Configuration Reference

App creation

`CoreReplApp.Create()`

Creates a lightweight app with no DI container. Use when you don’t need dependency injection.

var app = CoreReplApp.Create()
    .WithDescription("My app description")
    .WithBanner("Welcome message shown in REPL mode");

`ReplApp.Create()`

Creates an app with a default DI container (Microsoft.Extensions.DependencyInjection).

var app = ReplApp.Create().UseDefaultInteractive();

Pass a service configuration delegate to ReplApp.Create() to register services before the app runs:

var app = ReplApp.Create(services =>
{
    services.AddSingleton<IMyService, MyService>();
}).UseDefaultInteractive();

Profiles

`UseDefaultInteractive()`

Activates interactive REPL mode when no arguments are passed. This is the standard starting point for most apps.

`UseCliProfile()`

Disables the interactive REPL. The app only runs in one-shot CLI mode.

`UseEmbeddedConsoleProfile()`

For apps embedded in a larger host — no entry-point management, just command dispatching.

Route registration

`Map(route, handler)`

app.Map("greet {name}", (string name) => $"Hello, {name}!");

Route parameters: {name}, {id:int}, {email:email}, {token:guid}, etc.
Handler can be a delegate, method group, or lambda.
Parameters are bound from route segments + DI.

`Context(segment, configure)`

app.Context("admin", admin =>
{
    admin.Map("list-users", ...);
});

Fluent modifiers on routes

Method	Effect
`.WithDescription("...")`	Sets the command description shown in help
`.Destructive()` / `.ReadOnly()` / `.Idempotent()`	MCP behavioral annotations
`.AutomationHidden()`	Hides from MCP agents; visible in interactive REPL
`.AsResource()`	Registers as an MCP resource (URI derived from route)
`.AsPrompt()`	Registers as an MCP prompt template
`.AsMcpAppResource()`	Registers as an MCP Apps UI resource
`.WithCompletion(provider)`	Registers Tab completion for this route

Parameters

Route constraints

Constraint	.NET type
`{x:int}`	`int`
`{x:long}`	`long`
`{x:double}`	`double`
`{x:bool}`	`bool`
`{x:guid}`	`Guid`
`{x:email}`	`string` (validated)
`{x:date}` / `{x:dateonly}`	`DateOnly`
`{x:datetime}` / `{x:date-time}`	`DateTime`
`{x:datetimeoffset}` / `{x:date-time-offset}`	`DateTimeOffset`
`{x:time}` / `{x:timeonly}`	`TimeOnly`
`{x:timespan}` / `{x:time-span}`	`TimeSpan`

Types are also inferred from the handler parameter type, so :int is implicit when the parameter is int id. For all accepted input formats, see Built-in Types & Formats.

Options groups

[ReplOptionsGroup]
public class PagingOptions
{
    [ReplOption(Aliases = ["--limit"])]
    public int Limit { get; init; } = 20;

    [ReplOption(Aliases = ["--sort"])]
    public string Sort { get; init; } = "name";
}

Handlers that accept PagingOptions receive all flags in the group. Avoid names already reserved by Repl: --format, --json, --xml, --yaml, --markdown, --no-logo, --help, --interactive, --no-interactive, --output, and --answer:*.

Temporal ranges

Three range types, one per precision level:

Type	Precision	Duration constraint
`ReplDateRange`	`DateOnly`	Whole days only
`ReplDateTimeRange`	`DateTime`	Any duration
`ReplDateTimeOffsetRange`	`DateTimeOffset`	Any duration

Both start..end and start@duration forms are accepted. See Built-in Types & Formats for all format details.

Interactive options

Flag (CLI)	Effect
`--json`	Output as JSON
`--xml`	Output as XML
`--yaml`	Output as YAML
`--markdown`	Output as Markdown table
`--help`	Show help for this route
`--help --json`	Machine-readable help
`--answer:N=value`	Pre-fill the Nth interactive prompt