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LLMGRAPH for Codex

Add the LLMGRAPH MCP server to Codex on Windows: the config file, the cmd /c npx form, and how to check it connected.

On this page1 · Add the server to Codex 2 · Check that it connected 3 · Sign in once 4 · Make sure Codex uses it 5 · The five questions Other agents

Add LLMGRAPH to Codex with one command or one entry in config.toml; if Codex cannot start npx on Windows, use cmd /c npx -y llmgraph-mcp. This guide follows Codex's own docs and is not yet tested by us.

1Add the server to Codex

Add from the vendor's docs, not yet tested by us ~/.codex/config.toml, or .codex/config.toml in a trusted project

$codex mcp add llmgraph -- npx -y llmgraph-mcp

Or in the config file:

toml

[mcp_servers.llmgraph]
command = "npx"
args = ["-y", "llmgraph-mcp"]

Codex's own docs do not mention a cmd /c wrapper on Windows. If it cannot start npx, use cmd /c npx -y llmgraph-mcp.

2Check that it connected

Check from the vendor's docs, not yet tested by us (your agent lists them as tools)

Run codex mcp list.
In the codex terminal UI, type /mcp to see active MCP servers.

The first time your agent asks a question, LLMGRAPH answers with a sign-in link and a 6-character code. In a terminal you can run this instead:

$npx -y llmgraph-mcp login

The link works for 10 minutes. Open the full link, including everything after the #, sign in with Google, compare the code on the page with the one your agent shows, and approve this device. Approving your first device starts your 7-day trial. The full steps are in Set up with your agent.

4Make sure Codex uses it

Adding a server doesn't make an agent use it.

Add a line to your agent's instructions file, AGENTS.md:

AGENTS.md

Before changing code, ask the llmgraph MCP tools who_calls and what_breaks_if_changed; after editing, run check_my_changes; read each answer's label and its lines about what it cannot see.

We can't promise that an agent asks on its own. Every answer starts with llmgraph · : look for it where Codex shows what it asked.

5The five questions

Question	What it answers
who_calls	Every place that calls this function, plus calls we can't see.
what_breaks_if_changed	Everything that depends on this, directly or indirectly, and what we can't see.
check_my_changes	After editing: callers you didn't update, and anything we can't see.
what_is_unknown	Where our view is blind (dynamic calls, unknown types, unreadable files) and why.
explain	Why we said this: the evidence behind one answer line.

Other agents

LLMGRAPH for Claude Code: MCP setup on Windows.
LLMGRAPH for Cursor: MCP setup on Windows.
LLMGRAPH for Gemini CLI: MCP setup on Windows.
LLMGRAPH for Antigravity: MCP setup on Windows.
LLMGRAPH for OpenCode: MCP setup on Windows.
LLMGRAPH for Windsurf: MCP setup on Windows.

Set up with your agentEvery agent on one page, plus the sign-in steps and what to do when something goes wrong.The MCP serverWhat the server answers and what it needs.Questions and answersShort answers to common questions.

For agentsthis page as Markdown/docs/agents/codex.mdllms.txt