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Mailjet MCP Integration for LangChain

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

9 functions 7 read 2 write API key auth
Submit Mailjet feedback View package source

Connect Mailjet 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.

Mailjet MCP Config for LangChain

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Mailjet 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.

Mailjet Tools Visible to LangChain

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

MCP toolSource functionTypeDescription
integration__mailjet__mailjet_send_email mailjet.mailjet_send_email Write Send an email via Mailjet. Specify sender, one or more recipients, subject, and HTML body.
integration__mailjet__mailjet_list_contacts mailjet.mailjet_list_contacts Read List contacts in the Mailjet account. Returns paginated contact data including email addresses and metadata.
integration__mailjet__mailjet_get_contact mailjet.mailjet_get_contact Read Get details for a single Mailjet contact by ID or email address.
integration__mailjet__mailjet_create_contact mailjet.mailjet_create_contact Write Create a new contact in Mailjet. Provide the email address to add.
integration__mailjet__mailjet_list_campaigns mailjet.mailjet_list_campaigns Read List email campaigns in the Mailjet account. Returns campaign IDs, subjects, and status.
integration__mailjet__mailjet_get_campaign mailjet.mailjet_get_campaign Read Get details for a single Mailjet email campaign by ID.
integration__mailjet__mailjet_list_templates mailjet.mailjet_list_templates Read List email templates available in the Mailjet account.
integration__mailjet__mailjet_get_stats mailjet.mailjet_get_stats Read Get email statistics from the Mailjet statcounters endpoint. Returns send, delivery, open, click, and bounce counts.
integration__mailjet__mailjet_get_current_user mailjet.mailjet_get_current_user Read Get the authenticated Mailjet user profile information.

Related Mailjet Pages

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