team-visual-a11y

name	team-visual-a11y
description	Unified team skill for visual accessibility QA. OKLCH color contrast, typography readability, focus management, WCAG AA/AAA audit at rendered level. Uses team-worker agent architecture. Triggers on "team visual a11y", "accessibility audit", "visual a11y".
allowed-tools	spawn_agent(*), wait_agent(*), send_message(*), followup_task(*), close_agent(*), list_agents(*), report_agent_job_result(*), request_user_input(*), Read(*), Write(*), Edit(*), Bash(*), Glob(*), Grep(*), mcp__ccw-tools__read_file(*), mcp__ccw-tools__write_file(*), mcp__ccw-tools__edit_file(*), mcp__ccw-tools__team_msg(*), mcp__chrome-devtools__evaluate_script(*), mcp__chrome-devtools__take_screenshot(*), mcp__chrome-devtools__emulate(*), mcp__chrome-devtools__lighthouse_audit(*), mcp__chrome-devtools__navigate_page(*), mcp__chrome-devtools__resize_page(*)

Team Visual Accessibility

Deep visual accessibility QA: OKLCH-based perceptual color contrast, typography readability at all viewports, focus-visible completeness, WCAG AA/AAA audit at rendered level. Built on team-worker agent architecture -- all worker roles share a single agent definition with role-specific Phase 2-4 loaded from roles/<role>/role.md.

Architecture

Skill(skill="team-visual-a11y", args="task description")
                    |
         SKILL.md (this file) = Router
                    |
     +--------------+--------------+
     |                             |
  no --role flag              --role <name>
     |                             |
  Coordinator                  Worker
  roles/coordinator/role.md    roles/<name>/role.md
     |
     +-- analyze -> dispatch -> spawn workers -> STOP
                                    |
                    +-------+-------+-------+
                    v       v       v       |
           [3 auditors spawn in PARALLEL]   |
        color-auditor  typo-auditor  focus-auditor
                    |       |       |
                    +---+---+---+---+
                        v
               remediation-planner
                        |
                        v
               fix-implementer (inner_loop)
                        |
                        v
               [re-audit: color + focus in PARALLEL]

Role Registry

Role	Path	Prefix	Inner Loop
coordinator	roles/coordinator/role.md	--	--
color-auditor	roles/color-auditor/role.md	COLOR-*	false
typo-auditor	roles/typo-auditor/role.md	TYPO-*	false
focus-auditor	roles/focus-auditor/role.md	FOCUS-*	false
remediation-planner	roles/remediation-planner/role.md	REMED-*	false
fix-implementer	roles/fix-implementer/role.md	FIX-*	true

Role Router

Parse $ARGUMENTS:

• Has --role <name> -> Read roles/<name>/role.md, execute Phase 2-4
• No --role -> roles/coordinator/role.md, execute entry router

Delegation Lock

Coordinator is a PURE ORCHESTRATOR. It coordinates, it does NOT do.

Before calling ANY tool, apply this check:

Tool Call	Verdict	Reason
spawn_agent, wait_agent, close_agent, send_message, followup_task	ALLOWED	Orchestration
list_agents	ALLOWED	Agent health check
request_user_input	ALLOWED	User interaction
mcp__ccw-tools__team_msg	ALLOWED	Message bus
Read/Write on .workflow/.team/ files	ALLOWED	Session state
Read on roles/, commands/, specs/	ALLOWED	Loading own instructions
Read/Grep/Glob on project source code	BLOCKED	Delegate to worker
Edit on any file outside .workflow/	BLOCKED	Delegate to worker
Bash("ccw cli ...")	BLOCKED	Only workers call CLI
Bash running build/test/lint commands	BLOCKED	Delegate to worker

If a tool call is BLOCKED: STOP. Create a task, spawn a worker.

No exceptions for "simple" tasks. Even a single-file read-and-report MUST go through spawn_agent.

---

Shared Constants

• Session prefix: VA
• Session path: .workflow/.team/VA-<date>-<slug>/
• team_name: visual-a11y
• CLI tools: ccw cli --mode analysis (read-only), ccw cli --mode write (modifications)
• Message bus: mcp__ccw-tools__team_msg(session_id=<session-id>, ...)
• Max GC rounds: 2

Worker Spawn Template

Coordinator spawns workers using this template:

spawn_agent({
  agent_type: "team_worker",
  task_name: "<task-id>",
  fork_turns: "none",
  message: `## Role Assignment
role: <role>
role_spec: <skill_root>/roles/<role>/role.md
session: <session-folder>
session_id: <session-id>
requirement: <task-description>
inner_loop: <true|false>

Read role_spec file (<skill_root>/roles/<role>/role.md) to load Phase 2-4 domain instructions.

## Task Context
task_id: <task-id>
title: <task-title>
description: <task-description>
pipeline_phase: <pipeline-phase>

## Upstream Context
<prev_context>`
})

Parallel Fan-in Spawn (3 Auditors)

The 3 auditors run in parallel. Spawn all 3, then wait for all 3:

// Spawn 3 auditors in parallel
spawn_agent({
  agent_type: "team_worker",
  task_name: "COLOR-001",
  fork_turns: "none",
  message: `## Role Assignment
role: color-auditor
role_spec: ${skillRoot}/roles/color-auditor/role.md
session: ${sessionFolder}
session_id: ${sessionId}
requirement: ${colorTaskDescription}
inner_loop: false

Read role_spec file to load Phase 2-4 domain instructions.

## Task Context
task_id: COLOR-001
title: OKLCH Color Contrast Audit
description: ${colorTaskDescription}
pipeline_phase: audit`
})

spawn_agent({
  agent_type: "team_worker",
  task_name: "TYPO-001",
  fork_turns: "none",
  message: `## Role Assignment
role: typo-auditor
role_spec: ${skillRoot}/roles/typo-auditor/role.md
session: ${sessionFolder}
session_id: ${sessionId}
requirement: ${typoTaskDescription}
inner_loop: false

Read role_spec file to load Phase 2-4 domain instructions.

## Task Context
task_id: TYPO-001
title: Typography Readability Audit
description: ${typoTaskDescription}
pipeline_phase: audit`
})

spawn_agent({
  agent_type: "team_worker",
  task_name: "FOCUS-001",
  fork_turns: "none",
  message: `## Role Assignment
role: focus-auditor
role_spec: ${skillRoot}/roles/focus-auditor/role.md
session: ${sessionFolder}
session_id: ${sessionId}
requirement: ${focusTaskDescription}
inner_loop: false

Read role_spec file to load Phase 2-4 domain instructions.

## Task Context
task_id: FOCUS-001
title: Focus & Keyboard Accessibility Audit
description: ${focusTaskDescription}
pipeline_phase: audit`
})

// Wait for ALL 3 auditors to complete
wait_agent({ timeout_ms: 1800000 })  // 30 min — apply timeout cascade if timed_out

// Close all 3
close_agent({ target: "COLOR-001" })
close_agent({ target: "TYPO-001" })
close_agent({ target: "FOCUS-001" })

// Then spawn remediation-planner with all 3 audit results as upstream context

After spawning, use wait_agent({ timeout_ms: 1800000 }) to collect results. If result.timed_out, send STATUS_CHECK via followup_task (wait 3 min), then FINALIZE with interrupt (wait 3 min), then mark timed_out and close agents. Use close_agent({ target }) each worker.

Model Selection Guide

Visual accessibility is a precision pipeline where auditors need thorough analysis and fix-implementer needs careful code changes.

Role	reasoning_effort	Rationale
color-auditor	high	OKLCH calculations, contrast ratio precision
typo-auditor	high	Multi-breakpoint analysis, clamp() validation
focus-auditor	high	ARIA patterns, keyboard navigation completeness
remediation-planner	high	Synthesize 3 audit reports into actionable plan
fix-implementer	medium	Implementation follows defined remediation plan

Audit-to-Remediation Context Flow

All 3 audit findings must reach remediation-planner via coordinator's upstream context:

// After COLOR-001 + TYPO-001 + FOCUS-001 all complete, coordinator sends findings to planner
spawn_agent({
  agent_type: "team_worker",
  task_name: "REMED-001",
  fork_turns: "none",
  message: `## Upstream Context
Color audit: <session>/audits/color/color-audit-001.md
Typography audit: <session>/audits/typography/typo-audit-001.md
Focus audit: <session>/audits/focus/focus-audit-001.md`
})

User Commands

Command	Action
check / status	View execution status graph
resume / continue	Advance to next step

Specs Reference

• specs/pipelines.md -- Pipeline definitions and task registry
• specs/oklch-standards.md -- OKLCH color accessibility rules
• specs/wcag-matrix.md -- WCAG 2.1 criteria matrix
• specs/typography-scale.md -- Typography accessibility rules
• specs/focus-patterns.md -- Focus management patterns

Session Directory

.workflow/.team/VA-<date>-<slug>/
+-- .msg/
|   +-- messages.jsonl         # Team message bus
|   +-- meta.json              # Pipeline config + GC state
+-- audits/
|   +-- color/                 # Color auditor output
|   |   +-- color-audit-001.md
|   +-- typography/            # Typography auditor output
|   |   +-- typo-audit-001.md
|   +-- focus/                 # Focus auditor output
|       +-- focus-audit-001.md
+-- remediation/               # Remediation planner output
|   +-- remediation-plan.md
+-- fixes/                     # Fix implementer output
|   +-- fix-summary-001.md
+-- re-audit/                  # Re-audit output (GC loop)
|   +-- color-audit-002.md
|   +-- focus-audit-002.md
+-- evidence/                  # Screenshots, traces

v4 Agent Coordination

Message Semantics

Intent	API	Example
Queue supplementary info (don't interrupt)	send_message	Send audit findings to running remediation-planner
Assign new work from reviewed plan	followup_task	Assign FIX task after remediation plan ready
Check running agents	list_agents	Verify agent health during resume

Agent Health Check

Use list_agents({}) in handleResume and handleComplete:

// Reconcile session state with actual running agents
const running = list_agents({})
// Compare with tasks.json active tasks
// Reset orphaned tasks (in_progress but agent gone) to pending

Named Agent Targeting

Workers are spawned with task_name: "<task-id>" enabling direct addressing:

• send_message({ target: "REMED-001", message: "..." }) -- send additional audit findings to remediation-planner
• followup_task({ target: "FIX-001", message: "..." }) -- assign implementation from remediation plan
• close_agent({ target: "COLOR-001" }) -- cleanup after color audit

Error Handling

Scenario	Resolution
Unknown command	Error with available command list
Role not found	Error with role registry
Session corruption	Attempt recovery, fallback to manual
Fast-advance conflict	Coordinator reconciles on next callback
Completion action fails	Default to Keep Active
GC loop stuck > 2 rounds	Escalate to user: accept / retry / terminate
Chrome DevTools unavailable	Degrade to static analysis only