---
name: task-graph
description: >
  Multi-agent coordination protocol for hmwebviewer. Load when picking up work,
  dispatching agents, or reporting progress. Explains how PLAN.md and PROGRESS.md
  drive parallel agent work and the exact update rules.
---

# hmwebviewer — multi-agent task-graph protocol

`PLAN.md` = the backlog (what to do). `PROGRESS.md` = the log (what happened). CLAUDE.md mandates reading both on every agent start.

## Picking a task
1. Read `PLAN.md` task tables.
2. Find rows with status `todo` whose entire `depends_on` list is `done`.
3. Among those, pick by wave (see PLAN.md "Parallelization map") or by the task's `Agent` column.
4. Before working: flip status to `in_progress(@yourname)` in PLAN.md.

## Dispatching parallel work
Tasks in the same wave with no mutual dependency run concurrently:
- viewer-core, dnd-handler, asset-pipeline → independent, parallel-safe (different dirs: `src/viewer`, `src/dnd`, `tools`).
- hydration depends on viewer-core signals → run after.
- reviewer → last / on-demand.

Spawn each via the Agent tool in ONE message with multiple calls so they run concurrently. Pass every agent: task ID, file scope, acceptance criteria, pointer to PLAN.md.

## Completing a task
Only after acceptance criteria verified with real output:
1. Flip the PLAN.md row to `done`.
2. Append a `## YYYY-MM-DD — <task>` entry to PROGRESS.md top of Work log (Did / Result / Next / Blocker).
3. If a decision was made, add to PROGRESS.md "Decision log" and (if durable) to user memory.

## Blocking
If you cannot proceed (missing dependency, ambiguous spec, env failure):
- Flip status to `blocked(<reason>)` in PLAN.md.
- Append PROGRESS.md entry with the blocker.
- Stop. Do not guess around a real blocker.

## Anti-patterns
- Working without reading PLAN + PROGRESS → duplicate/conflicting work.
- Marking done without verification → silent regressions.
- Editing outside your task's file scope → steps on another agent.
- Creating parallel loaders/state instead of using the shared singleton → crashes.