> ## Documentation Index > Fetch the complete documentation index at: https://bazel.build/llms.txt > Use this file to discover all available pages before exploring further. # template_ctx A context object that is passed to the action template expansion function. ## Members * [args](#args) * [declare\_file](#declare_file) * [run](#run)

args

``` Args template_ctx.args() ``` Returns an Args object that can be used to build memory-efficient command lines.

declare\_file

``` File template_ctx.declare_file(filename, *, directory) ``` Declares that implementation creates a file with the given filename within the specified directory. Remember that in addition to declaring a file, you must separately create an action that emits the file. Creating that action will require passing the returned `File` object to the action's construction function. ### Parameters | Parameter | Description | | - | - | | `filename` | [string](../core/string); required The relative path of the file within the directory. | | `directory` | [File](../builtins/File); required The directory in which the file should be created. |

run

``` None template_ctx.run(*, outputs, inputs=[], executable, tools=None, arguments=[], progress_message=None) ``` Creates an action that runs an executable. ### Parameters | Parameter | Description | | - | - | | `outputs` | [sequence](../core/list) of [File](../builtins/File)s; required List of the output files of the action. | | `inputs` | [sequence](../core/list) of [File](../builtins/File)s; or [depset](../builtins/depset); default is `[]` List or depset of the input files of the action. | | `executable` | [File](../builtins/File); or [string](../core/string); or [FilesToRunProvider](../providers/FilesToRunProvider); required The executable file to be called by the action. | | `tools` | sequence; or depset; or `None`; default is `None`
List or `depset` of any tools needed by the action. Tools are executable inputs that may have their own runfiles which are automatically made available to the action.

When a list is provided, it can be a heterogenous collection of:

`File`s from `ctx.executable` and `FilesToRunProvider`s which are directly in the list will have their runfiles automatically added. All tools are implicitly added as inputs.

| | `arguments` | [sequence](../core/list); default is `[]` Command line arguments of the action. Must be a list of strings or [`actions.args()`](#args) objects. | | `progress_message` | [string](../core/string); or `None`; default is `None` Progress message to show to the user during the build. | This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.