Connect Claude Code and Codex

Claude Code and Codex can use GoModel as one authenticated MCP endpoint. They receive the tools that GoModel exposes, while credentials for Linear, GitHub, and other upstream MCP servers remain in GoModel. Claude Code or Codex -> GoModel /mcp -> upstream MCP servers

Before you start

You need:

A running GoModel deployment that the client can reach.
At least one connected MCP server in the GoModel dashboard or configuration.
A GoModel master key or managed auth key allowed to see that server.

Set the client credential in your shell:

export GOMODEL_API_KEY="sk-your-gomodel-key"

Use HTTPS for a remote deployment. For a local GoModel process, replace the example URL with http://localhost:8080/mcp.

Send only the GoModel key from the client. Configure upstream tokens, such as a Linear API key, in GoModel’s MCP server settings instead.

Choose an endpoint

Endpoint	Catalog exposed to the client
`https://gomodel.example.com/mcp`	Every server visible to the key, with names such as `linear_create_issue`
`https://gomodel.example.com/mcp/linear`	Only Linear, with its original tool names
`https://gomodel.example.com/mcp/github`	Only GitHub, with its original tool names

The aggregated /mcp endpoint is the usual choice. A per-server endpoint is useful when one agent should receive a smaller catalog.

Claude Code

Add GoModel as a user-scoped Streamable HTTP server:

claude mcp add \
  --transport http \
  --scope user \
  gomodel \
  https://gomodel.example.com/mcp \
  --header "Authorization: Bearer ${GOMODEL_API_KEY}"

Check the saved connection:

claude mcp list
claude mcp get gomodel

Start Claude Code and enter /mcp to inspect the connection and available tools.

Keep the key out of a shared file

For project-scoped setup, create .mcp.json in the project root. Claude Code expands environment variables in URLs and headers:

{
  "mcpServers": {
    "gomodel": {
      "type": "http",
      "url": "https://gomodel.example.com/mcp",
      "headers": {
        "Authorization": "Bearer ${GOMODEL_API_KEY}"
      }
    }
  }
}

The file can be shared without the key. Each user exports GOMODEL_API_KEY locally and approves the project MCP server when Claude Code prompts them. See the official Claude Code MCP documentation for configuration scopes and additional management commands.

Codex

Codex can read the bearer token from an environment variable without storing its value in the MCP configuration:

codex mcp add gomodel \
  --url https://gomodel.example.com/mcp \
  --bearer-token-env-var GOMODEL_API_KEY

Check the saved connection:

codex mcp list

Start Codex and enter /mcp to inspect the server and its tools. The Codex CLI and IDE extension share this MCP configuration. The equivalent ~/.codex/config.toml entry is:

[mcp_servers.gomodel]
url = "https://gomodel.example.com/mcp"
bearer_token_env_var = "GOMODEL_API_KEY"

See the official Codex MCP documentation for approval policies, tool filters, and project-scoped configuration.

Limit the aggregated catalog

To keep the /mcp URL while selecting a subset of upstream servers, send an X-MCP-Servers header with comma-separated server slugs. For Claude Code, add it beside Authorization in .mcp.json:

"headers": {
  "Authorization": "Bearer ${GOMODEL_API_KEY}",
  "X-MCP-Servers": "linear,github"
}

For Codex, add a static header:

[mcp_servers.gomodel]
url = "https://gomodel.example.com/mcp"
bearer_token_env_var = "GOMODEL_API_KEY"
http_headers = { "X-MCP-Servers" = "linear,github" }

Unknown slugs in X-MCP-Servers are ignored. GoModel still applies the auth key’s user_path visibility and each server’s allowed/disallowed tool filters.

Troubleshooting

Symptom	What to check
`401 Unauthorized`	`GOMODEL_API_KEY` is exported and contains a valid GoModel key
Connected with no tools	The key’s `user_path`, the server’s visibility settings, and allowed/disallowed tool filters
Server is degraded	Open its catalog in the dashboard, inspect the last error, then use Reconnect
Works locally but not remotely	The public URL, TLS certificate, firewall, and reverse-proxy forwarding for `/mcp`

GoModel uses bearer authentication rather than an interactive OAuth flow for its downstream MCP endpoint. Do not run codex mcp login gomodel; configure the bearer token as shown above. For proxy behavior, upstream configuration, lifecycle, and security details, see MCP Gateway.

​Before you start

​Choose an endpoint

​Claude Code

​Keep the key out of a shared file

​Codex

​Limit the aggregated catalog

​Troubleshooting

Before you start

Choose an endpoint

Claude Code

Keep the key out of a shared file

Codex

Limit the aggregated catalog

Troubleshooting