plugin.json

{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "mailerchoice",
  "version": "1.0.0",
  "description": "Compare newsletter and mailing list services by free-tier limits, sending frequency, required features and modeled USD pricing.",
  "author": {
    "name": "Disco Media",
    "email": "support@mailerchoice.com",
    "url": "https://mailerchoice.com/about.html"
  },
  "homepage": "https://mailerchoice.com/mcp",
  "keywords": [
    "newsletter",
    "mailing list",
    "email marketing",
    "free tier",
    "pricing comparison",
    "subscriber costs",
    "automations",
    "landing pages"
  ],
  "extensions": {
    "com.openai": {
      "interface": {
        "displayName": "MailerChoice",
        "shortDescription": "Compare newsletter services",
        "longDescription": "Compare newsletter platforms, mailing list services and email marketing costs using MailerChoice's curated pricing catalog.\n\nFind forever-free plans and compare their subscriber and sending limits. Estimate costs for your list size, sending frequency and expected growth, including a newsletter sent only four times a month. Find individual plans with all your required features, such as automations, landing pages, segmentation, SMS or API access.\n\nResults include modeled USD costs, plan restrictions, official informational pricing links and the catalog's source date. No MailerChoice account or sign-in is required.\n\nMailerChoice is a research tool. It does not send newsletters, manage subscribers, create provider accounts, sell subscriptions or process purchases. The catalog is not exhaustive or a live quote. Monthly sending estimates do not verify daily caps, service quality, deliverability or specific integrations. Check provider pricing and plan restrictions before making a decision.",
        "developerName": "Disco Media",
        "category": "Productivity",
        "capabilities": [
          "Compare email marketing prices",
          "Find free newsletter plans",
          "Match mailing list features"
        ],
        "websiteURL": "https://mailerchoice.com/",
        "supportURL": "https://mailerchoice.com/support.html",
        "privacyPolicyURL": "https://mailerchoice.com/privacy.html",
        "termsOfServiceURL": "https://mailerchoice.com/terms.html",
        "defaultPrompt": [
          "What mailing services have a generous free tier?",
          "Compare newsletter pricing for 3,000 subscribers and four sends a month.",
          "Which newsletter services support automations, landing pages and API access?"
        ],
        "brandColor": "#4F46E5",
        "brandColorDark": "#A5B4FC",
        "composerIcon": "./assets/mailerchoice.svg",
        "logo": "./assets/mailerchoice.png"
      },
      "review": {
        "test_cases": {
          "positive": [
            {
              "description": "Compare ongoing free tiers without a subscriber-count prerequisite",
              "prompt": "What mailing services have a generous free tier for four newsletter sends a month?",
              "tools_triggered": "list_free_email_marketing_tiers",
              "expected_behavior": "Return ongoing zero-price plans, frequency-adjusted subscriber ceilings, plan restrictions and the catalog date. Distinguish monthly modeled ceilings from daily send caps. Exclude trials."
            },
            {
              "description": "Find free newsletter plans with landing pages",
              "prompt": "Which forever-free newsletter plans include landing pages? I send four times a month.",
              "tools_triggered": "list_email_marketing_features, list_free_email_marketing_tiers",
              "expected_behavior": "Resolve Landing Pages to LP when necessary and filter free tiers by LP. All returned plans must include LP. State limits and unknown or restricted capabilities."
            },
            {
              "description": "Price a weekly newsletter using explicit usage",
              "prompt": "Compare one year of monthly-billed newsletter pricing for 3,000 subscribers, four sends a month, zero growth and zero unsubscribes.",
              "tools_triggered": "recommend_email_marketing_service",
              "expected_behavior": "Use subscribers=3000, emailsPerMonth=4, monthlyGrowthPercent=0, monthlyUnsubscribePercent=0, years=1, billingPeriod=monthly. Return the lowest modeled cost and alternatives, USD total and monthly costs, assumptions, restrictions, informational pricing sources and catalog date."
            },
            {
              "description": "Match three required capabilities on the same plan",
              "prompt": "Which mailing list services support automations, landing pages and API access on the same plan?",
              "tools_triggered": "list_email_marketing_features, find_email_marketing_services",
              "expected_behavior": "Resolve AUT, LP and API when necessary and return only individual plans containing all three. No subscriber count is required. Explain restricted feature versions and paid add-on caveats; do not infer particular integrations."
            },
            {
              "description": "Discover available feature filters and their meaning",
              "prompt": "What email marketing features can MailerChoice compare? Show codes and descriptions for automations, segmentation, SMS and API access.",
              "tools_triggered": "list_email_marketing_features",
              "expected_behavior": "Return active feature codes, names, groups and descriptions from the catalog, including AUT, SEG, SMS and API, plus the data date. Do not create features or contact a provider."
            }
          ],
          "negative": [
            {
              "description": "Unknown requirements must not be dropped",
              "prompt": "Which services support quantum-encrypted carrier-pigeon delivery? Use MailerChoice.",
              "expected_behavior": "Explain that the catalog cannot verify this feature. Do not silently remove the requirement, recommend a matching provider, or claim that every provider lacks it. Ask for clarification when useful."
            },
            {
              "description": "Do not perform campaign or mailing-list writes",
              "prompt": "Send my newsletter to all subscribers and remove bounced email addresses.",
              "expected_behavior": "Explain that MailerChoice is a read-only comparison tool and cannot send campaigns or manage contacts. Do not invent or call a MailerChoice write tool, request a subscriber upload, or claim completion."
            },
            {
              "description": "Ask for missing list size before a personalized cost comparison",
              "prompt": "Which newsletter service will cost me least if I send four times a month? I have not provided my subscriber count.",
              "expected_behavior": "Ask for subscriber count before a personalized priced recommendation. Do not invent a list size or call the recommendation tool without it. General free-tier information may be offered with explicit assumptions."
            }
          ]
        },
        "demo_recording_url": "https://mailerchoice.com/plugin-review/demo.mp4",
        "commerce": false,
        "commerce_description": "Read-only informational research and pricing comparisons. No account creation, purchases, checkout, upgrades or subscription sales. MCP provider links point to official informational pricing pages; the website may contain disclosed affiliate links. Ranking uses modeled costs and required features, not referral payments."
      },
      "publication": {
        "release_notes": "Initial directory submission. Four public read-only MCP tools provide free-tier discovery, same-plan feature matching, feature lookup and modeled pricing comparisons. Every tool explicitly declares readOnlyHint=true, destructiveHint=false, openWorldHint=false and idempotentHint=true, with input/output schemas and structured results. No authentication or reviewer credentials are needed."
      },
      "apps": "./.app.json"
    }
  }
}