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codex/docs/config.md
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# Configuration
For basic configuration instructions, see [this documentation](https://developers.openai.com/codex/config-basic).
For advanced configuration instructions, see [this documentation](https://developers.openai.com/codex/config-advanced).
For a full configuration reference, see [this documentation](https://developers.openai.com/codex/config-reference).
## Connecting to MCP servers
Codex can connect to MCP servers configured in `~/.codex/config.toml`. See the configuration reference for the latest MCP server options:
- https://developers.openai.com/codex/config-reference
## Apps (Connectors)
Use `$` in the composer to insert a ChatGPT connector; the popover lists accessible
apps. The `/apps` command lists available and installed apps. Connected apps appear first
and are labeled as connected; others are marked as can be installed.
## Notify
Codex can run a notification hook when the agent finishes a turn. See the configuration reference for the latest notification settings:
- https://developers.openai.com/codex/config-reference
## JSON Schema
The generated JSON Schema for `config.toml` lives at `codex-rs/core/config.schema.json`.
## Variable expansion
Codex expands environment variables in all `config.toml` string values and table keys.
- `$VAR` and `${VAR}` expand to environment variables.
- `$$` escapes to a literal `$`.
- `~` expands only when the string starts with `~/` or `~\\`.
If a variable is unset (including `HOME`/`USERPROFILE` for `~`), the value is left unchanged
and Codex emits a warning after loading the config.
When Codex persists project trust entries, it prefers updating an existing symbolic project key
(for example, `~` or `$HOME`) if it expands to the same directory, instead of adding a duplicate
absolute path entry.
When Codex checks whether a project is trusted, it also expands symbolic project keys (including
the bare `~` and `$VAR` forms) before matching against the current working directory. If both a
symbolic key and its absolute expansion exist for the same directory, Codex prefers the symbolic
entry and may remove the absolute entry when it only contains `trust_level`.
## Notices
Codex stores "do not show again" flags for some UI prompts under the `[notice]` table.
Ctrl+C/Ctrl+D quitting uses a ~1 second double-press hint (`ctrl + c again to quit`).