genify

MCP tool for AI coding agents to safely plan, diff, and apply structured file changes inside a project root.

Use genify for repeatable codebase edits: writing files, replacing text, inserting blocks around markers, moving/copying/deleting paths, creating directories, changing modes, and generating dry-run diffs before applying changes.

Turn one file into a complete project

The main idea is to have a single source file that can be used to generate or update a full project structure quickly and consistently using different configuration files.

There are three modes:

• CLI interactive mode – for manual use and quick input.
• Code mode – for automated and configurable project generation.
• MCP server mode – for AI coding agents that call structured tools over STDIO.

Features:

• Create files from templates based on config.
• Replace content using regular expressions.
• Append or prepend content to existing files.
• Easily update multiple projects using shared configs.

Installation

Cargo

• Install the rust toolchain in order to have cargo installed by following this guide.
• run

  cargo install genify --features cli
  

Get Started

CLI

Turn one file into a complete project

Usage: genify [OPTIONS] [PATH]
       genify <COMMAND>

Arguments:
  [PATH]  Path to a config file or http(s) URL

Options:
  -p, --props-json <JSON>  Override props using a JSON object (Array/Map supported)
  -n, --no-interaction     Do not ask any interactive question
  -h, --help               Print help
  -V, --version            Print version

Commands:
  mcp   Start genify as an MCP server over STDIO
  help  Print this message or the help of the given subcommand(s)

example.toml

[props]
value = "value"
dir = "tmp"
val = "val"
other = "{{ val }}"
override = "1"

[[rules]]
type = "write"
path = "{{ dir }}/some.txt"  # if the file exists will be error
content = "{{ val }} {{ value }} {{ other | pascal_case }} {{ override }} - should be replaced"
if_exists = "error"

[[rules]]
type = "replace"
path = "{{ dir }}/some.txt"
replace = "should.*replaced"
content = "replaced {{ value }}"

[[rules]]
type = "prepend"
path = "{{ dir }}/some.txt"
content = "prepend {{ value }}"

[[rules]]
type = "append"
path = "{{ dir }}/some.txt"
content = "append {{ value }}"

genify example.toml

Override props from the CLI (including Array/Map) using JSON:

genify example.toml --props-json '{"tags": ["cli", "json"], "meta": {"license": "MIT"}}'

tmp/some.txt

prepend value
val value Val 1 - replaced value
append value

MCP

Run genify as an MCP server using the standard STDIO transport:

genify mcp --root .

For read-only agent sessions:

genify mcp --root . --read-only

Example Codex configuration:

[mcp_servers.genify]
command = "genify"
args = ["mcp", "--root", "."]

The MCP server writes protocol messages only to stdout; logs and diagnostics go to stderr. All filesystem access is constrained to --root.

Available tools:

genify_plan, genify_diff, and genify_apply accept the config directly as JSON in MCP tool arguments. No temporary TOML config or template file is required.

{
  "config": {
    "rules": [
      {
        "type": "replace",
        "path": "src/application.rs",
        "replace": "old text",
        "content": "new text"
      }
    ]
  },
  "root": "."
}

Supported rule types:

replace is strict by default: when replace_all is false or omitted, it fails unless the regex match count equals expected_matches, which defaults to 1.

Supported rule examples:

{
  "config": {
    "rules": [
      {
        "type": "write",
        "path": "new/file.rs",
        "content": "...",
        "if_exists": "error"
      }
    ]
  }
}

{
  "config": {
    "rules": [
      {
        "type": "append_once",
        "path": "README.md",
        "content": "..."
      }
    ]
  }
}

{
  "config": {
    "rules": [
      {
        "type": "managed_block",
        "path": "README.md",
        "start_marker": "<!-- genify:start -->",
        "end_marker": "<!-- genify:end -->",
        "content": "..."
      }
    ]
  }
}

{
  "config": {
    "rules": [
      {
        "type": "insert_after",
        "path": "README.md",
        "marker": "## Usage",
        "content": "..."
      }
    ]
  }
}

{
  "config": {
    "rules": [
      {
        "type": "move",
        "from": "old/file.rs",
        "to": "new/file.rs"
      }
    ]
  }
}

genify_validate_config returns a structured hint.minimal_config and per-operation examples when the config is missing or invalid.

Supported Variable Types

Note: For Array and Map, enter JSON when prompted or provide them up front with --props-json.

Code

fn main() {
    genify::generate(
        Path::new("."),
        &genify::parse_toml(
            fs::read_to_string("example.toml")
                .unwrap()
                .as_str(),
        )
        .expect("The config should be valid"),
        Some(vec![(
            "value".to_string(),
            genify::Value::String("val".to_string()),
        )]),
    )
    .expect("The generation should be successful");
}

License

• MIT LICENSE

Contribution

CONTRIBUTING.md