{
  "slug": "wrangler-custom-build-commands-receive-wrangler-command-e3e6c955da77",
  "title": "wrangler custom build commands receive WRANGLER_COMMAND",
  "tools": [
    "wrangler"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-02-10T09:22:52.000Z",
  "announced_at": "2026-02-10T09:22:52.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When Wrangler runs a configured custom build command, branch on `WRANGLER_COMMAND` to select the build behavior for `dev`, `deploy`, `versions upload`, or `types`.",
    "examples": [
      "[build]\ncommand = \"./build.sh\"",
      "if [ \"$WRANGLER_COMMAND\" = \"dev\" ]; then\n  echo \"Building for development...\"\nelse\n  echo \"Building for production...\"\nfi"
    ],
    "gotchas": [
      "Version: 4.64.0",
      "build.command: Command used to build the Worker; it runs as part of Wrangler commands that trigger the custom build.",
      "WRANGLER_COMMAND: Environment variable set for the custom build; values documented are `dev`, `deploy`, `versions upload`, and `types`.",
      "Prerequisite: Configure a custom build command in the Wrangler configuration file.",
      "The variable applies when using a custom build command in `wrangler.toml`."
    ]
  },
  "why_it_matters": "Branch a custom build script on whether Wrangler invoked it for development, deployment, versions upload, or types.",
  "sources": [
    "https://github.com/cloudflare/workers-sdk/releases/tag/wrangler%404.64.0",
    "https://developers.cloudflare.com/workers/wrangler/custom-builds/"
  ],
  "rank": 0.93034,
  "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": "recover-20261008",
    "verdict_id": "recover-20261008:recover-20261008-3dbb50da4910c71b-6:gate",
    "evidence_hash": "1a3c22db0b52d55b2066afffc9a3047528dd47c96383597b2d4a53729190dc8d"
  },
  "review": {
    "draft_hash": "a16570834d06292c9ca4acf50e4e5bdedce0d580ccf8b93a94c84d3a879b2102",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "recover-20261008:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.93 >= 0.9; 2 needed) and Jev gave 0.73 (>= 0.6 needed)."
  }
}