE SET
                    title = EXCLUDED.title,
                    step_type = EXCLUDED.step_type,
                    content = EXCLUDED.content,
                    visibility = EXCLUDED.visibility,
                    last_synced_at = EXCLUDED.last_synced_at,
                    updated_at = EXCLUDED.updated_at,
                    is_active = true
            """),
            {
                "title": step_data["title"],
                "step_type": step_data["step_type"],
                "content": __import__('json').dumps(step_data["content"]),
                "created_by": str(author_id),
                "account_id": str(account_id) if account_id else None,
                "visibility": visibility,
                "source_tree_id": str(tree_id),
                "source_node_id": step_data["source_node_id"],
                "last_synced_at": now,
                "now": now,
            }
        )
        count += 1

    # Soft-delete any previously synced steps for this tree that no longer exist
    current_node_ids = [
        s["source_node_id"]
        for s in extract_steps_for_sync(tree_structure, tree_type)
    ]
    if current_node_ids:
        await db.execute(
            text("""
                UPDATE step_library
                SET is_active = false, updated_at = :now
                WHERE source_tree_id = :tree_id
                  AND is_flow_synced = true
                  AND source_node_id NOT IN :node_ids
            """),
            {"tree_id": str(tree_id), "node_ids": tuple(current_node_ids), "now": now}
        )
    else:
        # No steps extracted — deactivate all synced entries for this tree
        await db.execute(
            text("""
                UPDATE step_library
                SET is_active = false, updated_at = :now
                WHERE source_tree_id = :tree_id AND is_flow_synced = true
            """),
            {"tree_id": str(tree_id), "now": now}
        )

    return count


async def deactivate_synced_steps_for_tree(db: AsyncSession, tree_id: UUID) -> None:
    """Soft-delete all synced library entries for a tree (called on tree delete/deactivate)."""
    await db.execute(
        text("""
            UPDATE step_library
            SET is_active = false, updated_at = :now
            WHERE source_tree_id = :tree_id AND is_flow_synced = true
        """),
        {"tree_id": str(tree_id), "now": datetime.now(timezone.utc)}
    )
```

**Step 4: Run tests**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -m pytest tests/test_step_sync.py -v --override-ini="addopts="
```

Expected: All tests PASS.

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add backend/app/core/step_sync.py backend/tests/test_step_sync.py
git commit -m "feat: add step_sync module with extraction and upsert logic

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 6: Wire sync into the publish endpoint

**Files:**
- Modify: `backend/app/api/endpoints/trees.py`

**Step 1: Read lines 583–650 of the file to confirm exact positions**

Confirm line numbers for:
- The `if "status" in update_data and update_data["status"] == 'published':` block
- The version increment at `tree.version += 1`
- The tag replacement block that follows

**Step 2: Add the import at the top of the file**

Near the other core imports (grep for `from app.core`), add:

```python
from app.core.step_sync import sync_steps_from_tree, deactivate_synced_steps_for_tree
```

**Step 3: Insert sync call after version increment**

After `tree.version += 1` (line ~641) and before the tag replacement block, add:

```python
            # Sync steps to library when publishing
            if update_data.get("status") == 'published' or tree.status == 'published':
                final_structure = update_data.get("tree_structure", tree.tree_structure)
                final_type = update_data.get("tree_type", tree.tree_type)
                await sync_steps_from_tree(
                    db=db,
                    tree_id=tree.id,
                    tree_type=final_type,
                    tree_structure=final_structure,
                    author_id=tree.author_id,
                    account_id=tree.account_id,
                    is_public=update_data.get("is_public", tree.is_public),
                )
```

**Step 4: Add deactivation on tree delete**

Find the delete tree endpoint (search for `@router.delete`). After confirming the tree is being deleted, add before commit:

```python
await deactivate_synced_steps_for_tree(db, tree_id)
```

**Step 5: Verify Python import**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -c "from app.api.endpoints.trees import router; print('OK')"
```

Expected: `OK`

**Step 6: Write integration test**

Add to `backend/tests/test_step_sync.py` a new class:

```python
class TestSyncOnPublish:
    """Integration tests — sync triggered by publishing a tree."""

    @pytest.mark.asyncio
    async def test_publishing_procedural_tree_creates_library_steps(
        self, client, auth_headers, test_db
    ):
        # Create a procedural tree
        tree_resp = await client.post("/trees", json={
            "name": "Test Procedure",
            "tree_type": "procedural",
            "tree_structure": {
                "steps": [
                    {"id": "step_1", "type": "procedure_step",
                     "title": "First step", "description": "Do this first"},
                    {"id": "step_2", "type": "procedure_step",
                     "title": "Second step", "description": "Do this second"},
                    {"id": "end_1", "type": "procedure_end", "title": "Done"},
                ]
            }
        }, headers=auth_headers)
        assert tree_resp.status_code == 201
        tree_id = tree_resp.json()["id"]

        # Publish the tree
        pub_resp = await client.put(f"/trees/{tree_id}", json={"status": "published"}, headers=auth_headers)
        assert pub_resp.status_code == 200

        # Check library has entries
        lib_resp = await client.get("/steps", headers=auth_headers)
        assert lib_resp.status_code == 200
        steps = lib_resp.json()
        synced = [s for s in steps if s.get("is_flow_synced")]
        assert len(synced) == 2
        titles = {s["title"] for s in synced}
        assert "First step" in titles
        assert "Second step" in titles

    @pytest.mark.asyncio
    async def test_republishing_updates_existing_library_steps(
        self, client, auth_headers, test_db
    ):
        # Create and publish
        tree_resp = await client.post("/trees", json={
            "name": "Update Test",
            "tree_type": "procedural",
            "tree_structure": {"steps": [
                {"id": "step_1", "type": "procedure_step",
                 "title": "Original title", "description": "Original desc"},
            ]}
        }, headers=auth_headers)
        tree_id = tree_resp.json()["id"]
        await client.put(f"/trees/{tree_id}", json={"status": "published"}, headers=auth_headers)

        # Update step title and republish
        await client.put(f"/trees/{tree_id}", json={
            "tree_structure": {"steps": [
                {"id": "step_1", "type": "procedure_step",
                 "title": "Updated title", "description": "Updated desc"},
            ]},
            "status": "published"
        }, headers=auth_headers)

        # Check library entry was updated
        lib_resp = await client.get("/steps", headers=auth_headers)
        synced = [s for s in lib_resp.json() if s.get("is_flow_synced")]
        assert len(synced) == 1
        assert synced[0]["title"] == "Updated title"
```

**Step 7: Run integration tests**

```bash
cd /home/michaelchihlas/dev/patherly/backend
backend/venv/bin/python -m pytest tests/test_step_sync.py -v --override-ini="addopts="
```

Expected: All tests pass.

**Step 8: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add backend/app/api/endpoints/trees.py backend/tests/test_step_sync.py
git commit -m "feat: trigger step library sync on tree publish/delete

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 7: Frontend — update Step types

**Files:**
- Modify: `frontend/src/types/step.ts`

**Step 1: Read the file to find `Step` and `StepListItem` interfaces**

**Step 2: Add `is_flow_synced` and `source_tree_name` to `Step` (after `is_verified`)**

```typescript
  is_flow_synced: boolean
  source_tree_name: string | null
```

**Step 3: Add same fields to `StepListItem`**

`StepListItem` is the subset used in list views — add there too:

```typescript
  is_flow_synced: boolean
  source_tree_name: string | null
```

**Step 4: Verify build**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -10
```

Expected: Clean build.

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/types/step.ts
git commit -m "feat: add is_flow_synced and source_tree_name to Step types

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 8: Frontend — read-only indicator in `StepCard`

**Files:**
- Modify: `frontend/src/components/step-library/StepCard.tsx`

**Step 1: Read the full `StepCard.tsx` to understand current structure**

Find where the Edit button is rendered (look for `onEdit` prop usage and the edit button JSX).

**Step 2: Add `Lock` to Lucide imports**

```tsx
import { ..., Lock } from 'lucide-react'
```

**Step 3: Replace the edit button condition**

Currently the edit button likely shows when `isOwn` is true. Change it so that for flow-synced steps, the edit button is replaced by a lock icon with a tooltip:

```tsx
{isOwn && (
  step.is_flow_synced ? (
    <span
      title="Managed by source flow — fork to customize"
      className="flex items-center justify-center rounded-md border border-border p-2 text-muted-foreground cursor-default opacity-50"
    >
      <Lock className="h-4 w-4" />
    </span>
  ) : (
    onEdit && (
      <button
        type="button"
        onClick={() => onEdit(step)}
        className="rounded-md border border-border p-2 text-muted-foreground hover:bg-accent hover:text-foreground"
        title="Edit step"
      >
        <Pencil className="h-4 w-4" />
      </button>
    )
  )
)}
```

**Step 4: Add "From Flow" badge**

In the badges/chips area of the card (near where `is_featured` or `is_verified` badges are shown), add:

```tsx
{step.is_flow_synced && (
  <span className="rounded-full bg-blue-400/15 px-1.5 py-0.5 text-[9px] font-semibold uppercase tracking-wide text-blue-400">
    From Flow
  </span>
)}
```

**Step 5: Verify build**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -10
```

Expected: Clean build.

**Step 6: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/components/step-library/StepCard.tsx
git commit -m "feat: show From Flow badge and lock icon on flow-synced StepCard

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 9: Frontend — source flow link in `StepDetailModal`

**Files:**
- Modify: `frontend/src/components/step-library/StepDetailModal.tsx`

**Step 1: Read `StepDetailModal.tsx` to find where step metadata is displayed**

Look for where `author_name`, `usage_count`, `category_name` are rendered in the detail panel.

**Step 2: Add source flow attribution**

In the metadata section, add after the author line:

```tsx
{step.is_flow_synced && step.source_tree_name && (
  <div className="flex items-center gap-1.5 text-xs text-muted-foreground">
    <GitBranch className="h-3.5 w-3.5 shrink-0" />
    <span>Sourced from <span className="font-medium text-foreground">{step.source_tree_name}</span></span>
  </div>
)}
```

Add `GitBranch` to Lucide imports if not already present.

**Step 3: Verify build**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -10
```

Expected: Clean build.

**Step 4: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/components/step-library/StepDetailModal.tsx
git commit -m "feat: show source flow name in StepDetailModal for synced steps

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

### Task 10: Frontend — Library Visibility select in `StepEditor`

**Files:**
- Modify: `frontend/src/components/procedural-editor/StepEditor.tsx`
- Modify: `frontend/src/types/tree.ts` (add `library_visibility` to `ProceduralStep`)

**Step 1: Add `library_visibility` to `ProceduralStep` in `frontend/src/types/tree.ts`**

Find `ProceduralStep` (line ~106) and add after `reference_url?`:

```typescript
  library_visibility?: 'team' | 'public'
```

**Step 2: Read `StepEditor.tsx` lines 130–200 to find the More Options block**

The `{showMore && <div>}` block starts around line 150. Find the last field inside it.

**Step 3: Add Library Visibility select inside the More Options block**

At the end of the `showMore` content block, before the closing `</div>`, add:

```tsx
{/* Library Visibility — only for procedure_step nodes */}
{step.type === 'procedure_step' && (
  <div>
    <label className="mb-1.5 block text-xs font-medium text-muted-foreground">
      Library Visibility
    </label>
    <select
      value={step.library_visibility ?? ''}
      onChange={(e) => onUpdate({
        library_visibility: e.target.value === '' ? undefined : e.target.value as 'team' | 'public'
      })}
      className="w-full rounded-lg border border-border bg-card px-3 py-2 text-sm text-foreground focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary/20"
    >
      <option value="">Inherit from flow</option>
      <option value="team">Team only</option>
      <option value="public">Public</option>
    </select>
    <p className="mt-1 text-[10px] text-muted-foreground">
      Controls visibility in the step library. Defaults to the flow's own visibility setting.
    </p>
  </div>
)}
```

**Step 4: Verify build**

```bash
cd /home/michaelchihlas/dev/patherly/frontend && npm run build 2>&1 | tail -10
```

Expected: Clean build.

**Step 5: Commit**

```bash
cd /home/michaelchihlas/dev/patherly
git add frontend/src/types/tree.ts frontend/src/components/procedural-editor/StepEditor.tsx
git commit -m "feat: add Library Visibility select to procedural StepEditor

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>"
```

---

## Manual Verification Checklist

1. **Publish sync:** Create a procedural flow with 2+ steps and a section header → publish → open Step Library → synced steps appear with "From Flow" badge, correct section in group_label
2. **Republish update:** Edit a step title in a published flow → republish → Step Library shows updated title (not a duplicate)
3. **Visibility inherit:** Public flow → synced steps have `visibility: 'public'`. Team flow → `visibility: 'team'`
4. **Per-step override:** Set Library Visibility to "Team only" on a step in a public flow → publish → that step appears as `team` in library while others are `public`
5. **Read-only in library:** Synced step shows lock icon instead of edit button, tooltip reads "Managed by source flow"
6. **Source flow name:** Click a synced step → detail panel shows "Sourced from: [Flow Name]"
7. **Fork works:** Click "Save to Library" on a synced step → creates a personal copy with `is_flow_synced: false`, editable normally
8. **Troubleshooting sync:** Publish a troubleshooting flow → action and solution nodes appear in library (decision nodes do not)
