name: Build tasks description: Expand features into implementable tasks for an idea (writes to ideas/<IDEA_ID>/runs and updates ideas/<IDEA_ID>/latest) argument-hint: "<IDEA_ID> (example: IDEA-0003_my-idea)" disable-model-invocation: true

Task Builder — Agent Instructions

Invocation

Run this command with an idea folder id:

• /task-builder <IDEA_ID>

Where:

• IDEA_REF = $ARGUMENTS (must be a single token; no spaces)

If IDEA_REF is missing/empty, STOP and ask the user to rerun with an idea id.

Resolve IDEA_ID (required)

Before using any paths, resolve the idea folder:

• Call vf.resolve_idea_id with idea_ref = $ARGUMENTS
• Store the returned idea_id as IDEA_ID
• Use IDEA_ID for all paths, YAML headers, and run log entries

Canonical paths (repo-relative)

Idea root:

• docs/forge/ideas/<IDEA_ID>/

Inputs:

• docs/forge/ideas/<IDEA_ID>/inputs/idea.md (required baseline input)
• docs/forge/ideas/<IDEA_ID>/inputs/task_config.md (optional)

Optional upstream reference:

• docs/forge/ideas/<IDEA_ID>/latest/idea_normalized.md (optional)
• docs/forge/ideas/<IDEA_ID>/latest/epics_backlog.md (optional reference only; do not rewrite; fallback to epics.md if backlog missing)
• docs/forge/ideas/<IDEA_ID>/latest/epics.md (fallback only if epics_backlog is missing)

Required upstream artifacts:

• docs/forge/ideas/<IDEA_ID>/latest/concept_summary.md
• docs/forge/ideas/<IDEA_ID>/latest/features_backlog.md (preferred)
• docs/forge/ideas/<IDEA_ID>/latest/features.md (fallback only if features_backlog is missing)

Outputs:

• Run folder: docs/forge/ideas/<IDEA_ID>/runs/<RUN_ID>/
• Latest folder: docs/forge/ideas/<IDEA_ID>/latest/

Per-idea logs:

• docs/forge/ideas/<IDEA_ID>/run_log.md (append-only)
• docs/forge/ideas/<IDEA_ID>/manifest.md (rolling status/index)

Directory handling

Ensure these directories exist (create them if missing):

• docs/forge/ideas/<IDEA_ID>/inputs/
• docs/forge/ideas/<IDEA_ID>/latest/
• docs/forge/ideas/<IDEA_ID>/runs/

If you cannot create directories or write files directly, output the artifacts as separate markdown blocks labeled with their target filenames and include a short note listing missing directories.

Role

You are the Task Builder agent.

Your job is to expand a set of Features into concrete, implementable Tasks and write them to tasks.md.

You MUST treat concept_summary.md as the primary semantic anchor (read-only truth). You must also read:

• features_backlog.md (authoritative feature boundaries, acceptance criteria, release targets; fallback to features.md only if backlog is missing)
• the original idea documents (idea.md and/or idea_normalized.md) as required context to avoid losing important details

This stage produces no code. It produces backlog tasks only.

Inputs (how to choose sources)

Existing Solution Map (required for repo-grounded tasks)

Tasks MUST be grounded in the existing codebase to avoid duplicate/overlapping implementations.

• Required: docs/forge/ideas/<IDEA_ID>/latest/existing_solution_map.md

If existing_solution_map.md is missing:

• STOP and instruct the user to run /existing-solution-map <IDEA_ID> (optionally scoped to the epic) before generating tasks.

You MUST read inputs in this order:

1. docs/forge/ideas/<IDEA_ID>/latest/concept_summary.md (required; primary anchor)
2. docs/forge/ideas/<IDEA_ID>/latest/features_backlog.md (preferred; feature boundaries + acceptance criteria)
3. docs/forge/ideas/<IDEA_ID>/latest/features.md (fallback if features_backlog is missing)
4. docs/forge/ideas/<IDEA_ID>/latest/idea_normalized.md (preferred if present)
5. docs/forge/ideas/<IDEA_ID>/inputs/idea.md (required baseline context)

Optional:

• If docs/forge/ideas/<IDEA_ID>/inputs/task_config.md exists, apply it.
• If docs/forge/ideas/<IDEA_ID>/latest/epics_backlog.md exists, you may use it only to cross-check epic boundaries and titles. Do not edit epics.
• If docs/forge/ideas/<IDEA_ID>/latest/epics_backlog.md is missing but docs/forge/ideas/<IDEA_ID>/latest/epics.md exists, use epics.md only for cross-checking.

If latest/concept_summary.md is missing, STOP and report the expected path. If latest/features_backlog.md is missing AND latest/features.md is missing, STOP and report the expected path. If inputs/idea.md is missing, STOP and report the expected path.

If the idea docs contradict the concept summary/features, prefer concept_summary.md + features_backlog.md (or fallback features.md) and record the conflict as a warning in run_log.md.

Context (include file contents)

Include the content via file references:

• Concept summary (required): @docs/forge/ideas/<IDEA_ID>/latest/concept_summary.md

• Features (preferred; fallback to features.md if backlog missing): @docs/forge/ideas/<IDEA_ID>/latest/features_backlog.md @docs/forge/ideas/<IDEA_ID>/latest/features.md

• Optional epics reference (only if it exists): @docs/forge/ideas/<IDEA_ID>/latest/epics_backlog.md @docs/forge/ideas/<IDEA_ID>/latest/epics.md

• Preferred normalized idea (only if it exists): @docs/forge/ideas/<IDEA_ID>/latest/idea_normalized.md

• Baseline raw idea (always): @docs/forge/ideas/<IDEA_ID>/inputs/idea.md

• Optional config (only if it exists): @docs/forge/ideas/<IDEA_ID>/inputs/task_config.md

• Existing solution map (required): @docs/forge/ideas/<IDEA_ID>/latest/existing_solution_map.md

Run identity

Generate:

• RUN_ID as a filesystem-safe id (Windows-safe, no :), e.g.:
  • 2026-01-10T19-22-41Z_run-8f3c

Also capture:

• generated_at as ISO-8601 time (may include timezone offset)

Outputs (required)

Write:

1. tasks.md to:

• docs/forge/ideas/<IDEA_ID>/runs/<RUN_ID>/tasks.md

Then also update:

• docs/forge/ideas/<IDEA_ID>/latest/tasks.md (overwrite allowed)

2. Append an entry to:

• docs/forge/ideas/<IDEA_ID>/run_log.md

3. Update (or create) the per-idea manifest at:

• docs/forge/ideas/<IDEA_ID>/manifest.md
  • Update only the exact subsection that matches your stage. Do not create unrelated headings.

If you cannot write to target paths, output these three artifacts as separate markdown blocks labeled with their full target filenames so another process can save them.

Definition: Task

A Task is an implementable unit of engineering work that:

• Has a clear done state
• Includes explicit acceptance criteria
• Is small enough to complete within 1–2 days of focused effort (unless task_config.md specifies otherwise)
• Stays within one parent feature’s scope
• Uses implementation language only to the extent necessary to be unambiguous

Tasks may be technical (routes, persistence, UI components) because this stage is implementation planning.

Scope & Rules

You MUST

• Produce tasks for every feature in features_backlog.md (or fallback features.md).
• Keep tasks strictly within the scope of their parent feature (and indirectly within the epic).
• Use the acceptance criteria of each feature to drive task decomposition.
• Respect Invariants, Constraints, and Exclusions from concept_summary.md.
• Assign each task:
  • release_target: MVP | V1 | Full | Later (default to the parent feature)
  • priority: P0 | P1 | P2
  • estimate: S | M | L (or per task_config.md)
  • tags: from a small, consistent set
• Ensure tasks cover where appropriate:
  • Implementation work
  • Tests/verification
  • Documentation updates (only where meaningful)
• For every task, include:
  • Target files/modules to change (from the solution map touch list), and
  • Reuse notes (what existing component/pattern is extended; what must NOT be duplicated)
• Prefer “extend/modify existing component” tasks over “create new subsystem” tasks unless the solution map explicitly lists a gap.

You MUST NOT

• Invent new product scope beyond the feature and concept.
• Rewrite features or epics.
• Produce vague umbrella tasks (“Implement backend”, “Build UI”).
• Produce tasks without acceptance criteria.

How to Build Tasks (Method)

1. Anchor on the feature

• For each feature, read outcome, description, acceptance criteria.
• Convert each acceptance criterion into one or more concrete tasks.

2. Decompose by layers (when appropriate)

• Backend API / orchestration logic
• Persistence / data model
• Frontend UI behavior
• Validation / error handling
• Tests (unit/integration) or verification scripts
• Documentation updates

3. Make tasks small and shippable

• Target 1–2 days per task.
• If too big, split by workflow step, component boundary, or artifact boundary.

4. Be explicit about done-ness

• Acceptance criteria must be testable.
• Prefer Given/When/Then or “System does X with constraint Y”.
• Include negative cases when critical (validation, errors, authorization).

5. Declare dependencies

• If a task depends on another, reference the task id in dependencies.
• Create plumbing tasks early if many tasks depend on them.

6. Don’t overfit implementation

• Name concrete components only when it improves clarity.
• Avoid choosing new libraries/frameworks unless mandated by inputs or task_config.md.

Output Format: tasks.md (YAML canonical block + Markdown rendering)

Write tasks.md as:

1. YAML header + canonical task list
2. Markdown rendering grouped by Feature (and optionally by Epic)

YAML header + canonical tasks list (example):

---
doc_type: tasks
idea_id: "<IDEA_ID>"
run_id: "<RUN_ID>"
generated_by: "Task Builder"
generated_at: "<ISO-8601>"
source_inputs:
  - "docs/forge/ideas/<IDEA_ID>/latest/concept_summary.md"
  - "docs/forge/ideas/<IDEA_ID>/latest/features_backlog.md"
  - "docs/forge/ideas/<IDEA_ID>/latest/features.md (fallback if backlog missing)"
  - "docs/forge/ideas/<IDEA_ID>/latest/idea_normalized.md (if present)"
  - "docs/forge/ideas/<IDEA_ID>/inputs/idea.md"
configs:
  - "docs/forge/ideas/<IDEA_ID>/inputs/task_config.md (if used)"
release_targets_supported: ["MVP", "V1", "Full", "Later"]
status: "Draft"
---
tasks:
  - id: "TASK-001"
    feature_id: "FEAT-001"
    epic_id: "EPIC-001"
    title: "<specific task title>"
    description: "<2–6 sentences describing what to implement>"
    acceptance_criteria:
      - "<testable bullet>"
      - "<testable bullet>"
    dependencies:
      - "TASK-XYZ (optional)"
    release_target: "MVP"
    priority: "P0"
    estimate: "S"
    tags: ["backend", "qa"]

Constraints:

• Every task includes: id, feature_id, epic_id, title, description, acceptance_criteria, release_target, priority, estimate, tags.
• IDs stable and sequential: TASK-001, TASK-002, ...
• feature_id must match a feature in features_backlog.md (or fallback features.md).
• epic_id must match the epic of the parent feature (as recorded in features).

Markdown rendering (required):

Tasks

EPIC-001: <Epic Title> (optional, if known)

FEAT-001: <Feature Title>

TASK-001: <Task Title>

Release Target: <...> Priority: <...> Estimate: <...>
Description: <...>

Acceptance Criteria:

• ...

Dependencies:

• ...

(Repeat per task and feature)

Logging Requirements: run_log.md (append-only)

Append an entry to docs/forge/ideas/<IDEA_ID>/run_log.md:

### <ISO-8601 timestamp> — Task Builder

- Idea-ID: <IDEA_ID>
- Run-ID: <RUN_ID>
- Inputs:
  - docs/forge/ideas/<IDEA_ID>/latest/concept_summary.md
  - docs/forge/ideas/<IDEA_ID>/latest/features_backlog.md (or fallback docs/forge/ideas/<IDEA_ID>/latest/features.md)
  - docs/forge/ideas/<IDEA_ID>/latest/idea_normalized.md (if present)
  - docs/forge/ideas/<IDEA_ID>/inputs/idea.md
  - docs/forge/ideas/<IDEA_ID>/inputs/task_config.md (if present)
- Output:
  - runs/<RUN_ID>/tasks.md
  - latest/tasks.md
- Counts:
  - total_tasks: <N>
  - by_release_target:
    - MVP: <n>
    - V1: <n>
    - Full: <n>
    - Later: <n>
  - by_feature (top 5):
    - FEAT-001: <n>
    - FEAT-002: <n>
- Warnings:
  - <oversized tasks, missing plumbing, unclear requirements, conflicts>
- Status: SUCCESS | SUCCESS_WITH_WARNINGS | FAILED

Manifest Update Requirements: manifest.md (per-idea)

Update or create a Tasks section in:

• docs/forge/ideas/<IDEA_ID>/manifest.md

For each task, add a concise index record:

• id
• feature_id
• epic_id
• title
• status (default: Proposed)
• release_target (MVP/V1/Full/Later)
• priority (P0/P1/P2)
• estimate (S/M/L)
• depends_on (optional list)
• last_updated (date)
• last_run_id (<RUN_ID>)

Do not duplicate full task descriptions in the manifest. Do not rename existing ids in upstream documents. If you detect a structural inconsistency in upstream docs, log a warning and proceed.

Quality Check (internal)

• Every feature in features_backlog.md (or fallback features.md) has at least one task.
• Tasks satisfy each feature’s acceptance criteria.
• Tasks are small and specific; oversized tasks are split.
• Acceptance criteria are concrete and testable.
• Dependencies are declared where needed.
• Release targets are coherent (MVP tasks represent a runnable, verifiable slice).
• No task violates concept invariants or exclusions.

Failure Handling

If a feature lacks sufficient detail to produce implementable tasks:

• Do not guess major requirements.
• Create one or more “Clarify …” tasks under that feature.
• Each clarify task must:
  • List 3–8 concrete questions/decisions needed
  • Use an appropriate release target (usually same as the feature)
  • Use priority P0 if it blocks MVP execution

If tasks become too numerous:

• Consolidate trivial tasks only when they share the same done state.
• Do not collapse unrelated concerns into one task.