Cancels an active A2A task. Resolves aliases and auth params from settings, updates session tracking.
$npx -y skills add christophe1997/agent-extentions --skill a2a-cancelInstalls into the current project.
Run `npx skills use "https://github.com/christophe1997/agent-extentions" --skill "christophe1997/agent-extentions/a2a-cancel"` and follow the generated skill instructions now. Read its complete output, redirecting it to a temporary file first if necessary. Resolve relative paths from the supporting-files directory it provides.
Use the skills in "https://github.com/christophe1997/agent-extentions" that are relevant to the current task. Run `npx skills add "https://github.com/christophe1997/agent-extentions"` and select the relevant skills, then follow their instructions.