> For the complete documentation index, see [llms.txt](https://cyr1en.gitbook.io/commandprompter/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://cyr1en.gitbook.io/commandprompter/configuration/command-prompter-configuration/syntax.md).

# Syntax

The `Syntax` section in `config.yml` controls prompt delimiters and post-action template placeholders:

```yaml
Syntax:
  Prompt:
    Open: '<'
    Close: '>'
  Template:
    Open: '{'
    Close: '}'
    Transform-Separator: ':'
    Escape: '\'
```

With these defaults, `<a:Name>` is a prompt tag, `{0}` is the first answer in a post-action template, `{0:upper}` applies a transformer, and `\{` inserts a literal template opener.

`Argument-Regex` remains as a deprecated compatibility setting for prompt delimiters. When `Syntax.Prompt` still has its defaults and `Argument-Regex` was customized, CommandPrompter derives the effective opening and closing characters from the legacy value. Prefer `Syntax.Prompt` for new configuration.

Each syntax token must be nonempty, no more than 16 characters, and contain no whitespace, control characters, or quotes. Tokens cannot be equal or overlap by prefix. A conflicting syntax configuration rejects reload and leaves the previous validated parser active.

Changing template delimiters also changes placeholders and transformers in trusted definitions such as `presets.json`. Keep the configured syntax consistent anywhere commands are authored.


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