Codex Integration

How to connect OpenAI Codex and Codex CLI with Siglata's hosted MCP tools and file catalog.

Codex integrates with Siglata through the official @siglata Agent Plugin and Model Context Protocol (MCP) server.

Installation

Start the supported Siglata installer:

siglata install

Or configure Codex’s tool discovery file directly:

{
  "plugins": ["@siglata/files"],
  "mcp": {
    "siglata": {
      "type": "streamable-http",
      "url": "https://www.siglata.com/v1/mcp",
      "headers": {
        "Authorization": "Bearer ${SIGLATA_API_KEY}"
      }
    }
  }
}

How Codex Interacts with Siglata

1. Context Initialization: Codex calls context to verify organization permissions and limits.
2. File Downloads & Ingestion: When files or spreadsheets are passed to Codex, Codex passes the download URL; Siglata fetches, computes SHA-256 checksums, and safely binds bytes into the vault.
3. Transactional Execution: Codex plans edits using execute({ mode: "plan" }), reviews the mutation digest, and commits with execute({ mode: "apply" }).

Example Prompt

Use Siglata to inspect our Q3 Revenue spreadsheet, calculate the total across all regional sheets, and add a summary row.