auditing-workspaces

name	auditing-workspaces
description	Audit Excalidraw workspaces and canvases to detect orphaned workspaces, tombstone-heavy canvases, and cache/disk mismatches. Use when workspaces are piling up, sync looks suspicious, or you want to check for stale artifacts before creating new canvases.

auditing-workspaces

Call the whiteboard MCP /api/debug endpoint to inspect workspace, canvas, and cache state. Use it to find old workspaces (hasActivePort=false) and canvases dominated by tombstones, then report them as cleanup candidates.

For the main drawing workflow, see the drawing-visuals skill in skills/drawing-visuals/SKILL.md.

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When To Use It

• When whiteboard has been in heavy use and ~/.whiteboard/ seems bloated
• When you want to verify mechanically that a canvas is probably unused
• When sync behavior looks suspicious and you want to compare cache vs disk state
• Before opening a new canvas, when you want to check for duplicate slugs

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Execution Flow

Step 1: Find The Port For A Running Workspace

In ~/.whiteboard/{workspaceId}/.port, line 1 is the port number and line 2 is the PID. An active workspace has a .port file and a live PID.

# Quick check for running .port files
ls $HOME/.whiteboard/*/.port 2>/dev/null

If multiple workspaces are found, use the most recent one by mtime.

Step 2: Fetch Raw Data From /api/debug

curl -s http://localhost:{PORT}/api/debug | jq .

Response shape:

{
  "sessions": [
    {
      "workspaceId": "...",
      "hasActivePort": true,
      "canvases": [
        {
          "slug": "...",
          "totalElements": 42,
          "visibleElements": 30,
          "tombstones": 12,
          "cached": true
        }
      ]
    }
  ],
  "cache": { "size": 3, "keys": ["sess/slug"] }
}

Step 3: Aggregate From An Audit Perspective

Check the following mechanically:

Concern	Condition	Suggested Action
dead workspace	hasActivePort=false and canvases are not empty	candidate for deleting ~/.whiteboard/{workspaceId}/
tombstone-heavy canvas	tombstones / totalElements >= 0.5 and totalElements >= 10	consider rebuilding with canvas_clear or re-saving from a fresh snapshot
empty canvas	totalElements=0	candidate for deletion
cache leak	present in cache.keys but its workspace has hasActivePort=false	usually fixed by process restart; report it
cache size	cache.size > 20	possible memory pressure; watch long-lived workspaces

Step 4: Write The Report

Keep the user-facing summary short and structured like this:

## whiteboard audit report

Active: {N} workspace / {M} canvas
Old workspaces: {K} candidates
Tombstone-heavy: {slug count}
Empty: {slug count}

### Deletion candidates
- ~/.whiteboard/{workspaceId}/ ({reason})

### Needs review
- {workspaceId}/{slug}: tombstones {T}/{Total} -> consider canvas_clear

Do not delete anything automatically. Always confirm with the user before running rm -rf.

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Notes

• /api/debug is a local-only endpoint. It is unauthenticated, so do not expose it externally
• A canvas with cached=true is currently backed by an in-memory LoroDoc. cached=false means it was read from disk through peekDoc only and did not populate cache
• tombstones count soft-deleted elements. They are part of the CRDT model, so do not delete them directly. If they are a problem, canvas_clear and rebuild is the safe route
• Deleting all of ~/.whiteboard/ destroys all workspace history. Delete only dead workspaces selectively
• If the numbers look wrong, restart the whiteboard MCP server first so doc-cache and filesystem state can resync, then rerun the audit