Synter

Synter — Claude Code plugin

The AI Agent Operator for Ads. Claude Code for advertising. You direct, the agents execute.

Connect every ad platform, build audiences from signals and first-party data, generate on-brand creative, plan and launch cross-platform campaigns, and reallocate spend by ROAS — all in one conversation. Nothing that spends money ships without your approval.

One interface. Every ad platform. Ship faster.

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Install

In Claude Code:

/plugin marketplace add Synter-Media-AI/plugin
/plugin install synter@synter

When enabling, paste your Synter API key (syn_...) — or leave it blank and run /synter:quickstart to onboard and get one. Create a key at syntermedia.ai/developer.

Free GA4 and onboarding tools work with no key and no credits.

Requires Claude Code with plugin support. US data; campaign write actions spend real money — every spend asks for your approval first.

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What's in the box

This plugin packages agents, skills, an MCP server, a hook, and an output style — the same shape as the Watt Data plugin, built for Synter.

Skills — /synter:*

Command	Does
/synter:quickstart	Onboard, connect a platform, run a first action.
/synter:connect	Link ad platforms and GA4 — Google, Meta, LinkedIn, Microsoft, Reddit, TikTok, X, Amazon, and more.
/synter:audience	Build ABM lists, lookalikes, and signal-based segments; activate them.
/synter:creative	Generate on-brand images, video, UGC, and ad copy.
/synter:launch	Plan, preflight, and ship a cross-platform campaign.
/synter:optimize	Cut wasted spend, scale winners, reallocate budget by ROAS.
/synter:report	Cross-channel performance report and exec summary.
/synter:help	What Synter can do, and where to get support.

Craft skills

Bundled alongside the workflows is a library of advertising-craft knowledge skills Claude pulls in automatically when the task fits:

ad-policy-compliance · anomaly-detector · campaign-preflight · campaign-structure-auditor · creative-fatigue-detector · executive-reporting · landing-page-creation · mmm-budget-planner · roas-calculator

(Internal runbooks, Synter's proprietary operating playbooks, and anything that names internal infrastructure are intentionally not shipped — this plugin acts through the Synter MCP, not bundled scripts.)

Agents — /agents

campaign-strategist · media-buyer · audience-builder · creative-director · budget-optimizer · performance-analyst

They run automatically when the task fits, or call one directly.

MCP server

The Synter Advertising Platform MCP (https://mcp.syntermedia.ai) — cross-platform campaign read/write, creative generation, audiences, attribution, and GA4. Tools register automatically once the plugin is enabled.

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Structure

plugin/
├── .claude-plugin/
│   ├── plugin.json          # manifest + userConfig (API key)
│   └── marketplace.json     # one-plugin marketplace
├── .mcp.json                # Synter MCP (HTTP, key via userConfig header)
├── skills/                  # /synter:* slash commands (SKILL.md each)
├── agents/                  # subagent definitions
├── hooks/hooks.json         # SessionStart safety + voice primer
├── scripts/session-context.sh
├── context/brand-and-safety.md
├── output-styles/synter.md
├── sdk/                     # headless Claude Agent SDK runner
│   ├── synter-agent.mjs
│   └── README.md
├── CHANGELOG.md
└── LICENSE                  # MIT

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Run it headlessly — Claude Agent SDK

A ready-to-run agent harness lives in sdk/. It loads this plugin with the SDK and runs the Synter operator unattended — read-only by default (spend/mutation is auto-denied with no human to approve). Good for cron digests, pipelines, or embedding.

cd sdk && npm install
SYNTER_API_KEY=syn_... node synter-agent.mjs "/synter:report last 7 days"

See sdk/README.md for the safety model, --allow-writes, and the Python equivalent.

Under the hood it's just:

import { query } from "@anthropic-ai/claude-agent-sdk";
for await (const m of query({
  prompt: "/synter:report last 7 days",
  options: { plugins: [{ type: "local", path: "/path/to/plugin" }] },
})) { /* skills, agents, hooks, MCP all loaded */ }

Or wire the MCP straight into any client

HTTP (recommended)

{
  "mcpServers": {
    "synter": {
      "type": "http",
      "url": "https://mcp.syntermedia.ai",
      "headers": { "X-Synter-Key": "syn_your_api_key_here" }
    }
  }
}