Generate individual tasks/WP*.md prompt files from the manifest in wps.yaml. This step reads wps.yaml (written in tasks-outline), updates it with per-WP details, then generates the WP prompt files.

This step assumes wps.yaml already exists with complete WP definitions.

📍 WORKING DIRECTORY: Stay in the project root checkout

IMPORTANT: This step works in the project root checkout. NO worktrees created.

In repos with multiple missions, always pass --mission <handle> to every spec-kitty command. The <handle> can be the mission's mission_id (ULID), mid8 (first 8 chars of the ULID), or mission_slug. The resolver disambiguates by mission_id and returns a structured MISSION_AMBIGUOUS_SELECTOR error on ambiguity — there is no silent fallback.

User Input

The content of the user's message that invoked this skill (everything after the skill invocation token, e.g. after /spec-kitty.<command> or $spec-kitty.<command>) is the User Input referenced elsewhere in these instructions.

You MUST consider this user input before proceeding (if not empty).

Steps

1. Setup

Run:

spec-kitty agent context resolve --action tasks_packages --mission <mission-slug> --json

Then execute the returned check_prerequisites command and capture feature_dir. All paths must be absolute.

2. Load `wps.yaml`

Read feature_dir/wps.yaml. This is the manifest written in the previous step. Each entry defines a WP with its id, title, dependencies, and partial metadata.

Parse all work package entries. The YAML structure is:

work_packages:
  - id: WP01
    title: "..."
    dependencies: [...]   # may be present (authoritative) or absent
    owned_files: [...]    # may be absent — fill in this step
    requirement_refs: [...] # may be absent — fill in this step
    subtasks: [...]
    prompt_file: null     # fill in this step

3. Generate Prompt Files

For each work package defined in wps.yaml:

CRITICAL PATH RULE: All WP files MUST be created in a FLAT feature_dir/tasks/ directory, NOT in subdirectories!

Correct: feature_dir/tasks/WPxx-slug.md (flat, no subdirectories)
WRONG: feature_dir/tasks/planned/, feature_dir/tasks/doing/, or ANY status subdirectories

For each WP:

Derive a kebab-case slug from the title
Filename: WPxx-slug.md (e.g., WP01-create-html-page.md)
Full path: feature_dir/tasks/WP01-create-html-page.md
Follow the WP prompt template structure below (do NOT write instructions to read a template file from .kittify/)
Include frontmatter with:
- work_package_id, subtasks array, dependencies, history entry
- requirement_refs array from the WP's requirement_refs in wps.yaml
- owned_files, authoritative_surface, execution_mode (required ownership fields)
Include in body:
- Objective, context, detailed guidance per subtask
- Test strategy (only if requested)
- Definition of Done, risks, reviewer guidance

TARGET PROMPT SIZE: 200-500 lines per WP (3-7 subtasks) MAXIMUM PROMPT SIZE: 700 lines per WP (10 subtasks max) If prompts are >700 lines: Split the WP — it's too large

IMPORTANT: All WP files live in flat tasks/ directory. Status is managed via status.events.jsonl, not by directory location or frontmatter fields.

4. Update `wps.yaml` With Per-WP Details

After generating each WP prompt file, update the corresponding entry in wps.yaml to fill in owned_files, requirement_refs, subtasks, and prompt_file. Write the updated wps.yaml back to disk after each WP is generated (or accumulate changes and write once at the end).

Critical rule: Do NOT modify a dependencies field that is already present in wps.yaml — even if it is empty ([]). It is authoritative. Only populate dependencies for entries where the key is absent from wps.yaml.

Example of a fully-populated entry after this step:

- id: WP02
  title: "Build API"
  dependencies:
    - WP01
  owned_files:
    - "src/api/**"
  requirement_refs:
    - FR-001
    - NFR-001
  subtasks:
    - T001
    - T002
  prompt_file: "tasks/WP02-build-api.md"

The frontmatter in each WP prompt file MUST include a dependencies field:

---
work_package_id: "WP02"
title: "Build API"
dependencies: ["WP01"]  # From wps.yaml
requirement_refs: ["FR-001", "NFR-001"]  # From wps.yaml requirement_refs
subtasks: ["T001", "T002"]
owned_files: ["src/api/**"]
authoritative_surface: "src/api/"
execution_mode: "code_change"
---

Include the correct implementation command:

spec-kitty agent action implement WP01 --agent <name>
spec-kitty agent action implement WP02 --agent <name>

finalize_tasks computes execution lanes from dependencies and write ownership. Agents never choose a base branch manually.

Ownership rules:

owned_files: List of glob patterns for files this WP touches — no two WPs may overlap.
authoritative_surface: Path prefix that must be a prefix of at least one owned_files entry.
execution_mode: "code_change" for source code changes, "planning_artifact" for kitty-specs docs.
Agents working on a WP must not modify files outside their owned_files list.

5. Self-Check

After generating each prompt:

Subtask count: 3-7? ✓ | 8-10? ⚠️ | 11+? ❌ SPLIT
Estimated lines: 200-500? ✓ | 500-700? ⚠️ | 700+? ❌ SPLIT
Can implement in one session? ✓ | Multiple sessions needed? ❌ SPLIT

Output

After completing this step:

feature_dir/tasks/WP*.md prompt files exist for all work packages
Each has proper frontmatter with work_package_id, dependencies, owned_files, authoritative_surface, execution_mode
feature_dir/wps.yaml is fully populated: all owned_files, requirement_refs, subtasks, and prompt_file fields are set

Next step: spec-kitty next --agent <name> will advance to finalization.

Prompt Quality Guidelines

Good prompt (~60 lines per subtask):

### Subtask T001: Implement User Login Endpoint

**Purpose**: Create POST /api/auth/login endpoint that validates credentials and returns JWT token.

**Steps**:
1. Create endpoint handler in `src/api/auth.py`:
   - Route: POST /api/auth/login
   - Request body: `{email: string, password: string}`
   - Response: `{token: string, user: UserProfile}` on success
   - Error codes: 400, 401, 429

2. Implement credential validation:
   - Hash password with bcrypt
   - Use constant-time comparison

**Files**: `src/api/auth.py` (new, ~80 lines)
**Validation**: Valid credentials return 200 with token

Bad prompt (~20 lines per subtask):

### T001: Add auth
Steps: Create endpoint. Add validation. Test it.

Context for work-package planning: (refer to the User Input section above)

spec-kitty-tasks-packages

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