Can I use Mailgun as a CLI?

Yes. KosmoKrator exposes a Mailgun CLI through kosmo integrations:call and the provider shortcut command. Commands can return JSON for scripts, CI, and coding agents.

Can I expose Mailgun through MCP?

Yes. The KosmoKrator MCP gateway can expose selected Mailgun tools to clients such as Claude Code, Cursor, Codex, and other MCP-compatible tools.

Where are Mailgun credentials stored?

Mailgun credentials are configured in KosmoKrator's local integration settings and reused by CLI, Lua, and MCP gateway surfaces.

Can I deny write access for Mailgun MCP tools?

Yes. Start the gateway with --write=deny for read-only clients, or use ask/allow only for trusted workspaces.

communication

Mailgun MCP Integration for LangChain

Connect Mailgun to LangChain through the local KosmoKrator MCP gateway with scoped tools, credentials, and write policy.

7 functions 6 read 1 write API key auth

Submit Mailgun feedback View package source

Connect Mailgun to LangChain

Bridge LangChain agents to local KosmoKrator integration tools through MCP or headless CLI calls.

Use the MCP gateway when the agent should discover tools, or wrap kosmo integrations:call for fixed chains. The gateway is local, scoped to this integration, and starts with --write=deny so LangChain can inspect read-capable tools without receiving write access by default.

Mailgun MCP Config for LangChain

Keep the gateway scoped to the integration and operation class needed by the chain.

{
  "mcpServers": {
    "kosmokrator-mailgun": {
      "type": "stdio",
      "command": "kosmo",
      "args": [
        "mcp:serve",
        "--integration=mailgun",
        "--write=deny"
      ]
    }
  }
}

Run the Gateway Manually

kosmokrator mcp:serve --integration=mailgun --write=deny

Why Use KosmoKrator Here

Scoped tools

Expose only Mailgun instead of a broad multi-service tool list.

Local credentials

Reuse credentials already configured for the KosmoKrator CLI and Lua runtime.

Write policy

Start read-only, then opt into ask or allow for trusted workspaces.

Mailgun Tools Visible to LangChain

LangChain sees stable MCP tool names generated from the Mailgun integration catalog.

MCP tool	Source function	Type	Description
`integration__mailgun__mailgun_get_current_user`	`mailgun.mailgun_get_current_user`	Read	Verify the Mailgun API connection and retrieve basic account info by listing domains.
`integration__mailgun__mailgun_get_domain`	`mailgun.mailgun_get_domain`	Read	Get details and DNS records for a specific Mailgun domain.
`integration__mailgun__mailgun_list_domains`	`mailgun.mailgun_list_domains`	Read	List all domains in your Mailgun account with optional pagination.
`integration__mailgun__mailgun_list_messages`	`mailgun.mailgun_list_messages`	Read	List message events in your Mailgun domain with optional filtering and pagination.
`integration__mailgun__mailgun_list_routes`	`mailgun.mailgun_list_routes`	Read	List all routes in your Mailgun account with optional pagination.
`integration__mailgun__mailgun_list_webhooks`	`mailgun.mailgun_list_webhooks`	Read	List all webhooks configured for a Mailgun domain.
`integration__mailgun__mailgun_send_email`	`mailgun.mailgun_send_email`	Write	Send an email via Mailgun. Specify from, to, subject, and text or HTML content.

Related Mailgun Pages

Mailgun CLIUse direct JSON commands instead of MCP discovery. Mailgun MCPFull gateway reference and MCP tool names. KosmoKrator for LangChainClient-level gateway setup.