Can I use Gmail as a CLI?

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

Can I expose Gmail through MCP?

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

Where are Gmail credentials stored?

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

Can I deny write access for Gmail MCP tools?

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

communication

Gmail MCP Integration for LangChain

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

16 functions 9 read 7 write OAuth browser flow auth

Submit Gmail feedback View package source

Connect Gmail 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.

Gmail MCP Config for LangChain

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Gmail 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.

Gmail Tools Visible to LangChain

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

MCP tool	Source function	Type	Description
`integration__gmail__gmail_add_labels`	`gmail.gmail_add_labels`	Write	Add labels to one or more Gmail messages. Provide messageIds (comma-separated) for batch operations.
`integration__gmail__gmail_archive`	`gmail.gmail_archive`	Read	Archive one or more Gmail messages (remove from inbox). Provide messageIds (comma-separated) for batch operations.
`integration__gmail__gmail_create_draft`	`gmail.gmail_create_draft`	Write	Create a draft email in Gmail (not sent).
`integration__gmail__gmail_mark_read`	`gmail.gmail_mark_read`	Write	Mark one or more Gmail messages as read. Provide messageIds (comma-separated) for batch operations.
`integration__gmail__gmail_mark_unread`	`gmail.gmail_mark_unread`	Write	Mark one or more Gmail messages as unread. Provide messageIds (comma-separated) for batch operations.
`integration__gmail__gmail_read`	`gmail.gmail_read`	Read	Read the full content of a Gmail message by its ID. Returns headers (From, To, Subject, Date), the decoded text body, and a list of attachments. Use gmail_search first to find message IDs, then use this tool to read the full content.
`integration__gmail__gmail_remove_labels`	`gmail.gmail_remove_labels`	Write	Remove labels from one or more Gmail messages. Provide messageIds (comma-separated) for batch operations.
`integration__gmail__gmail_reply`	`gmail.gmail_reply`	Read	Reply to an existing Gmail message (maintains the thread).
`integration__gmail__gmail_count_by_sender`	`gmail.gmail_count_by_sender`	Read	Count all matching Gmail messages grouped by sender. Automatically paginates through ALL results (handles thousands of messages). Returns top senders sorted by count. Use for questions like "who sends me the most email?" or "count unread by sender".
`integration__gmail__gmail_list_labels`	`gmail.gmail_list_labels`	Read	List all labels in the Gmail mailbox (INBOX, SENT, custom labels, etc.).
`integration__gmail__gmail_save_attachment`	`gmail.gmail_save_attachment`	Read	Download an email attachment and save it to workspace files. Requires a messageId and attachmentId (both returned by gmail_read). The file is saved under the agent's folder and can be browsed in the Files page.
`integration__gmail__gmail_search_emails`	`gmail.gmail_search_emails`	Read	Search Gmail messages using Gmail query syntax (e.g., "from:alice subject:meeting is:unread has:attachment after:2026-02-01"). Returns message summaries with headers. Max 100 per page.
`integration__gmail__gmail_send_draft`	`gmail.gmail_send_draft`	Write	Send a previously created Gmail draft by its ID.
`integration__gmail__gmail_send_email`	`gmail.gmail_send_email`	Write	Send an email directly via Gmail.
`integration__gmail__gmail_trash`	`gmail.gmail_trash`	Read	Move one or more Gmail messages to trash. Provide messageIds (comma-separated) for batch operations.
`integration__gmail__gmail_untrash`	`gmail.gmail_untrash`	Read	Remove one or more Gmail messages from trash. Provide messageIds (comma-separated) for batch operations.

Related Gmail Pages

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