Walmart Ads MCP Server

Walmart Connect Advertising APIs

MCP server for Walmart Connect Ads APIs — Sponsored Search and Display.

Exposes two tools — a generic API proxy (walmart_ads_api) and a display-snapshot downloader (walmart_ads_download_display_snapshot). The AI agent decides which endpoint to call; the server handles RSA-SHA256 signing and auth headers automatically.

Features

• One tool, any endpoint — no code changes needed when APIs evolve
• Supports both Sponsored Search and Display API families
• Multi-region, multi-environment (production + staging) via config file
• Per-request RSA-SHA256 signing with automatic header construction
• Large responses truncated with full data available via MCP resource URI
• Bundled API reference docs served as MCP resources so the agent knows endpoint schemas

Requirements

• Python 3.13+
• Walmart Connect Partner Network credentials (consumer ID, RSA key pair, bearer token)

Quick start

Set up your config (see Configuration), then run the server:

# Run directly with uvx (no clone needed)
npx -y @modelcontextprotocol/inspector uvx mcp-walmart-ads

# Or run from source
git clone https://github.com/alyiox/mcp-walmart-ads.git
cd mcp-walmart-ads
uv sync
npx -y @modelcontextprotocol/inspector uv run mcp-walmart-ads

Configuration

The config file lives under your home directory at ~/.config/mcp-walmart-ads/config.json.

Windows note: ~ maps to %USERPROFILE% (typically C:\Users\<you>), so the full path is %USERPROFILE%\.config\mcp-walmart-ads\config.json.

1. Create the config directory and copy the example

# Unix-like (macOS, Linux, WSL, …)
mkdir -p ~/.config/mcp-walmart-ads/keys/us
cp config.example.json ~/.config/mcp-walmart-ads/config.json

# Windows (PowerShell)
New-Item -ItemType Directory -Force "$env:USERPROFILE\.config\mcp-walmart-ads\keys\us"
Copy-Item config.example.json "$env:USERPROFILE\.config\mcp-walmart-ads\config.json"

2. Edit ~/.config/mcp-walmart-ads/config.json

{
  "response_cache_ttl": 3600,
  "truncate_threshold": 51200,
  "regions": {
    "US": {
      "production": {
        "consumer_id": "your-consumer-id",
        "private_key": "./keys/us/prod.pem",
        "private_key_version": "1",
        "bearer_token": "your-bearer-token",
        "base_urls": {
          "search": "https://developer.api.walmart.com/api-proxy/service/WPA/Api/v1",
          "display": "https://developer.api.walmart.com/api-proxy/service/display/api/v1"
        }
      },
      "staging": {
        "consumer_id": "your-staging-consumer-id",
        "private_key": "./keys/us/staging.pem",
        "private_key_version": "1",
        "bearer_token": "your-staging-bearer-token",
        "base_urls": {
          "search": "https://developer.api.stg.walmart.com/api-proxy/service/WPA/Api/v1",
          "display": "https://developer.api.us.stg.walmart.com/api-proxy/service/display/api/v1"
        }
      }
    }
  }
}

3. Place your RSA private key PEM files in ~/.config/mcp-walmart-ads/keys/

Key paths in the config are resolved relative to the config directory, so ./keys/us/prod.pem resolves to ~/.config/mcp-walmart-ads/keys/us/prod.pem.

Tools

walmart_ads_api

Execute any Walmart Connect Ads API endpoint. The agent picks the method and path; the server handles RSA-SHA256 signing.

walmart_ads_download_display_snapshot

Download a display snapshot file (report or entity). Display snapshot URLs require authenticated requests, so this tool handles the signing automatically. Use it with the snapshot ID from the details field after polling a display snapshot to done status.

MCP resources

API reference docs

The server bundles API reference docs as MCP resources so the agent can read endpoint schemas on demand. One resource per endpoint group, following the URI pattern wmc://docs/{ad_type}/{group} — for example wmc://docs/search/campaigns or wmc://docs/display/audiences.

The full list is generated from the markdown files in src/mcp_walmart_ads/docs/. Current groups:

Dynamic resources

MCP host examples

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "walmart-ads": {
      "command": "uvx",
      "args": ["mcp-walmart-ads"]
    }
  }
}

Claude Code

Add to your Claude Code MCP config:

{
  "mcpServers": {
    "walmart-ads": {
      "command": "uvx",
      "args": ["mcp-walmart-ads"]
    }
  }
}

Codex

[mcp_servers.walmart-ads]
command = "uvx"
args = ["mcp-walmart-ads"]

OpenCode

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "walmart-ads": {
      "type": "local",
      "enabled": true,
      "command": ["uvx", "mcp-walmart-ads"]
    }
  }
}

GitHub Copilot

{
  "inputs": [],
  "servers": {
    "walmart-ads": {
      "type": "stdio",
      "command": "uvx",
      "args": ["mcp-walmart-ads"]
    }
  }
}

Development

uv sync --group dev    # install deps
uv run pytest          # run tests
uv run ruff check .    # lint
uv run ruff format .   # format
uv run pyright         # type check

Contributing

Open issues or PRs. Follow existing style and add tests where appropriate.

License

MIT. See LICENSE.