How to connect Heroku to Codex

1. 1. Enable Heroku in Metorial

   In your Metorial portal, enable the Heroku MCP server and sign in with the account that owns the data. Access stays governed by your team policies.

2. 2. Add the server and sign in

   The Codex CLI, IDE extension and ChatGPT desktop app share this config.

   Copy

   codex mcp add metorial --url <your-magic-mcp-url>
   codex mcp login metorial

3. 3. Check the connection

   Type /mcp in Codex to see Metorial and its Heroku tools.

• Scale Formation: View or scale dyno formations for a Heroku app.
• Manage Collaborators: List, add, or remove collaborators who have access to a Heroku app.
• List Apps: List all Heroku applications accessible to the authenticated user.
• Get Account: Retrieve the authenticated user's Heroku account details including email, verification status, and two-factor authentication status.
• Update App: Update a Heroku application's settings.
• Create App: Create a new Heroku application.
• Delete App: Permanently delete a Heroku application.
• Manage Add-ons: List, provision, update, or remove add-on services for a Heroku app.
• Manage Dynos: List running dynos, run one-off dynos, or restart dynos for a Heroku app.
• Manage Log Drains: List, add, or remove log drains for a Heroku app.
• Manage Releases: List releases, get release details, or rollback to a previous release for a Heroku app.
• Get App: Retrieve detailed information about a specific Heroku app by its name or ID.
• Manage Config Vars: Read or update environment configuration variables for a Heroku app.
• Manage Builds: List, get, or create builds for a Heroku app.
• Manage Pipelines: Manage Heroku Pipelines for continuous delivery workflows.
• And 3 more on the Heroku MCP server page.

• Limit which Heroku tools Codex sees with enabled_tools and disabled_tools on the metorial server in config.toml.
• Set default_tools_approval_mode to auto, prompt, writes or approve. writes prompts only for tools that are not marked read-only.
• Type /mcp in the composer to see the connected servers.
• Override the approval behavior for a single Heroku tool with tools.<tool>.approval_mode.

Metorial is listed but tools are missing

Codex can connect without credentials and then see nothing. Run codex mcp login metorial to complete the OAuth sign-in.

Metorial times out at startup

Codex waits 10 seconds by default. Raise startup_timeout_sec under [mcp_servers.metorial] in ~/.codex/config.toml.

Long tool calls fail after a minute

The default tool timeout is 60 seconds. Raise tool_timeout_sec for the metorial server in config.toml.

Based on the Codex MCP documentation.