KosmoKrator

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Mastodon MCP Integration for LangChain

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

6 functions 5 read 1 write Bearer token auth
Submit Mastodon feedback View package source

Connect Mastodon 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.

Mastodon MCP Config for LangChain

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

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Mastodon 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.

Mastodon Tools Visible to LangChain

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

MCP toolSource functionTypeDescription
integration__mastodon__mastodon_list_statuses mastodon.mastodon_list_statuses Read Browse statuses (toots) from a Mastodon timeline. Use "home" for your home feed, "public" for the federated timeline, or "local" for the local instance timeline. Supports pagination.
integration__mastodon__mastodon_get_status mastodon.mastodon_get_status Read Retrieve a single Mastodon status (toot) by its ID. Returns the full post content, author details, and engagement metrics.
integration__mastodon__mastodon_create_status mastodon.mastodon_create_status Write Publish a new status (toot) on Mastodon. Supports content warnings, visibility controls (public, unlisted, private, direct), replies, and language settings.
integration__mastodon__mastodon_list_accounts mastodon.mastodon_list_accounts Read List followers of a Mastodon account. Returns account profiles with display names, bios, and follower counts. Supports pagination.
integration__mastodon__mastodon_get_account mastodon.mastodon_get_account Read Retrieve a Mastodon account profile by ID. Returns display name, bio, follower counts, and other profile details.
integration__mastodon__mastodon_get_current_user mastodon.mastodon_get_current_user Read Get the authenticated user's Mastodon profile. Returns display name, bio, follower/following counts, and other account details.

Related Mastodon Pages

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