A2a Cancel

Process

1. Parse $ARGUMENTS:

   • First token: URL_OR_ALIAS
   • Second token: TASK_ID

   If either is missing, output:

   Usage: /a2a-cancel <url-or-alias> <task-id>
   

2. Check that a2a is installed before proceeding:

   if ! command -v a2a &>/dev/null; then
     echo "Error: 'a2a' CLI not found. Install with:"
     echo "  go install github.com/a2aproject/a2a-go/v2/cmd/a2a@latest"
     exit 1
   fi
   

3. Resolve the URL and auth, then cancel the task:

   URL=$(python3 "${CLAUDE_PLUGIN_ROOT}/scripts/a2a-helper.py" resolve "$URL_OR_ALIAS")
   AUTH_ARGS=()
   while IFS= read -r line; do
     AUTH_ARGS+=("$line")
   done < <(python3 "${CLAUDE_PLUGIN_ROOT}/scripts/a2a-helper.py" auth "$URL")
   a2a cancel "$URL" "$TASK_ID" "${AUTH_ARGS[@]}"
   

4. Update session tracking after cancellation:

   python3 "${CLAUDE_PLUGIN_ROOT}/scripts/a2a-helper.py" session update "$TASK_ID" "canceled"
   

5. Report the result: Show the updated task state returned by the CLI. If the task was already in a terminal state, report that cancellation was not needed.