{
  "slug": "wrangler-configures-a-per-workflow-concurrency-limit-5a4224334e5c",
  "title": "wrangler configures a per-workflow concurrency limit",
  "tools": [
    "wrangler"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-08-27T08:19:02.000Z",
  "announced_at": "2026-08-27T08:19:02.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When deploying a Workflow with Wrangler, set `concurrency.limit` to a positive integer in its `workflows[]` entry. The limit is persisted on deploy and enforced server-side; it is ignored in local development.",
    "examples": [
      "{\n  \"workflows\": [\n    {\n      \"binding\": \"MY_WORKFLOW\",\n      \"name\": \"my-workflow\",\n      \"class_name\": \"MyWorkflow\",\n      \"concurrency\": { \"limit\": 10 }\n    }\n  ]\n}"
    ],
    "gotchas": [
      "Version: 4.127.0",
      "workflows[].concurrency.limit: Positive integer maximum number of Workflow instances that can run concurrently. The `concurrency` object is optional; when set, specify `limit`.",
      "The limit is validated as a positive integer.",
      "Concurrency is ignored in local development.",
      "Docs conflict: The current Wrangler configuration page documents Workflow binding fields but does not list `concurrency`; it does not state different behavior. https://developers.cloudflare.com/workers/wrangler/configuration/"
    ]
  },
  "why_it_matters": "Set a maximum number of Workflow instances that can run concurrently for a workflow deployed with Wrangler.",
  "sources": [
    "https://github.com/cloudflare/workers-sdk/releases/tag/wrangler%404.127.0",
    "https://github.com/cloudflare/workers-sdk/releases/tag/wrangler@4.127.0"
  ],
  "rank": 0.96032,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v1+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "augsep-20261008",
    "verdict_id": "augsep-20261008:augsep-20261008-098d8f011279e93e-0:gate",
    "evidence_hash": "e0bc1f8f17e47e07fda0b1c260f48761c6b44496f21a6c1f239610274773ccb4"
  },
  "review": {
    "draft_hash": "c8047dcc543909c17639f3e1ac28ddc0ad8816dbd29581c8055950da080f6350",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "augsep-20261008:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.96 >= 0.9; 2 needed) and Jev gave 0.80 (>= 0.6 needed)."
  }
}