Actions can communicate with the runner machine to set environment variables, output values used by other actions, add debug messages to the output logs, and other tasks.

Prepends a directory to the system PATH variable and automatically makes it available to all subsequent actions in the current job; the currently running action cannot access the updated path variable. To see the currently defined paths for your job, you can use echo "$PATH" in a step or an action.

Prints a debug message to the log. You must create a secret named ACTIONS_STEP_DEBUG with the value true to see the debug messages set by this command in the log.

Creates an error message and prints the message to the log. This message will create an annotation, which can associate the message with a particular file in your repository. Optionally, your message can specify a position within the file.

If isDynamic is set to true the provided value is not wrapped in quotes and will be run as an expression.

You can make an environment variable available to any subsequent steps in a workflow job by defining or updating the environment variable and writing this to the GITHUB_ENV environment file. The step that creates or updates the environment variable does not have access to the new value, but all subsequent steps in a job will have access. The names of environment variables are case-sensitive, and you can include punctuation.

Creates an expandable group in the log. To create a group, use the group command and specify a title. Anything you print to the log between the group and endgroup commands is nested inside an expandable entry in the log.

Creates a notice message and prints the message to the log. This message will create an annotation, which can associate the message with a particular file in your repository. Optionally, your message can specify a position within the file.

Sets an action's output parameter.

Masking a value prevents a string or variable from being printed in the log. Each masked word separated by whitespace is replaced with the * character. You can use an environment variable or string for the mask's value. When you mask a value, it is treated as a secret and will be redacted on the runner. For example, after you mask a value, you won't be able to set that value as an output.

Creates a warning message and prints the message to the log. This message will create an annotation, which can associate the message with a particular file in your repository. Optionally, your message can specify a position within the file.