Warm MCP for Codex CLI

Ask Codex CLI about your money

Ask OpenAI Codex CLI about your spending, accounts, and subscriptions. Get real answers from your actual financial data via MCP.

Install Warm MCP See pricing

Local @warmio/mcp package · Read-only tools · Scoped API keys · Revoke anytime

Local package

Start the local Warm MCP installer, then connect the client with your scoped API key.

Terminal shell 
npx @warmio/mcp
  • Read-only MCP tools
  • Scoped Warm API key
  • Revocable from Settings

Client config

The client launches @warmio/mcp locally. Warm does not require a hosted remote MCP endpoint.

.codex/config.json json 
{
  "mcpServers": {
    "warm": {
      "command": "npx",
      "args": ["-y", "@warmio/mcp", "--server"],
      "env": {
        "WARM_API_KEY": "your-api-key"
      }
    }
  }
}

MCP setup

Setup in seconds.

Add this to your Codex CLI configuration file.

  1. 1. Create an API key Get it from Settings → API Keys.
  2. 2. Run the installer Use npx @warmio/mcp.
  3. 3. Reload the client Restart or reload so the Warm tools are discovered.
  4. 4. Verify with a prompt Ask: "Is my Warm connection working?"
Terminal shell 
npx @warmio/mcp
Manual config

Use this only if you prefer editing the client config yourself.

.codex/config.json json 
{
  "mcpServers": {
    "warm": {
      "command": "npx",
      "args": ["-y", "@warmio/mcp", "--server"],
      "env": {
        "WARM_API_KEY": "your-api-key"
      }
    }
  }
}

Verify: ask the client to show your Warm accounts or test the Warm connection. It should call get_accounts, get_transactions, get_financial_state, or verify_key.

MCP Tools available.

Codex CLI automatically discovers and uses these tools.

get_accounts

List connected financial accounts with balances, types, and institutions

"Show my connected accounts and current balances"

get_financial_state

Read snapshots, recurring payments, budgets, goals, and health in one bundle

"Show my recurring charges, budgets, goals, and net worth"

get_transactions

Read transaction history with strict cursor pagination

"What did I spend on food last month?"

verify_key

Check if your Warm API key is valid and working

"Is my Warm connection working?"

Ask Codex anything.

Real examples of what you can do with your financial data.

Account Overview

"Show me all my bank accounts and their balances"

Codex uses get_accounts to read your account names, types, institutions, and current balances.

Spending Analysis

"How much did I spend on restaurants last month?"

Codex uses get_transactions to page through transaction history, categorize spending, and give you totals with merchant breakdowns.

Subscription Audit

"What recurring charges am I paying?"

Codex uses get_financial_state to review your recurring charges and subscription totals alongside the rest of your financial state.

Net Worth Tracking

"What's my net worth trend over the past 6 months?"

Codex uses get_financial_state to review your snapshots and net worth trend alongside the rest of your financial state.

What Codex can see.

Available via MCP

  • Accounts (names, types, balances, institutions)
  • Transactions (amounts, merchants, categories, dates)
  • Recurring payments and subscriptions
  • Net worth snapshots over time
  • Budgets, goals, financial health, liabilities, and holdings

Not Exposed (App Only)

  • — Conversation history
  • — Household sharing settings
  • — API key management
  • — Any write operations

Safe and secure.

Your financial data stays protected.

Read-Only Access

The MCP server can only query data—never modify, delete, or transfer.

Scoped API Keys

Your key only accesses your accounts. Nothing else.

Instant Revocation

Delete your API key in Settings and access stops immediately.

Common questions

Everything you need to know about Codex CLI and Warm.

How do I add Warm to Codex CLI?

Create a .codex/config.json file in your project or home directory with the MCP server config. Set the command to "npx", args to ["-y", "@warmio/mcp", "--server"], and add your WARM_API_KEY from Settings → API Keys. Codex will automatically discover the tools.

What financial data can Codex access?

Codex can access your accounts (balances, types, institutions), transactions (amounts, merchants, categories, dates), and financial state: snapshots, recurring payments, budgets, goals, financial health, liabilities, investment holdings, and category spending. Conversation history and household/sharing settings remain app-only.

Is this safe? Can Codex modify my data?

The MCP server is strictly read-only. Codex cannot modify, delete, or transfer any data. Your API key is scoped to only your accounts, and you can revoke it instantly from Settings if needed.

Does Codex CLI support MCP?

Yes. OpenAI Codex CLI supports MCP servers through its config file. The Warm MCP server works just like any other MCP integration—Codex auto-discovers and uses the available tools.

Do I need to install anything?

You need Node.js 18+ installed. The MCP server runs via npx @warmio/mcp, so there's no global installation required. Just add the config and your API key.

Which plan includes this?

MCP is available on paid Warm plans. Pro supports up to 30 synced accounts.

More Ways to Connect

Claude Code Integration → Cursor Integration → Windsurf Integration → Full Documentation →

Ready to ask Codex CLI
about your money?

Your financial data, accessible in your AI terminal workflow.

See pricing View Documentation

MCP is available on paid Warm plans. Pro supports up to 30 synced accounts.