{
  "slug": "dagger-module-container-arguments-accept-default-addresses-5aeac23ec550",
  "title": "Dagger module Container arguments accept default addresses",
  "tools": [
    "dagger"
  ],
  "tags": [
    "agent"
  ],
  "introduced_at": "2026-02-05T23:50:53.000Z",
  "announced_at": "2026-02-05T23:50:53.000Z",
  "effective_at": null,
  "date_basis": "source-publication",
  "status": "unknown",
  "how": {
    "incantation": "When a Dagger Function takes a `Container` argument, set its `defaultAddress` so Dagger loads that image when the caller omits the argument. An explicitly supplied argument value overrides the default.",
    "examples": [
      "// +defaultAddress=\"alpine:latest\"\nctr *dagger.Container,",
      "{\n  \"function\": [\"testWithDefaultContainer\"],\n  \"argument\": \"ctr\",\n  \"defaultAddress\": \"alpine:3.18\"\n}"
    ],
    "gotchas": [
      "Version: v0.19.11",
      "defaultAddress (required): The container image address to load when this `Container` argument is not set; an explicitly passed argument overrides it.",
      "function (required): JSON customization field identifying the function by name; shown as an array containing `testWithDefaultContainer`.",
      "argument (required): JSON customization field naming the argument that receives the default address; shown as `ctr`.",
      "Prerequisite: The function argument must be of type `Container`; default addresses are only available for `Container` arguments.",
      "Default addresses are only available for `Container` arguments.",
      "An explicitly passed value overrides the default address."
    ]
  },
  "why_it_matters": "Provide a default base image for a Container argument used by a repository build or test function.",
  "sources": [
    "https://github.com/dagger/dagger/releases/tag/v0.19.11",
    "https://github.com/dagger/dagger/pull/11714",
    "https://docs.dagger.io/0.19.11/getting-started/types/container/#default-addresses"
  ],
  "rank": 0.97038,
  "judge": {
    "publish": true,
    "judge_model": "codex-cli/gpt-6-luna+typesafe/jev-1.13.0",
    "prompt_version": "extract-v7+enrich-v2+judge-v2x3+jev-publish-v1"
  },
  "review_state": "approved",
  "provenance": {
    "run_id": "wave2a-20261017",
    "verdict_id": "wave2a-20261017:wave2a-20261017-454373f66e502c27-6:gate",
    "evidence_hash": "dcb281f002c1b9c67aedef0c68645f862ce8cfddb9419cd993190ce0596a32bf"
  },
  "review": {
    "draft_hash": "39e18f512b5af13ea6838c34f983dee8be5357b43635a82c429011c5258230d7",
    "reviewer": "publication-gate",
    "reviewed_at": "2026-10-07T00:00:00.000Z",
    "decision": "wave2a-20261017:gate",
    "reason": "3 of 3 judge runs approved with p_yes >= 0.9 (mean 0.97 >= 0.9; 2 needed) and Jev gave 0.78 (>= 0.6 needed)."
  }
}