Subagent-Driven Development Skill

Subagent-Driven Development

Execute plan by dispatching fresh subagent per task, with two-stage review after each: spec compliance review first, then code quality review.

Core principle: Fresh subagent per task + two-stage review (spec then quality) = high quality, fast iteration

When to Use

digraph when_to_use {
    "Have implementation plan?" [shape=diamond];
    "Tasks mostly independent?" [shape=diamond];
    "Stay in this session?" [shape=diamond];
    "subagent-driven-development" [shape=box];
    "executing-plans" [shape=box];
    "Manual execution or brainstorm first" [shape=box];

    "Have implementation plan?" -> "Tasks mostly independent?" [label="yes"];
    "Have implementation plan?" -> "Manual execution or brainstorm first" [label="no"];
    "Tasks mostly independent?" -> "Stay in this session?" [label="yes"];
    "Tasks mostly independent?" -> "Manual execution or brainstorm first" [label="no - tightly coupled"];
    "Stay in this session?" -> "subagent-driven-development" [label="yes"];
    "Stay in this session?" -> "executing-plans" [label="no - parallel session"];
}

vs. Executing Plans (parallel session):

Same session (no context switch)
Fresh subagent per task (no context pollution)
Two-stage review after each task: spec compliance first, then code quality
Faster iteration (no human-in-loop between tasks)

The Process

digraph process {
    rankdir=TB;

    subgraph cluster_per_task {
        label="Per Task";
        "Dispatch implementation subagent (selected by mapping, ./implementer-prompt.md)" [shape=box];
        "Implementation subagent asks questions?" [shape=diamond];
        "Answer questions, provide context" [shape=box];
        "Implementation subagent implements, tests, commits, self-reviews" [shape=box];
        "Dispatch spec reviewer subagent (./spec-reviewer-prompt.md)" [shape=box];
        "Spec reviewer subagent confirms code matches spec?" [shape=diamond];
        "Implementation subagent fixes spec gaps" [shape=box];
        "Dispatch code quality reviewer subagent (./code-quality-reviewer-prompt.md)" [shape=box];
        "Code quality reviewer subagent approves?" [shape=diamond];
        "Implementation subagent fixes quality issues" [shape=box];
        "Mark task complete in TodoWrite" [shape=box];
    }

    "Read plan, extract all tasks with full text, note context, create TodoWrite" [shape=box];
    "More tasks remain?" [shape=diamond];
    "Dispatch final code reviewer subagent for entire implementation" [shape=box];
    "Done" [shape=box style=filled fillcolor=lightgreen];

    "Read plan, extract all tasks with full text, note context, create TodoWrite" -> "Dispatch implementation subagent (selected by mapping, ./implementer-prompt.md)";
    "Dispatch implementation subagent (selected by mapping, ./implementer-prompt.md)" -> "Implementation subagent asks questions?";
    "Implementation subagent asks questions?" -> "Answer questions, provide context" [label="yes"];
    "Answer questions, provide context" -> "Dispatch implementation subagent (selected by mapping, ./implementer-prompt.md)";
    "Implementation subagent asks questions?" -> "Implementation subagent implements, tests, commits, self-reviews" [label="no"];
    "Implementation subagent implements, tests, commits, self-reviews" -> "Dispatch spec reviewer subagent (./spec-reviewer-prompt.md)";
    "Dispatch spec reviewer subagent (./spec-reviewer-prompt.md)" -> "Spec reviewer subagent confirms code matches spec?";
    "Spec reviewer subagent confirms code matches spec?" -> "Implementation subagent fixes spec gaps" [label="no"];
    "Implementation subagent fixes spec gaps" -> "Dispatch spec reviewer subagent (./spec-reviewer-prompt.md)" [label="re-review"];
    "Spec reviewer subagent confirms code matches spec?" -> "Dispatch code quality reviewer subagent (./code-quality-reviewer-prompt.md)" [label="yes"];
    "Dispatch code quality reviewer subagent (./code-quality-reviewer-prompt.md)" -> "Code quality reviewer subagent approves?";
    "Code quality reviewer subagent approves?" -> "Implementation subagent fixes quality issues" [label="no"];
    "Implementation subagent fixes quality issues" -> "Dispatch code quality reviewer subagent (./code-quality-reviewer-prompt.md)" [label="re-review"];
    "Code quality reviewer subagent approves?" -> "Mark task complete in TodoWrite" [label="yes"];
    "Mark task complete in TodoWrite" -> "More tasks remain?";
    "More tasks remain?" -> "Dispatch implementation subagent (selected by mapping, ./implementer-prompt.md)" [label="yes"];
    "More tasks remain?" -> "Dispatch final code reviewer subagent for entire implementation" [label="no"];
    "Dispatch final code reviewer subagent for entire implementation" -> "Done";
}

Prompt Templates

./implementer-prompt.md - Dispatch implementation subagent (selected subagent_type)
./spec-reviewer-prompt.md - Dispatch spec compliance reviewer subagent
./code-quality-reviewer-prompt.md - Dispatch code quality reviewer subagent

Implementer Dispatch Mapping

Before dispatching an implementation subagent, choose subagent_type from the mapping below.

Selection rules:

Build the available droid list from ~/.factory/droids (filenames without .md).
If the task includes explicit tags like [frontend] or type:frontend, use that category.
Otherwise match keywords (most specific match wins).
If the chosen droid is missing, fall back to general-purpose.
Do not use review-only droids (e.g., code-reviewer) for implementation tasks.

Keyword mapping (examples; extend as needed):

frontend-developer: [react, next, ui, component, hook, hooks, tsx, tailwind, shadcn]
ui-ux-designer: [design, wireframe, mockup, ux, user-flow]
ui-visual-validator: [visual, screenshot, pixel, a11y, regression]
backend-specialist: [api, rest, graphql, auth, service, microservice]
fastapi-pro: [fastapi, pydantic, starlette]
django-pro: [django, drf, channels, celery]
python-pro: [python, asyncio, pip, venv]
javascript-pro: [javascript, node, npm, promises]
typescript-pro: [typescript, ts, tsconfig, types]
java-pro: [java, spring, jvm]
golang-pro: [go, golang, goroutine]
rust-pro: [rust, cargo, lifetimes]
cpp-specialist: [c++, cpp, cmake]
csharp-pro: [c#, dotnet, asp.net]
php-pro: [php, laravel]
ruby-pro: [ruby, rails]
scala-pro: [scala, akka, zio]
elixir-pro: [elixir, phoenix, otp]
flutter-expert: [flutter, dart]
wordpress-developer: [wordpress, wp, plugin, theme]
database-specialist: [database, schema, migration, index, postgres, mysql]
sql-pro: [sql, query, join, cte]
data-specialist: [etl, pipeline, warehouse, analytics]
mlops-engineer: [mlops, training, model-deploy, mlflow]
ai-engineer: [llm, rag, embeddings, vector, prompt-pipeline]
prompt-engineer: [prompt, system-prompt, eval, jailbreak]
security-specialist: [security, owasp, vuln, encryption]
devops-specialist: [ci, cd, docker, terraform, pipeline]
kubernetes-architect: [k8s, kubernetes, helm, argo]
hybrid-cloud-architect: [multi-cloud, aws, azure, gcp, hybrid]
network-engineer: [vpc, dns, tls, routing, cdn]
observability-engineer: [logging, tracing, metrics, slo, sli]
incident-responder: [incident, outage, oncall, pagerduty]
test-automator: [test, e2e, unit, coverage, qa]
debugger: [bug, crash, stacktrace, failure]
legacy-modernizer: [legacy, migration, modernization, upgrade]
seo-specialist: [seo, sitemap, meta]
payment-integration: [stripe, paypal, checkout, billing]
mermaid-expert: [mermaid, diagram, flowchart]
documentation-specialist: [docs, documentation, api-doc]
dx-optimizer: [dx, tooling, dev-experience]
architect-review: [architecture, design-review]
search-specialist: [research, web-search, competitive]
blockchain-developer: [web3, solidity, smart-contract]
business-analyst: [kpi, metrics, roadmap, analysis]
context-manager: [context, memory, summarization]
orchestrator: [coordination, delegate, multi-agent]
general-purpose: []

Example Workflow

You: I'm using Subagent-Driven Development to execute this plan.

[Read plan file once: docs/plans/feature-plan.md]
[Extract all 5 tasks with full text and context]
[Create TodoWrite with all tasks]

Task 1: Hook installation script

[Get Task 1 text and context (already extracted)]
[Dispatch implementation subagent (selected by mapping) with full task text + context]

Implementer: "Before I begin - should the hook be installed at user or system level?"

You: "User level (~/.config/superpowers/hooks/)"

Implementer: "Got it. Implementing now..."
[Later] Implementer:
  - Implemented install-hook command
  - Added tests, 5/5 passing
  - Self-review: Found I missed --force flag, added it
  - Committed

[Dispatch spec compliance reviewer]
Spec reviewer: ✅ Spec compliant - all requirements met, nothing extra

[Get git SHAs, dispatch code quality reviewer]
Code reviewer: Strengths: Good test coverage, clean. Issues: None. Approved.

[Mark Task 1 complete]

Task 2: Recovery modes

[Get Task 2 text and context (already extracted)]
[Dispatch implementation subagent (selected by mapping) with full task text + context]

Implementer: [No questions, proceeds]
Implementer:
  - Added verify/repair modes
  - 8/8 tests passing
  - Self-review: All good
  - Committed

[Dispatch spec compliance reviewer]
Spec reviewer: ❌ Issues:
  - Missing: Progress reporting (spec says "report every 100 items")
  - Extra: Added --json flag (not requested)

[Implementer fixes issues]
Implementer: Removed --json flag, added progress reporting

[Spec reviewer reviews again]
Spec reviewer: ✅ Spec compliant now

[Dispatch code quality reviewer]
Code reviewer: Strengths: Solid. Issues (Important): Magic number (100)

[Implementer fixes]
Implementer: Extracted PROGRESS_INTERVAL constant

[Code reviewer reviews again]
Code reviewer: ✅ Approved

[Mark Task 2 complete]

...

[After all tasks]
[Dispatch final code-reviewer]
Final reviewer: All requirements met, ready to merge

Done!

Advantages

vs. Manual execution:

Subagents follow TDD naturally
Fresh context per task (no confusion)
Parallel-safe (subagents don't interfere)
Subagent can ask questions (before AND during work)

vs. Executing Plans:

Same session (no handoff)
Continuous progress (no waiting)
Review checkpoints automatic

Efficiency gains:

No file reading overhead (controller provides full text)
Controller curates exactly what context is needed
Subagent gets complete information upfront
Questions surfaced before work begins (not after)

Quality gates:

Self-review catches issues before handoff
Two-stage review: spec compliance, then code quality
Review loops ensure fixes actually work
Spec compliance prevents over/under-building
Code quality ensures implementation is well-built

Cost:

More subagent invocations (implementer + 2 reviewers per task)
Controller does more prep work (extracting all tasks upfront)
Review loops add iterations
But catches issues early (cheaper than debugging later)

Red Flags

Never:

Skip reviews (spec compliance OR code quality)
Proceed with unfixed issues
Dispatch multiple implementation subagents in parallel (conflicts)
Make subagent read plan file (provide full text instead)
Skip scene-setting context (subagent needs to understand where task fits)
Ignore subagent questions (answer before letting them proceed)
Accept "close enough" on spec compliance (spec reviewer found issues = not done)
Skip review loops (reviewer found issues = implementer fixes = review again)
Let implementer self-review replace actual review (both are needed)
Start code quality review before spec compliance is ✅ (wrong order)
Move to next task while either review has open issues

If subagent asks questions:

Answer clearly and completely
Provide additional context if needed
Don't rush them into implementation

If reviewer finds issues:

Implementer (same subagent) fixes them
Reviewer reviews again
Repeat until approved
Don't skip the re-review

If subagent fails task:

Re-select a valid subagent_type from the available list
Dispatch fix subagent with specific instructions
Don't try to fix manually (context pollution)

Integration

Required workflow skills:

writing-plans - Creates the plan this skill executes
requesting-code-review - Code review template for reviewer subagents

Subagents should use:

test-driven-development - Subagents follow TDD for each task

Alternative workflow:

executing-plans - Use for parallel session instead of same-session execution

Agent Skills: Subagent-Driven Development

Skill Files