create_reddit_target_group

Create a new Reddit target group with name and targeting criteria (communities, interests, keywords, location).

PREREQUISITE: All references MUST come from search_reddit_criteria. estimate_target_group with channel="REDDIT" first is MANDATORY: verify isMatchCountTooSmall=false and report the reach to the user BEFORE creating. Same bar as create_target_group and update_target_group (PRD-31759). Reddit estimation went live with PRD-31996; before it there was no way to size one of these, which is why a Reddit target group could be created at zero reach with nothing noticing.

USE FOR: "create a Reddit target group named X targeting r/technology", "save this Reddit audience as X".

⚠️ CHANNEL: Only use this tool when the user explicitly asked for a REDDIT target group. Do NOT infer REDDIT from the underlying audience NAMES (e.g. an audience called "Reddit Conquest Mktg LI_n7q" does NOT mean the user wants a REDDIT target group — audience naming is human convention, not a routing signal). Default to `create_target_group` (LINKEDIN) when channel is unspecified; ask the user if unsure.

TARGETING STRUCTURE (LOCATION must be the FIRST include block with isModifiable=false):
{
  "include": [
    {
      "isModifiable": false,
      "criteria": [{"type": "LOCATION", "data": {
        "countries": [229],
        "states": []
      }}],
      "audiences": []
    },
    {
      "isModifiable": true,
      "criteria": [{"type": "COMMUNITIES", "data": [
        {"externalId": "t5_2qh1i", "name": "r/technology"}
      ]}],
      "audiences": []
    }
  ],
  "exclude": {
    "isModifiable": true,
    "criteria": [{"type": "KEYWORDS", "data": [{"externalId": "kw_123", "name": "crypto"}]}],
    "audiences": []
  }
}

REDDIT CRITERIA TYPES (all references from search_reddit_criteria):
- LOCATION: {"countries": [<id>, ...], "states": [<id>, ...]} — arrays of NUMERIC Metadata IDs (use the numeric `id` from search_reddit_criteria locations, NOT the {id, name} object). MANDATORY FIRST in include, isModifiable=false
- COMMUNITIES: Array of {externalId, name} — subreddits (e.g. r/technology)
- INTERESTS: Array of {externalId, name} — Reddit interest categories
- KEYWORDS: Array of {externalId, name} — contextual keywords

INCLUDE: Array of rule blocks (AND-joined). EXCLUDE: single object with `criteria` and `audiences`.

AUDIENCES (combine with the criteria above to build complex target groups): each include
block and the exclude object also accept an `audiences` array, so you can mix existing
Metadata audiences with the Reddit criteria in the same block. Get them from the audience
listing tools / get_matched_audiences. Each audience entry: {mdAudienceId, name, type,
matchCount, matchCountType: "FIXED_SIZE", inactive, criteria: [the audience's own criteria]}.
`mdAudienceId` MUST be the numeric Custom Audience ID (integer, e.g. 49067), NEVER the
audience name string; the platform's `mdAudienceId` is typed `Long` and the tool rejects
non-integer values pre-flight. In the exclude block, use the EXCLUDE variant of the type
(e.g. RETARGETING_EXCLUDE).

RESPONSE: {id, name, channel, audienceSize, status, createdDate, targeting}

WORKFLOW: search_reddit_criteria → build targeting (LOCATION first) → confirm → create_reddit_target_group