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](roles/typo-auditor/role.md) | TYPO- | false | | focus-auditor | roles/focus-auditor/role.md | FOCUS- | false | | remediation-planner | [roles/remediation-planner/role.md](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:

javascript
// 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 |