Configuration

MCP Client Setup

Claude DesktopKiroGemini CLI / Other

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "play-store": {
      "command": "uvx",
      "args": ["play-store-mcp"],
      "env": {
        "GOOGLE_APPLICATION_CREDENTIALS": "/path/to/service-account.json"
      }
    }
  }
}

Add to .kiro/settings/mcp.json:

{
  "mcpServers": {
    "play-store": {
      "command": "uvx",
      "args": ["play-store-mcp"],
      "env": {
        "GOOGLE_APPLICATION_CREDENTIALS": "/path/to/service-account.json"
      }
    }
  }
}

Most MCP clients use the same configuration format:

{
  "mcpServers": {
    "play-store": {
      "command": "uvx",
      "args": ["play-store-mcp"],
      "env": {
        "GOOGLE_APPLICATION_CREDENTIALS": "/path/to/service-account.json"
      }
    }
  }
}

Docker

docker run -e GOOGLE_APPLICATION_CREDENTIALS=/creds/key.json \
  -v /path/to/service-account.json:/creds/key.json:ro \
  ghcr.io/lusky3/play-store-mcp:latest

For HTTP transport with Docker:

docker run -p 8000:8000 \
  -e GOOGLE_APPLICATION_CREDENTIALS=/creds/key.json \
  -v /path/to/service-account.json:/creds/key.json:ro \
  ghcr.io/lusky3/play-store-mcp:latest \
  --transport streamable-http --host 0.0.0.0 --port 8000

Environment Variables

Variable	Description	Required	Default
GOOGLE_APPLICATION_CREDENTIALS	Path to service account JSON key file	Yes (or use per-request credentials)	—
GOOGLE_PLAY_STORE_CREDENTIALS	Inline JSON credentials string	Alternative to file path	—
PLAY_STORE_MCP_LOG_LEVEL	Log level: DEBUG, INFO, WARNING, ERROR	No	INFO
PLAY_STORE_MCP_DISABLE_DNS_REBINDING	Disable DNS rebinding protection (for cloud/reverse-proxy deployments)	No	—
PLAY_STORE_MCP_ADMIN_TOKEN	Require Authorization: Bearer <token> on the /credentials endpoint (needed behind a reverse proxy, where the localhost check is insufficient)	No	—
PLAY_STORE_MCP_READ_ONLY	Disable all write operations	No	—
PLAY_STORE_MCP_DOWNLOAD_DIR	Directory that APK/AAB downloads are confined to (guards against path traversal / arbitrary-file overwrite). Downloads are always confined; a destination outside this directory is rejected. Required for network transports (sse/streamable-http); optional for stdio, where it defaults to the current working directory.	Required for network transports	cwd
CODE_MODE	Enable the experimental code-mode transform (opt-in; requires the code-mode extra)	No	off

HTTP Transport

For remote access or public deployments:

play-store-mcp --transport streamable-http --host 0.0.0.0 --port 8000

The server exposes a /health endpoint for monitoring.

See Remote Credentials for per-request credential configuration.

Per-Request Credentials

For multi-tenant deployments, clients can pass their own Google service account credentials on each request via HTTP headers. This is the primary mechanism for public instances where each user brings their own credentials.

Header	Description
X-Google-Credentials-Base64	Base64-encoded service account JSON key (recommended)
X-Google-Credentials	Raw JSON service account key string

To encode your credentials:

base64 -w 0 < service-account.json

Configure your MCP client to send the header:

{
  "mcpServers": {
    "play-store": {
      "url": "https://your-server.com/mcp",
      "transport": "http",
      "headers": {
        "X-Google-Credentials-Base64": "YOUR_BASE64_ENCODED_CREDENTIALS"
      }
    }
  }
}

Per-request credentials are isolated — each request uses only the credentials provided in its headers. This isolation applies only to the per-request header path. If you also configure a server-side fallback (the GOOGLE_PLAY_STORE_CREDENTIALS env var, or a /credentials POST), that fallback client is process-global and is shared by every request that does not send a credential header — such a request executes under the shared identity rather than failing. For multi-tenant or public deployments, do not configure fallback credentials, so a request missing its credential header fails closed instead of using another identity.

Read-Only Mode

Enable read-only mode to guarantee the server performs no writes against the Play Developer API — useful for demos, audits, or pointing at a production app. When active, all write/mutating tools (deploy, promote, rollout control, review replies, listing/tester updates, catalog create/update/delete, purchase management, uploads, etc.) return an error and never contact the API; all read and validation tools work normally.

Enable it with the CLI flag:

play-store-mcp --read-only

Or the environment variable (truthy values: 1, true, yes, on):

export PLAY_STORE_MCP_READ_ONLY=1

Code Mode (Experimental)

Experimental — off by default

Code mode is opt-in and disabled by default. It wraps the tool surface in FastMCP's experimental code-mode transform.

Code mode replaces the individual tools with three meta-tools — search, get_schema, and execute — so the client discovers tools on demand and runs a short script that calls them in a sandbox, rather than receiving the full tool list on every request. This cuts the per-request tool-list token overhead.

Pair with read-only unless you need writes

Under code mode a single execute call can invoke up to 50 tool calls — including mutating operations (deploy_app, refund_order, delete_*, batch_*) — behind one approval, rather than the client approving each call. Read-only enforcement still applies inside the sandbox, so if the deployment does not need writes, run code mode with --read-only / PLAY_STORE_MCP_READ_ONLY=1 to block those operations.

Enabling it requires two things:

1. Install the sandbox extra (the execute meta-tool runs in the Monty sandbox):

   pip install "play-store-mcp[code-mode]"
   # or: uvx --from "play-store-mcp[code-mode]" play-store-mcp
   

2. Set the environment variable (truthy values: 1, true, yes, on):

   export CODE_MODE=1
   

CODE_MODE is an environment variable only — there is no CLI flag — because the transform is fixed when the server is constructed (before command-line arguments are parsed). When it is unset, the classic full tool surface is served unchanged.

Logging

Logs are written to stderr (stdout is reserved for MCP JSON-RPC communication). The server uses structlog for structured logging.

To enable debug logging:

export PLAY_STORE_MCP_LOG_LEVEL=DEBUG

Or set it in your MCP client config:

{
  "mcpServers": {
    "play-store": {
      "command": "uvx",
      "args": ["play-store-mcp"],
      "env": {
        "GOOGLE_APPLICATION_CREDENTIALS": "/path/to/service-account.json",
        "PLAY_STORE_MCP_LOG_LEVEL": "DEBUG"
      }
    }
  }
}

Retry Behavior

The client automatically retries failed API calls with exponential backoff:

• Retries on HTTP 429 (rate limit), 500, and 503 errors
• Maximum 3 retries per request
• Backoff starts at 1 second, doubles each retry (max 32 seconds)
• Random jitter is added to prevent thundering herd

Docker Environment Variables

When running in Docker, the following additional environment variables control the MCP transport:

Variable	Description	Default
MCP_TRANSPORT	Transport mode: stdio, sse, or streamable-http	stdio
MCP_HOST	Host address to bind to	0.0.0.0
MCP_PORT	Port to listen on	8000

Note: MCP_HOST and MCP_PORT only apply when using a network transport (streamable-http or sse). The Dockerfile defaults to stdio.