Can I use Matrix as a CLI?

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

Can I expose Matrix through MCP?

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

Where are Matrix credentials stored?

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

Can I deny write access for Matrix MCP tools?

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

communication

Matrix MCP Integration for Codex

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

7 functions 5 read 2 write Bearer token auth

Submit Matrix feedback View package source

Connect Matrix to Codex

Use KosmoKrator as a local MCP proxy for Codex so coding sessions can reach selected integrations with explicit write policy.

Register kosmo mcp:serve as a local stdio server and choose the integration allowlist. The gateway is local, scoped to this integration, and starts with --write=deny so Codex can inspect read-capable tools without receiving write access by default.

Matrix MCP Config for Codex

Keep write access denied or ask-based unless the workspace is trusted.

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

Run the Gateway Manually

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

Why Use KosmoKrator Here

Scoped tools

Expose only Matrix 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.

Matrix Tools Visible to Codex

Codex sees stable MCP tool names generated from the Matrix integration catalog.

MCP tool	Source function	Type	Description
`integration__matrix__matrix_list_rooms`	`matrix.matrix_list_rooms`	Read	List rooms the authenticated user has joined on Matrix. Returns room IDs, names, and aliases.
`integration__matrix__matrix_get_room`	`matrix.matrix_get_room`	Read	Get details of a specific Matrix room, including name, topic, members, and aliases.
`integration__matrix__matrix_create_room`	`matrix.matrix_create_room`	Write	Create a new room on the Matrix homeserver. Returns the newly created room ID.
`integration__matrix__matrix_send_message`	`matrix.matrix_send_message`	Write	Send a text message to a Matrix room. Uses a unique transaction ID to prevent duplicate messages.
`integration__matrix__matrix_list_members`	`matrix.matrix_list_members`	Read	List members of a Matrix room. Returns user IDs, display names, and avatar URLs.
`integration__matrix__matrix_get_profile`	`matrix.matrix_get_profile`	Read	Get a Matrix user's profile information, including display name and avatar URL.
`integration__matrix__matrix_get_current_user`	`matrix.matrix_get_current_user`	Read	Get the currently authenticated Matrix user's information, including user ID and device ID.

Related Matrix Pages

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