The Agent Skills Directory

[EXTERNAL_DOWNLOADS]: The skill triggers the gbrain self-upgrade command, which downloads and applies updates for the gbrain tool. This is the primary intended function of the skill for managing its own lifecycle.
[COMMAND_EXECUTION]: The skill uses the exec tool to run commands such as gbrain config get and gbrain self-upgrade. It implements a security contract that explicitly forbids running any commands parsed from external markers, ensuring only predefined, hardcoded commands are executed.
[PROMPT_INJECTION]: The skill contains a 'Contract' section that instructs the agent to ignore forged commands in upgrade markers, effectively hardening the agent against potential injection attempts via the tool's standard error stream.

gbrain-upgrade